TPS51120RHBRG4 Datasheet

PMIC - Voltage Regulators - DC DC Switching Controllers


The TPS51120RHBRG4 is a highly sophisticated dual current mode synchronous step-down controller. It is a full featured controller designed to run directly off a three- or four-cell Li-ion battery and provide high-power and 5-V and/or 3.3-V standby regulation for all the downstream circuitry in a notebook computer system. High current, 100-mA, 5-V or 3.3-V on-board linear regulators have glitch-free switch over function to SMPS and can be kept alive independently during standby state. The pseudo-constant frequency adaptive on-time control scheme supports full range of current mode operation including simplified loop compensation, ceramic output capacitors as well as seamless transition to reduced frequency operation at light-load condition. Optional D-CAP™ mode operation optimized for SP-CAP or POSCAP output capacitors allows further reduction of external compensation parts. Dynamic UVP supports VIN line sag without latch off by hitting 5V UVP. No negative voltage appears at output voltage node during UVLO, UVP, and OCP, OTP or loss of VIN. The TPS51120RHBRG4 32-pin QFN package is specified from –40°C to 85°C ambient temperature. TPS51120RHBRG4 Features • 3.3-V and 5-V 100-mA Bootstrapped Standby Regulators with Independent Enables• Selectable D-CAP Mode Enables Fast Transient Response Less than 100 ns• Selectable Low Ripple Current Mode• Less than 1% Internal Reference Accuracy• Selectable PWM-only/Auto-skip Modes• Low-side RDS(on)Loss-less Current Sensing• RSENSE Accurate Current Sense Option• Internal Soft-start and Integrated VOUT Discharge Transistors• Integrated 2-V Reference • Adaptive Gate Drivers with Integrated Boost Diode• Power Good for Each Channel with Delay Timer• Fault Disable Mode• Supply Input Voltage Range: 4.5 V to 28 V TPS51120RHBRG4 Applications • Notebook Computers System Bus and I/O


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Manufacturer information


Seiko Instruments Inc. Is a Japanese company which head office is located in 8, Nakase 1-chome, Mihama-ku, Chiba-shi, Chiba 261-8507, Japan . It’s business lines are: Watches Business Watches, Watch Movements Electronic Components Business Quartz crystals, Micro batteries, etc. Precision Mechatronics Business Inkjet printer heads, Hard disk components, Thermal printers, Compact precision components, Machine tools, FA, Musical instrument accessories, Radiation detection and measurement systems, etc.

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