TPS51275B-1 Series

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

Catalog

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

Part	Frequency - Switching	Operating Temperature [Max]	Operating Temperature [Min]	Voltage/Current - Output 1	Package / Case	Topology	Supplier Device Package	Voltage - Supply [Max]	Voltage - Supply [Min]	Voltage/Current - Output 3	Number of Outputs	Voltage/Current - Output 2	Mounting Type
Texas Instruments TPS51275CRUKT	300 kHz 355 kHz	85 °C	-40 °C	Controller	20-WFQFN Exposed Pad	Linear (LDO) (2) Step-Down (Buck) Synchronous (2)	20-WQFN (3x3)	24 V	5 V	3.3 V 100 mA	4	Controller	Surface Mount
Texas Instruments TPS51275RUKR	300 kHz 355 kHz	85 °C	-40 °C	Controller	20-WFQFN Exposed Pad	Linear (LDO) (2) Step-Down (Buck) Synchronous (2)	20-WQFN (3x3)	24 V	5 V	3.3 V 100 mA	4	Controller	Surface Mount
Texas Instruments TPS51275BRUKR	300 kHz 355 kHz	85 °C	-40 °C	Controller	20-WFQFN Exposed Pad	Linear (LDO) (2) Step-Down (Buck) Synchronous (2)	20-WQFN (3x3)	24 V	5 V	3.3 V 100 mA	4	Controller	Surface Mount
Texas Instruments TPS51275RUKT	300 kHz 355 kHz	85 °C	-40 °C	Controller	20-WFQFN Exposed Pad	Linear (LDO) (2) Step-Down (Buck) Synchronous (2)	20-WQFN (3x3)	24 V	5 V	3.3 V 100 mA	4	Controller	Surface Mount
Texas Instruments TPS51275B-1RUKR	300 kHz 355 kHz	85 °C	-40 °C	Controller	20-WFQFN Exposed Pad	Linear (LDO) (2) Step-Down (Buck) Synchronous (2)	20-WQFN (3x3)	24 V	5.5 V	3 V 100 mA	4	Controller	Surface Mount
Texas Instruments TPS51275B-1RUKT	300 kHz 355 kHz	85 °C	-40 °C	Controller	20-WFQFN Exposed Pad	Linear (LDO) (2) Step-Down (Buck) Synchronous (2)	20-WQFN (3x3)	24 V	5.5 V	3 V 100 mA	4	Controller	Surface Mount
Texas Instruments TPS51275CRUKR	300 kHz 355 kHz	85 °C	-40 °C	Controller	20-WFQFN Exposed Pad	Linear (LDO) (2) Step-Down (Buck) Synchronous (2)	20-WQFN (3x3)	24 V	5 V	3.3 V 100 mA	4	Controller	Surface Mount
Texas Instruments TPS51275BRUKT	300 kHz 355 kHz	85 °C	-40 °C	Controller	20-WFQFN Exposed Pad	Linear (LDO) (2) Step-Down (Buck) Synchronous (2)	20-WQFN (3x3)	24 V	5 V	3.3 V 100 mA	4	Controller	Surface Mount

Catalog

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

Key Features

• Input Voltage Range: 5 V to 24 VOutput Voltages: 5 V and 3.3 V (Adjustable Range ±10%)Built-in, 100-mA, 5-V and 3.3-V LDOsClock Output for Charge-Pump±1% Reference AccuracyAdaptive On-Time D-CAP Mode Control Architecture with 300-kHz and 355-kHz Frequency SettingAuto-skip Light Load Operation (TPS51275, and TPS51275C)OOA Light Load Operation (TPS51275B)Internal 0.8-ms Voltage Servo Soft-StartLow-Side RDS(on)Current Sensing SchemeBuilt-In Output Discharge FunctionSeparate Enable Input for SwitchersDedicated OC Setting TerminalsPower Good IndicatorOVP, UVP and OCP ProtectionNon-Latch UVLO and OTP Protection20-Pin, 3 mm x 3 mm, QFN (RUK)Input Voltage Range: 5 V to 24 VOutput Voltages: 5 V and 3.3 V (Adjustable Range ±10%)Built-in, 100-mA, 5-V and 3.3-V LDOsClock Output for Charge-Pump±1% Reference AccuracyAdaptive On-Time D-CAP Mode Control Architecture with 300-kHz and 355-kHz Frequency SettingAuto-skip Light Load Operation (TPS51275, and TPS51275C)OOA Light Load Operation (TPS51275B)Internal 0.8-ms Voltage Servo Soft-StartLow-Side RDS(on)Current Sensing SchemeBuilt-In Output Discharge FunctionSeparate Enable Input for SwitchersDedicated OC Setting TerminalsPower Good IndicatorOVP, UVP and OCP ProtectionNon-Latch UVLO and OTP Protection20-Pin, 3 mm x 3 mm, QFN (RUK)

Description

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.