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Details for Texas Instruments


4.5-V TO 18-V input, 3A/2A/2A output, synchronous triple buck converter
Buy Directly from Texas Instruments (4421 in Stock)
$1.6000 per unit
Series Information for TPS65251RHAR - Texas Instruments


  • feature
    0.8 V, 1% Accuracy Reference
  • feature
    Adjustable Current Limit Set By External Resistor
  • feature
    Adjustable Switching Frequency 300 kHz to 2.2 MHz Set by External Resistor
  • feature
    Continuous Loading: 3 A (Buck 1), 2 A (Buck 2 and 3)
  • feature
    Current-Mode Control With Simple Compensation Circuit
  • feature
    Dedicated Enable for Each Buck
  • feature
    External Enable/Sequencing and Soft-Start Pins
  • feature
    External Synchronization Pin for Oscillator
  • feature
    Maximum Current: 3.5 A (Buck 1), 2.5 A (Buck 2 and 3)
  • feature
    Optional Low-Power Mode Operation for Light Loads
  • feature
  • feature
    Soft-Start Pins
  • feature
    VQFN Package, 40-Pin 6 mm u00d7 6 mm RHA
  • feature
    Wide Input Supply Voltage Range (4.5 to 18 V)


The TPS65251 features three synchronous wide input range high efficiency buck converters. The converters are designed to simplify its application while giving the designer the option to optimize their usage according to the target application. The converters can operate in 5-, 9-, 12- or 15-V systems and have integrated power transistors. The output voltage can be set externally using a resistor divider to any value between 0.8 V and close to the input supply. Each converter features enable pin that allows a delayed start-up for sequencing purposes, soft-start pin that allows adjustable soft-start time by choosing the soft-start capacitor, and a current limit (RLIMx) pin that enables designer to adjust current limit by selecting an external resistor and optimize the choice of inductor. The current mode control allows a simple RC compensation. The switching frequency of the converters can either be set with an external resistor connected to ROSC pin or can be synchronized to an external clock connected to SYNC pin if needed. The switching regulators are designed to operate from 300 kHz to 2.2 MHz. 180° out of phase operation between Buck 1 and Buck 2, 3 (Buck 2 and 3 run in phase) minimizes the input filter requirements.


Supply Voltage:
No. of Step-Down DC - DC Converters:
No. of LDO Regulators:
No. of Regulated Outputs:
Digital IC Case:
No. of Pins:
Operating Temperature Min:
Operating Temperature Max:
Product Range:
Automotive Qualification Standard:
RoHS Phthalates Compliant:
MSL 3 - 168 hours
No SVHC (27-Jun-2018)
Operating Temperature Range:
-40°C to +125°C

Alternate Descriptions

Avnet America

Synchronous Step Down Three Buck Switcher 40-Pin VQFN EP T/R

Avnet America product

Avnet Europe

Synchronous Step Down Three Buck Switcher 40-Pin VQFN EP T/R

Avnet Europe product

Texas Instruments

4.5-V TO 18-V input, 3A/2A/2A output, synchronous triple buck converter

Texas Instruments product