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TPS51275B-1

ACTIVE

5.5-V to 24-V, dual-synchronous buck controller with Out-of-Audio™ mode and 3.2 ms soft start

A newer version of this product is available

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Similar functionality to the compared device
TPS51397A ACTIVE 4.5-V to 24-V input, 10-A, synchronous step-down regulator Upgraded light-load efficiency, soft start adjustable with a lower IQ and an extended positive operating temperature range.

Product details

Vin (min) (V) 5 Vin (max) (V) 24 Vout (min) (V) 4.85 Vout (max) (V) 5.1 Iout (max) (A) 20 Iq (typ) (mA) 0.8 Switching frequency (min) (kHz) 300 Switching frequency (max) (kHz) 355 Features Enable, Power good, Synchronous Rectification Operating temperature range (°C) -40 to 85 Regulated outputs (#) 2 Number of phases 1 Rating Catalog Control mode D-CAP Type Controller
Vin (min) (V) 5 Vin (max) (V) 24 Vout (min) (V) 4.85 Vout (max) (V) 5.1 Iout (max) (A) 20 Iq (typ) (mA) 0.8 Switching frequency (min) (kHz) 300 Switching frequency (max) (kHz) 355 Features Enable, Power good, Synchronous Rectification Operating temperature range (°C) -40 to 85 Regulated outputs (#) 2 Number of phases 1 Rating Catalog Control mode D-CAP Type Controller
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
  • 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
  • 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
  • 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

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.

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.

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* Data sheet TPS51275B-1 Dual Synchronous, Step-Down Controller With 5-V and 3.3-V LDOs datasheet PDF | HTML 17 Mar 2015

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TPS51275B-1 PSpice Transient Model

SLVMB87.ZIP (219 KB) - PSpice Model
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WQFN (RUK) 20 View options

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