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LT3970HMS#PBF

ADILT3970HMS#PBF

Analog Devices Inc.
Buck Switching Regulator IC Positive Adjustable 1.21V 1 Output 350mA 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
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Overview

The LT3970HMS#PBF is a compact, high-efficiency monolithic buck switching regulator designed for low current applications. It operates over a wide input voltage range of 4.2V to 40V, making it suitable for unregulated power sources including automotive batteries and industrial 24V rails. Its low quiescent current and Burst Mode operation maintain high efficiency even at very light loads.

Why Choose This Part

The LT3970HMS#PBF features a remarkably low quiescent current of only 2.8 microamps, which is critical for extending battery life in standby modes. It integrates a power switch and catch diode on-chip to reduce PCB footprint, while the H-grade rating ensures reliable operation in high-temperature environments up to 150 degrees Celsius.

Applications

Automotive Power Systems
Regulation of 12V vehicle batteries down to 3.3V or 5V logic levels with protection against load dump transients up to 40V.
Industrial Control Loops
Providing localized power for 4-20mA sensors and instrumentation from a standard 24V DC bus.
Handheld Battery Equipment
Stepping down multi-cell Lithium or alkaline stacks while preserving battery life during standby through its low quiescent current.
Keep-Alive Supplies
Ideal for powering microcontrollers and memory in 'always-on' systems that require minimal power consumption when the main system is powered down.

Key Specifications

Function Step-Down
Topology Buck
Output Type Adjustable
Mounting Type Surface Mount
Package / Case 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Current - Output 350mA
Number of Outputs 1
Output Configuration Positive
Frequency - Switching 200kHz ~ 2.25MHz
Operating Temperature -40degC ~ 150degC (TJ)
Synchronous Rectifier No
Voltage - Input (Max) 40V
Voltage - Input (Min) 4.2V
Voltage - Output (Max) 25V
Supplier Device Package 10-MSOP
Voltage - Output (Min/Fixed) 1.21V

Getting Started

Designers should prioritize the layout of the input capacitor and catch diode loop to minimize EMI. Use a low-ESR ceramic capacitor placed as close as possible to the VIN and GND pins. Use the LTpowerCAD tool from Analog Devices to calculate component values for the feedback network and inductor selection based on your specific output requirements.