EVALUATION KIT AVAILABLE MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters General Description Benefits and Features The device employs a peak-current-mode control architecture with a MODE pin that can be used to operate the device in pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes. PWM operation provides constant frequency operation at all loads and is useful in applications sensitive to variable switching frequency. PFM operation disables negative inductor current and additionally skips pulses at light loads for high efficiency. The low-resistance on-chip MOSFETs ensure high efficiency at full load and simplify the PCB layout. Reduces Number of DC-DC Regulators to Stock * Wide 4.5V to 60V Input Voltage Range * Fixed 3.3V and 5V Output Voltage Options * Adjustable 0.9V to 0.89 x VIN Output Voltage Option * Delivers Up to 300mA Load Current * Configurable Between PFM and Forced-PWM Modes Reduces Power Dissipation * Peak Efficiency = 92% * PFM Feature for High Light-Load Efficiency * Shutdown Current = 2.2A (typ) The MAX15062 high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operates over a 4.5V to 60V input voltage range. The converter delivers output current up to 300mA at 3.3V (MAX15062A), 5V (MAX15062B), and adjustable output voltages (MAX15062C). The device operates over the -40C to +125C temperature range and is available in a compact 8-pin (2mm x 2mm) TDFN package. Simulation models are available. To reduce input inrush current, the device offers an internal soft-start. The device also incorporates an EN/ UVLO pin that allows the user to turn on the part at the desired input-voltage level. An open-drain RESET pin can be used for output-voltage monitoring. Applications Process Control Industrial Sensors 4-20mA Current Loops HVAC and Building Control High-Voltage LDO Replacement General-Purpose Point-of-Load Ordering Information appears at end of data sheet. Eliminates External Components and Reduces Total Cost * No Schottky--Synchronous Operation for High Efficiency and Reduced Cost * Internal Compensation * Internal Feedback Divider for Fixed 3.3V, 5V Output Voltages * Internal Soft-Start * All-Ceramic Capacitors, Ultra-Compact Layout Operates Reliably in Adverse Industrial Environments * Hiccup-Mode Current Limit and Autoretry Startup * Built-In Output Voltage Monitoring with Open-Drain RESET Pin * Programmable EN/UVLO Threshold * Monotonic Startup into Prebiased Output * Overtemperature Protection * High Industrial -40C to +125C Ambient Operating Temperature Range/-40C to +150C Junction Temperature Range Typical Operating Circuit VIN 4.5V TO 60V CIN 1F VIN EN/UVLO LX GND MAX15062A CVCC 1F VCC MODE 19-6685; Rev 2; 7/16 RESET VOUT L1 33H COUT 10F VOUT 3.3V, 300mA MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters Absolute Maximum Ratings VIN to GND...............................................................-0.3V to 70V EN/UVLO to GND....................................................-0.3V to 70V LX to GND..................................................... -0.3V to VIN + 0.3V VCC, FB/VOUT, RESET to GND................................-0.3V to 6V MODE to GND..............................................-0.3V to VCC + 0.3V LX total RMS Current......................................................800mA Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (TA = +70C) 8-Pin TDFN (derate 6.2mW/NC above +70C)............496mW Junction Temperature.......................................................+150C Storage Temperature Range............................. -65C to +150C Soldering Temperature (reflow)........................................+260C Lead Temperature (soldering, 10s).................................. +300C Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Junction temperature greater than +125C degrades operating lifetimes. Package Thermal Characteristics (Note 1) TDFN Junction-to-Ambient Thermal Resistance (JA).......+162C/W Junction-to-Case Thermal Resistance (JC)..............+20C/W Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. Electrical Characteristics (VIN = 24V, VGND = 0V, CIN = CVCC = 1F, VEN/UVLO = 1.5V, LX = MODE = RESET = unconnected; TA = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C. All voltages are referenced to GND, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS INPUT SUPPLY (VIN) Input Voltage Range Input Shutdown Current Input Supply Current VIN 4.5 60 V IIN-SH VEN/UVLO = 0V, shutdown mode 2.2 4 A IQ-PFM MODE = unconnected, FB/VOUT = 1.03 x FB/VOUT-REG 95 160 A IQ-PWM Normal switching mode, VIN = 24V 2.5 4 mA ENABLE/UVLO (EN/UVLO) EN/UVLO Threshold VENR VEN/UVLO rising 1.19 1.215 1.24 VENF VEN/UVLO falling 1.06 1.09 1.15 V +100 nA VEN-TRUESD VEN/UVLO falling, true shutdown EN/UVLO Input Leakage Current IEN/UVLO 0.75 VEN/UVLO = 60V, TA = +25C -100 6V < VIN < 60V, 0mA < IVCC < 10mA 4.75 5 5.25 V 13 30 50 mA 0.15 0.3 V LDO (VCC) VCC Output Voltage Range VCC Current Limit VCC Dropout VCC UVLO www.maximintegrated.com VCC IVCC-MAX VCC = 4.3V, VIN = 12V VCC-DO VIN = 4.5V, IVCC = 5mA VCC-UVR VCC rising 4.05 4.18 4.3 VCC-UVF VCC falling 3.7 3.8 3.95 V Maxim Integrated 2 MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters Electrical Characteristics (continued) (VIN = 24V, VGND = 0V, CIN = CVCC = 1F, VEN/UVLO = 1.5V, LX = MODE = RESET = unconnected; TA = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C. All voltages are referenced to GND, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER MOSFETs High-Side pMOS On-Resistance RDS-ONH ILX = 0.3A (sourcing) TA = +25C Low-Side nMOS On-Resistance RDS-ONL ILX = 0.3A (sinking) TA = +25C LX Leakage Current ILX-LKG 1.35 TA = TJ = +125C 2.7 0.45 TA = TJ = +125C VEN/UVLO = 0V, VIN = 60V, TA = +25C, VLX = (VGND + 1V) to (VIN - 1V) 1.75 0.55 0.9 -1 +1 A ms SOFT-START (SS) Soft-Start Time tSS 3.8 4.1 4.4 MODE = GND, MAX15062C 0.887 0.9 0.913 MODE = unconnected, MAX15062C 0.887 0.915 0.936 MAX15062C -100 -25 MODE = GND, MAX15062A 3.25 3.3 3.35 MODE = unconnected, MAX15062A 3.25 3.35 3.42 MODE = GND, MAX15062B 4.93 5 5.07 MODE = unconnected, MAX15062B 4.93 5.08 5.18 FEEDBACK (FB) FB Regulation Voltage FB Leakage Current VFB-REG IFB V nA OUTPUT VOLTAGE (VOUT) VOUT Regulation Voltage VOUT-REG V CURRENT LIMIT Peak Current-Limit Threshold IPEAK-LIMIT 0.49 0.56 0.62 A Runaway Current-Limit Threshold IRUNAWAY- 0.58 0.66 0.73 A Negative Current-Limit Threshold ISINK-LIMIT 0.25 0.3 0.35 A PFM Current Level LIMIT MODE = GND IPFM 0.01 mA 0.13 A TIMING Switching Frequency fSW 465 Events to Hiccup After Crossing Runaway Current Limit 62.5 Hiccup Timeout Maximum Duty Cycle www.maximintegrated.com 535 1 FB/VOUT Undervoltage Trip Level to Cause Hiccup Minimum On-Time 500 64.5 Cycles 66.5 131 tON-MIN DMAX FB/VOUT = 0.98 x FB/VOUT-REG 89 kHz % ms 90 130 ns 91.5 94 % Maxim Integrated 3 MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters Electrical Characteristics (continued) (VIN = 24V, VGND = 0V, CIN = CVCC = 1F, VEN/UVLO = 1.5V, LX = MODE = RESET = unconnected; TA = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C. All voltages are referenced to GND, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN LX Dead Time TYP MAX 5 UNITS ns RESET FB/VOUT Threshold for RESET Rising FB/VOUT rising 93.5 95.5 97.5 % FB/VOUT Threshold for RESET Falling FB/VOUT falling 90 92 94 % RESET Delay After FB/VOUT Reaches 95% Regulation 2 ms RESET Output Level Low IRESET = 5mA 0.2 V RESET Output Leakage Current VRESET = 5.5V, TA = +25C 0.1 A MODE MODE Internal Pullup Resistor 500 k 166 C 10 C THERMAL SHUTDOWN Thermal-Shutdown Threshold Temperature rising Thermal-Shutdown Hysteresis Note 2: All the limits are 100% tested at TA = +25C. Limits over temperature are guaranteed by design. www.maximintegrated.com Maxim Integrated 4 MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters Typical Operating Characteristics (VIN = 24V, VGND = 0V, CIN = CVCC = 1F, VEN/UVLO = 1.5V, TA = +25C, unless otherwise noted.) 70 VIN = 36V 50 50 FIGURE 5 APPLICATION CIRCUIT, PFM MODE VOUT = 3.3V VIN = 48V 10 1 40 30 100 10 1 LOAD CURRENT (mA) toc02b VIN = 24V 40 EFFICIENCY (%) EFFICIENCY (%) 80 VIN = 36V VIN = 48V VIN = 60V 50 1 FIGURE 8 APPLICATION CIRCUIT, PFM MODE VOUT = 12V 10 70 VIN = 24V 60 VIN = 36V 50 VIN = 48V 40 30 20 10 0 100 0 EFFICIENCY vs. LOAD CURRENT toc04a 50 EFFICIENCY (%) EFFICIENCY (%) VIN = 12V 60 VIN = 24V 50 VIN = 36V 30 VIN = 48V 20 FIGURE 7 APPLICATION CIRCUIT, PWM MODE VOUT = 2.5V 10 0 50 100 150 200 LOAD CURRENT (mA) www.maximintegrated.com 10 200 250 300 250 EFFICIENCY vs. LOAD CURRENT 80 70 60 VIN = 36V 50 VIN = 48V 40 30 20 FIGURE 6 APPLICATION CIRCUIT, PWM MODE VOUT = 5V 10 0 300 0 50 100 150 200 EFFICIENCY VS. LOAD CURRENT OUTPUT VOLTAGE vs. LOAD CURRENT 3.37 toc04b VIN = 18V VIN = 24V 60 VIN = 36V 50 40 VIN = 48V 30 VIN = 60V 20 10 50 100 FIGURE 8 APPLICATION CIRCUIT, PWM MODE VOUT = 12V 150 200 LOAD CURRENT (mA) 250 300 250 300 FIGURE 5 APPLICATION CIRCUIT, PFM MODE 3.36 0 VIN = 12V VIN = 24V LOAD CURRENT (mA) 70 0 100 LOAD CURRENT (mA) 80 70 40 150 FIGURE 7 APPLICATION CIRCUIT, PFM MODE VOUT = 2.5V 90 90 80 0 100 100 VIN = 6V 90 1 100 FIGURE 5 APPLICATION CIRCUIT, PWM MODE VOUT = 3.3V LOAD CURRENT (mA) 100 VIN = 48V LOAD CURRENT (mA) 80 60 50 20 100 VIN = 12V 90 70 VIN = 24V VIN = 36V 30 EFFICIENCY vs. LOAD CURRENT 100 VIN = 18V 90 60 LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT 100 70 40 FIGURE 6 APPLICATION CIRCUIT, PFM MODE VOUT = 5V VIN = 48V EFFICIENCY (%) 30 VIN = 36V 60 80 OUTPUT VOLTAGE (V) 40 70 VIN = 12V 90 MAX15062 toc04 60 80 VIN = 6V 3.35 MAX15062 toc05 EFFICIENCY (%) 80 VIN = 24V 90 EFFICIENCY (%) VIN = 24V VIN = 12V toc02a 100 MAX15062 toc03 90 EFFICIENCY (%) MAX15062 toc01 VIN = 12V EFFICIENCY vs. LOAD CURRENT EFFICIENCY vs. LOAD CURRENT 100 MAX15062 toc02 EFFICIENCY vs. LOAD CURRENT 100 VIN = 12V, 24V 3.34 3.33 VIN = 36V 3.32 VIN = 48V 3.31 3.30 3.29 0 50 100 150 200 250 300 LOAD CURRENT (mA) Maxim Integrated 5 MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters Typical Operating Characteristicsc (continued) (VIN = 24V, VGND = 0V, CIN = CVCC = 1F, VEN/UVLO = 1.5V, TA = +25C, unless otherwise noted.) OUTPUT VOLTAGE vs. LOAD CURRENT 5.04 VIN = 12V, 36V, 48V 5.02 5.00 VIN = 12V 2.51 VIN = 6V,24V 2.50 VIN = 36V VIN = 48V 2.49 2.48 50 100 150 200 0 LOAD CURRENT (mA) 0.920 toc06c OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 100 VIN = 12V VIN = 6V, 24V VIN = 36V VIN = 48V 0.900 50 100 150 200 VIN = 36V 3.299 250 300 3.297 VIN = 24V 0 50 100 VIN = 12V 150 200 250 20 40 60 TEMPERATURE (C) www.maximintegrated.com VIN = 48V,60V 0 50 80 100 120 100 150 200 250 300 OUTPUT VOLTAGE vs. LOAD CURRENT 5.003 FIGURE 6 APPLICATION CIRCUIT, PWM MODE 5.002 5.001 VIN = 48V 5.000 4.999 4.997 300 VIN = 36V VIN = 12V 0 50 100 VIN = 24V 150 200 250 300 LOAD CURRENT (mA) 5.04 OUTPUT VOLTAGE (V) FIGURE 5 APPLICATION CIRCUIT, LOAD = 300mA 0 12.10 4.998 MAX15062 toc09 3.29 -20 VIN = 36V LOAD CURRENT (mA) 3.30 -40 12.15 12.00 300 3.300 3.31 3.28 VIN = 24V LOAD CURRENT (mA) OUTPUT VOLTAGE vs. TEMPERATURE 3.32 OUTPUT VOLTAGE (V) 250 VIN = 48V 3.301 LOAD CURRENT (mA) 3.27 200 FIGURE 5 APPLICATION CIRCUIT, PWM MODE 3.298 0 150 OUTPUT VOLTAGE vs. LOAD CURRENT 3.302 0.915 0.895 50 3.303 PFM MODE 0.905 12.20 LOAD CURRENT (mA) FEEDBACK VOLTAGE vs. LOAD CURRENT 0.910 VIN = 18V 12.05 2.47 300 250 12.25 OUTPUT VOLTAGE vs. TEMPERATURE MAX15062 toc10 0 FIGURE 8 APPLICATION CIRCUIT, PFM MODE 12.30 OUTPUT VOLTAGE (V) 4.98 2.52 toc06b MAX15062 toc08 VIN = 24V FIGURE 7 APPLICATION CIRCUIT, PFM MODE 2.53 OUTPUT VOLTAGE vs. LOAD CURRENT 12.35 OUTPUT VOLTAGE (V) 5.06 toc06a MAX15062 toc07 OUTPUT VOLTAGE (V) 5.08 2.54 OUTPUT VOLTAGE (V) FIGURE 6 APPLICATION CIRCUIT, PFM MODE MAX15062 toc06 5.10 OUTPUT VOLTAGE vs. LOAD CURRENT 5.02 5.00 4.98 4.96 4.94 FIGURE 6 APPLICATION CIRCUIT, LOAD = 300mA -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) Maxim Integrated 6 MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters Typical Operating Characteristicsc (continued) (VIN = 24V, VGND = 0V, CIN = CVCC = 1F, VEN/UVLO = 1.5V, TA = +25C, unless otherwise noted.) NO-LOAD SUPPLY CURRENT vs. INPUT VOLTAGE FEEDBACK VOLTAGE VS. TEMPERATURE toc10a NO-LOAD SUPPLY CURRENT (A) 0.900 0.896 0.892 0.888 0.884 0 20 40 60 80 92 100 120 PFM MODE 5 15 25 35 45 NO-LOAD SUPPLY CURRENT vs. TEMPERATURE SHUTDOWN CURRENT vs. INPUT VOLTAGE MAX15062 toc12 INPUT VOLTAGE (V) 120 110 100 90 80 6 55 5 4 3 2 1 PFM MODE -40 -20 0 20 40 60 80 0 100 120 5 45 SWITCH CURRENT LIMIT vs. INPUT VOLTAGE 1.95 1.80 1.65 600 550 0 20 40 60 80 TEMPERATURE (C) 100 120 55 SWITCH PEAK CURRENT LIMIT 500 450 400 350 300 SWITCH NEGATIVE CURRENT LIMIT 250 www.maximintegrated.com 35 SHUTDOWN CURRENT vs. TEMPERATURE 2.10 -20 25 INPUT VOLTAGE (V) 2.25 -40 15 TEMPERATURE (C) MAX15062 toc15 70 2.40 SHUTDOWN CURRENT (A) 94 TEMPERATURE (C) MAX15062 toc14 NO-LOAD SUPPLY CURRENT (A) -20 130 1.50 96 MAX15062 toc13 -40 140 60 98 90 SHUTDOWN CURRENT (A) 0.880 SWITCH CURRENT LIMIT (mA) FEEDBACK VOLTAGE (V) 0.904 MAX15062 toc11 100 0.908 200 5 15 25 35 45 55 INPUT VOLTAGE (V) Maxim Integrated 7 MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters Typical Operating Characteristicsc (continued) (VIN = 24V, VGND = 0V, CIN = CVCC = 1F, VEN/UVLO = 1.5V, TA = +25C, unless otherwise noted.) 450 400 350 SWITCH NEGATIVE CURRENT LIMIT 250 200 -40 -20 20 40 60 80 1.18 1.16 1.14 1.12 FALLING 1.10 -40 -20 0 20 40 60 80 TEMPERATURE (C) TEMPERATURE (C) SWITCHING FREQUENCY vs. TEMPERATURE RESET THRESHOLD vs. TEMPERATURE 540 520 500 480 460 440 1.20 1.08 100 120 MAX15062 toc18 SWITCHING FREQUENCY (kHz) 560 0 RISING 1.22 98 100 120 MAX15062 toc19 300 MAX15062 toc17 SWITCH PEAK CURRENT LIMIT 500 EN/UVLO THRESHOLD VOLTAGE (V) 550 EN/UVLO THRESHOLD vs. TEMPERATURE 1.24 97 RESET THRESHOLD (%) SWITCH CURRENT LIMIT (mA) 600 MAX15062 toc16 SWITCH CURRENT LIMIT vs. TEMPERATURE 96 RISING 95 94 93 FALLING 92 91 -40 -20 0 20 40 60 80 100 120 90 0 10 20 30 40 50 60 TEMPERATURE (C) TEMPERATURE (C) LOAD TRANSIENT RESPONSE, PFM MODE (LOAD CURRENT STEPPED FROM 5mA TO 150mA) LOAD TRANSIENT RESPONSE, PFM MODE (LOAD CURRENT STEPPED FROM 5mA TO 150mA) MAX15062 toc21 MAX15062 toc20 VOUT (AC) 100mV/div VOUT (AC) 100mV/div FIGURE 5 APPLICATION CIRCUIT VOUT = 3.3V IOUT 100mA/div IOUT 100mA/div 100s /div www.maximintegrated.com FIGURE 6 APPLICATION CIRCUIT VOUT = 5V 100s /div Maxim Integrated 8 MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters Typical Operating Characteristicsc (continued) (VIN = 24V, VGND = 0V, CIN = CVCC = 1F, VEN/UVLO = 1.5V, TA = +25C, unless otherwise noted.) LOAD TRANSIENT RESPONSE PFM MODE (LOAD CURRENT STEPPED FROM 5mA TO 150mA) LOAD TRANSIENT RESPONSE, PFM MODE (LOAD CURRENT STEPPED FROM 5mA TO 150mA) toc21b toc21a VOUT (AC) 200mV/div VOUT (AC) 100mV/div FIGURE 8 APPLICATION CIRCUIT VOUT = 12V FIGURE 7 APPLICATION CIRCUIT VOUT = 2.5V IOUT 100mA/div IOUT 100mA/div 100s/div 100s/div LOAD TRANSIENT RESPONSE, PFM OR PWM MODE (LOAD CURRENT STEPPED FROM 150mA TO 300mA) LOAD TRANSIENT RESPONSE, PFM OR PWM MODE (LOAD CURRENT STEPPED FROM 150mA TO 300mA) MAX15062 toc22 MAX15062 toc23 VOUT (AC) 100mV/div VOUT (AC) 100mV/div IOUT 100mA/div IOUT 100mA/div FIGURE 5 APPLICATION CIRCUIT VOUT = 3.3V 40s/div 40s/div LOAD TRANSIENT RESPONSE PFM OR PWM MODE (LOAD CURRENT STEPPED FROM 150mA TO 300mA) LOAD TRANSIENT RESPONSE PFM OR PWM MODE (LOAD CURRENT STEPPED FROM 150mA TO 300mA) toc23a VOUT (AC) 50mV/div FIGURE 6 APPLICATION CIRCUIT VOUT = 5V toc23b VOUT (AC) 200mV/div IOUT 100mA/div FIGURE 7 APPLICATION CIRCUIT VOUT = 2.5V 40s/div www.maximintegrated.com IOUT 100mA/div FIGURE 8 APPLICATION CIRCUIT VOUT = 12V 40s/div Maxim Integrated 9 MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters Typical Operating Characteristicsc (continued) (VIN = 24V, VGND = 0V, CIN = CVCC = 1F, VEN/UVLO = 1.5V, TA = +25C, unless otherwise noted.) LOAD TRANSIENT RESPONSE, PWM MODE (LOAD CURRENT STEPPED FROM NO LOAD TO 150mA) LOAD TRANSIENT RESPONSE, PWM MODE PWM mode (LOAD CURRENT STEPPED FROM NO LOAD TO 150mA) MAX15062 toc24 VOUT (AC) 100mV/div MAX15062 toc25 VOUT (AC) 100mV/div FIGURE 5 APPLICATION CIRCUIT VOUT = 3.3V FIGURE 6 APPLICATION CIRCUIT VOUT = 5V IOUT 100mA/div IOUT 100mA/div 40s/div 40s/div LOAD TRANSIENT RESPONSE PWM MODE (LOAD CURRENT STEPPED FROM NO LOAD TO 150mA) LOAD TRANSIENT RESPONSE PWM MODE (LOAD CURRENT STEPPED FROM NO LOAD TO 150mA) toc25b toc25a VOUT (AC) VOUT (AC) 200mV/div 50mV/div FIGURE 8 APPLICATION CIRCUIT VOUT = 12V FIGURE 7 APPLICATION CIRCUIT VOUT = 2.5V IOUT 100mA/div IOUT 100mA/div 40s/div 40s/div FULL-LOAD SWITCHING WAVEFORMS (PWM OR PFM MODE) SWITCHING WAVEFORMS (PFM MODE) MAX15062 toc27 MAX15062 toc26 VOUT (AC) 100mV/div FIGURE 6 APPLICATION CIRCUIT VOUT = 5V, LOAD = 20mA VOUT (AC) 20mV/div VLX 10V/div VLX 10V/div IOUT 200mA/div IOUT 100mA/div 10s/div www.maximintegrated.com VOUT = 5V, LOAD = 300mA 2s/div Maxim Integrated 10 MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters Typical Operating Characteristicsc (continued) (VIN = 24V, VGND = 0V, CIN = CVCC = 1F, VEN/UVLO = 1.5V, TA = +25C, unless otherwise noted.) NO-LOAD SWITCHING WAVEFORMS (PWM MODE) SOFT-START MAX15062 toc28 VOUT = 5V MAX15062 toc29 VEN/UVLO 5V/div VOUT (AC) 20mV/div VLX 10V/div VOUT 1V/div IOUT 100mA/div IOUT 100mA/div VRESET 5V/div 2s/div SOFT-START FIGURE 5 APPLICATION CIRCUIT VOUT = 3.3V 1ms/div SOFT-START toc30a MAX15062 toc30 VEN/UVLO 5V/div VEN/ UVLO 5V/div VOUT 1V/div VOUT 1V/div IOUT 100mA/div VRESET 5V/div IOUT 100mA/div FIGURE 6 APPLICATION CIRCUIT VOUT = 5V VRESET 5V/div 1ms/div 1ms/div SOFT-START SHUTDOWN WITH ENABLE MAX15062 toc31 toc30b VEN/UVLO VEN/UVLO 5V/div 5V/div VOUT 1V/div VOUT 5V/div IOUT 100mA/div IOUT 100mA/div FIGURE 8 APPLICATION CIRCUIT VOUT = 12V VRESET 5V/div 1ms/div www.maximintegrated.com FIGURE 7 APPLICATION CIRCUIT VOUT = 2.5V VRESET 5V/div 400s /div Maxim Integrated 11 MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters Typical Operating Characteristicsc (continued) (VIN = 24V, VGND = 0V, CIN = CVCC = 1F, VEN/UVLO = 1.5V, TA = +25C, unless otherwise noted.) OVERLOAD PROTECTION MAX15062 toc33 VEN/ UVLO 5V/div 40 VIN 20V/div FIGURE 6 APPLICATION CIRCUIT NO LOAD PWM MODE GAIN (dB) VOUT 2V/div VRESET 5V/div BODE PLOT 50 180 50 144 40 108 2 MAX15062 toc35a 72 20 72 20 10 36 10 36 10 0 0 PHASE fCR = 47kHz, PHASE MARGIN = 60 -10 -20 FIGURE 6 APPLICATION CIRCUIT VOUT = 5V -30 -40 -50 -36 2 1k 4 6 81 2 4 6 81 10k 100k 2 PHASE 0 fCR = 43kHz, PHASE MARGIN = 60 -10 -72 -20 -108 -30 -144 -40 -180 -50 0 -36 FIGURE 7 APPLICATION CIRCUIT VOUT = 2.5V 1k 10k 100k GAIN (dB) 30 GAIN PHASE () 108 GAIN (dB) 30 PHASE () 40 20 4 6 81 2 -144 -180 100k BODE PLOT -108 -30 -144 -40 -180 -50 108 0 fCR = 36kHz, PHASE MARGIN = 66 -36 -72 FIGURE 8 APPLICATION CIRCUIT VOUT = 12V 1k 10k 100k MAX15062, 5V OUTPUT, 0.3A LOAD CURRENT, CONDUCTED EMI CURVE MAX16052 toc36 CONDUCTED EMI (dBV) 60 QUASI-PEAK LIMIT 50 AVERAGE LIMIT 40 30 PEAK EMISSIONS 20 AVERAGE EMISSIONS 10 0.15 1 FREQUENCY (MHz) 10 30 Measured on the MAX15062BEVKIT with Input Filter- CIN = 4.7F, LIN = 10H www.maximintegrated.com 72 36 FREQUENCY (Hz) 70 180 144 PHASE -10 -20 MAX15062 toc35b GAIN 0 -72 FREQUENCY (Hz) FREQUENCY (Hz) 2 -108 FREQUENCY (Hz) 144 GAIN -72 10k 50 30 4 6 81 1k 180 40 -36 FIGURE 5 APPLICATION CIRCUIT VOUT = 3.3V -40 BODE PLOT 0 fCR = 47kHz, PHASE MARGIN = 59 -10 20ms/div MAX15062 toc35 72 36 0 -30 1ms /div 108 10 -50 180 144 PHASE -20 IOUT 200mA/div MAX15062 toc34 GAIN 30 20 VOUT 1V/div GAIN (dB) BODE PLOT 50 Maxim Integrated 12 -108 -144 -180 PHASE () MAX15062 toc32 PHASE () SOFT-START WITH 3V PREBIAS MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters Pin Configuration TOP VIEW LX GND RESET MODE 8 7 6 5 MAX15062 + 1 2 3 4 VIN EN/UVLO VCC FB/VOUT TDFN (2mm x 2mm) Pin Description PIN NAME FUNCTION 1 VIN Switching Regulator Power Input. Connect a X7R 1F ceramic capacitor from VIN to GND for bypassing. 2 EN/UVLO Active-High, Enable/Undervoltage-Detection Input. Pull EN/UVLO to GND to disable the regulator output. Connect EN/UVLO to VIN for always-on operation. Connect a resistor-divider between VIN and EN/UVLO to GND to program the input voltage at which the device is enabled and turns on. 3 VCC 4 FB/VOUT 5 MODE PFM/PWM Mode Selection Input. Connect MODE to GND to enable the fixed-frequency PWM operation. Leave unconnected for light-load PFM operation. 6 RESET Open-Drain Reset Output. Pull up RESET to an external power supply with an external resistor. RESET goes low when the output voltage drops below 92% of the set nominal regulated voltage. RESET goes high impedance 2ms after the output voltage rises above 95% of its regulation value. See the Electrical Characteristics table for threshold values. 7 GND Ground. Connect GND to the power ground plane. Connect all the circuit ground connections together at a single point. See the PCB Layout Guidelines section. 8 LX Inductor Connection. Connect LX to the switching side of the inductor. LX is high impedance when the device is in shutdown. www.maximintegrated.com Internal LDO Power Output. Bypass VCC to GND with a minimum 1F capacitor. Feedback Input. For fixed output voltage versions, connect FB/VOUT directly to the output. For the adjustable output voltage version, connect FB/VOUT to a resistor-divider between VOUT and GND to adjust the output voltage from 0.9V to 0.89 x VIN. Maxim Integrated 13 MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters Block Diagram VIN LDO REGULATOR PEAK-LIMIT RUNAWAYCURRENTLIMIT SENSE LOGIC PFM VCC MAX15062 CS CURRENTSENSE AMPLIFIER POK EN/UVLO DH CHIPEN HIGH-SIDE DRIVER 1.215V THERMAL SHUTDOWN VCC CLK LX OSCILLATOR SLOPE 500k MODE MODE SELECT 0.55VCC PFM/PWM CONTROL LOGIC DL LOW-SIDE DRIVER SLOPE CS FB/VOUT R1 * PWM SINK-LIMIT ERROR AMPLIFIER R2 REFERENCE SOFT-START CLK *RESISTOR-DIVIDER ONLY FOR MAX15062A, MAX15062B www.maximintegrated.com LOW-SIDE CURRENT SENSE NEGATIVE CURRENT REF 3.135V FOR MAX15062A 4.75V FOR MAX15062B 0.859V FOR MAX15062C FB/VOUT GND RESET 2ms DELAY Maxim Integrated 14 MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters Detailed Description The MAX15062 high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operates over a wide 4.5V to 60V input voltage range. The converter delivers output current up to 300mA at 3.3V (MAX15062A), 5V (MAX15062B), and adjustable output voltages (MAX15062C). When EN/UVLO and VCC UVLO are satisfied, an internal power-up sequence soft-starts the error-amplifier reference, resulting in a clean monotonic output-voltage soft-start independent of the load current. The FB/VOUT pin monitors the output voltage through a resistor-divider. RESET transitions to a high-impedance state 2ms after the output voltage reaches 95% of regulation. The device selects either PFM or forced-PWM mode depending on the state of the MODE pin at power-up. By pulling the EN/UVLO pin to low, the device enters the shutdown mode and consumes only 2.2A (typ) of standby current. DC-DC Switching Regulator The device uses an internally compensated, fixed-frequency, current-mode control scheme (see the Block Diagram). On the rising edge of an internal clock, the high-side pMOSFET turns on. An internal error amplifier compares the feedback voltage to a fixed internal reference voltage and generates an error voltage. The error voltage is compared to a sum of the current-sense voltage and a slope-compensation voltage by a PWM comparator to set the on-time. During the on-time of the pMOSFET, the inductor current ramps up. For the remainder of the switching period (off-time), the pMOSFET is kept off and the low-side nMOSFET turns on. During the off-time, the inductor releases the stored energy as the inductor current ramps down, providing current to the output. Under overload conditions, the cycle-by-cycle current-limit feature limits the inductor peak current by turning off the high-side pMOSFET and turning on the low-side nMOSFET. Mode Selection (MODE) The logic state of the MODE pin is latched after VCC and EN/UVLO voltages exceed respective UVLO rising thresholds and all internal voltages are ready to allow LX switching. If the MODE pin is unconnected at powerup, the part operates in PFM mode at light loads. If the MODE pin is grounded at power-up, the part operates in constant-frequency PWM mode at all loads. State changes on the MODE pin are ignored during normal operation. PWM Mode Operation In PWM mode, the inductor current is allowed to go negative. PWM operation is useful in frequency sensi- www.maximintegrated.com tive applications and provides fixed switching frequency at all loads. However, the PWM mode of operation gives lower efficiency at light loads compared to PFM mode of operation. PFM Mode Operation PFM mode operation disables negative inductor current and additionally skips pulses at light loads for high efficiency. In PFM mode, the inductor current is forced to a fixed peak of 130mA every clock cycle until the output rises to 102.3% of the nominal voltage. Once the output reaches 102.3% of the nominal voltage, both high-side and low-side FETs are turned off and the part enters hibernate operation until the load discharges the output to 101.1% of the nominal voltage. Most of the internal blocks are turned off in hibernate operation to save quiescent current. After the output falls below 101.1% of the nominal voltage, the device comes out of hibernate operation, turns on all internal blocks, and again commences the process of delivering pulses of energy to the output until it reaches 102.3% of the nominal output voltage. The device naturally exits PFM mode when the load current exceeds 55mA (typ). The advantage of the PFM mode is higher efficiency at light loads because of lower quiescent current drawn from supply. Internal 5V Linear Regulator An internal regulator provides a 5V nominal supply to power the internal functions and to drive the power MOSFETs. The output of the linear regulator (VCC) should be bypassed with a 1F capacitor to GND. The VCC regulator dropout voltage is typically 150mV. An undervoltagelockout circuit that disables the regulator when VCC falls below 3.8V (typ). The 400mV VCC UVLO hysteresis prevents chattering on power-up and power-down. Enable Input (EN/UVLO), Soft-Start When EN/UVLO voltage is above 1.21V (typ), the device's internal error-amplifier reference voltage starts to ramp up. The duration of the soft-start ramp is 4.1ms, allowing a smooth increase of the output voltage. Driving EN/UVLO low disables both power MOSFETs, as well as other internal circuitry, and reduces VIN quiescent current to below 2.2A. EN/UVLO can be used as an input-voltage UVLO adjustment input. An external voltage-divider between VIN and EN/UVLO to GND adjusts the input voltage at which the device turns on or turns off. If input UVLO programming is not desired, connect EN/UVLO to VIN (see the Electrical Characteristics table for EN/UVLO rising and falling threshold voltages). Maxim Integrated 15 MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters Reset Output (RESET) The device includes an open-drain RESET output to monitor the output voltage. RESET goes high impedance 2ms after the output rises above 95% of its nominal set value and pulls low when the output voltage falls below 92% of the set nominal regulated voltage. RESET asserts low during the hiccup timeout period. Startup into a Prebiased Output The device is capable of soft-start into a prebiased output, without discharging the output capacitor in both the PFM and forced-PWM modes. Such a feature is useful in applications where digital integrated circuits with multiple rails are powered. Operating Input Voltage Range The maximum operating input voltage is determined by the minimum controllable on-time and the minimum operating input voltage is determined by the maximum duty cycle and circuit voltage drops. The minimum and maximum operating input voltages for a given output voltage should be calculated as follows: VINMIN VOUT + (I OUT x (R DCR + 0.5)) + (I OUT x 1.0) D MAX VINMAX = VOUT t ONMIN x f SW where VOUT is the steady-state output voltage, IOUT is the maximum load current, RDCR is the DC resistance of the inductor, fSW is the switching frequency (max), DMAX is maximum duty cycle (0.89), and tONMIN is the worstcase minimum controllable switch on-time (130ns). Overcurrent Protection/Hiccup Mode The device is provided with a robust overcurrent protection scheme that protects the device under overload and output short-circuit conditions. A cycle-by-cycle peak current limit turns off the high-side MOSFET whenever the high-side switch current exceeds an internal limit of 0.56A (typ). A runaway current limit on the high-side switch current at 0.66A (typ) protects the device under high input voltage, and short-circuit conditions when there is insufficient output voltage available to restore the inductor current that was built up during the on period of the step-down converter. One occurrence of the runaway current limit triggers a hiccup mode. In addition, if due www.maximintegrated.com to a fault condition, output voltage drops to 65% (typ) of its nominal value any time after soft-start is complete, hiccup mode is triggered. In hiccup mode, the converter is protected by suspending switching for a hiccup timeout period of 131ms. Once the hiccup timeout period expires, soft-start is attempted again. Hiccup mode of operation ensures low power dissipation under output short-circuit conditions. Care should be taken in board layout and system wiring to prevent violation of the absolute maximum rating of the FB/VOUT pin under short-circuit conditions. Under such conditions, it is possible for the ceramic output capacitor to oscillate with the board or wiring inductance between the output capacitor or short-circuited load, thereby causing the absolute maximum rating of FB/VOUT (-0.3V) to be exceeded. The parasitic board or wiring inductance should be minimized and the output voltage waveform under short-circuit operation should be verified to ensure the absolute maximum rating of FB/VOUT is not exceeded. Thermal Overload Protection Thermal overload protection limits the total power dissipation in the device. When the junction temperature exceeds +166C, an on-chip thermal sensor shuts down the device, turns off the internal power MOSFETs, allowing the device to cool down. The thermal sensor turns the device on after the junction temperature cools by 10C. Applications Information Inductor Selection A low-loss inductor having the lowest possible DC resistance that fits in the allotted dimensions should be selected. The saturation current (ISAT) must be high enough to ensure that saturation cannot occur below the maximum current-limit value. The required inductance for a given application can be determined from the following equation: L = 9.3 x VOUT where L is inductance in H and VOUT is output voltage. Once the L value is known, the next step is to select the right core material. Ferrite and powdered iron are commonly available core materials. Ferrite cores have low core losses and are preferred for high-efficiency designs. Powdered iron cores have more core losses and are relatively cheaper than ferrite cores. See Table 1 to select the inductors for typical applications. Maxim Integrated 16 MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters Table 1. Inductor Selection INPUT VOLTAGE RANGE VIN (V) VOUT (V) IOUT (mA) L (H) 4.5 to 60 3.3 (Fixed) 300 33 Coilcraft LPS4018-333ML 6 to 60 5 (Fixed) 300 47 Coilcraft LPS4018-473ML 4.5 to 60 1.8 or 2.5 300 22 Coilcraft LPS4018-223ML 14 to 60 12 300 100 Wurth 74408943101 17 to 60 15 300 150 TDK VLC6045T-151M RECOMMENDED PART NO. Table 2. Output Capacitor Selection INPUT VOLTAGE RANGE VIN (V) VOUT (V) IOUT (mA) COUT (F) 4.5 to 60 3.3 (Fixed) 300 10F/1206/X7R/6.3V Murata GRM31CR70J106K RECOMMENDED PART NO. 6 to 60 5 (Fixed) 300 10F/1206/X7R/6.3V Murata GRM31CR70J106K 4.5 to 60 1.8 or 2.5 300 22F/1206/X7R/6.3V Murata GRM31CR70J226K 14 to 60 12 300 4.7F/1206/X7R/16V Murata GRM31CR71C475K 17 to 60 15 300 4.7F/1206/X7R/25V Murata GRM31CR71E475K VIN VIN R1 MAX15062 EN/UVLO R2 Figure 1. Adjustable EN/UVLO Network Input Capacitor The input filter capacitor reduces peak currents drawn from the power source and reduces noise and voltage ripple on the input caused by the circuit's switching. The input capacitor RMS current requirement (IRMS) is defined by the following equation: (VOUT x (VIN - VOUT) IRMS = IOUT(MAX) x VIN where, IOUT(MAX) is the maximum load current. IRMS has a maximum value when the input voltage equals twice the output voltage (VIN = 2 x VOUT), so IRMS(MAX) = IOUT(MAX)/2. Choose an input capacitor that exhibits less than +10C temperature rise at the RMS input current for optimal long-term reliability. Use low-ESR ceramic capacitors www.maximintegrated.com with high-ripple-current capability at the input. X7R capacitors are recommended in industrial applications for their temperature stability. Calculate the input capacitance using the following equation: CIN = IOUT(MAX) x D x (1 - D) x fSW x VIN where D = VOUT/VIN is the duty ratio of the converter, fSW is the switching frequency, VIN is the allowable input voltage ripple, and is the efficiency. In applications where the source is located distant from the device input, an electrolytic capacitor should be added in parallel to the ceramic capacitor to provide necessary damping for potential oscillations caused by the inductance of the longer input power path and input ceramic capacitor. Output Capacitor Small ceramic X7R-grade capacitors are sufficient and recommended for the device. The output capacitor has two functions. It filters the square wave generated by the device along with the output inductor. It stores sufficient energy to support the output voltage under load transient conditions and stabilizes the device's internal control loop. Usually the output capacitor is sized to support a step load of 50% of the maximum output current in the application, such that the output-voltage deviation is less than 3%. Required output capacitance can be calculated from the following equation: Maxim Integrated 17 MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters C OUT = 30 VOUT where COUT is the output capacitance in F and VOUT is the output voltage. Derating of ceramic capacitors with DC-voltage must be considered while selecting the output capacitor. Derating curves are available from all major ceramic capacitor vendors. See Table 2 to select the output capacitor for typical applications. Setting the Input Undervoltage-Lockout Level The devices offer an adjustable input undervoltagelockout level. Set the voltage at which the device turns on with a resistive voltage-divider connected from VIN to GND (see Figure 1). Connect the center node of the divider to EN/UVLO. Choose R1 to be 3.3M max, and then calculate R2 as follows: R1x 1.215 R2 = (VINU - 1.215) where VINU is the voltage at which the device is required to turn on. If the EN/UVLO pin is driven from an external signal source, a series resistance of minimum 1k is recommended to be placed between the signal source output and the EN/UVLO pin, to reduce voltage ringing on the line. Adjusting the Output Voltage The MAX15062C output voltage can be programmed from 0.9V to 0.89 x VIN. Set the output voltage by connecting a resistor-divider from output to FB to GND (see Figure 2). For the output voltages less than 6V, choose R2 in the 50k to 150k range. For the output voltages greater than 6V, choose R2 in the 25k to 75k range and calculate R1 with the following equation: V = R2 x OUT R1 0.9 - 1 where POUT is the output power, is the efficiency of power conversion, and RDCR is the DC resistance of the output inductor. See the Typical Operating Characteristics for the power-conversion efficiency or measure the efficiency to determine the total power dissipation. The junction temperature (TJ) of the device can be estimated at any ambient temperature (TA) from the following equation: TJ= T A + ( JA x PLOSS ) where JA is the junction-to-ambient thermal impedance of the package. Junction temperature greater than +125C degrades operating lifetimes. PCB Layout Guidelines Careful PCB layout is critical to achieve clean and stable operation. The switching power stage requires particular attention. Follow the guidelines below for good PCB layout. Place the input ceramic capacitor as close as possible to the VIN and GND pins. Connect the negative terminal of the VCC bypass capacitor to the GND pin with shortest possible trace or ground plane. Minimize the area formed by the LX pin and the inductor connection to reduce the radiated EMI. Place the VCC decoupling capacitor as close as possible to the VCC pin. Ensure that all feedback connections are short and direct. Route the high-speed switching node (LX) away from the FB/VOUT, RESET, and MODE pins. For a sample PCB layout that ensures the first-pass success, refer to the MAX15062 evaluation kit layouts available at www.maximintegrated.com. VOUT Power Dissipation At a particular operating condition, the power losses that lead to temperature rise of the part are estimated as follows: 1 2 PLOSS = POUT x - 1 - (I OUT x R DCR ) P= OUT VOUT x I OUT www.maximintegrated.com R1 FB MAX15062C R2 GND Figure 2. Setting the Output Voltage Maxim Integrated 18 MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters VIN VIN CIN LX L1 VOUT COUT R1 GND EN/UVLO MAX15062A/B R2 VOUT VCC VCC CVCC RESET R3 MODE VCC VIN PLANE CIN U1 R1 LX VIN EN/UVLO GND VCC R2 CVCC L1 COUT RESET VOUT MODE R3 VIAS TO BOTTOM-SIDE GROUND PLANE VIAS TO VOUT GND PLANE VOUT PLANE VIAS TO VCC Figure 3. Layout Guidelines for MAX15062A and MAX15062B www.maximintegrated.com Maxim Integrated 19 MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters VIN VIN CIN LX L1 VOUT COUT R1 GND EN/UVLO R4 MAX15062C R2 FB VCC R5 VCC CVCC RESET R3 MODE VCC VIN PLANE CIN U1 R1 LX VIN EN/UVLO GND VCC R2 CVCC L1 COUT RESET FB MODE GND PLANE R5 VOUT PLANE R4 R3 VIAS TO BOTTOM-SIDE GROUND PLANE VIAS TO VOUT VIAS TO VCC Figure 4. Layout Guidelines for MAX15062C www.maximintegrated.com Maxim Integrated 20 MAX15062 VIN 4.5V TO 60V CIN 1F 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters VIN EN/UVLO LX L1 33H COUT 10F GND VOUT 3.3V, 300mA VIN 6V TO 60V CIN 1F MAX15062A CVCC 1F VCC MODE EN/UVLO LX COUT 10F GND RESET CVCC 1F VOUT VCC MODE RESET VOUT MODE = GND FOR PWM MODE = OPEN FOR PFM MODE = GND FOR PWM MODE = OPEN FOR PFM L1: COILCRAFT LPS4018-333ML COUT: MURATA 10F/X7R/6.3V/1206 GRM31CR70J106K CIN: MURATA 1F/X7R/100V/1206 GRM31CR72A105K L1: COILCRAFT LPS4018-473ML COUT: MURATA 10F/X7R/6.3V/1206 GRM31CR70J106K CIN: MURATA 1F/X7R/100V/1206 GRM31CR72A105K CIN 1F VIN EN/UVLO LX Figure 6. 5V, 300mA Step-Down Regulator L1 22H GND MAX15062C CVCC 1F VCC MODE COUT 22F VOUT 2.5V, 300mA CIN 1F R1 133k FB RESET VIN 14V TO 60V EN/UVLO LX COUT 4.7F GND VCC MODE FB R2 40.2k RESET MODE = GND FOR PWM MODE = OPEN FOR PFM L1: COILCRAFT LPS4018-223ML COUT: MURATA 22F/X7R/6.3V/1206 (GRM31CR70J226K) CIN: MURATA 1F/X7R/100V/1206 (GRM31CR72A105K) L1: Wurth 74408943101 COUT: MURATA 4.7F/X7R/16V/1206 (GRM31CR71C475K) CIN: MURATA 1F/X7R/100V/1206 (GRM31CR72A105K) Figure 7. 2.5V, 300mA Step-Down Regulator VOUT 12V, 300mA R1 499k MAX15062C CVCC 1F R2 75k VIN L1 100H MODE = GND FOR PWM MODE = OPEN FOR PFM www.maximintegrated.com VOUT 5V, 300mA MAX15062B Figure 5. 3.3V, 300mA Step-Down Regulator VIN 4.5V TO 60V VIN L1 47H Figure 8. 12V, 300mA Step-Down Regulator Maxim Integrated 21 MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters Ordering Information VIN 4.5V TO 60V CIN 1F VIN EN/UVLO LX L1 22H COUT 22F GND R1 75k MAX15062C CVCC 1F R2 75k RESET L1: COILCRAFT LPS4018-223ML COUT: MURATA 22F/X7R/6.3V/1206 (GRM31CR70J226K) CIN: MURATA 1F/X7R/100V/1206 (GRM31CR72A105K) CIN 1F EN/UVLO VCC MODE MAX15062AATA+ -40C to +125C 8 TDFN 3.3V MAX15062BATA+ -40C to +125C 8 TDFN 5V MAX15062CATA+ -40C to +125C 8 TDFN Adj Chip Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. LX L1 150H GND MAX15062C CVCC 1F VOUT Package Information Figure 9. 1.8V, 300mA Step-Down Regulator VIN PINPACKAGE PROCESS: BiCMOS MODE = GND FOR PWM MODE = OPEN FOR PFM VIN 17V TO 60V TEMP RANGE PART +Denotes a lead(Pb)-free/RoHS-compliant package. FB VCC MODE VOUT 1.8V, 300mA COUT 4.7F VOUT 15V, 300mA PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 8 TDFN T822CN+1 21-0487 90-0349 R1 499k FB RESET R2 31.6k MODE = GND FOR PWM MODE = OPEN FOR PFM L1: TDK VLC6045T-151M COUT: MURATA 4.7F/X7R/25V/1206 (GRM31CR71E475K) CIN: MURATA 1F/X7R/100V/1206 (GRM31CR72A105K) Figure 10. 15V, 300mA Step-Down Regulator www.maximintegrated.com Maxim Integrated 22 MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters Revision History REVISION NUMBER REVISION DATE PAGES CHANGED DESCRIPTION 0 6/13 Initial release 1 10/13 Added MAX15062C, added figures, updated tables and figures throughout 1-17 -- 2 7/16 Operating and Junction temperature value update, additional TOC and text. 1-4, 12, 16-18 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated's website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. (c) 2016 Maxim Integrated Products, Inc. 23 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX15062AATA+T MAX15062BATA+T MAX15062DATA+T MAX15062CATA+T MAX15062BATA+ MAX15062AATA+