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TPS51285B ACTIVE 5-V to 24-V, dual-synchronous buck controller with ultra-low quiescent current TPS51285B has lower Iq, 0.8-ms soft start, auto skip mode, and 400/475-kHz operation.

Product details

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 Regulated outputs (#) 4 Number of phases 1 Rating Catalog
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 Regulated outputs (#) 4 Number of phases 1 Rating Catalog
WQFN (RUK) 20 9 mm² 3 x 3
  • 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)
  • 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)

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.

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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Type Title Date
* Data sheet Dual Synchronous, Step-Down Controller with 5-V and 3.3-V LDOs datasheet (Rev. B) 27 Feb 2013
Application note Mosfet Driver Circuit Design Guide for TPS512xx (Rev. A) 01 Apr 2019

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TPS51275B Unencrypted PSpice Transient Model Package (Rev. A) TPS51275B Unencrypted PSpice Transient Model Package (Rev. A)

Simulation model

TPS51275B TINA-TI Transient Reference Design TPS51275B TINA-TI Transient Reference Design

Simulation model

TPS51275B TINA-TI Transient Spice Model TPS51275B TINA-TI Transient Spice Model

Simulation tool

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PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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WQFN (RUK) 20 View options

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