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TPS51125RGER

Dual 5A synchronous buck controller, 5-28V input, D-CAP mode, 24-VQFN

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Manufacturer Part：

TPS51125RGER

Package：

24-VQFN (4x4mm)

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Description

Product Overview

The TPS51125RGER from Texas Instruments is a dual-channel, 5A/5A synchronous step-down controller for notebook system power. It supports 5V to 28V input and features D-CAP mode for fast transient response, packaged in a 24-pin VQFN (4x4mm).

Key Specifications

Channels 2 (dual output)
Output Current 5A per channel
Input Voltage 5V to 28V
Output Voltage 0.75V to 5.5V
Switching Frequency 300kHz (CH1), 400kHz (CH2)
Topology Synchronous buck controller
Package 24-VQFN (4x4mm)
Operating Temperature -40 to +85 C

Features

  • D-CAP mode for fast transient response
  • No external compensation components required
  • Internal 5V LDO for MOSFET gate drive
  • Adaptive on-time control
  • Overcurrent protection with hiccup mode
  • Power good output per channel
  • Adjustable soft-start

Applications

  • Notebook PC system power
  • Dual-rail DDR memory power
  • Embedded system point-of-load
  • Industrial distributed power

The TPS51125RGER is a dual-channel synchronous step-down controller from Texas Instruments designed for notebook PC system power. Each channel supports up to 5A output current from a 5V to 28V input, with adjustable output voltage from 0.75V to 5.5V. The D-CAP mode control provides fast transient response without external compensation components, simplifying design. An internal 5V LDO supplies gate drive voltage for the external MOSFETs. Protection features include overcurrent with hiccup mode, undervoltage lockout, and thermal shutdown. Power good outputs per channel enable power sequencing.

The TPS51125RGER uses D-CAP (Direct Control with Adaptive on-time) mode control, which is a constant on-time architecture with input voltage feed-forward. The on-time is adjusted based on the input voltage to maintain approximately constant switching frequency. Each channel operates independently with its own feedback loop. The internal 5V LDO provides the gate drive voltage for the external N-channel MOSFETs in the synchronous buck power stage. The adaptive on-time controller compares the output voltage to the reference and triggers a new on-time when the output falls below the threshold, providing inherently stable operation without compensation components. Overcurrent protection monitors the low-side MOSFET voltage drop during the off-time.

Pin Name Function
1 VFB1 Channel 1 feedback voltage
2 COMP1 Channel 1 compensation (D-CAP: connect capacitor)
3 TRIP1 Channel 1 OCP setting
4 PGND1 Channel 1 power ground
5 DRVL1 Channel 1 low-side gate drive
6 VREG5 5V LDO output
7 DRVH1 Channel 1 high-side gate drive
8 SW1 Channel 1 switch node
9 PGND2 Channel 2 power ground
10 DRVL2 Channel 2 low-side gate drive
11 DRVH2 Channel 2 high-side gate drive
12 SW2 Channel 2 switch node
13 VFB2 Channel 2 feedback voltage
14 COMP2 Channel 2 compensation
15 TRIP2 Channel 2 OCP setting
16 PGOOD2 Channel 2 power good
17 EN2 Channel 2 enable
18 SS2 Channel 2 soft-start
19 PGOOD1 Channel 1 power good
20 EN1 Channel 1 enable
21 SS1 Channel 1 soft-start
22 VIN Input supply voltage
23 GND Analog ground
24 VREF Reference output (0.75V)
  • Notebook PC dual-rail DDR memory power (VDDQ + VTT)
  • Embedded system dual point-of-load converters from 12V/19V bus
  • Industrial distributed power with fast transient response requirements
  • Server and networking equipment dual-output power supply
Model Manufacturer Key Difference
TPS51124RGER TI Similar, different current rating
TPS51126RGER TI Higher current version
ISL95813 Renesas Dual buck controller, similar function
MP2940 MPS Dual buck controller, PMBus
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Tel / WhatsApp: +86 13760382860

Service & Packaging

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Contact Information

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Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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