LT3091
36V, 1.5A Negative
Linear Regulator with
Programmable Current Limit
Fea T Descrip T
n
Output Current: 1.5A The LT 3091 is a 1.5A, low dropout negative linear
n
Single Resistor Sets Output Voltage regulator that is easily paralleled to increase output
n
current or spread heat on surface mounted boards.
50A SET Pin Current: 1% Initial Accuracy
n Designed with a precision current reference followed by a
Programmable Current Limit
n high performance rail-to-rail voltage buffer, this regulator
Positive or Negative Output Current Monitor
finds use in applications requiring precision output, high
n
Parallelable for Higher Current and Heat Spreading
current with no heat sink, output adjustability to zero and
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Low Dropout Voltage: 300mV
low dropout voltage. The device can also be configured
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Low Output Noise: 18V (10Hz to 100kHz)
RMS
as a 3-terminal floating regulator.
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Configurable as a 3-Terminal Floating Regulator
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Wide Input Voltage Range: 1.5V to 36V
The LT3091 features fast transient response, high PSRR
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Rail-to-Rail Output Voltage Range: 0V to 32V and output noise as low as 18V . The LT3091 generates
RMS
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Positive/Negative Shutdown Logic or UVLO a wide output voltage range (0V to 32V) while maintain-
n
ing unity gain operation. This yields virtually constant
Programmable Cable Drop Compensation
n bandwidth, load regulation, PSRR and noise, independent
Load Regulation: 1.2mV (1mA to 1.5A)
n of the programmed output voltage.
Stable with 10F Minimum Output Capacitor
n
Stable with Ceramic or Tantalum Capacitors
The LT3091 supplies 1.5A at a typical dropout voltage of
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Thermally Enhanced 14-Lead 4mm 3mm DFN,
300mV. Operating quiescent current is nominally 1.2mA
16-Lead TSSOP, 7-Lead TO-220 and DD Packages
and drops to << 1A in shutdown. A single resistor ad-
justs the LT3091s precision programmable current limit.
a T
The devices positive or negative current monitor either
n
Post Regulator for Switching Supplies
sources a current (0.25mA/A) or sinks a current (0.5mA/A)
n
Low Noise Instrumentation and RF Supplies
proportional to output current. Built-in protection includes
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Rugged Industrial Supplies reverse output protection, internal current limit with fold-
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back and thermal shutdown with hysteresis.
Precision Power Supplies
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Patent Pending.
Typical a T
TO ADC (IMON)
0.1F 49.9k
Output Noise: 10Hz to 100kHz
6.65k
10F
V
OUT
SET GND IMONP
OUT
2.5V
MAX I
OUT
1.5A
V
OUT
+
100V/DIV
10F
3091 G39
1ms/DIV
IN
V
IN
IMONN 3.3V
V : 3.5V
IN
3V TO 10V
SHDN ILIM
0.1F C : 10F, C : 0.1F
OUT
SET
V : 2.5V
OUT
3091 TA01a
5k
I : 1.5A
L
3091fa
1
For more information www.linear.com/LT3091
LT3091
50A
ion pplica
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ion uresLT3091
a Te Maxi Mu M r a T (Note 1)
IN Pin Voltage (Note 3) SET Pin Voltage
with Respect to GND Pin ...........................0.3V, 40V with Respect to IN Pin (Note 3) .................0.3V, 36V
ILIM Pin Voltage with Respect to GND Pin ....................................36V
with Respect to IN Pin (Note 3) ................0.3V, 0.7V SET Pin Current (Note 9)........................................5mA
IMONP Pin Voltage OUT Pin Voltage
with Respect to IN Pin (Note 3) .................0.3V, 40V with Respect to IN Pin (Note 3) .................0.3V, 36V
with Respect to GND Pin ............................40V, 20V with Respect to GND Pin ....................................36V
with Respect to IMONN Pin ........................40V, 20V Output Short-Circuit Duration .......................... Indefinite
IMONN Pin Voltage Operating Junction Temperature Range (Note 2)
with Respect to IN Pin (Note 3) .................0.3V, 40V E-, I-Grade ........................................ 40C to 125C
with Respect to GND Pin ............................40V, 20V MP-Grade ......................................... 55C to 150C
SHDN Pin Voltage H-Grade ............................................ 40C to 150C
with Respect to IN Pin (Note 3) .................0.3V, 55V Storage Temperature Range .................. 65C to 150C
with Respect to GND Pin ............................40V, 20V Lead Temperature (Soldering, 10 Sec)
FE, R, T7 Packages ..........................................300C
p in c F T
TOP VIEW
TOP VIEW
IN 1
16 OUT
IN 1 14 OUT
IN 2
15 OUT
IN 2 13 OUT
IN 3
14 OUT
IN 3 12 OUT
IN 4
13 OUT
15 17
IN 4 11 OUT
IN IN
ILIM 5
12 GND
ILIM 5 10 GND
IMONP 6
11 SET
IMONP 6 9 SET
IMONN 7
10 SHDN
IMONN 7 8 SHDN
NC 8
9 NC
DE PACKAGE
14-LEAD (4mm 3mm) PLASTIC DFN
FE PACKAGE
16-LEAD PLASTIC TSSOP
T = 150C, = 27C/W, = 5.5C/W
JMAX JA JC
EXPOSED PAD (PIN 15) IS IN, MUST BE SOLDERED TO PCB
T = 150C, = 25C/W, = 8C/W
JMAX JA JC
EXPOSED PAD (PIN 17) IS IN, MUST BE SOLDERED TO PCB
FRONT VIEW FRONT VIEW
7 OUT OUT
7
6 GND GND
6
SET
5 SET 5
TAB
TAB
IN
4 IN 4
IS IN
IS IN
SHDN
3 SHDN 3
IMONN
2 IMONN 2
ILIM
1 ILIM 1
T7 PACKAGE
R PACKAGE
7-LEAD PLASTIC TO-220
7-LEAD PLASTIC DD
T = 150C, = 15C/W, = 3C/W T = 150C, = 34C/W, = 3C/W
JMAX JA JC JMAX JA JC
3091fa
2
For more information www.linear.com/LT3091
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