LTC1772B

PRODUCTION

Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23

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Overview

  • Burst Mode® Operation Disabled for Lower Output Ripple at Light Loads
  • High Efficiency: Up to 94%
  • High Output Currents Easily Achieved
  • Wide VIN Range: 2.5V to 9.8V
  • Constant Frequency 550kHz Operation
  • Low Dropout: 100% Duty Cycle
  • Output Voltage down to 0.8V
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Shutdown Mode Draws Only 8µA Supply Current
  • Tiny 6-Lead SOT-23 Package

The LTC1772B is a constant frequency current mode step-down DC/DC controller providing excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage lockout feature that shuts down the LTC1772B when the input voltage falls below 2.0V.

The LTC1772B provides a ±2.5% output voltage accuracy and consumes only 270µA of quiescent current. In shutdown, the device draws a mere 8µA.

To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle). High constant operating frequency of 550kHz allows the use of a small external inductor.

The LTC1772B is available in a small footprint 6-lead SOT-23.

For a Burst Mode operation enabled version of the LTC1772B, please refer to the LTC1772 data sheet.

Applications

  • One or Two Lithium-Ion-Powered Applications
  • Cellular Telephones
  • Wireless Devices
  • Portable Computers
  • Distributed 3.3V, 2.5V or 1.8V Power Systems
LTC1772B
Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23
Figure 1. High Effi ciency, High Output Current 2.5V/2A Regulator Efficiency vs Load Current* Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

Burst Mode
LTC1772 Yes
LTC1772B No
Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC1772BES6#TRMPBF 6-Lead TSOT-23
LTC1772BES6#TRPBF 6-Lead TSOT-23
LTC1772BIS6#TRMPBF 6-Lead TSOT-23
LTC1772BIS6#TRPBF 6-Lead TSOT-23
Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Switching Regulators & Controllers 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC1772
  • LTC1772B
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Latest Discussions

2 Years Ago
LTC1772B Undervoltage Lockout
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