TPS65251RHAR Datasheet

4.5-V to 18-V Input, High-Current, Synchronous Step-Down Three Buck Switcher With Integrated FET


The TPS65251 features three synchronous wide input range high efficiency buck converters. The converters are designed to simplify its application while giving the designer the option to optimize their usage according to the target application. The converters can operate in 5-, 9-, 12- or 15-V systems and have integrated power transistors. The output voltage can be set externally using a resistor divider to any value between 0.8 V and close to the input supply. Each converter features enable pin that allows a delayed start-up for sequencing purposes, soft start pin that allows adjustable soft-start time by choosing the soft-start capacitor, and a current limit (RLIMx) pin that enables designer to adjust current limit by selecting an external resistor and optimize the choice of inductor. The current mode control allows a simple RC compensation.

• Wide Input Supply Voltage Range (4.5 V - 18 V)
• 0.8 V, 1% Accuracy Reference
• Continuous Loading: 3 A (Buck 1), 2 A (Buck 2 and 3)
• Maximum Current: 3.5 A (Buck 1), 2.5 A (Buck 2 and 3)
• Adjustable Switching Frequency 300 kHz - 2.2 MHz Set By External Resistor
• Dedicated Enable for Each Buck
• External Synchronization Pin for Oscillator
• External Enable/Sequencing and Soft Start Pins
• Adjustable Current Limit Set By External Resistor
• Soft Start Pins
• Current-Mode Control With Simple Compensation Circuit
• Power Good
• Optional Low Power Mode Operation for Light Loads
• QFN Package, 40-Pin 6 mm x 6 mm RHA

• Set Top Boxes
• Blu-ray DVD
• Car Audio/Video
• Security Camera



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Manufacturer information


Texas Instruments introduction - Texas Instruments Incorporated (TI) is a global semiconductor design and manufacturing company that develops analog ICs and embedded processors. By employing the world's brightest minds, TI creates innovations that shape the future of technology. TI is helping more than 100,000 customers transform the future, today.

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