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LT1933HDCB-PBF Datasheet(PDF) 1 Page - Linear Technology

Part # LT1933HDCB-PBF
Description  600mA, 500kHz Step-Down Switching Regulator in SOT-23 and DFN Packages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1933HDCB-PBF Datasheet(HTML) 1 Page - Linear Technology

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LT1933
1
1933fd
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
600mA, 500kHz Step-Down
Switching Regulator in SOT-
23 and DFN Packages
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.
3.3V Step-Down Converter
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 x 3mm x 0.75mm) 6-Pin DFN Packages
n Automotive Battery Regulation
n Industrial Control Supplies
n Wall Transformer Regulation
n Distributed Supply Regulation
n Battery-Powered Equipment
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.
Efficiency
VIN
4.5V TO 36V
OFF ON
0.1μF
22μH
1N4148
MBRM140
10k
16.5k
22μF
1933 TA01a
2.2μF
VOUT
3.3V/500mA
VIN
BOOST
GND
FB
SHDN
SW
LT1933
LOAD CURRENT (mA)
0
90
95
300
400
1933 TA01b
85
80
100
200
600
500
75
70
65
VIN = 12V
VOUT = 5V
VOUT = 3.3V


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