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LT1933IDCB-PBF

Description
600mA, 500kHz Step-Down Switching Regulator in SOT-23 and DFN Packages
File Size356KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LT1933IDCB-PBF Overview

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

FEATURES
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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 manage-
ment in battery-powered systems.
L,
LT, LTC and LTM 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.
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
APPLICATIONS
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Automotive Battery Regulation
Industrial Control Supplies
Wall Transformer Regulation
Distributed Supply Regulation
Battery-Powered Equipment
TYPICAL APPLICATION
3.3V Step-Down Converter
95
V
IN
4.5V TO 36V
1N4148
V
IN
BOOST
LT1933
OFF ON
SHDN
GND
SW
FB
16.5k
2.2μF
10k
MBRM140
0.1μF
22μH
90
V
OUT
3.3V/500mA
EFFICIENCY (%)
85
V
OUT
= 3.3V
80
75
70
1933 TA01a
Efficiency
V
IN
= 12V
V
OUT
= 5V
22μF
65
0
100
300
400
LOAD CURRENT (mA)
200
500
600
1933 TA01b
1933fd
1

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