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LTC3780EG#PBF

ADILTC3780EG#PBF

Analog Devices Inc.
Buck-Boost Regulator Positive Output Step-Up/Step-Down DC-DC Controller IC 24-SSOP
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Overview

The LTC3780EG#PBF is a step-up/step-down (buck-boost) DC-DC controller IC in a 24-SSOP package that drives external power transistors to produce a regulated positive output when input can be above or below the output. It includes practical control features such as current limit, enable, power-good, and soft-start and supports very high duty cycles (listed as up to 99%). This device is intended for designs that need an adjustable, high-efficiency regulated rail from a varying supply.

Why Choose This Part

Using a single buck-boost controller removes the need for separate boost and buck converters and simplifies designs that must tolerate inputs above or below the target output. The transistor-driver output lets you choose MOSFETs for the current and efficiency you need, and integrated features such as current limit, power-good, enable and soft-start simplify protection, sequencing and fault handling. The 24-SSOP package is compact yet manageable for power PCB layouts.

Applications

Battery-powered systems
Maintain a regulated output as battery voltage falls below or rises above the required load voltage (portable instruments, medical devices).
Distributed power rails
Generate a stable board rail when input can vary widely from upstream converters or bus voltages in industrial/telecom equipment.
Solar + battery systems
Regulate a load from solar panels and battery sources where input can swing above and below the desired output.
Point-of-load conversion with external MOSFET choice
High-current point-of-load applications where designers want to select MOSFETs and inductors for optimized efficiency and thermal performance.

Key Specifications

Function Step-Up/Step-Down
Topology Buck-Boost
Clock Sync No
Output Type Transistor Driver
Mounting Type Surface Mount
Output Phases 1
Package / Case 24-SSOP (0.209", 5.30mm Width)
Control Features Current Limit, Enable, Power Good, Soft Start
Duty Cycle (Max) 99%
Number of Outputs 1
Output Configuration Positive
Frequency - Switching 200kHz ~ 400kHz
Operating Temperature -40degC ~ 85degC (TJ)
Synchronous Rectifier Yes
Supplier Device Package 24-SSOP
Voltage - Supply (Vcc/Vdd) 4V ~ 30V

Getting Started

Start with the manufacturer's datasheet and reference schematics to pick MOSFETs, inductor and compensation components that match your load and switching conditions. Follow the layout and grounding recommendations in the datasheet, and verify switching waveforms and current limit with an oscilloscope and current probe during bring-up. Use standard power-supply design practices (gate drive decoupling, short high-current loops, proper thermal planning).

Part of Linear Tech / ADI LT Series family » LTC3780EG

LTC3780EG Family

Part NumberDifferenceStock
LTC3780EG#TRPBF (Analog Devices) TRPBF 826

Also Consider

TPS63060 TITexas Instruments - Widely used buck-boost converter IC for battery-powered applications with an integrated switching solution alternative.
TPS63070 TITexas Instruments - Another TI buck-boost family member offering an integrated converter option for designs that prefer fewer external power MOSFET choices.
LM5175 TITexas Instruments - A synchronous buck-boost controller option suitable for applications requiring four-switch topologies and robust control features.

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