1 Features
• Single Supply Operation: 4.5 V to 20 V
• Output Voltage from 0.6 V to 5.6 V
• Dual-output or Two-Phase Synchronous Buck
Controller
• PMBus™ Interface Capability
– Margining Up or Down with 2-mV Step
– Programmable Fault Limit and Response
– Output Voltage, Output Current Monitoring
– External Temperature Monitoring with 2N3904
Transistor
– Programmable UVLO ON and OFF Thresholds
– Programmable Soft-start Time and Turn-On
and Turn-Off Delay
• On-Chip Non-volatile Memory (NVM) to Store
Custom Configurations
• 180° Out-of-Phase to Reduce Input Ripple
• 600-mV Reference Voltage with ±0.5% Accuracy
from 0°C to 85°C
• Inductor DCR Current Sensing
• Programmable Switching Frequency: 200 kHz to
1 MHz
• Voltage Mode Control with Input Feed Forward
• Current Sharing for Multiphase Operation
• Supports Pre-biased Output
• Differential Remote Sensing
• External SYNC
• BPEXT Pin Boosts Efficiency by Supporting
External Bias Power Switch Over
• OC, OV, UV, and OT Fault Protection
• 40-Pin, 6 mm × 6 mm VQFN Package with 0.5-mm
Pitch
• 40-Pin, 5 mm × 5 mm WQFN Package with 0.4-
mm Pitch
• Create a Custom Design using the TPS40422
device with the WEBENCH® Power Designer

2 Applications
• Multiple Rail Systems
• Telecom Base Station
• Switcher/Router Networking
• Server and Storage System

3 Description
The TPS40422 is a dual-output PMBus protocol,
synchronous buck controller. It can be configured also
for a single, two-phase output.
The wide input range supports 5-V and 12-V
intermediate buses. The accurate reference voltage
satisfies the need of precision voltage to the modern
ASICs and potentially reduces the output capacitance.
Voltage mode control reduces noise sensitivity and
also ensures low duty ratio conversion.