LT1936

PRODUCTION

1.4A, 500kHz Step-Down Switching Regulator

Data Sheet Product Selection Table
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Overview

  • Wide Input Range: 3.6V to 36V
  • Short-Circuit Protected Over Full Input Range
  • 1.9A Guaranteed Minimum Switch Current
  • 5V at 1.4A from 10V to 36V Input
  • 3.3V at 1.4A from 7V to 36V Input
  • 5V at 1.2A from 6.3V to 36V Input
  • 3.3V at 1.2A from 4.5V to 36V Input
  • Output Adjustable Down to 1.20V
  • 500kHz Fixed Frequency Operation
  • Soft-Start
  • Uses Small Ceramic Capacitors
  • Internal or External Compensation
  • Low Shutdown Current: <2µA
  • Thermally Enhanced 8-Lead MSOP Package

The LT1936 is a current mode PWM step-down DC/DC converter with an internal 1.9A power switch, packaged in a tiny, thermally enhanced 8-lead MSOP. The wide input range of 3.6V to 36V makes the LT1936 suitable for regulating power from a wide variety of sources, including automotive batteries, 24V industrial supplies and unregulated wall adapters. Its high operating frequency allows the use of small, low cost inductors and ceramic capacitors, resulting in low, predictable output ripple.

Cycle-by-cycle current limit, frequency foldback and thermal shutdown provide protection against shorted outputs, and soft-start eliminates input current surge during startup. Transient response can be optimized by using external compensation components, or board space can be minimized by using internal compensation. The low current (<2µA) shutdown mode enables easy power management in battery-powered systems.

Applications

  • Automotive Battery Regulation
  • Industrial Control Supplies
  • Unregulated Wall Adapters
LT1936
1.4A, 500kHz Step-Down Switching Regulator
3.3V Step-Down Converter Efficiency Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 1

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
Circuit Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
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 1

Models for the following parts are available in LTspice:

  • LT1936
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.

Evaluation Kits

eval board
schematic 1
DC825A

LT1936EMS8E Demo Board | VIN = 4.5V to 36V, VOUT = 5V or 3.3V @1.2A

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Product Details

Demonstration circuit 825 is a monolithic step-down DC/DC switching regulator featuring the LT1936. The demo board is optimized for 3.3V output at 1.2A from a 4.5V to 36V input or a 5V, 1.2A output from a 6.8V to 36V input. The output is selectable by placing the JP1 jumper at the 3.3V or 5V position.
DC825A
LT1936EMS8E Demo Board | VIN = 4.5V to 36V, VOUT = 5V or 3.3V @1.2A
DC825A - Schematic

Latest Discussions

2 Years Ago
I use LT1936 to creat 5V output，Io=70mA，when VIN=10V,Io=70mA，When VIN=24V，Io=70mA，and the chip heats seriously。Please help me。
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