MIC5281 120VIN, 25mA, Ultra-Low IQ, High-PSRR Linear Regulator General Description The MIC5281 high-performance linear regulator offers a very-wide input operating voltage range, up to 120V DC, and supplies an output current of up to 25mA. Ideal for high input voltage applications such as industrial and telecom, the MIC5281 offers 3% initial accuracy, extremely high-power supply rejection ratio (>90db) and ultra-low quiescent current of 6A. The MIC5281 is optimized for high-voltage line transients, making it ideal for harsh environment applications. The MIC5281 is offered in both fixed output voltage (3.3V/5.0V) and adjustable output voltage (1.27V to 5.5V) options. The MIC5281 operates over a -40C to +125C temperature range and is available in lead-free, RoHScompliant, 8-pin ePad MSOP and 8-pin MSOP packages. Data sheet and support documentation are found on the Micrel website: www.micrel.com. Features * * * * * * * * * Wide input voltage range: 6V to 120V DC Ultra-low quiescent current: 6A 25mA guaranteed output current Adjustable output from 1.27V to 5.5V Withstands up to +120V DC at the input Stable with ceramic capacitors Ultra-high PSRR >90dB Ultra-high line rejection (load dump) High output accuracy: - 3% initial accuracy * Thermal-shutdown and current-limit protection * Thermally-efficient, 8-pin MSOP and 8-pin ePad MSOP packages Applications * Industrial applications * Remote keyless entry power supply * Telecom applications * Off-line power supplies ___________________________________________________________________________________________________________ Typical Applications Quiescent Supply Current vs. Input Voltage 11.0 QUIESCENT CURRENT (A) 10.0 VOUT = 5V IOUT = 0 9.0 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 0 20 40 60 80 100 120 INPUT VOLTAGE (V) Micrel Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel +1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com June 2011 M9999-062411-A Micrel, Inc. MIC5281 Ordering Information Part Number Output Voltage Top Mark Temperature Range Package Lead Finish Adjustable 781A -40C to +125C 8-Pin ePad MSOP Pb-Free MIC5281-3.3YMME 3.3V 781S -40C to +125C 8-Pin ePad MSOP Pb-Free MIC5281-5.0YMME 5.0V 7815 -40C to +125C 8-Pin ePad MSOP Pb-Free Adjustable - -40C to +125C 8-Pin MSOP Pb-Free MIC5281-3.3YMM 3.3V - -40C to +125C 8-Pin MSOP Pb-Free MIC5281-5.0YMM 5.0V - -40C to +125C 8-Pin MSOP Pb-Free MIC5281YMME MIC5281YMM Pin Configuration June 2011 8-Pin ePAD MSOP MIC5281-x.xYMME 8-Pin MSOP MIC5281-x.xYMM (TOP VIEW) (TOP VIEW) 8-Pin ePAD MSOP MIC5281YMME 8-Pin MSOP MIC5281YMM (TOP VIEW) (TOP VIEW) 2 M9999-062411-A Micrel, Inc. MIC5281 Pin Description MIC5281YMME Pin MIC5281-x.xYMME MIC5281YMM MIC5281-x.xYMM Name Function 1 1 1 1 VIN Supply Voltage Input. Connect 1F capacitor from VIN to GND. 2, 3, 7 2, 3, 7 2, 3, 7 2, 3, 7 NC Not internally connected. Connect NC to GND or leave unconnected. 4 4 4 4 CPSRR 5 5 5 5 GND 6 - 6 - FB - 6 - 6 SNS 8 8 8 8 VOUT Regulator Output. Connect 10F capacitor from VOUT to GND. EP EP - - EP Exposed Pad (ePad) for Thermal Relief. Connect EP to GND. June 2011 3 Bypass Capacitor Connection. Connect 0.1F capacitor from CPSRR to GND. Ground. Feedback Connection. For external resistor divider to set VOUT. Sense input. Connect SNS to VOUT. M9999-062411-A Micrel, Inc. MIC5281 Absolute Maximum Ratings(1) Operating Ratings(2) VIN to GND................................................... -0.3V to +125V VCPSRR to GND..................................................-0.3 to +14V VFB, VSNS, VOUT to GND ................................... -0.3V to +6V Lead Temperature (soldering, 10s).......................... +260C Junction Temperature ......................... -40C TJ +125C Storage Temperature .........................-65C TA +150C ESD Ratings(4) HBM ......................................................................... 2kV MM .........................................................................200V VIN ................................................................. +6V to +120V VOUT Adjust Range ..................................... +1.27V to +5.5V Junction Temperature ......................... -40C TJ +125C Power Dissipation (PD)........................... Internally Limited(3) Junction Thermal Resistance (JA) 8-pin ePad MSOP..............................................64C/W 8-pin MSOP .....................................................160C/W Electrical Characteristics(5) VIN = 12V, CIN = 1.0F, CPSRR = 0.1F, COUT = 10F, VOUT = 5.0V or 3.3V, IOUT = 100A, TA = 25C, bold values indicate -40C TJ +125C, unless noted. Parameter Condition Min. Typ. Max. Units 120 V 6 11 A 3.2 3.3 3.4 3.13 3.3 3.47 4.85 5.0 5.15 4.75 5.0 5.25 Power Supply Input Input Voltage Range(6) Quiescent Supply Current 6 IOUT = 0 Output Voltage Adjustable 1.27 Fixed 3.3V Output Voltage Fixed 5.0V +3 % -5 +5 % 0.2 +0.5 % -0.5 0.04 +0.5 %/V 1.232 1.270 1.308 1.206 1.270 1.333 Variation from nominal VOUT Load Regulation IOUT = 100A to 25mA -0.5 VIN = 10V to 120V Line Regulation V -3 Output Voltage Accuracy (7) 5.5 Feedback Input (Adjustable) FB Voltage FB Current VFB = 1.27V 3.2 V nA Current Limit Current Limit 30 VOUT = 0V 65 130 mA Ripple Rejection Power Supply Rejection Ratio >90 f = 20kHz to 2MHz dB Notes: 1. Exceeding an absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. The maximum allowable power dissipation at any TA (ambient temperature) is PD(max) = (TJ(max) - TA) / JA. Exceeding the maximum allowable power dissipation results in excessive die temperature, and causes the regulator to enter thermal shutdown. 4. Devices are ESD sensitive; use proper handling precautions. 5. Specifications are for packaged products only. 6. Assure that VIN (VOUT + 3V) and VIN 6V. 7. Line regulation is a percentage of VOUT. June 2011 4 M9999-062411-A Micrel, Inc. MIC5281 Electrical Characteristics(5) (Continued) VIN = 12V, CIN = 1.0F, CPSRR = 0.1F, COUT = 10F, VOUT = 5.0V or 3.3V, IOUT = 100A, TA = 25C, bold values indicate -40C TJ +125C, unless noted. Parameter Condition Min. Typ. Max. Units 2 3 V Power Dropout Voltage Dropout Voltage IOUT = 25mA Thermal Protection Thermal-Shutdown Temperature TJ rising Thermal-Shutdown Hysteresis June 2011 5 157 C 15 C M9999-062411-A Micrel, Inc. MIC5281 Typical Characteristics IOUT = 0 9.0 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 9.0 IOUT = 0mA 8.0 7.0 6.0 5.0 4.0 3.0 2.0 VOUT = 5V 5.10 IOUT = 5mA 5.05 5.00 4.95 4.90 4.85 0.0 0 20 40 60 80 100 120 -50 -25 0 25 50 75 100 0 125 OUTPUT VOLTAGE (V) VOUT = 5V 5.15 5.10 5.05 5.00 4.95 4.90 VOUT = 5V 5.15 IOUT = 5mA 5.10 5.05 5.00 4.95 4.90 4.85 4.85 4.80 4.80 5 10 15 20 -50 25 -25 OUTPUT CURRENT (mA) 0 25 50 75 100 1.50 1.00 0.50 0 125 5 2.1 2.0 1.9 1.8 1.7 20 25 FB Current vs. Input Voltage VOUT = 5V 4.5 VOUT = 5V IOUT = 5mA 4.0 VFB = 1.267V FB CURRENT (nA) FB VOLTAGE (V) IOUT = 25mA 15 5.0 1.30 VOUT = 5V 10 OUTPUT CURRENT (mA) 1.31 2.2 2.00 FB Voltage vs. Input Voltage Dropout Voltage vs. Temperature 2.3 120 VOUT = 5V ADJUSTABLE OPTION 2.50 TEMPERATURE (C) 2.4 100 0.00 4.75 4.75 80 3.00 VIN = 12V 5.20 DROPOUT VOLTAGE (V) VIN = 12V 60 Dropout Voltage vs. Output Current 5.25 5.25 0 40 INPUT VOLTAGE (V) Output Voltage vs. Temperature Output Voltage vs. Output Current 5.20 20 TEMPERATURE (C) INPUT VOLTAGE (V) OUTPUT VOLTAGE (V) VIN = 12V VOUT = 5V 1.0 0.0 DROPOUT VOLTAGE (V) Output Voltage vs. Input Voltage 5.15 VIN = 12V 10.0 VOUT = 5V QUIESCENT CURRENT (A) QUIESCENT CURRENT (A) 10.0 Quiescent Supply Current vs. Temperature 11.0 OUTPUT VOLTAGE (V) Quiescent Supply Current vs. Input Voltage 11.0 1.29 1.28 1.27 1.26 1.25 3.5 3.0 2.5 2.0 1.5 1.0 1.6 1.24 1.5 0.5 1.23 1.4 -50 -25 0 25 50 75 TEMPERATURE (C) June 2011 100 125 0.0 0 20 40 60 80 INPUT VOLTAGE (V) 6 100 120 0 20 40 60 80 100 120 INPUT VOLTAGE (V) M9999-062411-A Micrel, Inc. MIC5281 Typical Characteristics (Continued) 2.5 1.31 1.276 VIN = 12V FB CURRENT (nA) IOUT = 5mA 1.29 VIN = 12V VIN = 12V 2.0 VOUT = 5V 1.28 1.27 1.26 VOUT = 5.0V 1.274 VFB = 1.267V FB VOLTAGE (V) 1.30 FB VOLTAGE (V) FB Voltage vs. Output Current FB Current vs. Temperature FB Voltage vs. Temperature IOUT = 0 1.5 1.0 1.272 1.270 1.268 0.5 1.25 1.24 1.266 0.0 -50 -25 0 25 50 75 100 125 -50 -25 0 TEMPERATURE (C) 75 100 0 125 VOUT = 0V 70 65 60 55 VOUT = 5V IOUT = 100A 0.30 0.25 0.20 0.15 0.10 0.05 -50 -25 0 25 50 75 100 -25 0 25 50 75 100 TEMPERATURE (C) TEMPERATURE (C) Power Dissipation vs. Output Current Case Temperature (MME) vs. Output Current 125 V IN = 12V 0.16 V OUT = 4.5V 0.14 0.12 0.10 0.08 0.06 VIN = 12V 0.26 VOUT = 5V IOUT =100A to 25mA 0.24 0.22 0.20 0.18 0.16 0.14 V OUT = 4.5V 36 -10 34 -30 32 30 -110 OUTPUT CURRENT (mA) June 2011 25 125 0 5 10 15 20 OUTPUT CURRENT (mA) 7 25 VOUT = 5V IOUT = 5mA CIN = None CPSRR = 0.1F -70 24 20 100 -50 0.00 15 75 COUT = 10F 0.02 10 50 VIN = 12V 10 -90 5 25 30 V IN = 12V 38 26 0 0 PSRR vs. Frequency 28 0.04 -25 TEMPERATURE (C) PSRR (dB) CASE TEMPERATURE (C) 0.18 0.28 -50 40 0.20 25 0.10 -50 125 20 0.12 0.00 50 15 0.30 VIN = 10V to 120V 0.35 LOAD REGULATION (%) LINE REGULATION (%/V) VIN = 12V 10 Load Regulation vs. Temperature 0.40 75 5 OUTPUT CURRENT (mA) Line Regulation vs. Temperature 80 CURRENT LIMIT (mA) 50 TEMPERATURE (C) Current Limit vs. Temperature POWER DISSIPATION (W) 25 -130 0.01 0.1 1 10 100 1000 10000 FREQUENCY (kHz) M9999-062411-A Micrel, Inc. MIC5281 Functional Characteristics June 2011 8 M9999-062411-A Micrel, Inc. MIC5281 Functional Characteristics (Continued) June 2011 9 M9999-062411-A Micrel, Inc. MIC5281 Detailed Description The MIC5281 voltage regulator accepts a 6V to 120V input and has an ultra-low 6A typical quiescent current while offering an excellent line transient response and PSRR. These features make it ideal for harsh, noisy environments. All options of the device offer 25mA of output current. The MIC5281YMM and MIC5281YMME offer an adjustable output voltage from 1.27V to 5.5V. The MIC5281-3.3YMME and MIC5281-3.3YMM offer fixed 3.3V outputs and the MIC5281-5.0YMME and MIC52815.0YMM offer fixed 5.0V outputs. The YMME packaged devices feature a heat slug to more effectively remove heat from the die. Applications Information Thermal Protection MIC5281 has internal thermal shutdown to protect it from excessive heating of the die. When the junction temperature exceeds approximately +155C, the output is disabled and the device begins to cool down. The device turns back on when the junction temperature cools by 15C. This will result in a cycled output during continuous thermal-overload conditions. Current Limit MIC5281 features output current-limit protection. The output sustains a continuous short circuit to GND without damage to the device, but thermal shutdown often results. Input Capacitor Connect a 1.0F capacitor from VIN to GND. Micrel recommends the C5750X7R2E105M, 1.0F, 250V capacitor made by TDK. When using a different capacitor, assure that the voltage rating of the capacitor exceeds any potential transient. CPSRR Capacitor Connect a 0.1F capacitor from CPSRR to GND to maintain high power supply rejection. The voltage rating of the capacitor must be at least 14V. Output Capacitor Connect a 10F capacitor from VOUT to GND. Assure that the voltage rating of the capacitor exceeds the designed output voltage of the MIC5281. June 2011 Output Voltage Setting For the MIC5281YMME and MIC5281YMM, VOUT is programmed from 1.27V to 5.5V using: R1 VOUT = VREF x + 1 R2 where VREF = 1.267V, and R1 and R2 are shown in the Typical Applications circuit. Thermal Measurements It is always wise to measure an IC's case temperature to make sure that it is within operating limits, but it is easy to get erroneous results. The standard thermal couple that comes with many voltage meters uses a large wire gauge that behaves like a heat-sink, resulting in artificially low case temperature measurements. Use a thermocouple of 36-gauge wire or smaller, such as the Omega (5SC-TT-K36-36), to minimize the heat-sinking effect. Also, apply thermal compound to maximize heat transfer between the IC and the thermocouple. An infrared thermometer is a recommended alternative. The IR thermometer from Optris has a 1mm spot size, ideal for monitoring small surface mount packages. Also, the optional stand makes it easy to keep the beam on the IC for long periods of time. 10 M9999-062411-A Micrel, Inc. MIC5281 Functional Diagram June 2011 11 M9999-062411-A Micrel, Inc. MIC5281 MIC5281 Evaluation Board Schematic MIC5281 Evaluation Board Schematic June 2011 12 M9999-062411-A Micrel, Inc. MIC5281 Bill of Materials Item C1 C2 C3 C4 Part Number C5750X7R2E105M 08053C104KAT2A 0805ZD106KAT2A OPEN Manufacturer TDK(1) (2) AVX (2) AVX Panasonic(3) Qty. 1 0.1F 25V 20%, X5R capacitor (0805) 1 10F, 10V, 20%, X5R, capacitor (0805) 1 100F, 160V, 20% capacitor (ALU, 0.492"diameter can 0.197"lead spacing - Part # ECA-2CM101) 0 C5 OPEN Capacitor 0 R1 CRCW06030000F Vishay/Dale(4) 0, 1% resistor, 0603 1 R2 CRCW06032942F Vishay/Dale(4) 29.4k, 1% resistor, 0603 1 CRCW06031002F (4) 10.0k, 1% resistor, 0603 1 (4) 18.2k, 1%, resistor, 0603 1 (4) 30.1k, 1% resistor chip, 0603 1 (4) 69.8k, 1%, resistor, 0603 1 120VIN, 25mA, Ultra-Low IQ, High-PSRR Linear Regulator 1 R3 R4 R5 R6 U1 CRCW06031822F CRCW06033012F CRCW06036982F MIC5281YMME ANY Description 1.0F, 250V, 20%, X7R capacitor (2220) Vishay/Dale Vishay/Dale Vishay/Dale Vishay/Dale Micrel (5) Notes: 1. TDK: www.tdk.com. 2. AVX.: www.avx.com. 3. Panasonic: www.panasonic.com. 4. Vishay Tel: www.vishay.com. 5. Micrel, Inc.: www.micrel.com. June 2011 13 M9999-062411-A Micrel, Inc. MIC5281 PCB Evaluation Board Layout Top Layer Silk Screen Top Layer Traces June 2011 14 M9999-062411-A Micrel, Inc. MIC5281 PCB Evaluation Board Layout (Continued) Bottom Layer Traces Bottom Layer Silk Screen June 2011 15 M9999-062411-A Micrel, Inc. MIC5281 PCB Evaluation Board Layout (Continued) EV Board Dimensions June 2011 16 M9999-062411-A Micrel, Inc. MIC5281 Package Information 8-Pin MSOP June 2011 17 M9999-062411-A Micrel, Inc. MIC5281 Package Information (Continued) 8-Pin Exposed Pad (ePad) MSOP June 2011 18 M9999-062411-A Micrel, Inc. MIC5281 Recommended Landing Pattern 8-Pin MSOP June 2011 19 M9999-062411-A Micrel, Inc. MIC5281 Recommended Landing Pattern (Continued) 8-Pin Exposed Pad (ePad) MSOP Red circle indicates Thermal Via. Size should be .300mm - .350mm in diameter, 1.00mm pitch, and it should be connected to GND plane for maximum thermal performance. June 2011 20 M9999-062411-A Micrel, Inc. MIC5281 MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel's terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2011 Micrel, Incorporated. June 2011 21 M9999-062411-A