EVQ2451-G-00A MPS | Alldatasheet

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Technical content

0.6A, 2MHz, 36V Step-Down Converter Evaluation Board EVQ2451-G-00A Rev. 1.0 www.MonolithicPower.com 1 4/1/2013 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. The Future of Analog IC Technology

DESCRIPTION

The EVQ2451-G-00A is an evaluation board for the MPQ2451, a fixed 2MHz frequency step- down switching regulator with an integrated internal high-side high voltage power MOSFET. The IC provides 0.6A output with current mode control for fast loop response and easy compensation. High power conversion efficiency over a wide load range is achieved by scaling down the switching frequency at light load condition to reduce the switching and gate driving losses. The soft-start function helps prevent inductor current runaway during startup and thermal shutdown provides reliable, fault tolerant operation. By switching at 2MHz, smaller value inductor and input/output capacitor can be used to lower down cost and save board space. ELECTRICAL SPECIFICATIONS Parameter Symbol Value Units Input Voltage V IN 8-36 V Output Voltage V OUT 5 V Output Current I OUT 0-0.6 A

FEATURES

  • Wide Operating Input Range
  • Fixed 2MHz Switching Frequency
  • 0.6A Output Current
  • Up to 90% Efficiency

APPLICATIONS

  • High Voltage Power Conversion
  • Automotive Systems
  • Industrial Power Systems
  • Distributed Power Systems
  • Battery Powered Systems All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. EVQ2451-G-00A EVALUATION BOARD 4.6cm x 4.6cm x 1.0cm Board Number MPS IC Number EVQ2451-G-00A MPQ2451-G Efficiency VOUT=5V 0.01 0.1 1 EFFICIENCY (%) OUTPUT CURRENT(A) VIN=12V VIN=8V VIN=12V VIN=24V VIN=36V

EVQ2451-G-00A – 0.6A, 2MHz, 36V STEP-DOWN CONVERTER EVQ2451-G-00A Rev. 1.0 www.MonolithicPower.com 2 4/1/2013 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. EVALUATION BOARD SCHEMATIC EN EN GND GND VOUT VIN VIN BST MPQ2451 SW FB 100k NS NS6 100nF B140 23.7k R3 33pF 100nFR2 124k NS R4 26.1k 100nF EVQ2451-G-00A BILL OF MATERIALS Qty Ref Value Description Package Manufacturer Manufacturer P/N 2 C1, C2 4.7 μF Ceramic Cap., 50V, 10%, X7R 1210 muRata GRM32ER71H475KA88L

3 C3,C6,

C7 0.1μF Ceramic Cap., 50V, 10%, X7R 0603 muRata GCJ188R71H104KA12D

2 C4, C8 NS

1 C5 10 μF Ceramic Cap., 16V, 10%, X7R 1206 muRata GRM31CR71C106KAC7L 1 D1 B140 Schottky Rect., 40V,1A SMA Diodes Inc B140-13-LF

2 D2, D3 NS

1 L1 3.3 μH Inductor, Idc=2.15A, Rdc=30mohm SMD 5x5mm Wurth WE-744043003 1 R1 23.7K Ω Film Res., 1% 0603 Yageo RC0603FR-0723K7KL 1 R2 124K Ω Film Res., 1% 0603 Yageo RC0603FR-07124KL

1 R3 NS

1 R4 26.1K Ω Film Res., 1% 0603 Yageo RC0603FR-0726K1KL 1 R5 100K Ω Film Res., 1% 0603 Yageo RC0603FR-07100KL 1 R6 0 Film Res., 5% 0603 Yageo RC0603JR-070RL

1 U1 MPQ2451DQ Power Led Driver QFN6L-

VIN, GND, VOUT, GND Power Test Point 2.3mm HZ China market

1 EN,

GND 3x2.54mm Test Point 3x2.54mm Sullins PCC03SAAN

EVQ2451-G-00A – 0.6A, 2MHz, 36V STEP-DOWN CONVERTER EVQ2451-G-00A Rev. 1.0 www.MonolithicPower.com 3 4/1/2013 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. EVB TEST RESULTS Current Limit vs. Junction Temperature Voltage Reference vs. Junction Temperature Frequency vs. Junction Temperature 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 -50 -25 0 25 50 75 100 125 0.780 0.785 0.790 0.795 0.800 0.805 0.810 -50 -25 0 25 50 75 100 125-50 -25 0 25 50 75 100 125 D=30% 1.80 1.85 1.90 1.95 2.00 2.05 2.10 2.15 2.20 Efficiency VOUT=5V 0.01 0.1 1 EFFICIENCY (%) OUTPUT CURRENT(A) VIN=12V VIN=8V VIN=12V VIN=24V VIN=36V

EVQ2451-G-00A – 0.6A, 2MHz, 36V STEP-DOWN CONVERTER NOTICE: The information in this document is subject to change wi thout notice. Users should warra nt and guarantee that third party Intellectual Property rights are not infringed upon w hen integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. EVQ2451-G-00A Rev. 1.0 www.MonolithicPower.com 5 4/1/2013 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. QUICK START GUIDE 1. Connect the positive terminal of the load to VO UT pins, and the negative terminal of the load to GND pins. 2. Preset the power supply output to 12V and turn off the power supply. 3. Connect the positive terminal of the power supply output to the VIN pin and the negative terminal of the power supply output to the GND pin. 4. Turn on the power supply. The EVQ2451 will automatically start up. 5. To use the Enable function, apply a digital input to the EN pin. Drive EN higher than 1.6V to turn on the regulator or less than 1.2V to turn it off. Note that floating the EN pin will turn it off. 6. An input under-voltage lockout (UVLO) function is implemented by the addition of a resistor divider (R4 and R6). The EN threshold is 1.2V (falling edge), so the input UVLO threshold is: R6UVLO = 1.2V 1+ The UVLO threshold is preset to 6V on this board. 7. To adjust the output voltage, change the values of R1 and R2. Generally, Choose R2 around 124kΩ for optimal transient response. For VFB=0.8V, R2=124kΩ, R1 can be determined by: OUT 99.2kΩ R1 = V- 0 . 8 V Please follow the application information on the MP2451 datasheet to recalculate/select compensation values, the inductor value and the output capacitor value if the output voltage needs to be reprogrammed.