98% Efficient 400W Adjustable Output Dual Phase Boost with Envelope Tracking Reference Design
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Key Document


PMP21112 is a dual-phase boost reference design utilizing the LM25112-Q1 controller for automotive applications. This design can operate from 9V to 16V. The design has an adjustable output of 16V to 40V and capable of sourcing 10A continuous current. LM25112-Q1 has a bypass function where Vin is equal or greater than the set output voltage, the device will bypass Vin via the high side sync FET. Output adjustment is achieved via a 3.3V PWM signal, by adjusting the duty cycle of the PWM signal from 10% to 90%, output will go from 40V to 16V respectively. This design is also capable of tracking a sine wave up to 500Hz without distortion and achieve less than 300us delay time between sine wave and the output voltage. Switching frequency is set to 150kHz, and a 4 layer PCB is used. Three 6.8mF, 65V rated electrolytic capacitors are used to damp the input supply’s wiring inductance for all test data taken on this test report.

  • Synchronous rectification to improve efficiency, 98% peak efficiency
  • Envelope tracking from 16V to 40Vout adjustment
  • Adjustable output capable of delivering 400W
  • Low BOM count and cost, compact solution size

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(Output Voltage 1)
(Output Voltage 2)
(Output Voltage 3)
(Output Voltage 4)
Vin (Min) (V)9999
Vin (Max) (V)16161616
Vout (Nom) (V)16203040
Iout (Max) (A)10101010
Output Power (W)160200300400
TopologyBoost- SynchronousBoost- SynchronousBoost- SynchronousBoost- Synchronous

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM25122-Q1  Automotive Grade, 3-42V Wide Vin, Synchronous Boost Controller with Multiphase Capability  Step-up (boost)  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM25122-Q1 Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 1722 21 Dec 2017
Design files (6)
Title Type Size (KB) Date
ZIP 509 21 Dec 2017
ZIP 1265 21 Dec 2017
PDF 1088 21 Dec 2017
PDF 187 21 Dec 2017
PDF 100 21 Dec 2017
PDF 200 21 Dec 2017

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