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LT1933

Linear Technology
Part Number LT1933
Manufacturer Linear Technology
Description Step-Down Switching Regulator
Published Apr 21, 2010
Detailed Description FEATURES n Wide Input Range: 3.6V to 36V n 5V at 600mA from 16V to 36V Input n 3.3V at 600mA from 12V to 36V Input n 5V ...
Datasheet PDF File LT1933 PDF File

LT1933
LT1933


Overview
FEATURES n Wide Input Range: 3.
6V to 36V n 5V at 600mA from 16V to 36V Input n 3.
3V at 600mA from 12V to 36V Input n 5V at 500mA from 6.
3V to 36V Input n 3.
3V at 500mA from 4.
5V to 36V Input n Fixed Frequency 500kHz Operation n Uses Tiny Capacitors and Inductors n Soft-Start n Internally Compensated n Low Shutdown Current: <2μA n Output Adjustable Down to 1.
25V n Low Profile (1mm) SOT-23 (ThinSOT™) and (2mm × 3mm × 0.
75mm) 6-Pin DFN Packages APPLICATIONS n Automotive Battery Regulation n Industrial Control Supplies n Wall Transformer Regulation n Distributed Supply Regulation n Battery-Powered Equipment LT1933 600mA, 500kHz Step-Down Switching Regulator in SOT-23 and DFN Packages DESCRIPTION The LT®1933 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.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION VIN 4.
5V TO 36V OFF ON 3.
3V Step-Down Converter VIN BOOST LT1933 SHDN SW GND FB 16.
5k 1N4148 0.
1μF 22μH MBRM140 2.
2μF 10k VOUT 3.
3V/500mA 22μF 1933 TA01a EFFICIENCY (%) Efficiency 95 VIN = 12V 90 VOUT = 5V 85 VOUT = 3.
3V 80 75 70 65 0 100 200 300 400 500 600 LOAD CURRENT (mA) 1933 TA01b 1...


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