Datasheet LT3089 (Analog Devices)

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