1 Features

1• Dual-Output or Two-Phase Synchronous Buck

Controller

• 180° Out-of-Phase Reduces Input Ripple

• Input Voltage Range: 3 V to 20 V

• Output Voltage Range: 0.6 V to 5.6 V

• Adjustable Frequency: 100 kHz to 1 MHz

• Bidirectional SYNC Pin With 0°/180° or 90°/270°

Phase Shift

• Voltage Mode Control With Input Feedforward

• Accurate Current Sharing for Two-Phase

Operation

• Individual Power Good Outputs

• Individual Enable and Programmable Soft Start,

With Pre-Bias Start-Up

• ±0.5%, 600-mV Reference

• Output UV/OV Protection and Input Undervoltage

Lockout

• Individual Overcurrent Limit Setting

• Hiccup Overcurrent Protection

• Accurate Inductor DCR or Resistive Current

Sensing

• Remote Sense for Two-Phase Applications

• Internal N-Channel FET Drivers

• Integrated Bootstrap Switches

• Available in 5-mm × 5-mm 32-Pin VQFN Package

2 Applications

• Multiple Rail Systems

• Telecom Base Station

• Switcher and Router Networking

• xDSL Broadband Access

• Server and Storage System

3 Description

The TPS40322 device is a dual-output, synchronous

buck controller. It can also be configured as a singleoutput,

two-phase controller. The 180° out-of-phase

operation reduces the input current ripple and

extends the input capacitor lifetime. Bidirectional

master and slave synchronization function provides

evenly distributed phase shift for a four-output system that reduces input ripple further and attenuates the

system noise.

The wide input range can support 3.3-V, 5-V, and

12-V buses. The accurate reference voltage satisfies

the precision voltage needed by ASICs and

potentially reduces the output capacitance

requirement. Separate PGOOD signals provide

flexibility for system monitoring and sequencing. The

two channels are independently controlled and each

soft-start time is programmable. Voltage mode control

is implemented to reduce noise sensitivity and also

ensures low duty ratio conversion.