TPS51225C

ACTIVE

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

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TPS51397A ACTIVE 4.5-V to 24-V input, 10-A, synchronous step-down regulator Faster switching frequency and extended positive operating temperature range.

Product details

Vin (min) (V) 5.5 Vin (max) (V) 24 Iout (max) (A) 10 Operating temperature range (°C) -40 to 85 Control mode D-CAP Topology Buck Rating Catalog Vout (min) (V) 4.5 Vout (max) (V) 5.5 Features Enable, Light Load Efficiency, Power good, Synchronous Rectification Iq (typ) (µA) 900 Duty cycle (max) (%) 90 Number of phases 1
Vin (min) (V) 5.5 Vin (max) (V) 24 Iout (max) (A) 10 Operating temperature range (°C) -40 to 85 Control mode D-CAP Topology Buck Rating Catalog Vout (min) (V) 4.5 Vout (max) (V) 5.5 Features Enable, Light Load Efficiency, Power good, Synchronous Rectification Iq (typ) (µA) 900 Duty cycle (max) (%) 90 Number of phases 1
WQFN (RUK) 20 9 mm² 3 x 3
  • Input Voltage Range: 5.5 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 300kHz/355kHz Frequency Setting
  • Auto-skip Light Load Operation (TPS51225/C)
  • OOA Light Load Operation (TPS51225B)
  • Internal 0.8-ms Voltage Servo Soft-Start
  • Low-Side RDS(on) Current Sensing Scheme with 4500 ppm/°C Temperature Coefficient
  • Built-in Output Discharge Function
  • Separate Enable Input for Switchers (TPS51225/B/C)
  • Dedicated OC Setting Terminals
  • Power Good Indicator
  • OVP/UVP/OCP Protection
  • Non-latch UVLO/OTP Protection
  • 20-Pin, 3 mm × 3 mm, QFN (RUK)
  • Input Voltage Range: 5.5 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 300kHz/355kHz Frequency Setting
  • Auto-skip Light Load Operation (TPS51225/C)
  • OOA Light Load Operation (TPS51225B)
  • Internal 0.8-ms Voltage Servo Soft-Start
  • Low-Side RDS(on) Current Sensing Scheme with 4500 ppm/°C Temperature Coefficient
  • Built-in Output Discharge Function
  • Separate Enable Input for Switchers (TPS51225/B/C)
  • Dedicated OC Setting Terminals
  • Power Good Indicator
  • OVP/UVP/OCP Protection
  • Non-latch UVLO/OTP Protection
  • 20-Pin, 3 mm × 3 mm, QFN (RUK)

The TPS51225/B/C is a cost-effective, dual-synchronous buck controller 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 TPS51225/B/C 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 5.5 V to 24 V and supports output voltages of 5.0 V and 3.3 V. The TPS51225/B/C is available in a 20-pin, 3 mm × 3 mm, QFN package and is specified from –40°C to 85°C.

The TPS51225/B/C is a cost-effective, dual-synchronous buck controller 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 TPS51225/B/C 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 5.5 V to 24 V and supports output voltages of 5.0 V and 3.3 V. The TPS51225/B/C is available in a 20-pin, 3 mm × 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) 09 Sep 2012
Application note Mosfet Driver Circuit Design Guide for TPS512xx (Rev. A) 01 Apr 2019

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation model

TPS51225 Unencrypted PSpice Transient Model Package (Rev. A)

SLUM258A.ZIP (56 KB) - PSpice Model
Simulation model

TPS51225B Unencrypted PSpice Transient Model Package (Rev. A)

SLUM273A.ZIP (110 KB) - PSpice Model
Simulation model

TPS51225C Unencrypted PSpice Transient Model Package (Rev. A)

SLUM272A.ZIP (56 KB) - PSpice Model
Package Pins CAD symbols, footprints & 3D models
WQFN (RUK) 20 Ultra Librarian

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