|
LT1936 Datasheet, PDF (1/20 Pages) Linear Technology – 1.4A, 500kHz Step-Down Switching Regulator | |||
|
FEATURES
â Wide Input Range: 3.6V to 36V
â Short-Circuit Protected Over Full Input Range
â 1.9A Guaranteed Minimum Switch Current
â 5V at 1.4A from 10V to 36V Input
â 3.3V at 1.4A from 7V to 36V Input
â 5V at 1.2A from 6.3V to 36V Input
â 3.3V at 1.2A from 4.5V to 36V Input
â Output Adjustable Down to 1.20V
â 500kHz Fixed Frequency Operation
â Soft-Start
â Uses Small Ceramic Capacitors
â Internal or External Compensation
â Low Shutdown Current: <2µA
â Thermally Enhanced 8-Lead MSOP Package
U
APPLICATIO S
â Automotive Battery Regulation
â Industrial Control Supplies
â Unregulated Wall Adapters
LT1936
1.4A, 500kHz Step-Down
Switching Regulator
DESCRIPTIO
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 input
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 capaci-
tors, resulting in low, predictable output ripple.
Cycle-by-cycle current limit, frequency foldback and ther-
mal 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 mini-
mized by using internal compensation. The low current
(<2µA) shutdown mode enables easy power management
in battery-powered systems.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
VIN
4.5V TO 36V
ON OFF
3.3V Step-Down Converter
VIN BOOST
SHDN
SW
4.7µF
LT1936
COMP
FB
VC GND
0.22µF
10µH
17.4k
10k
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
1936fa
1
|
▷ |