TPS5110

具有 NMOS LDO 控制器的同步降压 PWM 控制器

The provides one PWM-mode synchronous buck regulator controller SBRC and one low drop-out LDO regulator controller. The TPS5110 supports a low-voltage/high-current power supply for I/O and other peripherals in modern digital systems. The SBRC of the TPS5110 automatically adjusts from PWM mode to SKIP mode to maintain high efficiency under all load conditions. The LDO controller drives an external N-channel power MOSFET that realizes fast response and ultra-low dropout voltage. A unique overshoot protection circuit prevents a voltage hump at fast load decreasing transients. The current protection circuit for SBRC detects the drain-to-source voltage drop across the low-side and high-side power MOSFET while it is conducting. Also, the current protection circuit has a temperature coefficient to compensate for the RDSon variation of the MOSFET. This resistor-less current protection simplifies the system design and reduces the external parts count. The LDO controller includes current-limit protection. Other features, such as undervoltage lockout, power good, overvoltage, undervoltage, and programmable short-circuit protection promote system reliability.

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Switching Mode Step-Down dc-to-dc Controller With Fast LDO Controller

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Input Voltage Range

       Switcher: 4.5 V to 28 V

       LDO: 1.1 V to 3.6 V

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Output Voltage Range

       Switcher: 0.9 V to 3.5 V

       LDO: 0.9 V to 2.5 V

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Synchronous for High Efficiency

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Precision VREF ±1 %

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PWM Mode Control: Max. 500-kHz Operation

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High-Speed Error Amplifier

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Overcurrent Protection With Temperature Compensation Circuit

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Overvoltage and Undervoltage Protection

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Programmable Short-Circuit Protection

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APPLICA ONS

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Notebook PCs, PDAs

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Consumer Game Systems

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DSP Application