TPS65251RHAT

Product Summary

The TPS65251RHAT is 4.5-V to 18-V input, high current, synchronous step down three buck switcher with integrated FET. The TPS65251RHAT 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. The TPS65251RHAT is widely used in Set Top Boxes, Blu-ray DVD, DVR, DTV, Car Audio/Video and Security Camera.

Parametrics

TPS65251RHAT absloute maximum ratings: (1)Voltage range at VIN1,VIN2, VIN3, LX1, LX2, LX3: –0.3 to 18 V; (2)Voltage range at LX1, LX2, LX3 (maximum withstand voltage transient < 10 ns): –1 to 18 V; (3)Voltage at BST1, BST2, BST3, referenced to Lx pin: –0.3 to 7 V; (4)Voltage at V7V, COMP1, COMP2, COMP3: –0.3 to 7 V; (5)Voltage at V3V, RLIM1, RLIM2, RLIM3, EN1,EN2,EN3, SS1, SS2,SS3, FB1, FB2, FB3, PGOOD, SYNC, ROSC, LOW_P: –0.3 to 3.6 V; (6)Voltage at AGND, GND: –0.3 to 0.3 V; (7)TJ, Operating virtual junction temperature range: –40 to 125℃; (8)TSTG, Storage temperature range: –55 to 150℃.

Features

TPS65251RHAT features: (1)Wide Input Supply Voltage Range (4.5 V - 18 V); (2)Current-Mode Control With Simple Compensation Circuit; (3)0.8 V, 1% Accuracy Reference; (4)Power Good; (5)Soft Start Pins; (6)Continuous Loading: 3 A (Buck 1),2 A (Buck 2 and 3); (7)Optional Low Power Mode Operation for Light Loads; (8)Maximum Current: 3.5 A (Buck 1), 2.5 A (Buck 2 and 3); (9)QFN Package, 40-Pin 6 mm x 6 mm RHA; (10)Adjustable Switching Frequency 300 kHz - 2.2 MHz Set By External Resistor; (11)Dedicated Enable for Each Buck; (12)External Synchronization Pin for Oscillator; (13)External Enable/Sequencing and Soft Start Pins; (14)Adjustable Current Limit Set By External Resistor.

Diagrams