Datasheet LT3081 (Analog Devices)

LT3081 1.5A Single Resistor Rugged Linear Regulator with Monitors
FeaTures DescripTion
n
Extended Safe Operating Area
The LT®3081 is a 1.5A low dropout linear regulator de- n
Maximum Output Current: 1.5A
signed 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 LT3081 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 LT3081’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 makes load regulation independent of output n
Programmable Current Limit
voltage. The LT3081 is stable with or without input and n
Reverse-Battery and Reverse-Current Protection
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 × 4mm temperature output (1µA/°C) provide system monitoring DFN and 16-Lead TSSOP, 7-Lead DD-Pak and 7-Lead and debug capability. In addition, a single resistor pro- TO-220 grams current limit. Internal protection circuitry includes reverse-battery and
applicaTions
reverse-current protection, current limiting and thermal n All Surface Mount Power Supply limiting. The LT3081 is offered in the 16-lead TSSOP (with n Rugged Industrial Power Supply exposed pad for improved thermal performance), 7-lead n Post Regulator for Switching Supplies TO-220, 7-lead DD-Pak, and an 12-lead 4mm × 4mm DFN. n Low Output Voltage Supply L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear n Intrinsic Safety Applications Technology Corporation. All other trademarks are the property of their respective owners.
Typical applicaTion SET Pin Current Wide Safe Operating Area Supply
50.5 IL = 5mA 50.4 VIN 50.3 LT3081 IN 50.2 50.1 ILOAD/5000 1µA/°C 50µA 50.0 + 49.9 – IOUT 49.8 OUT 1.5V SET PIN CURRENT (µA) 1A 49.7 IMON TEMP SET ILIM 10µF* 300Ω* 49.6 1k 1k 30.1k 4.53k 3081 TA01a 49.5 *OPTIONAL –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) 3081 TA01b 3081fc For more information www.linear.com/LT3081 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