TPS51125 Evaluation Module


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The TPS51125 is a cost effective, dual-synchronous buck controller targeted for notebook system power supply solutions. It provides 5V and 3.3V LDOs and requires few external components. The 270kHz VCLK output can be used to drive an external charge pump, generating gate drive voltage for the load switches without reducing the main converter's efficiency. The TPS51125 supports high-efficiency, fast transient response and provides a combined power-good signal. Out-of-Audio™ mode light-load operation enables low acoustic noise at much higher efficiency than conventional forced PWM operation. Adaptive on-time D-CAP™ control provides convenient and efficient operation. The part operates with supply input voltages ranging from 5.5V to 28V and supports output voltages from 2V to 5.5V. TPS51125EVM evaluation module is a high efficiency, dual synchronous buck converter providing 5V at 8A and 3.3V at 8A from 8V to 25V input.
Buck controllers (external switch)
TPS51125 Dual-synchronous, step-down controller with Out-of-Audio™ operation and 100-mA LDOs


N-channel MOSFET transistors
CSD17307Q5A 30V, N ch NexFET MOSFET™, single SON5x6, 12.1mOhm CSD17507Q5A 30V N-Channel High Side NexFET Power MOSFET with 20 Volt Vgs

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Evaluation board

TPS51125EVM – TPS51125 Evaluation Module

Simulation model

TPS51125 Unencrypted PSpice Average Model Package (Rev. B) – SLIM147B.ZIP (73KB)

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Technical documentation

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Type Title Date
* User guide Using the TPS51125 (Rev. A) Jul. 12, 2012
More literature TPS51125EVM EU Declaration of Conformity (DoC) Jan. 02, 2019
Datasheet TPS51125 Dual-Synchronous, Step-Down Controller With Out-of-Audio™ Operation and 100-mA LDOS for Notebook System Power datasheet (Rev. H) Jan. 05, 2015

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