TPS53681 Dual-Channel 6+2/5+3 D-CAP+TM Multiphase Step-Down Controller with PMBus and NVM | TI.com

TPS53681 (ACTIVE)

Dual-Channel 6+2/5+3 D-CAP+TM Multiphase Step-Down Controller with PMBus and NVM

 

Recommended alternative parts

  • TPS53647  -  4-Phase, D-CAP+TM Step-Down Buck Controller with NVM and PMBus Interface for ASIC
  • TPS53667  -  6-Phase, D-CAP+ Step-Down Driverless Buck Controller with NVM and PMBus Interface for AVS

Description

The TPS53681 is a multiphase step-down controller with dual channels, built-in non-volatile memory (NVM), and PMBus™ interface, and is fully compatible with TI NexFET ™power stage. Advanced control features such as D-CAP+™ architecture with undershoot reduction (USR) provide fast transient response, low output capacitance, and high efficiency. The device also provides novel phase interleaving strategy and dynamic phase shedding for efficiency improvement at different loads. The device supports fast dynamic voltage transitions with adjustable slew rate. In addition, the device supports the PMBus communication interface for reporting the telemetry of voltage, current, power, temperature, and fault conditions to the systems. All programmable parameters can be configured by the PMBus interface and can be stored in NVM as the new default values to minimize the external component count.

The TPS53681 device is offered in a thermally enhanced 40-pin QFN packaged and is rated to operate from –40°C to 125°C.

Features

  • Conversion Input Voltage Range: 4.5 V to 17 V
  • 8-Bit DAC with Selectable 5 mV or 10 mV Resolution and Output Ranges from 0.25 V to 1.52 V or 0.5 to 2.8125 V for Dual Channels
  • Phase Configurations
    • Maximum (6-Phase + 2-Phase) or (5-Phase + 3-Phase)
    • Minimum (1-Phase + 1-Phase)
  • Driverless Configuration for Efficient High-Frequency Switching
  • Dynamic Output Voltage Transitions with Programmable Slew Rates via PMBus Interface
  • Frequency Selections with Closed-loop Frequency Control: 300 kHz to 1 MHz
  • Programmable Internal Loop Compensations
  • Configurable with Non-Volatile Memory (NVM) for Low External Component Counts
  • Individual Phase Current Calibrations and Reports
  • Dynamic Phase Shedding with Programmable Current Threshold for Optimizing Efficiency at Light and Heavy Loads
  • Fast Phase-Adding for Undershoot Reduction (USR)
  • Fully Compatible with TI NexFET™ Power Stage for High-Density Solutions
  • Accurate, Adjustable Voltage Positioning
  • Patented AutoBalance™ Phase Balancing
  • Selectable, 16-level Per-Phase Current Limit
  • PMBus™ System Interface for Telemetry of Voltage, Current, Power, Temperature, and Fault Conditions
  • Low Quiescent Current
  • 5 mm × 5 mm, 40-Pin, QFN PowerPad™ 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)
Features
Duty cycle (Max) (%)
Operating temperature range (C)
Rating
Package Group
Type
Control mode
TPS53681 TPS40422 TPS40425 TPS40428 TPS53647 TPS53667
4.5     4.5     4.5     4.5     4.5     4.5    
17     20     20     20     17     17    
0.25     0.6     0.6     0.6     0.5     0.5    
2.8125     5.6     5     5     2.5     2.5    
300     60     40     40     240     420    
2     2     2     2     1     1    
8     2     2     2     4     6    
300     200     200     200     300     300    
1000     1000     1500     1500     1000     1000    
13     18     18     18     8     6.1    
Adjustable Current Limit
Dynamic Voltage Scaling
Enable
Light Load Efficiency
Multiple Outputs
PMBus
Phase Interleaving
Power Good
Pre-Bias Start-Up
Remote Sense
Synchronous Rectification
UVLO Adjustable
Voltage Margining    
Dynamic Voltage Scaling
Enable
Frequency Synchronization
Multiple Outputs
PMBus
Phase Interleaving
Remote Sense    
Adjustable Current Limit
Dynamic Voltage Scaling
Enable
Frequency Synchronization
Phase Interleaving
Power Good
Pre-Bias Start-Up
Remote Sense
Synchronous Rectification
UVLO Adjustable
Voltage Margining    
Adjustable Current Limit
Dynamic Voltage Scaling
Enable
Frequency Synchronization
PMBus
Phase Interleaving
Power Good
Pre-Bias Start-Up
Remote Sense
Synchronous Rectification
UVLO Adjustable
Voltage Margining    
Adjustable Current Limit
Dynamic Voltage Scaling
Enable
Light Load Efficiency
Output Discharge
PMBus
Phase Interleaving
Power Good
Pre-Bias Start-Up
Remote Sense
Synchronous Rectification
UVLO Adjustable
Voltage Margining    
Adjustable Current Limit
Dynamic Voltage Scaling
Enable
Light Load Efficiency
PMBus
Phase Interleaving
Power Good
Pre-Bias Start-Up
Remote Sense
Synchronous Rectification
UVLO Adjustable
Voltage Margining    
50     90     46     46     50     50    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
WQFN | 40     VQFN | 40
WQFN | 40    
VQFN | 40     VQFN | 40     WQFN | 40     WQFN | 40    
Controller     Controller     Controller     Controller     Controller     Controller    
D-CAP+     Voltage Mode     Voltage Mode     Voltage Mode     D-CAP+     D-CAP+