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LT3090 Datasheet(PDF) 1 Page - Linear Technology

Part No. LT3090
Description  –36V, 600mA Negative Linear Regulator with Programmable Current Limit
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT3090 Datasheet(HTML) 1 Page - Linear Technology

   
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1
dc1948af
DEMO MANUAL DC1948A
Description
LT3090
–36V, 600mA Negative Linear Regulator
with Programmable Current Limit
Demonstration circuit 1948A is a 600mA low dropout
negativelinearregulatorfeaturingtheLT®3090.Thisdevice
isdesignedforapplicationsrequiringnegativeoutputvolt-
age, high current with no heat sink, output adjustability to
zero and low dropout voltage.
The LT3090 features fast transient response, high PSRR
and low output noise. The LT3090 supplies 600mA at a
typicaldropoutvoltageof300mV.Operatingquiescentcur-
rent is nominally 1mA and drops to << 1μA in shutdown.
A single resistor adjusts the LT3090’s precision program-
mable current limit. The LT3090’s positive or negative
current monitor either sources a current (0.5mA/A) or
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
performance summary
sinks a current (1mA/A) proportional to output current.
Built-in protection includes reverse output protection,
internal current limit with foldback and thermal shutdown
with hysteresis.
The LT3090 is offered in a 10 pin DFN package and a
16-lead MSOP package.
The LT3090 data sheet gives a complete description of
thedevice,operationandapplicationinformation.Thedata
sheet should be read in conjunction with this quick start
guide for working on or modifying the demo circuit 1948A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1948A
Specifications are at TA = 25°C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIN
Input Supply Range
VOUT = 1.2V, IOUT1 = 1mA
–36
–1.5
V
VOUT
Output Voltage
Shunt at 1, 2 for JP1
–1.286
–1.25
–1.213
V
Shunt at 3, 4 for JP1
–2.575
–2.5
–2.425
V
Shunt at 5, 6 for JP1
–5.15
–5
–4.85
V
Shunt at 7, 8 for JP1
–12.36
–12
–11.64
V
Shunt at 9, 10 for JP1
–15.45
–15
–14.55
V
Shunt at 11, 12 for JP1 and R10 Stuffed as 357kΩ
–18.54
–18
–17.46
V
IOUT
Output Current
R1 = 10k, (Note 1)
600
mA
Note 1. This is for the typical condition when VIN – VOUT < 5V. Current limit varies with different values of VIN – VOUT. Refer to the LT3090 data sheet
for details.


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