TPS51427A Series

Dual-output synchronous D-CAP synchronous buck controller for notebook power with OOB disabled

Catalog

Dual-output synchronous D-CAP synchronous buck controller for notebook power with OOB disabled

Part	Mounting Type	Supplier Device Package	Voltage - Output	Voltage - Output	Applications	Number of Outputs	Package / Case	Voltage - Input [Min]	Voltage - Input [Max]	Operating Temperature [Max]	Operating Temperature [Min]
Texas Instruments TPS51427RHBT	Surface Mount	32-VQFN (5x5)	3.3 V 5 V	Adj	Controller Notebook Power System	2	32-VFQFN Exposed Pad	5.5 V	28 V	85 °C	-40 °C
Texas Instruments TPS51427ARHBT	Surface Mount	32-VQFN (5x5)	3.3 V 5 V	Adj	Controller Notebook Power System	2	32-VFQFN Exposed Pad	5.5 V	28 V	85 °C	-40 °C

Catalog

Dual-output synchronous D-CAP synchronous buck controller for notebook power with OOB disabled

Key Features

• Fixed-Frequency Emulated On-Time Control; Frequency Selectable from Three OptionsD-CAP™ Mode Enables Fast Transient Response Less than 100 nsAdvanced Ramp Compensation Allows Low Output Ripple with Minimal JitterSelectable PWM-Only/OOA™/Auto-Skip ModesWide Input Voltage Range: 5.5 V to 28 VDual Fixed or Adjustable SMPS:0.7 V to 5.9 V (Channel1)0.5 V to 2.5 V (Channel2)Fixed 3.3-V/5-V, or Adjustable Output 0.7-V to 4.5-V LDO; Capable of Sourcing 100 mAFixed 3.3-VREF Output Capable of Sourcing 10 mATemperature Compensated Low-Side RDS(on)Current SensingAdaptive Gate Drivers with Integrated Boost SwitchBootstrap Charge Auto RefreshIntegrated Soft Start, Tracking Soft StopIndependent PGOOD and EN for Each ChannelOOB Function Disabled. Refer to TPS51427 for OOB-Enabled DeviceAPPLICATIONSNotebook I/O and System Bus RailsGraphics ApplicationPDAs and Mobile Communication DevicesD-CAP, OOA are trademarks of Texas Instruments.All other trademarks are the property of their respective owners.Fixed-Frequency Emulated On-Time Control; Frequency Selectable from Three OptionsD-CAP™ Mode Enables Fast Transient Response Less than 100 nsAdvanced Ramp Compensation Allows Low Output Ripple with Minimal JitterSelectable PWM-Only/OOA™/Auto-Skip ModesWide Input Voltage Range: 5.5 V to 28 VDual Fixed or Adjustable SMPS:0.7 V to 5.9 V (Channel1)0.5 V to 2.5 V (Channel2)Fixed 3.3-V/5-V, or Adjustable Output 0.7-V to 4.5-V LDO; Capable of Sourcing 100 mAFixed 3.3-VREF Output Capable of Sourcing 10 mATemperature Compensated Low-Side RDS(on)Current SensingAdaptive Gate Drivers with Integrated Boost SwitchBootstrap Charge Auto RefreshIntegrated Soft Start, Tracking Soft StopIndependent PGOOD and EN for Each ChannelOOB Function Disabled. Refer to TPS51427 for OOB-Enabled DeviceAPPLICATIONSNotebook I/O and System Bus RailsGraphics ApplicationPDAs and Mobile Communication DevicesD-CAP, OOA are trademarks of Texas Instruments.All other trademarks are the property of their respective owners.

Description

The TPS51427A is a dual synchronous step-down controller designed for notebook and mobile communications applications. This device is part of a low-cost suite of notebook power bus regulators that enables system designs with low external component counts. The TPS51427A includes two pulse-width-modulation (PWM) controllers, SMPS1 and SMPS2. The output of SMPS1 can be adjusted from 0.7 V to 5.9 V, while the output of SMPS2 can be adjusted from 0.5 V to 2.5 V. This device also features a low-dropout (LDO) regulator that provides a 5-V/3.3-V output, or adjustable from 0.7-V to 4.5-V output via LDOREFIN. The fixed-frequency emulated adaptive on-time control supports seamless operation between PWM mode under heavy load conditions and reduced frequency operation at light loads for high-efficiency down to the milliampere range. An integrated boost switch enhances the high-side MOSFET to further improve efficiency. The main control loop is the D-CAP™ mode that is optimized for low equivalent series resistance (ESR) output capacitors such as POSCAP or SP-CAP. Advanced ramp compensation minimizes jitter without degrading line and load regulation. RDS(on)current sensing methods offers maximum cost saving. The TPS51427A supports supply input voltages that range from 5.5 V to 28 V. It is available in the 32-pin, 5-mm × 5-mm QFN package (Green, RoHs- compliant, and Pb-free). The device is specified from -40°C to +85°C. The TPS51427A is a dual synchronous step-down controller designed for notebook and mobile communications applications. This device is part of a low-cost suite of notebook power bus regulators that enables system designs with low external component counts. The TPS51427A includes two pulse-width-modulation (PWM) controllers, SMPS1 and SMPS2. The output of SMPS1 can be adjusted from 0.7 V to 5.9 V, while the output of SMPS2 can be adjusted from 0.5 V to 2.5 V. This device also features a low-dropout (LDO) regulator that provides a 5-V/3.3-V output, or adjustable from 0.7-V to 4.5-V output via LDOREFIN. The fixed-frequency emulated adaptive on-time control supports seamless operation between PWM mode under heavy load conditions and reduced frequency operation at light loads for high-efficiency down to the milliampere range. An integrated boost switch enhances the high-side MOSFET to further improve efficiency. The main control loop is the D-CAP™ mode that is optimized for low equivalent series resistance (ESR) output capacitors such as POSCAP or SP-CAP. Advanced ramp compensation minimizes jitter without degrading line and load regulation. RDS(on)current sensing methods offers maximum cost saving. The TPS51427A supports supply input voltages that range from 5.5 V to 28 V. It is available in the 32-pin, 5-mm × 5-mm QFN package (Green, RoHs- compliant, and Pb-free). The device is specified from -40°C to +85°C.