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TPS65251N/a7avaiPMU with 3 DC/DC Converters, up to 18Vin
TPS65251RHARTIN/a11940avai4.5-V TO 18-V input, 3A/2A/2A output, synchronous triple buck converter 40-VQFN -40 to 125


TPS65251RHAR ,4.5-V TO 18-V input, 3A/2A/2A output, synchronous triple buck converter 40-VQFN -40 to 125features enable pin that• Dedicated Enable for Each Buckallows a delayed start-up for sequencing pu ..
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TPS65251-TPS65251RHAR
4.5-V TO 18-V input, 3A/2A/2A output, synchronous triple buck converter 40-VQFN -40 to 125
Support & Reference Product Order Tools & Technical Community Design Folder Now Documents Software TPS65251 SLVSAA4G – JUNE 2010 – REVISED FEBRUARY 2018 TPS65251 4.5-V to 18-V Input, High-Current, Synchronous Step-Down Three Buck Switcher With Integrated FET 1 Features 3 Description The TPS65251 features three synchronous wide 1• Wide Input Supply Voltage Range (4.5 to 18 V) input range high efficiency buck converters. The • 0.8 V, 1% Accuracy Reference converters are designed to simplify its application • Continuous Loading: 3 A (Buck 1), while giving the designer the option to optimize their 2 A (Buck 2 and 3) usage according to the target application. • Maximum Current: 3.5 A (Buck 1), The converters can operate in 5-, 9-, 12- or 15-V 2.5 A (Buck 2 and 3) systems and have integrated power transistors. The output voltage can be set externally using a resistor • Adjustable Switching Frequency divider to any value between 0.8 V and close to the 300 kHz to 2.2 MHz Set by External Resistor input supply. Each converter features enable pin that • Dedicated Enable for Each Buck allows a delayed start-up for sequencing purposes, • External Synchronization Pin for Oscillator soft-start pin that allows adjustable soft-start time by • External Enable/Sequencing and Soft-Start Pins choosing the soft-start capacitor, and a current limit (RLIMx) pin that enables designer to adjust current • Adjustable Current Limit Set By External Resistor limit by selecting an external resistor and optimize the • Soft-Start Pins choice of inductor. The current mode control allows a • Current-Mode Control With Simple Compensation simple RC compensation. Circuit The switching frequency of the converters can either • Powergood be set with an external resistor connected to ROSC • Optional Low-Power Mode Operation for Light pin or can be synchronized to an external clock connected to SYNC pin if needed. The switching Loads regulators are designed to operate from 300 kHz to • VQFN Package, 40-Pin 6 mm × 6 mm RHA 2.2 MHz. 180° out of phase operation between Buck 1 and Buck 2, 3 (Buck 2 and 3 run in phase) 2 Applications minimizes the input filter requirements. • Set Top Boxes (1) Device Information • Blu-ray DVD PART NUMBER PACKAGE BODY SIZE (NOM) • DVR TPS65251 VQFN (40) 6.00 mm × 6.00 mm • DTV (1) For all available packages, see the orderable addendum at • Car Audio/Video the end of the data sheet. • Security Camera Typical Application Schematic V2 GPIO or GND R22 C24 C1 C21 PG FB2 C2 C25 C26 R23 R20 FB2 C23 C27 4.7 nF GND EN2 C20 R21 VIN BST2 VIN VIN2 VIN VIN2 L2 VIN LX2 L3 L1 LX2 GND 4.7 μH TPS65251 V1 V3 LX3 LX1 LX3 LX1 VIN3 VIN1 C11 C31 VIN3 VIN1 C30 C10 BST3 BST1 EN3 EN1 C37 C17 R13 R30 R33 R10 C13 C33 120 k R1 C16 R12 C14 C36 R32 R31 C34 R11 C15 C35 GPIO or GND Copyright © 2018, 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. RLIM3 AGND SS3 V3V CMP3 V7V PGOOD FB3 SYNC GND LOW_P ROSC FB2 FB1 CMP1 CMP2 SS1 SS2 RLIM1 RLIM2
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