TPS40322 Dual Output or Two-phase Synchronous Buck Controller |


Dual Output or Two-phase Synchronous Buck Controller



The TPS40322 device is a dual-output, synchronous buck controller. It can also be configured as a single-output, 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.


  • Dual-Output or Two-Phase Synchronous Buck
  • 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
  • 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
  • Individual Overcurrent Limit Setting
  • Hiccup Overcurrent Protection
  • Accurate Inductor DCR or Resistive Current
  • Remote Sense for Two-Phase Applications
  • Internal N-Channel FET Drivers
  • Integrated Bootstrap Switches
  • Available in 5-mm × 5-mm 32-Pin VQFN Package

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Parametrics Compare all products in Buck controllers (external switch)

Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Regulated outputs (#)
Number of Phases
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Duty cycle (Max) (%)
Operating temperature range (C)
Package Group
Control mode
TPS40322 TPS40422
3     4.5    
20     20    
0.6     0.6    
5.6     5.6    
60     60    
2     2    
2     2    
100     200    
1000     1000    
6     18    
Frequency Synchronization
Multiple Outputs
Phase Interleaving
Power Good
Remote Sense    
Dynamic Voltage Scaling
Frequency Synchronization
Multiple Outputs
Phase Interleaving
Remote Sense    
95     90    
-40 to 125     -40 to 125    
Catalog     Catalog    
VQFN | 32     VQFN | 40
WQFN | 40    
Controller     Controller    
Voltage Mode     Voltage Mode    

Design tool

WEBENCH® Designer TPS40322

  Min   Max Range
Vin1  V 3.30 to 20.00V
Vout1  V 0.6 to 5.6V
Iout1  A ≤ 20.00A
Vin2  V 3.30 to 20.00V
Vout2  V 0.6 to 5.6V
Iout2  A ≤ 20.00A
Ambient Temp  °C -40 to 125°C