1 Features

1• Smart Power Mode in Factory Default (Compatible

with TI Smart Power Stage CSD95378B and Pin-

for-Pin Equivalent to TPS40425 – Non-Smart

Power Mode in Factory Default)

• Single Supply Operation: 4.5 V to 20 V

• VOUT from 0.6 V

• Dual or Multi-Phase Synchronous Buck Controller

• Individual High-Speed AVS Interface

• Fast Transient Response

• Stackable up to Four Phases

– 2-, 3-, or 4-Phase Interleaved Phase Shifts

– Accurate Current Sharing

• PMBus Interface Capability

– Margining Up/Down with 2-mV Step

– Programmable Fault Limit and Response

– ±0.8% VOUT

– Accuracy Current Monitoring

– ±3°C External Temperature Monitoring In

Smart Power Mode

– Programmable UVLO ON/OFF Thresholds

– Programmable Soft-Start Time, Turn-On

Delay, and Turn-Off Delay

• On-Chip Non-Volatile Memory (NVM) to Store

Custom Configurations

• 0.6-V Reference Voltage with 0.5% Accuracy from

–40°C to 125°C

• Programmable ƒSW from 200 kHz to 1.5 MHz

• Supports Pre-biased Output

• Differential Remote Sensing

• Synchronization to an Extermal Clock

• OC/OV/UV/OT Fault Protection

• 40-Pin, 6 mm × 6 mm, QFN Package

2 Applications

• Wireless Infrastructure

• Switcher/Router Networking/Server/Storage

3 Description

The TPS40428 device is a PMBus, synchronous

buck, driverless controller. It operates in smart power

mode with factory default settings, and it can operate

in non-smart power mode after PMBus programing and power reboot. It can be configured for dual-

output or 2-phase operation. It is also stackable up to

4 phases to support load current as high as 120 A.

Interleaved phase shift for 2-. 3-, or 4-phases reduce the input and output ripples therefore reducing input

and output capacitance.

The wide input voltage range can support 5-V and

12-V intermediate supply buses. The 0.5% reference

voltage satisfies the need of precision voltage to the

modern ASICs.

Using the PMBus standard, the TPS40428 device

can program reference voltage, fault limit, UVLO threshold, soft-start time and turn-on and turn-off

delay.

In addition, the device implements an accurate

measurement system to monitor the output voltages,

currents and temperatures for individual channels.