Analog Devices LTC3872-1

Description

The LTC®3872-1 is a constant frequency current mode boost DC/DC controller that drives an N-channel power MOSFET and requires very few external components. The No RSENSETM architecture eliminates the need for a sense resistor, improves efficiency and saves board space.

The LTC3872-1 provides excellent AC and DC load and line regulation with ±1.5% output voltage accuracy. It incorporates an undervoltage lockout feature that shuts down the device when the input voltage falls below 2.3V.

LTC3872-1 has the same functionality as the standard LTC3872 except that it has no frequency foldback in current limit.

High switching frequency of 550kHz allows the use of a small inductor. The LTC3872-1 is available in an 8-lead low profile (1mm) ThinSOTTM package and 8-pin 2mm × 3mm DFN package.

Features

• No Current Sense Resistor Required
• VOUT up to 60V
• Constant Frequency 550kHz Operation
• Internal Soft-Start and Optional External Soft-Start
• Adjustable Current Limit
• Pulse Skipping at Light Load
• VIN Range: 2.75V to 9.8V
• ±1.5% Voltage Reference Accuracy
• Current Mode Operation for Excellent Line and Load Transient Response
• Low Profile (1mm) SOT-23 and 2mm × 3mm DFN Packages

Typical applications

• IP Phone Power Supplies
• 42V Automotive Systems
• 24V Industrial Controls
• Telecom Power Supplies

More information

• Datasheet
• IC product information