LT3089 Datasheet, PDF (1/28 Pages) Linear Integrated Systems – 800mA Single Resistor Rugged Linear Regulator with Monitors

FEATURES
n _{Extended Safe Operating Area}
n _{Maximum Output Current: 800mA}
n _{Stable with or without Input/Output Capacitors}
n _{Wide Input Voltage Range: 1.2V to 36V}
n _{Single Resistor Sets Output Voltage}
n _{Output Current Monitor: IMON = IOUT/5000}
n _{Junction Temperature Monitor: 1µA/°C}
n _{Output Adjustable to 0V}
n _{50µA SET Pin Current: 1% Initial Accuracy}
n _{Output Voltage Noise: 27µVRMS}
n _{Parallel Multiple Devices for Higher Current or}
Heat Spreading
n _{Programmable Current Limit}
n _{Reverse-Battery and Reverse-Current Protection}
n _{<1mV Load Regulation Typical Independent of VOUT}
n _{<0.001%/V Line Regulation Typical}
n _{Available in Thermally-Enhanced 12-Lead 4mm ×}
4mm DFN, 16-Lead TSSOP, and 7-Lead DD-Pak
APPLICATIONS
n _{All Surface Mount Power Supply}
n _{Rugged Industrial Power Supply}
n _{Post Regulator for Switching Supplies}
n _{Low Output Voltage Supply}
n _{Intrinsic Safety Applications}
LT3089
800mA Single Resistor
Rugged Linear Regulator
with Monitors
DESCRIPTION
The LT^®3089 is an 800mA low dropout linear regulator
designed for rugged industrial applications. Key features of
the IC are the extended safe operating area (SOA), output
current monitor, temperature monitor and programmable
current limit. The LT3089 can be paralleled for higher
output current or heat spreading. The device withstands
reverse input and reverse output-to-input voltages without
reverse current flow.
The LT3089’s precision 50µA reference current source
allows a single resistor to program output voltage to
any level between zero and 34.5V. The current reference
architecture enables load regulation to be independent of
output voltage. The LT3089 is stable with or without input
and output capacitors.
The output current monitor (I_OUT/5000) and die junction
temperature output (1µA/°C) provide system monitor-
ing and debug capability. In addition, a single resistor
programs current limit.
Internal protection circuitry includes reverse-battery and
reverse-current protection, current limiting and thermal lim-
iting. The LT3089 is offered in the 12-lead 4mm × 4mm DFN
and 16-lead TSSOP (both with exposed pad for improved
thermal performance), and 7-lead DD-Pak power package.
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.
TYPICAL APPLICATION
LT3089
Wide Safe Operating Area Supply
V_IN
IN
I_LOAD/5000
1µA/°C
50µA
+
–
I_MON
TEMP
SET
1k
1k
30.1k
OUT
I_LIM
4.12k
10µF*
I_OUT
1.5V
0.75A
499Ω*
*OPTIONAL
3089 TA01a
For more information www.linear.com/LT3089
SET Pin Current
50.5
50.4 ^{ILOAD = 3mA}
50.3
50.2
50.1
50.0
49.9
49.8
49.7
49.6
49.5
–75 –50 –25
0 25 50 75 100 125 150 175
TEMPERATURE (°C)
3089 TA01b
3089f
1