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4.5V to 18V Input, 3.5A/3.5A Dual Synchronous Step-down Converter with I2C Controlled VID


Package | PIN: HTSSOP (DAP) | 32
Temp: Q (-40 to 125)
Carrier: Cut Tape
Qty Price
1-9 $3.47
10-24 $3.12
25-99 $2.92
100-249 $2.61
250-499 $2.44
500-749 $2.12
750-999 $1.84
1000+ $1.80


  • 4.5-V to 18-V Wide Input Voltage Range
  • I2C Controlled 7-Bits VID Programmable
    Output Voltage from 0.68 V to 1.95 V with
    10-mV Steps for Each Buck; Output Voltage Can
    Also be Set By Resistor Divider
  • Programmable Slew Rate Control for Output Voltage
  • Up to 3.5-A Maximum Continuous Output Current in
    Buck 1 and Buck 2
  • Buck 1 and Buck 2 can be Paralleled to Deliver
    up to 7-A Current
  • I2C Compatible Interface With Standard
    Mode (100 kHz) and Fast Mode (400 kHz)
  • I2C Read Back Power Good Status and Die
    Temperature Warning
  • Pulse Skipping Mode to Achieve High Efficiency
    in Light Load
  • Adjustable Switching Frequency
    200 kHz - 1.6 MHz Set by External Resistor
  • Dedicated Enable and Soft-Start for Each Buck
  • Peak Current-Mode Control with Simple Compensation
  • Cycle-by-Cycle Over Current Protection
  • 180° Out-of-Phase Operation to Reduce Input
    Capacitance and Power Supply Induced Noise
  • Over Temperature Protection
  • Available in 32-Pin Thermally Enhanced HTSSOP (DAP)
    and 36-Pin QFN 6-mm × 6-mm (RHH) Packages

Texas Instruments  TPS65273VDAPR

The TPS65273V is a monolithic dual synchronous buck regulator with wide 4.5-V to 18-V operating input voltage that can operate in 5-, 9-, 12- or 15-V bus voltages and battery chemistries. The converters are designed to simplify its application while giving the designer the option to optimize their usage according to the target application.

The TPS65273V has external feedback resistors that can be used for setting the initial start up voltage. The feedback voltage reference for this start-up option is 0.6 V. Once the VID DAC is updated via the I2C, the buck converter switches feedback resistors from external to internal. The output voltage in each buck can be programmable from 0.68 V to 1.95 V in 10-mV steps with I2C Controlled 7-Bits VID.

TPS65273V can also be I2C controlled for enabling/disabling output voltage, setting the pulse skipping mode and reading the power good status and die temperature warning.

The switching frequency of the converters can be set from 200 kHz to 1.6 MHz with an external resistor. Two converters have clock signal with 180° out-of-phase.

Two bucks in TPS65273V can be paralleled to deliver up to 10-A load current by floating the MODE pin. Two phase operation in current sharing reduces system filtering capacitance and inductance, alleviates EMI and improves output voltage ripple and noise.

TPS65273V features dedicated enable pin when I2C interface is not used. Independent soft-start pin provides flexibility in power up programmability. Constant frequency peak current mode control simplifies the compensation and provides fast transient response. Cycle-by-cycle over current protection and hiccup mode operation limit MOSFET power dissipation in short circuit or over loading fault conditions. Low side reverse over current protection also prevents excessive sinking current from damaging the converter.

TPS65273V also features a light load pulse skipping mode (PSM) that can be controlled by I2C or MODE pin configuration. The PSM mode allows a power loss reduction on the input power supplied to the system to achieve high efficiency at light loading.

The TPS65273V is available in a 32-pin thermally enhanced HTSSOP (DAP) package and 36-pin QFN 6-mm × 6-mm (RHH) package.