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Linear Technology Electronic Components Datasheet

LT1936 Datasheet

1.4A 500kHz Step-Down Switching Regulator

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FEATURES
Wide Input Range: 3.6V to 36V
Short-Circuit Protected Over Full Input Range
1.9A Guaranteed Minimum Switch Current
5V at 1.4A from 10V to 36V Input
3.3V at 1.4A from 7V to 36V Input
5V at 1.2A from 6.3V to 36V Input
3.3V at 1.2A from 4.5V to 36V Input
Output Adjustable Down to 1.20V
500kHz Fixed Frequency Operation
Soft-Start
Uses Small Ceramic Capacitors
Internal or External Compensation
Low Shutdown Current: <2μA
Thermally Enhanced 8-Lead MSOP Package
APPLICATIONS
Automotive Battery Regulation
Industrial Control Supplies
Unregulated Wall Adapters
LT1936www.DataSheet4U.com
1.4A, 500kHz Step-Down
Switching Regulator
DESCRIPTION
The LT®1936 is a current mode PWM step-down DC/DC
converter with an internal 1.9A power switch, packaged
in a tiny, thermally enhanced 8-lead MSOP. The wide in-
put range of 3.6V to 36V makes the LT1936 suitable for
regulating power from a wide variety of sources, including
automotive batteries, 24V industrial supplies and unregu-
lated wall adapters. Its high operating frequency allows the
use of small, low cost inductors and ceramic capacitors,
resulting in low, predictable output ripple.
Cycle-by-cycle current limit, frequency foldback and
thermal shutdown provide protection against shorted
outputs, and soft-start eliminates input current surge
during start-up. Transient response can be optimized by
using external compensation components, or board space
can be minimized by using internal compensation. The
low current (<2μA) shutdown mode enables easy power
management in battery-powered systems.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
VIN
4.5V TO 36V
ON OFF
3.3V Step-Down Converter
VIN BOOST 0.22μF
SHDN
SW
4.7μF
LT1936
COMP
FB
VC GND
10k
10μH
17.4k
VOUT
3.3V
1.2A
22μF
1936 TA01a
95
VIN = 12V
90
Efficiency
VOUT = 5V
85
VOUT = 3.3V
80
75
70
65
0
0.5 1
LOAD CURRENT (A)
1.5
1936 TA01b
1936fd
1


Linear Technology Electronic Components Datasheet

LT1936 Datasheet

1.4A 500kHz Step-Down Switching Regulator

No Preview Available !

LT1936
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN Voltage................................................. –0.4V to 36V
BOOST Voltage .........................................................43V
BOOST Above SW Voltage ........................................20V
SHDN Voltage ............................................ –0.4V to 36V
FB, VC, COMP Voltage.................................................6V
Operating Temperature Range (Note 2)
LT1936E............................................... –40°C to 85°C
LT1936I.............................................. –40°C to 125°C
LT1936H ............................................ –40°C to 150°C
Maximum Junction Temperature
LT1936E, LT1936I ............................................. 125°C
LT1936H ........................................................... 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PIN CONFIGURATION
TOP VIEW
BOOST 1
8 COMP
VIN 2
SW 3
9
7 VC
6 FB
GND 4
5 SHDN
MS8E PACKAGE
8-LEAD PLASTIC MSOP
θJA = 40°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT1936EMS8E#PBF
LT1936EMS8E#TRPBF
LTBMT
8-Lead Plastic MSOP
LT1936IMS8E#PBF
LT1936IMS8E#TRPBF
LTBRV
8-Lead Plastic MSOP
LT1936HMS8E#PBF
LT1936HMS8E#TRPBF
LTBWB
8-Lead Plastic MSOP
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT1936EMS8E
LT1936EMS8E#TR
LTBMT
8-Lead Plastic MSOP
LT1936IMS8E
LT1936IMS8E#TR
LTBRV
8-Lead Plastic MSOP
LT1936HMS8E
LT1936HMS8E#TR
LTBWB
8-Lead Plastic MSOP
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 85°C
–40°C to 125°C
–40°C to 150°C
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°C
–40°C to 150°C
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VBOOST = 17V, unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Undervoltage Lockout
3.45 3.6
V
Quiescent Current
Quiescent Current in Shutdown
FB Voltage
VFB = 1.5V
VSHDN = 0V
1.175
1.8
0.1
1.200
2.5
2
1.215
mA
μA
V
FB Pin Bias Current (Note 4)
VFB = 1.20V, E and I Grades
H Grade
50 200
nA
50 300
nA
FB Voltage Line Regulation
Error Amp gm
Error Amp Voltage Gain
VIN = 5V to 36V
VC = 0.5V, IVC = ±5μA
VC = 0.8V, 1.2V
0.01 %/V
250 μS
150
1936fd
2


Part Number LT1936
Description 1.4A 500kHz Step-Down Switching Regulator
Maker Linear Technology
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LT1936 Datasheet PDF






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