TPS65251-1RHAR by Texas Instruments | DC to DC Converters | Avnet ASIA
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TPS65251-1RHAR

Texas Instruments

Conv DC-DC Triple Step Down 4.5V 17V 40-Pin VQFN T/R

Manufacturer Part #: TPS65251-1RHAR

Alternate Part #: TPS65251-1RHAR


RoHS Compliant

Descriptions

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Information

The TPS65251-x 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 an 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 the 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 the 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.

TPS65251-x features a supervisor circuit that monitors each converter output. The PGOOD pin is asserted when sequencing is done, all PG signals are reported and a selectable end of reset time lapses. The polarity of the PGOOD signal is active high.

All converters feature an automatic low-power pulse PFM skipping mode, which improves efficiency during light loads and standby operation, while ensuring a very-low output ripple, allowing for a value of less than 2% at low output voltages.

Key Features

  • Wide Input Supply Voltage Range (4.5 to 18 V)
  • Output Range 0.8 V to VIN – 1 V
  • Continuous Loading: 3 A (Buck 1),
    2 A (Buck 2 and 3)
  • Maximum Current: 3.5 A (Buck 1),
    2.5 A (Buck 2 and 3)
  • Adjustable Switching Frequency
    300 kHz to 2.2 MHz Set by External Resistor
  • Dedicated Enable for Each Buck
  • External Synchronization Pin for Oscillator
  • Adjustable Current Limit Set by External Resistor
  • Soft-Start Pins
  • Current-Mode Control With Simple Compensation
    Circuit
  • Power Good
  • Automatic PFM/PWM Operation
  • VQFN Package, 40-Pin 6-mm × 6-mm RHA
  • Technical Attributes

    Description
    Value
    Find similar Parts
    Max Processing Temp
    260
    Maximum Output Current
    3|2|2 A
    Switching Frequency
    2200 kHz
    Supplier Package
    VQFN
    Type
    Step Down
    Operating Temperature
    -40 to 125 °C
    Operating Supply Voltage
    4.5 to 18 V
    Output Voltage
    0.8 to 17 V
    Minimum Input Voltage
    4.5 V
    Mounting
    Surface Mount
    Pin Count
    40
    Number of Outputs
    3
    Lead Finish
    Gold Over Nickel Palladium
    Output Type
    Adjustable
    Screening Level
    Extended Industrial
    MSL Level
    3
    Maximum Input Voltage
    17 V
    Product Dimensions
    6 x 6 x 0.95(Max)
    Switching Regulator
    Yes

    ECCN / UNSPSC

    Description
    Value
    ECCN:
    EAR99
    SCHEDULE B:
    8542390000"
    HTSN:
    8542390001"
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