LT1933 - 600mA, 500kHz Step-Down Switching Regulator in SOT-23

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.

Features
  • 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 x 3mm x 0.75mm) 6-Pin DFN Packages
Typical Application
LT1933 Typical Application
LT1933 Typical Application
Applications
  • Automotive Battery Regulation
  • Industrial Control Supplies
  • Wall Transformer Regulation
  • Distributed Supply Regulation
  • Battery-Powered Equipment
Packaging
LT1933 Package Drawing
LT1933 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LT1933ES6#TRMPBFSOT-23E$2.79$2.00
LT1933ES6#TRPBFSOT-23E$2.79$1.95
LT1933HDCB#PBF2x3 DFN-6H$3.56
LT1933HDCB#TRMPBF2x3 DFN-6H$3.56$2.54
LT1933HDCB#TRPBF2x3 DFN-6H$3.56$2.49
LT1933HS6#PBFSOT-23H$3.56
LT1933HS6#TRMPBFSOT-23H$3.56$2.54
LT1933HS6#TRPBFSOT-23H$3.56$2.49
LT1933IDCB#PBF2x3 DFN-6I$3.20
LT1933IDCB#TRMPBF2x3 DFN-6I$3.20$2.29
LT1933IDCB#TRPBF2x3 DFN-6I$3.20$2.24
LT1933IS6#PBFSOT-23I$3.20
LT1933IS6#TRMPBFSOT-23I$3.20$2.29
LT1933IS6#TRPBFSOT-23I$3.20$2.24
Demo Boards
Part NumberDescriptionPrice
DC1092ALT1933HDCB Demo Board | (DFN) H-Grade Temp, 4.5V ≤ VIN ≤ 36V, Vout = 3.3V @ 500mAContact Factory
DC662ALT1933ES6 Demo Board | (TSOT) 4.5V ≤ VIN ≤ 36V, Vout = 3.3V @ 500mA$150.00
Datasheet
Design Note
Reliability Data
CAD Symbol
LTspice
Related Products
LT1933 - 600mA, 500kHz Step-Down Switching Regulator in SOT-23
DN367 - Tiny Versatile Buck Regulators Operate from 3.6V to 36V Input
R388 Reliability Data
LT1933 Footprints and Symbols
LT1933 Demo Circuit - 600mA, 500kHz Step-Down Regulator (12V to 3.3V @ 500mA)