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TPS51275C

ACTIVE

5.5-V to 24-V, dual-synchronous buck controller with VREG5 always-on LDO

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) (mA) 0.8 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 125 Regulated outputs (#) 4 Number of phases 1 Rating Catalog Control mode D-CAP Type Controller
Vin (min) (V) 5 Vin (max) (V) 24 Vout (min) (V) 4.5 Vout (max) (V) 5.5 Iout (max) (A) 20 Iq (typ) (mA) 0.8 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 125 Regulated outputs (#) 4 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
  • 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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* Data sheet Dual Synchronous, Step-Down Controller with 5-V and 3.3-V LDOs datasheet (Rev. B) 27 Feb 2013

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TPS51275 Unencrypted PSpice Transient Model Package (Rev. A)

SLUM311A.ZIP (179 KB) - PSpice Model
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WQFN (RUK) 20 View options

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