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TPS51275B-1 Dual Synchronous, Step-Down Controller With 5-V and 3.3-V LDOs, with 3.2ms soft start.


Package | PIN: RUK | 20
Temp: I (-40 to 85)
Carrier: Cut Tape
Qty Price
1-9 $2.55
10-24 $2.29
25-99 $2.13
100-249 $1.87
250-499 $1.75
500-749 $1.49
750-999 $1.26
1000+ $1.20


  • Input Voltage Range: 5 V to 24 V
  • Output Voltages: 5 V and 3.3 V (Adjustable Range
  • Built-in, 100-mA, 5-V, and 3.3-V LDOs
  • Clock Output for Charge-Pump
  • ±1% Reference Accuracy
  • Adaptive On-Time D-CAP™ Mode Control
    Architecture with 300-kHz and 355-kHz Frequency
  • Out-of-Audio™ (OOA) Light-Load Operation
  • Internal 3.2-ms Voltage Servo Soft-Start
  • Low-Side RDS(on) Current Sensing Scheme
  • Built-In Output Discharge Function
  • Separate Enable Input for Switchers
  • Dedicated OC Setting Terminals
  • Power Good Indicator
  • OVP, UVP, and OCP Protection
  • Non-Latch UVLO and OTP Protection
  • 20-Pin, 3-mm × 3-mm, WQFN (RUK) Package

Texas Instruments  TPS51275B-1RUKR

The TPS51275B-1 device is a cost-effective, dual-synchronous buck controller targeted for notebook system-power supply solutions. The device has 5-V and 3.3-V low-dropout regulators (LDOs) and requires few external components. The 260-kHz VCLK output can be used to drive an external charge pump, generating gate drive voltage for the load switches without reducing the main converter efficiency. The TPS51275B-1 device supports high efficiency, fast transient response and provides a combined power-good signal. Adaptive on-time, D-CAP control provides convenient and efficient operation. The device operates with a supply input voltage ranging from 5 to 24 V and supports output voltages of 5 V and 3.3 V. The TPS51275B-1 device is available in a 20-pin, 3-mm × 3-mm, WQFN package and is specified from –40°C to 85°C.