TPS51225C Series

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

Catalog

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

Part	Topology	Number of Outputs	Supplier Device Package	Voltage/Current - Output 3	Operating Temperature [Max]	Operating Temperature [Min]	Voltage - Supply [Min]	Voltage - Supply [Max]	Mounting Type	Package / Case	Frequency - Switching	Voltage/Current - Output 2	Voltage/Current - Output 1	Voltage - Output	Supplied Contents	Current - Output	Board Type	Outputs and Type	Outputs and Type	Voltage - Input [Max]	Voltage - Input [Min]	Main Purpose	Utilized IC / Part	Regulator Topology
Texas Instruments TPS51225BRUKT	Linear (LDO) (2) Step-Down (Buck) Synchronous (2)	4	20-WQFN (3x3)	3 V 100 mA	85 °C	-40 °C	5.5 V	24 V	Surface Mount	20-WFQFN Exposed Pad	300 kHz 355 kHz	Controller	Controller
Texas Instruments TPS51225CRUKR	Linear (LDO) (2) Step-Down (Buck) Synchronous (2)	4	20-WQFN (3x3)	3 V 100 mA	85 °C	-40 °C	5.5 V	24 V	Surface Mount	20-WFQFN Exposed Pad	300 kHz 355 kHz	Controller	Controller
Texas Instruments TPS51225EVM-133											300 kHz 355 kHz			3.3 V 5 V	Board(s)	10 A 100 mA	Fully Populated	4	Non-Isolated	20 V	8 V	DC/DC Step Down with LDO	TPS51225	Buck
Texas Instruments TPS51225BRUKR	Linear (LDO) (2) Step-Down (Buck) Synchronous (2)	4	20-WQFN (3x3)	3 V 100 mA	85 °C	-40 °C	5.5 V	24 V	Surface Mount	20-WFQFN Exposed Pad	300 kHz 355 kHz	Controller	Controller
Texas Instruments TPS51225RUKT	Linear (LDO) (2) Step-Down (Buck) Synchronous (2)	4	20-WQFN (3x3)	3 V 100 mA	85 °C	-40 °C	5.5 V	24 V	Surface Mount	20-WFQFN Exposed Pad	300 kHz 355 kHz	Controller	Controller
Texas Instruments TPS51225CRUKT	Linear (LDO) (2) Step-Down (Buck) Synchronous (2)	4	20-WQFN (3x3)	3 V 100 mA	85 °C	-40 °C	5.5 V	24 V	Surface Mount	20-WFQFN Exposed Pad	300 kHz 355 kHz	Controller	Controller

Catalog

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

Key Features

• Input Voltage Range: 5.5 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 300kHz/355kHz Frequency SettingAuto-skip Light Load Operation (TPS51225/C)OOA Light Load Operation (TPS51225B)Internal 0.8-ms Voltage Servo Soft-StartLow-Side RDS(on)Current Sensing Scheme with 4500 ppm/°C Temperature CoefficientBuilt-in Output Discharge FunctionSeparate Enable Input for Switchers (TPS51225/B/C)Dedicated OC Setting TerminalsPower Good IndicatorOVP/UVP/OCP ProtectionNon-latch UVLO/OTP Protection20-Pin, 3 mm × 3 mm, QFN (RUK)Input Voltage Range: 5.5 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 300kHz/355kHz Frequency SettingAuto-skip Light Load Operation (TPS51225/C)OOA Light Load Operation (TPS51225B)Internal 0.8-ms Voltage Servo Soft-StartLow-Side RDS(on)Current Sensing Scheme with 4500 ppm/°C Temperature CoefficientBuilt-in Output Discharge FunctionSeparate Enable Input for Switchers (TPS51225/B/C)Dedicated OC Setting TerminalsPower Good IndicatorOVP/UVP/OCP ProtectionNon-latch UVLO/OTP Protection20-Pin, 3 mm × 3 mm, QFN (RUK)

Description

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.