TPS51125A

具有 Out-of-Audio 操作和 100mA LDO 的双路同步降压控制器

The 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 270-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’s efficiency. The TPS51125A supports high efficiency, fast transient response and provides a combined power-good signal. Out-of-Audio mode light-load operation enables low acoustic noise at much higher efficiency than conventional forced PWM operation. Adaptive on-time D-CAP control provides convenient and efficient operation. The part operates with supply input voltages ranging from 5.5 V to 28 V and supports output voltages from 2 V to 5.5 V. The TPS51125A is available in a 24-pin QFN package and is specified from -40°C to 85°C ambient temperature range.

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Wide Input Voltage Range: 5.5 V to 28 V

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Output Voltage Range: 2 V to 5.5 V

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Built-in 100-mA 5-V/3.3-V LDO with Switches

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Built-in 1% 2-V Reference Output

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With/Without Out-of-Audio™ Mode Selectable Light Load and PWM only Operation

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Internal 1.6-ms Voltage Servo Softstart

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Adaptive On-Time Control Architecture with Four Selectable Frequency Setting

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4500 ppm/°C RDSon Current Sensing

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Built-In Output Discharge

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Power Good Output

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Built-in OVP/UVP/OCP

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Thermal Shutdown Non-latch

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QFN24 RGE