EmbeddedRelated.com
    Parts    Linear Tech / ADI LT Series Family    LTC7872ELXE    LTC7872ELXE#PBF
LTC7872ELXE#PBF

ADILTC7872ELXE#PBF

Analog Devices Inc.
Buck-Boost Regulator Positive Output Step-Up/Step-Down DC-DC Controller IC 48-eLQFP (7x7)
Datasheet Digi-Key Mouser Compare Prices

Overview

The LTC7872ELXE#PBF is a high-performance, 4-phase bidirectional buck-boost switching regulator controller designed for high voltage and high power applications. It operates with a supply voltage ranging from 1.2V to 100V, making it ideal for 48V automotive and industrial battery systems that require precise power management between two voltage rails. The controller features a synchronous rectifier architecture to maximize efficiency and can be configured for multi-phase operation to handle high current loads.

Why Choose This Part

The 4-phase architecture significantly reduces input and output capacitor requirements by minimizing ripple current. Its ability to operate up to 100V and achieve a 98% maximum duty cycle ensures robust performance in demanding high-side applications. The device also supports a programmable switching frequency from 70kHz to 710kHz, allowing engineers to optimize the design for efficiency or small footprint.

Applications

Automotive 48V/12V Dual Battery Systems
Managing bidirectional energy transfer between 12V and 48V electrical rails in mild-hybrid vehicles.
High Power Backup Battery Systems
Regulating charge and discharge cycles for industrial UPS systems or telecom power banks.
Bidirectional Motor Drive Power
Providing regulated voltage rails for heavy-duty DC motors that require regenerative braking support.
Redundant Power Supplies
Managing power distribution in high-reliability servers or networking hardware requiring wide input voltage swings.

Key Specifications

Function Step-Up/Step-Down
Topology Buck-Boost
Clock Sync Yes
Output Type PWM Signal
Mounting Type Surface Mount
Output Phases 4
Package / Case 48-LQFP Exposed Pad
Control Features Current Limit, Frequency Control, Power Good, Soft Start
Duty Cycle (Max) 98%
Number of Outputs 1
Output Configuration Positive
Frequency - Switching 70kHz ~ 710kHz
Operating Temperature -40degC ~ 125degC (TJ)
Synchronous Rectifier Yes
Supplier Device Package 48-eLQFP (7x7)
Voltage - Supply (Vcc/Vdd) 1.2V ~ 100V

Getting Started

Designers should begin by using the LTpowerCAD II design tool to calculate component values and estimate power loss for specific rail requirements. For physical evaluation, the DC2481A demonstration circuit is the standard platform for testing the LTC7872 in bidirectional configurations. Ensure proper thermal management and low-ESR capacitor selection as per the layout guidelines in the 48-eLQFP package documentation.