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TPS51225B

ACTIVE

5.5-V to 24-V, dual-synchronous buck controller with Out-of-Audio™ mode

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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 Faster switching frequency and extended positive operating temperature range.

Product details

Vin (min) (V) 5.5 Vin (max) (V) 24 Vout (min) (V) 4.5 Vout (max) (V) 5.5 Iout (max) (A) 10 Iq (typ) (mA) 0.9 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 (#) 2 Number of phases 1 Rating Catalog Control mode D-CAP Type Controller
Vin (min) (V) 5.5 Vin (max) (V) 24 Vout (min) (V) 4.5 Vout (max) (V) 5.5 Iout (max) (A) 10 Iq (typ) (mA) 0.9 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 (#) 2 Number of phases 1 Rating Catalog Control mode D-CAP Type Controller
WQFN (RUK) 20 9 mm² 3 x 3
  • Input Voltage Range: 5.5 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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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

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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
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WQFN (RUK) 20 View options

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