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Linear Technology Electronic Components Datasheet

LT3091IFE Datasheet

1.5A Negative Linear Regulator

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LT3091
–36V, 1.5A Negative
Linear Regulator with
Programmable Current Limit
Features
Description
nn Output Current: 1.5A
nn Single Resistor Sets Output Voltage
nn 50µA SET Pin Current: ±1% Initial Accuracy
nn Programmable Current Limit
nn Positive or Negative Output Current Monitor
nn Parallelable for Higher Current and Heat Spreading
nn Low Dropout Voltage: 300mV
nn Low Output Noise: 18µVRMS (10Hz to 100kHz)
nn Configurable as a 3-Terminal Floating Regulator
nn Wide Input Voltage Range: –1.5V to –36V
nn Rail-to-Rail Output Voltage Range: 0V to –32V
nn Positive/Negative Shutdown Logic or UVLO
nn Programmable Cable Drop Compensation
nn Load Regulation: 1.2mV (1mA to 1.5A)
nn Stable with 10µF Minimum Output Capacitor
nn Stable with Ceramic or Tantalum Capacitors
nn Thermally Enhanced 14-Lead 4mm × 3mm DFN,
16-Lead TSSOP, 7-Lead TO-220 and DD Packages
Applications
nn Post Regulator for Switching Supplies
nn Low Noise Instrumentation and RF Supplies
nn Rugged Industrial Supplies
nn Precision Power Supplies
The LT®3091 is a 1.5A, low dropout negative linear
regulator that is easily paralleled to increase output
current or spread heat on surface mounted boards.
Designed with a precision current reference followed by a
high performance rail-to-rail voltage buffer, this regulator
finds use in applications requiring precision output, high
current with no heat sink, output adjustability to zero and
low dropout voltage. The device can also be configured
as a 3-terminal floating regulator.
The LT3091 features fast transient response, high PSRR
and output noise as low as 18µVRMS. 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 ad-
justs the LT3091’s precision programmable current limit.
The device’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 fold-
back and thermal shutdown with hysteresis.
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 Application
0.1µF 49.9k
LT3091 SET
GND
+
TO ADC (IMON)
6.65k
IMONP OUT
10µF
VOUT
–2.5V
MAX IOUT
1.5A
VIN
–3V TO –10V
10µF
IN
50µA
SHDN
ILIM
5k
IMONN
3.3V
0.1µF
3091 TA01a
Output Noise: 10Hz to 100kHz
VOUT
100µV/DIV
1ms/DIV
VIN: –3.5V
COUT: 10µF, CSET: 0.1µF
VOUT: –2.5V
IL: 1.5A
3091 G39
For more information www.linear.com/LT3091
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1


Linear Technology Electronic Components Datasheet

LT3091IFE Datasheet

1.5A Negative Linear Regulator

No Preview Available !

LT3091
Absolute Maximum Ratings (Note 1)
IN Pin Voltage (Note 3)
with Respect to GND Pin............................0.3V, –40V
ILIM Pin Voltage
with Respect to IN Pin (Note 3).................–0.3V, 0.7V
IMONP Pin Voltage
with Respect to IN Pin (Note 3)..................–0.3V, 40V
with Respect to GND Pin.............................–40V, 20V
with Respect to IMONN Pin.........................–40V, 20V
IMONN Pin Voltage
with Respect to IN Pin (Note 3)..................–0.3V, 40V
with Respect to GND Pin.............................–40V, 20V
SHDN Pin Voltage
with Respect to IN Pin (Note 3)..................–0.3V, 55V
with Respect to GND Pin.............................–40V, 20V
SET Pin Voltage
with Respect to IN Pin (Note 3)..................–0.3V, 36V
with Respect to GND Pin.....................................±36V
SET Pin Current (Note 9)........................................±5mA
OUT Pin Voltage
with Respect to IN Pin (Note 3)..................–0.3V, 36V
with Respect to GND Pin.....................................±36V
Output Short-Circuit Duration........................... Indefinite
Operating Junction Temperature Range (Note 2)
E-, I-Grade......................................... –40°C to 125°C
MP-Grade.......................................... –55°C to 150°C
H-Grade............................................. –40°C to 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 Sec)
FE, R, T7 Packages ........................................... 300°C
Pin Configuration
TOP VIEW
IN 1
IN 2
IN 3
IN 4
ILIM 5
IMONP 6
IMONN 7
14 OUT
13 OUT
12 OUT
15
IN
11 OUT
10 GND
9 SET
8 SHDN
DE PACKAGE
14-LEAD (4mm × 3mm) PLASTIC DFN
TJMAX = 150°C, θJA = 27°C/W, θJC = 5.5°C/W
EXPOSED PAD (PIN 15) IS IN, MUST BE SOLDERED TO PCB
FRONT VIEW
7
OUT
6
GND
TAB
5
SET
IS IN
4
IN
3
SHDN
2
IMONN
1
ILIM
R PACKAGE
7-LEAD PLASTIC DD
TJMAX = 150°C, θJA = 15°C/W, θJC = 3°C/W
TOP VIEW
IN 1
IN 2
IN 3
IN 4
ILIM 5
IMONP 6
IMONN 7
NC 8
16 OUT
15 OUT
14 OUT
17
13 OUT
IN
12 GND
11 SET
10 SHDN
9 NC
FE PACKAGE
16-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 25°C/W, θJC = 8°C/W
EXPOSED PAD (PIN 17) IS IN, MUST BE SOLDERED TO PCB
TAB
IS IN
FRONT VIEW
7
6
5
4
3
2
1
T7 PACKAGE
7-LEAD PLASTIC TO-220
TJMAX = 150°C, θJA = 34°C/W, θJC = 3°C/W
OUT
GND
SET
IN
SHDN
IMONN
ILIM
3091fa
2
For more information www.linear.com/LT3091


Part Number LT3091IFE
Description 1.5A Negative Linear Regulator
Maker Linear
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