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LT1936H 查看數據表(PDF) - Linear Technology

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LT1936H Datasheet PDF : 20 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
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
LT1936
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

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