LT3091EDE Datasheet, PDF (1/8 Pages) Linear Technology – –36V, 1.5A Negative Linear Regulator

DEMO MANUAL DC2276A
LT3091EDE
–36V, 1.5A Negative Linear Regulator
with Programmable Current Limit
Description
Demonstration circuit DC2276A is a 1.5A low dropout
negative linear regulator featuring the LT^®3091. This device
is designed for applications requiring negative output volt-
age, high current without a heat sink, output adjustability
to zero and low dropout voltage.
The LT3091 features fast transient response, high PSRR
and output noise as low as 18µV_RMS. The LT3091 generates
a wide output voltage range (0V to –32V) while maintain-
ing unity gain operation. This yields virtually constant
bandwidth, load regulation, PSRR and noise, independent
of the programmed output voltage.
The LT3091 supplies 1.5A at a typical dropout voltage of
300mV. Operating quiescent current is nominally 1.2mA
and drops to <<1µA in shutdown. A single resistor adjusts
the LT3091’s precision programmable current limit. The
LT3091’s positive or negative current monitor either
sources a current (0.25mA/A) or sinks a current (0.5mA/A)
proportional to output current.
Built-in protection includes reverse output protection,
internal current limit with foldback and thermal shutdown
with hysteresis.
DC2276A uses the LT3091EDE which is a 14-lead (4mm
x 3mm) plastic DFN package with an exposed pad on the
bottom side of the IC for better thermal performance.
These features make DC2276A an ideal circuit for surface-
mount power supplies, rugged industrial power supplies,
low output voltage supplies and as a post regulator for
switching supplies.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2276A
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Technology Corporation. All other trademarks are the property of their respective owners.
Board Photo
dc2276af
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