New 3-Terminal Regulators Add Functionality Comparison of Key Features and Specifications LT3083 LT3086 LT3081 LT3080 LT3085 LT3082 LM317 LT108x IOUT 3A 2.1A 1.5A 1.1A 0.5A 0.2A 1.5A 1.5A to 7.5A Maximum VIN 23V 40V 40V 36V 36V 40V 40V 30V Minimum VOUT 0V 400mV 0V 0V 0V 0V 1.25V 1.25V Dropout Voltage 310mV 330mV 1.25V 350mV 275mV 1.3V 2.2V 1.3V Minimum ILOAD 1mA 0µA 2mA 500µA 500µA 500µA 5mA 10mA Minimum COUT 10µF 10µF None 2.2µF 2.2µF 2.2µF 1µF Tantalum 10µF Tantalum Current Reference 50µA 50µA 50µA 10µA 10µA 10µA N N 1 Resistor VOUT Set Y Y Y Y Y Y N N Parallelable Y Y Y Y Y Y N N IOUT Monitor N Y Y N N N N N Temperature Monitor N Y Y N N N N N Programmable Current Limit N Y Y N N N N N Benefits of LT308X Regulators with a Current Source Reference over Traditional 3-Terminal Regulators with a Voltage Reference 1 Resistor Programs Output Voltage n Always Operates in Unity-Gain – Bandwidth Independent of Output Voltage – Transient Response Independent of Output Voltage n Output Voltage Programmable Down to 0V Output Noise Independent of Output Voltage PSRR Independent of Output Voltage Parallelable to Spread Heat across PCB n n n n Typical Performance Curves Programmable Current Limit SET Pin Current 50.5 50.4 IL = 5mA 50.2 OUTPUT VOLTAGE (V) SET PIN CURRENT (µA) 50.3 50.1 50.0 49.9 49.8 49.7 1.10 1.05 1.00 0.95 0.60 RILIM = 1.5k 0 25 50 75 100 125 150 TEMPERATURE (°C) RILIM = 4.53k 0.40 0.20 49.6 49.5 –50 –25 RILIM = 3.01k 0 RSET = 20k 0 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. 1.0 0.5 1.5 OUTPUT CURRENT (A) 2.0 Typical Circuit Configurations Wide Safe Operating Area Supply 5V, 2.1A USB with Cable Drop Compensation VIN LT3081 VIN 6V TO 40V ISET 50µA + – TEMP TEMP 2mV/°C ILIM SET IMON IMON 2k RSET 100k IOUT RLOAD 1.5A 1.5mA MIN COUT 10µF TO ADC 0.8V AT 2.24A FULL-SCALE TRACK RCDC 1% IMON ISET RMON 357Ω 1% CDC CABLE RLINE1 10µF 82.5k 1% 100k RPWRGD PWRGD GND VLOAD 5V AT 2.1A PWRGD RLINE2 Current Source LT3080 CONTROL RSET RILIM 6.04k 1k 200mV/A VIN RSET 93.1k 1% TEMP Low Dropout Regulator 2.5V 5V OUT LT3086 SHDN TEMP 10mV/°C 25°C = 250mV VOUT = 0 TO 5V OUT IN 10µF VOUT LOAD IN VIN 10V IN LT3081 50µA 10µA + – + – OUT SET 1.8V OUT SET 2.2µF 180k 0.1Ω IOUT 0A TO 1.5A 5k Paralleled Regulator IN LT3083 VCONTROL Paralleled Regulators Show Even Heat Spreading* 50µA + – OUT 10mΩ OUT 10mΩ SET VIN 4.8V TO 28V IN LT3083 VCONTROL 50µA + – 10µF SET VOUT 3.3V 6A 22µF 33.2k *NO HEAT SINKS AND NO AIR FLOW www.linear.com/LDO n 1-800-4-LINEAR 0213