LT1933

PRODUCTION

600mA, 500kHz Step-Down Switching Regulator in SOT-23 and DFN Packages

Data Sheet Product Selection Table
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Overview

  • Wide Input Range: 3.6V to 36V
  • 5V at 600mA from 16V to 36V Input
  • 3.3V at 600mA from 12V to 36V Input
  • 5V at 500mA from 6.3V to 36V Input
  • 3.3V at 500mA from 4.5V to 36V Input
  • Fixed Frequency 500kHz Operation
  • Uses Tiny Capacitors and Inductors
  • Soft-Start
  • Internally Compensated
  • Low Shutdown Current: <2µA
  • Output Adjustable Down to 1.25V
  • Low Profile (1mm) SOT-23 (ThinSOT™) and (2mm × 3mm × 0.75mm) 6-Pin DFN Packages

The LT1933 is a current mode PWM step-down DC/DC converter with an internal 0.75A power switch, packaged in a tiny 6-lead SOT-23. The wide input range of 3.6V to 36V makes the LT1933 suitable for regulating power from a wide variety of sources, including unregulated wall transformers, 24V industrial supplies and automotive batteries. Its high operating frequency allows the use of tiny, low cost inductors and ceramic capacitors, resulting in low, predictable output ripple.

Cycle-by-cycle current limit provides protection against shorted outputs, and soft-start eliminates input current surge during start up. The low current (<2µA) shutdown provides output disconnect, enabling easy power management in battery-powered systems.

Applications

  • Automotive Battery Regulation
  • Industrial Control Supplies
  • Wall Transformer Regulation
  • Distributed Supply Regulation
  • Battery-Powered Equipment
LT1933
600mA, 500kHz Step-Down Switching Regulator in SOT-23 and DFN Packages
3.3V Step-Down Converter Efficiency Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

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
Protection Switches & Controllers 2
LTC4359
RECOMMENDED FOR NEW DESIGNS Ideal Diode Controller with Reverse Input Protection
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT1933
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
DC662A

LT1933ES6 Demo Board | (TSOT) 4.5V ≤ VIN ≤ 36V, VOUT = 3.3V @ 500mA

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Product Details

Demonstration circuit 662 is a monolithic step-down DC/DC switching converter featuring the LT1933 in the TSOT-23-6 package. The board is optimized for 3.3V output at up to 500mA load current and requires an input voltage ranging from 4.5V to 36V.

eval board
schematic 2
DC1092A

LT1933HDCB Demo Board | (DFN) H-Grade Temp, 4.5V ≤ VIN ≤ 36V, VOUT = 3.3V @ 500mA

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Product Details

Demonstration circuit 1092 is a monolithic step-down DC/DC switching converter featuring the LT1933H in the 2×3 DFN-6 package and operating over the H-grade temperature range. The board is optimized for 3.3V output at up to 500mA load current and requires an input voltage ranging from 4.5V to 36V.


 
DC662A
LT1933ES6 Demo Board | (TSOT) 4.5V ≤ VIN ≤ 36V, VOUT = 3.3V @ 500mA
DC662A - Schematic
DC1092A
LT1933HDCB Demo Board | (DFN) H-Grade Temp, 4.5V ≤ VIN ≤ 36V, VOUT = 3.3V @ 500mA
DC1092A - Schematic

Latest Discussions

2 Years Ago
Get symetrical voltage +5V;-5V using double LT1933?
2 Years Ago
Symmetrical voltage from single +20V non stabilized - is the proposed solution correct?
4 Years Ago
LT1933 SOT23 package dimension
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