TPS51275

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5.5-V to 24-V, dual-synchronous buck controller with 5-V and 3.3-V LDOs

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Product details

Parameters

Vin (Min) (V) 5 Vin (Max) (V) 24 Vout (Min) (V) 4.5 Vout (Max) (V) 5.5 Iout (Max) (A) 20 Iq (Typ) (uA) 800 Switching frequency (Min) (kHz) 300 Switching frequency (Max) (kHz) 355 Features Enable, Light Load Efficiency, Power Good, Synchronous Rectification Operating temperature range (C) -40 to 85 Regulated outputs (#) 4 Number of phases 1 Rating Catalog open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

WQFN (RUK) 20 9 mm² 3 x 3 open-in-new Find other Buck controllers (external switch)

Features

  • Input Voltage Range: 5 V to 24 V
  • Output Voltages: 5 V and 3.3 V (Adjustable Range ±10%)
  • 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 Setting
  • Auto-skip Light Load Operation (TPS51275, and TPS51275C)
  • OOA Light Load Operation (TPS51275B)
  • Internal 0.8-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 x 3 mm, QFN (RUK)
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Description

The TPS51275, TPS51275B and TPS51275C are cost-effective, dual-synchronous buck controllers targeted for notebook system-power supply solutions. It provides 5-V and 3.3-V 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 TPS51275, TPS51275B and TPS51275C 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 supply input voltage ranging from 5 V to 24 V and supports output voltages of 5.0 V and 3.3 V. The TPS51275, TPS51275B and TPS51275C are available in a 20-pin, 3 mm x 3 mm, QFN package and is specified from –40°C to 85°C.

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Technical documentation

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Type Title Date
* Data sheet Dual Synchronous, Step-Down Controller with 5-V and 3.3-V LDOs datasheet (Rev. B) Feb. 27, 2013
Application note Mosfet Driver Circuit Design Guide for TPS512xx (Rev. A) Apr. 01, 2019
Application note Understanding Dead-time Based On TPS51225/275/285 Aug. 22, 2018
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018

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WQFN (RUK) 20 View options

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