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Linear Technology Electronic Components Datasheet

LT1933 Datasheet

Step-Down Switching Regulator

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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 manage-
ment 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
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
1933fe
1


Linear Technology Electronic Components Datasheet

LT1933 Datasheet

Step-Down Switching Regulator

No Preview Available !

LT1933
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Voltage (VIN)..................................... –0.4V to 36V
BOOST Pin Voltage ...................................................43V
BOOST Pin Above SW Pin.........................................20V
SHDN Pin................................................... –0.4V to 36V
FB Voltage.................................................... –0.4V to 6V
Operating Temperature Range (Note 2)
LT1933E...................................................–40°C to 85°C
LT1933I.................................................. –40°C to 125°C
LT1933H ................................................ –40°C to 150°C
Maximum Junction Temperature
LT1933E, LT1933I ................................................. 125°C
LT1933H ............................................................... 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature, S6 Package
(Soldering, 10 sec)............................................ 300°C
PIN CONFIGURATION
TOP VIEW
BOOST 1
6 FB
VIN 2
7
5 GND
SW 3
4 SHDN
DCB PACKAGE
6-LEAD (2mm × 3mm) PLASTIC DFN
θJA = 73.5°C/W, θJC = 12°C/W
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
BOOST 1
GND 2
FB 3
TOP VIEW
6 SW
5 VIN
4 SHDN
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
θJA = 165°C/W, θJC = 102°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT1933IDCB#PBF
LT1933IDCB#TRPBF
LCGM
6-Lead (2mm × 3mm) Plastic DFN
LT1933HDCB#PBF
LT1933HDCB#TRPBF LCGN
6-Lead (2mm × 3mm) Plastic DFN
LT1933ES6#PBF
LT1933ES6#TRPBF
LTAGN
6-Lead Plastic TSOT-23
LT1933IS6#PBF
LT1933IS6#TRPBF
LTAGP
6-Lead Plastic TSOT-23
LT1933HS6#PBF
LT1933HS6#TRPBF
LTDDQ
6-Lead Plastic TSOT-23
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT1933IDCB
LT1933IDCB#TR
LCGM
6-Lead (2mm × 3mm) Plastic DFN
LT1933HDCB
LT1933HDCB#TR
LCGN
6-Lead (2mm × 3mm) Plastic DFN
LT1933ES6
LT1933ES6#TR
LTAGN
6-Lead Plastic TSOT-23
LT1933IS6
LT1933IS6#TR
LTAGP
6-Lead Plastic TSOT-23
LT1933HS6
LT1933HS6#TR
LTDDQ
6-Lead Plastic TSOT-23
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 150°C
–40°C to 85°C
–40°C to 125°C
–40°C to 150°C
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 150°C
–40°C to 85°C
–40°C to 125°C
–40°C to 150°C
1933fe
2


Part Number LT1933
Description Step-Down Switching Regulator
Maker Linear Technology
PDF Download

LT1933 Datasheet PDF






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