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.