TPS51120

用于笔记本电源的具有 100mA 待机寄存器的双电流模式同步步降控制器

The is a highly sophisticated dual, 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 5-V UVP. No negative voltage appears at output voltage node during UVLO, UVP, and OCP, OTP or loss of VIN.

The TPS51120 32-pin QFN package is specified from –40°C to 85°C ambient temperature.

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3.3-V and 5-V 100-mA Bootstrapped Standby

Regulators with Independent Enables

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Selectable D-CAP™ Mode Enables Fast Transient

Response Less than 100 ns

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Selectable Low Ripple Current Mode

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Less than 1% Internal Reference Accuracy

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Selectable PWM-only/Auto-skip Modes

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Low-side RDSon Loss-less Current Sensing

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RSENSE Accurate Current Sense Option

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Internal Soft-Start and Integrated VOUT Discharge

Transistors

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Integrated 2-V Reference

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Adaptive Gate Drivers with Integrated Boost Diode

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Powergood for Each Channel with Delay Timer

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Fault Disable Mode

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Supply Input Voltage Range: 4.5 V to 28 V