MAX17501 60V, 500mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converter
General Description
The MAX17501 high-efficiency, high-voltage, synchro nous
step-down DC-DC converter with integrated MOSFETs
operates over a 4.5V to 60V input voltage range. It deliv-
ers output currents up to 500mA at output voltages of
0.9V to 92%VIN. The output voltage is accurate to within
±1.7% over -40°C to +125°C. The MAX17501 is avail-
able in a compact TDFN package. Simulation models are
available.
The device features peak-current-mode control with
pulse-width modulation (PWM). Users can choose devic-
es with either pulse frequency modulation (PFM) or forced
PWM scheme. PFM devices skip pulses at light load for
higher efficiency, while forced-PWM devices operate with
fixed switching frequency at any load for noise sensi-
tive-applications. The low-resistance, on-chip MOSFETs
ensure high efficiency at full load and simplify the layout.
A programmable soft-start feature allows users to reduce
input inrush current. The device also incorporates an
output enable/undervoltage lockout pin (EN/UVLO) that
allows the user to turn on the part at the desired input-
voltage level. An open-drain RESET pin provides a
delayed power-good signal to the system upon achieving
successful regulation of the output voltage.
Applications
● IndustrialProcessControl
● HVACandBuildingControl
● BaseStation,VOIP,Telecom
● HomeTheatre
● Automotive
● Battery-PoweredEquipment
● General-PurposePoint-of-Load
Benets and Features
● EliminatesExternalComponentsandReduceTotal
Cost
• NoSchottky-SynchronousOperationforHigh
EfficiencyandReducedCost
• Internal Compensation and Feedback Divider for
3.3V and 5V Outputs
• All-Ceramic Capacitors, Ultra-Compact Layout
● ReducesNumberofDC-DCRegulatorstoStock
• Wide4.5Vto60VInputVoltageRange
• 0.9V to 92%VIN Output Voltage
• Delivers up to 500mA
• 600kHzand300kHzSwitchingFrequencyOptions
• Available in a 10-Pin, 3mm x 2mm TDFN Package
● ReducesPowerDissipation
• Peak Efficiency > 90%
• PFMFeatureforHighLight-LoadEfficiency
• ShutdownCurrent=0.9μA(typ)
● OperatesReliablyinAdverseIndustrialEnvironments
• Hiccup-ModeCurrentLimit,SinkCurrentLimit,
and Autoretry Startup
• Built-InOutput-VoltageMonitoring(Open-Drain
RESET Pin)
• Resistor-ProgrammableEN/UVLOThreshold
• Adjustable Soft-Start and Prebiased Power-Up
• -40°Cto+125°CIndustrialTemperatureRange
19-6244; Rev 2; 1/13
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part, refer
to www.maximintegrated.com/MAX17501.related.
MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
www.maximintegrated.com Maxim Integrated
│
2
Electrical Characteristics
(VIN = 24V, VGND = VPGND = 0V, CVIN = CVCC=1μF,VEN = 1.5V, CSS = 3300pF, VFB = 0.98 x VOUT, LX = unconnected, RESET
= unconnected. TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to
GND,unlessotherwisenoted.)(Note2)
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.
VINtoGND.............................................................-0.3Vto+70V
EN/UVLOtoGND.......................................-0.3V to (VIN + 0.3V)
LXtoPGND................................................-0.3V to (VIN + 0.3V)
FB,RESET,COMP,SStoGND .............................-0.3V to +6V
VCCtoGND..............................................................-0.3Vto+6V
GNDtoPGND.......................................................-0.3Vto+0.3V
LXTotalRMSCurrent.........................................................±1.6A
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (TA = +70°C)
(derate 14.9mW/°C above +70°C) (multilayer board) .1188.7mW
OperatingTemperatureRange.........................-40°Cto+125°C
Junction Temperature......................................................+150°C
StorageTemperatureRange.............................-65°Cto+160°C
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow).......................................+260°C
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.
Package Thermal Characteristics (Note 1)
TDFN
Junction-to-AmbientThermalResistance(θJA) .......67.3°C/W
Junction-to-CaseThermalResistance(θJC) ............18.2°C/W
Absolute Maximum Ratings
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
INPUT SUPPLY (VIN)
InputVoltageRange VIN 4.5 60 V
Input Supply Current
IIN-SH VEN = 0V, shutdown mode 0.9 3.5 µA
IIN-HIBERNATE VFB = 1.03 x VOUT,MAX17501A/B 90 145
IIN-SW
Normal
switching mode,
no load
MAX17501E/F/G 4.75 6.75
mA
MAX17501H 2.5 3.6
ENABLE/UVLO (EN/UVLO)
EN Threshold
VENR VEN rising 1.194 1.218 1.236
VVENF VEN falling 1.114 1.135 1.156
VEN-TRUESD VEN falling, true shutdown 0.7
EN Input Leakage Current IEN VEN = VIN = 60V, TA = +25°C 8 200 nA
LDO
VCCOutputVoltageRange VCC
6V < VIN < 12V, 0mA < IVCC < 10mA,
12V < VIN < 60V, 0mA < IVCC < 2mA 4.65 5 5.35 V
VCC Current Limit IVCC-MAX VCC = 4.3V, VIN = 12V 15 40 80 mA
VCC Dropout VCC-DO VIN = 4.5V, IVCC = 5mA 4.1 V
VCC UVLO VCC-UVR VCC rising 3.85 4 4.15 V
VCC-UVF VCC falling 3.55 3.7 3.85
MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
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Electrical Characteristics (continued)
(VIN = 24V, VGND = VPGND = 0V, CVIN = CVCC=1μF,VEN = 1.5V, CSS = 3300pF, VFB = 0.98 x VOUT, LX = unconnected, RESET
= unconnected. TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. 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 = 0.5A
(sourcing)
TA = +25°C 0.55 0.85
Ω
TA = TJ = +125°C
(Note 3) 1.2
Low-SidenMOSOn-Resistance RDS-ONL
ILX = 0.5A
(sinking)
TA = +25°C 0.2 0.35
Ω
TA = TJ = +125°C
(Note 3) 0.47
LX Leakage Current ILX_LKG VEN = 0V, TA = +25°C,
VLX = (VPGND + 1V) to (VIN - 1V) 1 µA
SOFT-START (SS)
Charging Current ISS VSS = 0.5V 4.7 5 5.3 µA
FEEDBACK (FB/VO)
FBRegulationVoltage VFB_REG MAX17501G/H 0.884 0.9 0.916 V
FBInputBiasCurrent IFB TA = +25NC
MAX17501A/E, VFB
= 3.3V 6.8 12 17
µA
MAX17501B/F,VFB
= 5V 6.8 12 17
MAX17501G/H,VFB
= 0.9V 100 nA
OUTPUT VOLTAGE (VOUT)
OutputVoltageRange VOUT
MAX17501A/E 3.248 3.3 3.352
V
MAX17501B/F 4.922 5 5.08
MAX17501G 0.9 0.92 x
VIN
MAX17501H 0.9 0.965
x VIN
VOUT Threshold for Entering
HibernateMode VFB_HBR VFBrising,MAX17501A/B 103.3 %
VOUT Threshold for Exiting
HibernateMode VFB_HBF VFBfalling,MAX17501A/B 101.3 %
TRANSCONDUCTANCE AMPLIFIER (COMP)
Transconductance GMICOMP = ±2.5µA,MAX17501G/H 510 590 650 µS
COMP Source Current ICOMP_SRC MAX17501G/H 19 32 55 µA
COMP Sink Current ICOMP_SINK MAX17501G/H 19 32 55 µA
Current-Sense Transresistance RCS MAX17501G/H 0.9 1 1.1 V/A
MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
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│
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Electrical Characteristics (continued)
(VIN = 24V, VGND = VPGND = 0V, CVIN = CVCC=1μF,VEN = 1.5V, CSS = 3300pF, VFB = 0.98 x VOUT, LX = unconnected, RESET
= unconnected. TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to
GND,unlessotherwisenoted.)(Note2)
Note 2: All limits are 100% tested at +25°C. Limits over temperature are guaranteed by design.
Note 3: Guaranteedbydesign,notproductiontested.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CURRENT LIMIT
Peak Current-Limit Threshold IPEAK-LIMIT 0.64 0.76 0.86 A
RunawayCurrent-LimitThreshold IRUNAWAY-
LIMIT
0.65 0.78 0.905 A
Sink Current-Limit Threshold ISINK-LIMIT
MAX17501A/B 0.03 A
MAX17501E/F/G/H 0.3 0.35 0.4
PFM Current-Limit Threshold IPFM MAX17501A/B 0.125 A
TIMINGS
Switching Frequency fSW
VFB > VOUT-
HICF
MAX17501A/B/E/F/G 560 600 640
kHzMAX17501H 280 300 320
VFB < VOUT-HICF 280 300 320
EventstoHiccupafterCrossing
RunawayCurrentLimit 1 Event
VOUT Undervoltage Trip Level to
CauseHiccup VOUT-HICF VSS > 0.95V (soft-start is done) 69.14 71.14 73.14 %
HICCUPTimeout 32,768 Cycles
Minimum On-Time tON_MIN 75 120 ns
Maximum Duty Cycle DMAX
VFB = 0.98 x
VFB-REG
MAX17501A/B/E/F/G 92 94 96 %
MAX17501H 96.5 97.5 98.5
LX Dead Time 5 ns
RESET
RESET Output Level Low IRESET = 1mA 0.02 V
RESET Output Leakage
CurrentHigh VFB = 1.01 x VFB-REG, TA = +25°C 0.45 µA
VOUT Threshold for RESET Falling VOUT-OKF VFB falling 90.5 92.5 94.5 %
VOUT Threshold for RESETRising VOUT-OKR VFB rising 93.5 95.5 97.5 %
RESETDelayAfterFBReaches
95%Regulation VFB rising 1024 Cycles
THERMAL SHUTDOWN
Thermal-Shutdown Threshold Temperature rising 165 °C
Thermal-ShutdownHysteresis 10 °C
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MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
Typical Operating Characteristics
(VIN = 24V, VGND = VPGND = 0V, CVIN = CVCC=1μF,VEN = 1.5V, CSS = 3300pF, VFB = 0.98 x VOUT, LX = unconnected, RESET =
unconnected, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA=+25°C.AllvoltagesarereferencedtoGND,
unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
(MAX17501A)
LOAD CURRENT (mA)
EFFICIENCY (%)
10010
40
50
60
70
80
90
100
30
1
VIN = 12V
VIN = 24V
VIN = 36V
MAX17501 toc01
EFFICIENCY vs. LOAD CURRENT
(MAX17501B)
LOAD CURRENT (mA)
EFFICIENCY (%)
10010
40
50
60
70
80
90
100
30
1
VIN = 12V VIN = 24V
VIN = 36V VIN = 48V
MAX17501 toc02
EFFICIENCY vs. LOAD CURRENT
(MAX17501E)
LOAD CURRENT (mA)
EFFICIENCY (%)
450400300 350150 200 250100
50
55
60
65
70
75
80
85
90
95
45
50 500
VIN = 36VVIN = 24V
VIN = 12V
MAX17501 toc03
EFFICIENCY vs. LOAD CURRENT
(MAX17501F)
LOAD CURRENT (mA)
EFFICIENCY (%)
450400300 350150 200 250100
50
60
70
80
90
100
40
50 500
VIN = 48V
VIN = 12V
VIN = 36V
VIN = 24V
MAX17501 toc04
OUTPUT VOLTAGE vs. LOAD CURRENT
(MAX17501A)
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
45040035030025020015010050
3.30
3.35
3.40
3.45
3.25
0 500
VIN = 36V
VIN = 24V
VIN = 12V
MAX17501 toc05
OUTPUT VOLTAGE vs. LOAD CURRENT
(MAX17501B)
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
45040035030025020015010050
4.95
5.15
5.10
5.05
5.00
5.20
4.90
0 500
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 48V
MAX17501 toc06
OUTPUT VOLTAGE vs. LOAD CURRENT
(MAX17501E)
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
450400350300250200150100500 500
3.295
3.300
3.305
3.310
3.315
3.320
3.290
VIN = 24V
VIN = 12V VIN = 36V
MAX17501 toc07
OUTPUT VOLTAGE vs. LOAD CURRENT
(MAX17501F)
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
450400350300250200150100500 500
4.97
4.96
4.98
4.99
5.00
5.01
5.03
5.02
5.04
5.05
4.95
VIN = 48V VIN = 36V VIN = 24V VIN = 12V
MAX17501 toc08
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX17501 toc09
TEMPERATURE (°C)
SHUTDOWN CURRENT (µA)
100120806040200-20
0.75
0.80
0.85
0.90
0.95
1.00
1.05
1.10
0.70
-40
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MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
Typical Operating Characteristics (continued)
(VIN = 24V, VGND = VPGND = 0V, CVIN = CVCC=1μF,VEN = 1.5V, CSS = 3300pF, VFB = 0.98 x VOUT, LX = unconnected, RESET =
unconnected, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA=+25°C.AllvoltagesarereferencedtoGND,
unless otherwise noted.)
NO-LOAD SWITCHING CURRENT
vs. TEMPERATURE (PFM OPERATION)
MAX17501 toc10
TEMPERATURE (°C)
NO-LOAD SWITCHING CURRENT (µA)
100 120806040200-20
60
80
100
120
140
40
-40
NO-LOAD SWITCHING CURRENT vs. TEMPERATURE
(FORCED-PWM OPERATION)
MAX17501 toc11
TEMPERATURE (°C)
NO-LOAD SWITCHING CURRENT (mA)
100 120806040200-20
4.85
4.90
4.95
5.00
4.80
-40
EN/UVLO THRESHOLD
vs. TEMPERATURE
MAX17501 toc12
TEMPERATURE (°C)
EN/UVLO THRESHOLD VOLTAGE (V)
100 120806040200-20
1.13
1.14
1.16
1.18
1.20
1.23
1.22
1.21
1.19
1.17
1.15
1.12
-40
RISING
THRESHOLD
FALLING
THRESHOLD
NO-LOAD OUTPUT VOLTAGE
vs. TEMPERATURE (MAX17501E)
MAX17501 toc13
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
100 120806040200-20
3.275
3.300
3.325
3.350
3.250
-40
NO-LOAD OUTPUT VOLTAGE
vs. TEMPERATURE (MAX17501F)
MAX17501 toc14
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
100 120806040200-20
4.975
5.000
5.025
5.050
4.950
-40
FEEDBACK VOLTAGE
vs. TEMPERATURE
MAX17501 toc15
TEMPERATURE (°C)
FEEDBACK VOLTAGE (V)
100 120806040200-20
0.89
0.90
0.91
0.92
0.88
-40
PEAK AND RUNAWAY CURRENT LIMIT
vs. TEMPERATURE
MAX17501 toc16
TEMPERATURE (°C)
CURRENT LIMIT (A)
100 120806040200-20
0.75
0.70
0.65
0.80
0.85
0.90
0.60
-40
PEAK
CURRENT
LIMIT
RUNAWAY
CURRENT
LIMIT
SWITCHING FREQUENCY
vs. TEMPERATURE
MAX17501 toc17
TEMPERATURE (°C)
SWITCHING FREQUENCY (kHz)
100 120806040200-20
400
300
500
600
700
200
-40
NO-LOAD SOFT-START FROM EN/UVLO
(MAX17501A)
MAX17501 toc18
1ms/div
EN/UVLO
2V/div
VOUT
1V/div
RESET
2V/div
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MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
Typical Operating Characteristics (continued)
(VIN = 24V, VGND = VPGND = 0V, CVIN = CVCC=1μF,VEN = 1.5V, CSS = 3300pF, VFB = 0.98 x VOUT, LX = unconnected, RESET =
unconnected, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA=+25°C.AllvoltagesarereferencedtoGND,
unless otherwise noted.)
NO-LOAD SOFT-START FROM EN/UVLO
(MAX17501B)
MAX17501 toc19
1ms/div
EN/UVLO
2V/div
VOUT
2V/div
RESET
5V/div
FULL-LOAD SOFT-START/SHUTDOWN FROM EN/UVLO
(MAX17501E)
MAX17501 toc20
1ms/div
EN/UVLO
2V/div
VOUT
1V/div
IOUT
200mA/div
RESET
2V/div
FULL-LOAD SOFT-START/SHUTDOWN FROM EN/UVLO
(MAX17501F)
MAX17501 toc21
1ms/div
EN/UVLO
2V/div
VOUT
2V/div
IOUT
200mA/div
RESET
5V/div
NO-LOAD SOFT-START FROM VIN
(MAX17501A)
MAX17501 toc22
400µs/div
VIN
20V/div
VOUT
1V/div
RESET
2V/div
NO-LOAD SOFT-START FROM VIN
(MAX17501B)
MAX17501 toc23
400µs/div
VIN
20V/div
VOUT
2V/div
RESET
5V/div
FULL-LOAD SOFT-START FROM VIN
(MAX17501E)
MAX17501 toc24
400µs/div
VIN
20V/div
VOUT
1V/div
IOUT
200mA/div
RESET
2V/div
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MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
Typical Operating Characteristics (continued)
(VIN = 24V, VGND = VPGND = 0V, CVIN = CVCC=1μF,VEN = 1.5V, CSS = 3300pF, VFB = 0.98 x VOUT, LX = unconnected, RESET =
unconnected, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA=+25°C.AllvoltagesarereferencedtoGND,
unless otherwise noted.)
FULL-LOAD SOFT-START FROM VIN
(MAX17501F)
MAX17501 toc25
400µs/div
VIN
20V/div
VOUT
2V/div
IOUT
200mA/div
RESET
5V/div
SOFT-START WITH 2V PREBIAS
(MAX17501A)
MAX17501 toc26
400µs/div
EN/UVLO
2V/div
VOUT
1V/div
RESET
2V/div
SOFT-START WITH 2.5V PREBIAS
(MAX17501B)
MAX17501 toc27
400µs/div
EN/UVLO
2V/div
VOUT
1V/div
RESET
5V/div
SOFT-START WITH 2V PREBIAS
(MAX17501E)
MAX17501 toc28
400µs/div
EN/UVLO
2V/div
VOUT
1V/div
RESET
2V/div
SOFT-START WITH 2.5V PREBIAS
(MAX17501F)
MAX17501 toc29
400µs/div
EN/UVLO
2V/div
VOUT
1V/div
RESET
5V/div
LOAD TRANSIENT RESPONSE OF MAX17501A
(LOAD CURRENT STEPPED FROM 5mA TO 255mA)
MAX17501 toc30
200µs/div
VOUT (AC)
100mV/div
IOUT
100mA/div
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MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
Typical Operating Characteristics (continued)
(VIN = 24V, VGND = VPGND = 0V, CVIN = CVCC=1μF,VEN = 1.5V, CSS = 3300pF, VFB = 0.98 x VOUT, LX = unconnected, RESET =
unconnected, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA=+25°C.AllvoltagesarereferencedtoGND,
unless otherwise noted.)
LOAD TRANSIENT RESPONSE OF MAX17501B
(LOAD CURRENT STEPPED FROM 5mA TO 255mA)
MAX17501 toc31
200µs/div
VOUT (AC)
100mV/div
IOUT
100mA/div
LOAD TRANSIENT RESPONSE OF MAX17501E
(LOAD CURRENT STEPPED FROM NO-LOAD TO 250mA)
MAX17501 toc32
20µs/div
VOUT (AC)
50mV/div
IOUT
100mA/div
LOAD TRANSIENT RESPONSE OF MAX17501F
(LOAD CURRENT STEPPED FROM NO-LOAD TO 250mA)
MAX17501 toc33
20µs/div
VOUT (AC)
100mV/div
IOUT
100mA/div
LOAD TRANSIENT RESPONSE OF MAX17501F
(LOAD CURRENT STEPPED FROM 250mA TO 500mA)
MAX17501 toc35
20µs/div
VOUT (AC)
100mV/div
IOUT
200mA/div
LOAD TRANSIENT RESPONSE OF MAX17501E
(LOAD CURRENT STEPPED FROM 250mA TO 500mA)
MAX17501 toc34
20µs/div
VOUT (AC)
50mV/div
IOUT
200mA/div
SWITCHING WAVEFORMS OF MAX17501F
AT 500mA LOAD
MAX17501 toc36
2µs/div
VOUT (AC)
50mV/div
ILX
500mA/div
LX
10V/div
Maxim Integrated
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MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
Typical Operating Characteristics (continued)
(VIN = 24V, VGND = VPGND = 0V, CVIN = CVCC=1μF,VEN = 1.5V, CSS = 3300pF, VFB = 0.98 x VOUT, LX = unconnected, RESET =
unconnected, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA=+25°C.AllvoltagesarereferencedtoGND,
unless otherwise noted.)
SWITCHING WAVEFORMS OF MAX17501A
AT 15mA LOAD
MAX17501 toc37
10µs/div
VOUT (AC)
100mV/div
ILX
100mA/div
LX
10V/div
OUTPUT OVERLOAD PROTECTION
OF MAX17501F
MAX17501 toc38
20ms/div
VOUT
2V/div
IOUT
200mA/div
BODE PLOT OF MAX17501E
AT 500mA LOAD
MAX17501 toc39
fCR = 51kHz
PM = 55°
456789
12
BODE PLOT OF MAX17501F
AT 500mA LOAD
MAX17501 toc40
fCR = 49.8kHz
PM = 62°
456789
12
MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
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Pin Description
Pin Conguration
PIN NAME FUNCTION
1PGND PowerGround.ConnectPGNDexternallytothepowergroundplane.ConnectGNDandPGNDpins
together at the ground return path of the VCC bypass capacitor.
2 VIN Power-Supply Input. The input supply range is from 4.5V to 60V.
3 EN/UVLO
Enable/Undervoltage Lockout Input. Drive EN/UVLO high to enable the output voltage. Connect to the
center of the resistive divider between VINandGNDtosettheinputvoltage(undervoltagethreshold)at
which the device turns on. Pull up to VIN for always on.
4 VCC 5VLDOOutput.BypassVCCwith1µFceramiccapacitancetoGND.
5FB/VO FeedbackInput.Forxedoutputvoltagedevices,directlyconnectFB/VOtotheoutput.Foradjustable
outputvoltagedevices,connectFB/VOtothecenteroftheresistivedividerbetweenVOUTandGND.
6 SS Soft-StartInput.ConnectacapacitorfromSStoGNDtosetthesoft-starttime.
7 N.C./COMP Forxedoutputvoltagedevices,leave this pinunconnected.Foradjustableoutput voltage devices,
connectanRCnetworkfromCOMPtoGND.
8RESET
Open-Drain RESET Output. The RESEToutputisdrivenlowifFBdropsbelow92.5%ofitssetvalue.
RESETgoeshigh1024clockcyclesafterFBrisesabove95.5%ofitssetvalue.RESET is valid when
the device is enabled and VIN is above 4.5V.
9GND AnalogGround
10 LX Switching Node. Connect LX to the switching side of the inductor. LX is high impedance when the device
is in shutdown mode.
— EP ExposedPad.ConnecttotheGNDpinoftheIC.ConnecttoalargecopperplanebelowtheICtoimprove
heat dissipation capability.
TOP VIEW
*EP = EXPOSED PAD. CONNECT TO GND
TDFN
(3mm x 2mm)
MAX17501
1
2
3
4
5
PGND
VIN
EN/UVLO
VCC
FB/VO
LX
GND
RESET
N.C./COMP
SS
+
EP*
10
9
8
7
6
MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
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Block Diagram
PGND
LX
VIN
VCC LDO
SLOPE
COMPENSATION
START
RESET
LOGIC
REFERENCE
SWITCHOVER
LOGIC
COMP
CURRENT
SENSE
P DRIVER
PWM, PFM
LOGIC
GM
GND
INTERNAL
COMPENSATION
(FOR A, B, E, F VERSIONS)
N DRIVER
VCC
5µA
SS
RESET
N.C./COMP
SS
HICCUP
COMP
HICCUP
CLK OSC
PWM
COMPARATOR
EN
SS
900mV
FB
MAX17501
MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
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│
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Detailed Description
The MAX17501 synchronous step-down regulator oper-
ates from 4.5V to 60V and delivers up to 500mA load
current. Output voltage regulation accuracy meets ±1.7%
over temperature.
The device uses a peak-current-mode control scheme.
An internal transconductance error amplifier generates an
integrated error voltage. The error voltage sets the duty
cycle using a PWM comparator, a high-side current-sense
amplifier, and a slope-compensation generator. At each
rising edge of the clock, the high-side p-channel MOSFET
turns on and remains on until either the appropriate or
maximum duty cycle is reached, or the peak current limit
is detected.
During the high-side MOSFET’s on-time, the inductor
current ramps up. During the second half of the switching
cycle, the high-side MOSFET turns off and the low-side
n-channel MOSFET turns on and remains on until either
the next rising edge of the clock arrives or sink current
limit is detected. The inductor releases the stored energy
as its current ramps down, and provides current to the
output (the internal low RDSON pMOS/nMOS switches
ensure high efficiency at full load).
This device also integrates enable/undervoltage lockout
(EN/UVLO), adjustable soft-start time (SS), and open-
drain reset output (RESET) functionality.
PFM Operation
TheA andBversionsoftheMAX17501feature aPFM
scheme to improve light load efficiency. At light loads,
once the part enters PFM mode, the inductor current is
forced to a fixed peak of 125mA (typical) every clock cycle
until the output rises to 103.3% of nominal voltage. Once
output reaches 103.3% of nominal voltage, both high-
side and low-side FETs are turned off and the part enters
hibernate operation until the load discharges output to
101.3% of nominal voltage. Most of the internal blocks
are turned off in hibernate operation to save quiescent
current. Such an operation reduces the effective switch-
ing frequency of the converter at light loads, resulting in
reduced switching losses and improved light load effi-
ciency. The part naturally exits PFM mode when the load
current exceeds 62.5mA (typical).
Linear Regulator (VCC)
An internal linear regulator (VCC) provides a 5V nominal
supply to power the internal blocks and the low-side
MOSFET driver. The output of the VCC linear regulator
should be bypassed with a 1μF ceramic capacitor to
GND.Thedeviceemploysanundervoltage-lockoutcircuit
that disables the internal linear regulator when VCC falls
below 3.7V (typical). The internal VCC linear regulator can
source up to 40mA (typical) to supply the device and to
power the low-side gate driver.
Operating Input Voltage Range
The maximum operating input voltage is determined by
the minimum controllable on-time and the minimum oper-
ating input voltage is determined by the maximum duty
cycle and circuit voltage drops. The minimum and maxi-
mum operating input voltages for a given output voltage
should be calculated as:
OUT OUT(MAX) DCR
IN(MIN) MAX
OUT(MAX)
V (I (R 0.47))
VD
(I 0.73)
+ ×+
=
+×
=×
OUT
IN(MAX) SW (MAX) ON(MIN)
V
Vft
where VOUT is the steady-state output voltage, IOUT(MAX)
isthemaximumloadcurrent,RDCR is the DC resistance
of the inductor, fSW(MAX) is the switching frequency (max-
imum) and tON(MIN) is the worst-case minimum switch
on-time (120ns). The following table lists the fSW(MAX)
and DMAX values to be used for calculation for different
versions of the MAX17501:
Overcurrent Protection/HICCUP Mode
The device is provided with a robust overcurrent-pro-
tection 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
760mA (typ). A runaway current limit on the high-side
switch current at 780mA (typ) protects the device under
high input voltage, short-circuit conditions when there is
insufficient output voltage available to restore the inductor
current that 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 to a fault condi-
tion, output voltage drops to 71.14% (typ) of its nominal
value any time after soft-start is complete, hiccup mode
is triggered.
PART VERSION fSW (MAX) (kHz) DMAX
MAX17501A/B/E/F/G 640 0.92
MAX17501H 320 0.965
MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
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In hiccup mode, the converter is protected by suspend-
ing switching for a hiccup timeout period of 32,768 clock
cycles. Once the hiccup timeout period expires, soft-start
is attempted again. This operation results in minimal
power dissipation under overload fault conditions.
RESET Output
The device includes a RESET comparator to monitor the
output voltage. The open-drain RESET output requires
an external pullup resistor. RESET can sink 2mA of cur-
rent while low. RESET goes high (high impedance) 1024
switching cycles after the regulator output increases
above 95.5% of the designated nominal regulated volt-
age. RESET goes low when the regulator output voltage
drops to below 92.5% of the nominal regulated voltage.
RESET also goes low during thermal shutdown. RESET
is valid when the device is enabled and VIN is above 4.5V.
Prebiased Output
When the device starts into a prebiased output, both the
high-side and low-side switches are turned off so the
converter does not sink current from the output. High-
side and low-side switches do not start switching until
the PWM comparator commands the first PWM pulse, at
which point switching commences first with the high-side
switch. The output voltage is then smoothly ramped up to
the target value in alignment with the internal reference.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipa tion
in the device. When the junction temperature of the device
exceeds +165°C, an on-chip thermal sensor shuts down
the device, allowing the device to cool. The thermal sensor
turns the device on again after the junc tion temperature
cools by 10°C. Soft-start resets during thermal shutdown.
Carefully evaluate the total power dissipation (see the
Power Dissipation section) to avoid unwanted triggering of
the thermal-overload protection in normal operation.
Applications Information
Input Capacitor Selection
The discontinuous input-current waveform of the buck
converter causes large ripple currents in the input capaci-
tor. The switching frequency, peak inductor cur rent, and
the allowable peak-to-peak voltage ripple that reflects
back to the source dictate the capacitance requirement.
The device’s high switching frequency allows the use of
smaller value input capacitors. X7R capacitors are rec-
ommended in industrial applications for their temperature
stability.Aminimumvalueof1μFshouldbeusedforthe
inputcapacitor.Highervalueshelpreducetherippleon
the input DC bus further. In applications where the source
is located distant from the device input, an electrolytic
capacitorshouldbeaddedinparalleltothe1μFceramic
capacitor to provide necessary damping for potential
oscillations caused by the longer input power path and
input ceramic capacitor.
Inductor Selection
Three key inductor parameters must be specified for
operation with the device: inductance value (L), inductor
saturation current (ISAT),andDCresistance(RDCR). The
switching frequency, input voltage, and output voltage
determine the inductor value as follows:
×
=××
OUT IN OUT
IN SW
V (V - V )
L0.15 V f
where VIN, VOUT, and fSW are nominal values. Ensure
that at any operating condition, the ratio (VOUT/(L x fSW))
is between 150mA and 250mA.
Select a low-loss inductor closest to the calculated value
with acceptable dimensions and having the lowest pos-
sible DC resistance. The saturation current rating (ISAT)
of the inductor must be high enough to ensure that satu-
ration can occur only above the peak current-limit value
(IPEAK-LIMIT (typ) = 0.76A for the device).
Output Capacitor Selection
X7Rceramicoutputcapacitorsarepreferredduetotheir
stability over temperature in industrial applications. The
output capacitor is usually sized to support a step load
of 50% of the maximum output current in the application,
so the output-voltage deviation is contained to ±3% of the
output-voltage change.
For fixed 3.3V and 5V output voltage versions, connect
a minimum of 10μF (1206) capacitor at the output. For
adjustable output voltage versions, the output capaci-
tance can be calculated as follows:
×
= × ∆
STEP RESPONSE
OUT OUT
It
1
C2V
≅+
RESPONSE C SW
0.33 1
tff
where ISTEP is the load current step, tRESPONSE is the
response time of the controller, ΔVOUT is the allowable
output-voltage deviation, fC is the target closed-loop cross-
over frequency, and fSW is the switching frequency. Select
fC to be 1/12th of fSW. Consider DC bias and aging effects
while selecting the output capacitor.
MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
www.maximintegrated.com Maxim Integrated
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Figure 1. Setting the Output Voltage Figure 2. Adjustable EN/UVLO Network
Soft-Start Capacitor Selection
The MAX17501 implements adjustable soft-start opera-
tion to reduce inrush current. A capacitor con nected from
theSSpintoGNDprogramsthesoft-startperiod.
The soft-start time (tSS) is related to the capacitor con-
nected at SS (CSS) by the following equation:
SS SS
C 5.55 t= ×
where tSS is in milliseconds and CSS is in nanofarads. For
example, to program a 600μs soft-start time, a 3300pF
capacitorshouldbeconnectedfromtheSSpintoGND.
Ensure that (CSEL x VOUT/tSS) is less than 150mA,
where CSEL is the selected output capacitance.
Adjusting Output Voltage
TheMAX17501A/EandMAX17501B/Fhavepresetout-
putvoltagesof3.3Vand5.0V,respectively.ConnectFB/
VO directly to the positive terminal of the output capacitor
(see the Typical Applications Circuits).
The MAX17501G/H offer an adjustable output voltage.
Set the output voltage with a resistive voltage-divider con-
nected from the positive terminal of the output capacitor
(VOUT)toGND(seeFigure 1). Connect the center node
ofthedividertoFB/VO.Tooptimizeefficiencyandoutput
accuracy, use the following procedure to choose the val-
uesofR4andR5:
For MAX17501G, select the parallel combination of R4
andR5,Rptobelessthan15kΩ.FortheMAX17501H,
selecttheparallelcombination of R4 and R5, Rp to be
lessthan30kΩ.OnceRpisselected,calculateR4as:
OUT
Rp V
R4 0.9
×
=
CalculateR5asfollows:
OUT
R4 0.9
R5 (V - 0.9)
×
=
Setting the Input Undervoltage Lockout Level
The device offers an adjustable input undervoltage-
lockout level. Set the voltage at which the device turns
on with a resistive voltage-divider connected from VIN
toGND(seeFigure 2). Connect the center node of the
divider to EN/UVLO.
ChooseR1tobe3.3MΩ,andthencalculateR2as:
INU
R1 1.218
R2 (V - 1.218)
×
=
where VINU is the voltage at which the device is required
to turn on. For adjustable output voltage devices, ensure
that VINU is higher than 0.8 x VOUT.
R5
R4
FB/VO
GND
VOUT
R2
R1
EN/UVLO
GND
VIN
MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
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Figure 3. External Compensation Network
External Loop Compensation for Adjustable
Output Versions
The MAX17501 uses peak current-mode control scheme
andneeds only a simple RC networkto have a stable,
high-bandwidth control loop for the adjustable output volt-
age versions. The basic regulator loop is modeled as a
power modulator, an output feedback divider, and an error
amplifier.Thepower modulatorhasDC gainGMOD(dc),
withapoleandzeropair.Thefollowingequationdefines
the power modulator DC gain:
=

++

×

MOD(dc)
LOAD IN SW SEL
1
G1 0.2 0.5 - D
R VfL
where RLOAD = VOUT/IOUT(MAX), fSW is the switching
frequency, LSEL is the selected output inductance, D is
the duty ratio, D = VOUT/VIN.
The compensation network is shown in Figure 3.
RZ can be calculated as:
Z C SEL OUT
R 12000 f C V= ×× ×
whereRZisinΩ.ChoosefC to be 1/12th of the switching
frequency.
CZ can be calculated as follows:
SEL MOD(dc)
ZZ
CG
CR
×
=
CP can be calculated as follows:
=π× ×
PZ SW
1
C - 5pF
Rf
Power Dissipation
The exposed pad of the IC should be properly soldered to
thePCBtoensuregoodthermalcontact.Ensurethejunction
temperature of the device does not exceed +125°C under
the operating conditions specified for the power supply.
At high ambient temperatures, based on the operating
condition, the heat dissipated in the IC might exceed
themaximumjunctiontemperatureof+125°C.Heatsink
shouldbeused to reduce θJA at such operating condi-
tions. For typical applications, refer to the temperature
derating curves included in the MAX17501 Evaluation Kit
data sheet.
To prevent the part from exceeding 125°C junction tem-
perature, users need to do some thermal analysis. At a
particular operating condition, the power losses that lead
to temperature rise of the device are estimated as follows:
()
2
LOSS OUT DCR
OUT
1
P (P ( - 1)) - I R
=××
η
OUT OUT OUT
P VI
= ×
where POUTistheoutputpower,ηisistheefficiencyof
thedevice,andRDCR is the DC resistance of the output
inductor (refer to the Typical Operating Characteristics
in the evaluation kit data sheets for more information on
efficiency at typical operating conditions).
The maximum power that can be dissipated in the 10-pin
TDFN-EP package is 1188.7mW at +70°C temperature.
The power dissipation capability should be derated as
the temperature goes above +70°C at 14.9mW/°C. For a
typical multilayer board, the thermal performance metrics
for the package are given as:
JA 67.3 C Wθ= °
JC 18.2 C Wθ= °
The junction temperature of the device can be estimated
at any given maximum ambient temperature (TA_MAX)
from the following equation:
( )
J_MAX A_MAX JA LOSS
TT P= +θ ×
If the application has a thermal-management system that
ensures that the exposed pad of the device is maintained
at a given temperature (TEP_MAX) by using proper heat
sinks, then the junction temperature of the device can be
estimated at any given maximum ambient temperature as:
( )
J_MAX EP_MAX JC LOSS
TT P= +θ ×
RZ
TO COMP PIN
CZ
CP
MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
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PCB Layout Guidelines
CarefulPCBlayoutiscriticaltoachievelowswitchingloss-
es and stable operation. For a sample layout that ensures
first-pass success, refer to the MAX17501 evaluation kit
layouts available at www.maximintegrated.com. Follow
theseguidelinesforgoodPCBlayout:
1) All connections carrying pulsed currents must be very
short and as wide as possible. The loop area of these
connections must be made very small to reduce stray
inductance and radiated EMI.
2) A ceramic input filter capacitor should be placed close
to the VIN pin of the device. The bypass capacitor for
the VCC pin should also be placed close to the VCC
pin. External compensation components should be
placed close to the IC and far from the inductor. The
feedback trace should be routed as far as possible
from the inductor.
3) The analog small-signal ground and the power ground
for switch ing currents must be kept separate. They
should be connected together at a point where switch-
ing activity is at minimum, typically the return terminal
of the VCC bypass capacitor. The ground plane should
be kept continuous as much as possible.
4) A number of thermal vias that connect to a large
ground plane should be provided under the exposed
pad of the device, for efficient heat dissipation.
Figure 4 and 5 show the recommended component place-
ment for MAX17501.
Figure 4. Recommended Component Placement for MAX17501A/B/E/F
EP
R4
C2
C1
R2
R1
VIN PLANE
PGND PLANE
GND PLANE
VIAS TO BOTTOM SIDE PGND PLANE
VIAS TO BOTTOM SIDE VOUT TRACK
VIAS TO BOTTOM SIDE GND PLANE
L1
VOUT PLANE
LX PLANE
C3
RESET
C4
MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
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Figure 5. Recommended Component Placement for MAX17501G/H
EP
R4
R5
C2
C1
R2
R1
VIN PLANE
PGND PLANE
GND PLANE
L1
VOUT PLANE
LX PLANE
C3 C9 C5
R3
RESET
VIAS TO BOTTOM SIDE PGND PLANE
VIAS TO BOTTOM SIDE VOUT TRACK
VIAS TO BOTTOM SIDE GND PLANE
C4
MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
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Typical Applications Circuits
Figure 6. MAX17501A/E Application Circuit (3.3V Output, 500mA Maximum Load Current, 600kHz Switching Frequency)
Figure 7. MAX17501B/F Application Circuit (5V Output, 500mA Maximum Load Current, 600kHz Switching Frequency)
C2
1µF
C3
3300pF
N.C.
SS
VCC
EN/UVLO
VIN LX
PGND
GND
FB/VO
RESET
VIN
24V C1
1µF
1206 1
2JU1
R1
3.32MΩ
R2
866kΩ
3
MAX17501
RESET
L1
33µH
C4
10µF,
1206
VOUT
3.3V, 500mA
C2
1µF
C3
3300pF
N.C.
SS
VCC
EN/UVLO
VIN LX
PGND
GND
FB/VO
RESET
VIN
24V C1
1µF
1206 1
2JU1
R1
3.32MΩ
R2
866kΩ
3
MAX17501
RESET
L1
47µH
C4
10µF,
1206
VOUT
5V, 500mA
MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
www.maximintegrated.com Maxim Integrated
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20
Figure 8. MAX17501G Application Circuit (12V Output, 500mA Maximum Load Current, 600kHz Switching Frequency)
Figure 9. MAX17501H Application Circuit (2.5V Output, 500mA Maximum Load Current, 300kHz Switching Frequency)
C2
1µF
C3
6800pF
R3
27.4kΩ
C5
1200pF
C9
10pF
COMP
SS
VCC
EN/UVLO
VIN LX
PGND
GND
FB/VO
RESET
VIN
24V C1
1µF
1206 1
2JU1
R1
3.32MΩ
R2
316kΩ
3
MAX17501
RESET
L1
100µH
C4
4.7µF,
1206
VOUT
12V, 500mA
R4
174kΩ
R5
14kΩ
C2
1µF
C3
6800pF
R3
20kΩ
C5
2200pF
C9
47pF
COMP
SS
VCC
EN/UVLO
VIN LX
PGND
GND
FB/VO
RESET
VIN
24V C1
2.2µF
1210 1
2JU1
R1
3.32MΩ
R2
1MΩ
3
MAX17501
RESET
L1
47µH
C4
22µF,
1210
VOUT
2.5V, 500mA
R4
69.8kΩ
R5
39.2kΩ
MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
www.maximintegrated.com Maxim Integrated
│
21
Package 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.
Chip Information
PROCESS:BiCMOS
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed paddle.
*EP = Exposed pad.
Ordering Information/Part Selector Guide
PART PIN-PACKAGE OUTPUT VOLTAGE (V) SWITCHING
FREQUENCY (kHz) MODE
MAX17501AATB+ 10 TDFN-EP* 3.3 600 PFM
MAX17501BATB+ 10 TDFN-EP* 5 600 PFM
MAX17501EATB+ 10 TDFN-EP* 3.3 600 PWM
MAX17501FATB+ 10 TDFN-EP* 5 600 PWM
MAX17501GATB+ 10 TDFN-EP* Adjustable 600 PWM
MAX17501HATB+ 10 TDFN-EP* Adjustable 300 PWM
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
10 TDFN T1032N+1 21-0429 90-0082
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 specications 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. © 2013 Maxim Integrated Products, Inc.
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MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 5/12 Initial release —
1 11/12 AddedMAX17501A,MAX17501B,MAX17501G,MAX17501Htodatasheet 1–22
2 1/13 Added explanation on detailed condition for RESET 11, 14
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.
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