Datasheet LT3086 (Analog Devices)

LT3086 40V, 2.1A Low Dropout Adjustable Linear Regulator with Monitoring and Cable Drop Compensation
FeaTures DescripTion
n
Wide Input Voltage Range: 1.4V to 40V
The LT®3086 is a multi-feature, low dropout, low noise n
1 Resistor Sets Output Voltage: 0.4V to 32V
2.1A linear regulator that operates over a 1.4V to 40V n
Output Current: 2.1A
input supply range. Dropout voltage at 2.1A is typically n
±2% Tolerance Over Line, Load and Temperature
330mV. One resistor sets output voltage from 0.4V to 32V. n
Output Current Monitor: IMON = IOUT/1000
Output voltage tolerance is guaranteed to ±2% over line, n
Temperature Monitor with Programmable
load and temperature. The LT3086 is stable with ceramic
Thermal Limit
output capacitors, requiring a minimum of 10µF. n
Programmable Cable Drop Compensation
The LT3086’s programmable cable drop compensation n
Parallel Multiple Devices for Higher Current
cancels output voltage errors caused by resistive connec- n
Dropout Voltage: 330mV
tions to the load. A master/slave configuration allows paral- n 1 Capacitor Soft-Starts Output and Decreases Noise leling of multiple devices for higher load current and heat n Low Output Noise: 40µVRMS (10Hz to 100kHz) spreading without external ballast resistor requirements. n Precision, Programmable External Current Limit n Power Good Flag with Programmable Threshold Output current and temperature monitoring along with n Ceramic Output Capacitors: 10µF Minimum a power good flag provide system diagnostic and debug n Quiescent Current in Shutdown: <1µA capability. Internal fault circuitry includes thermal shutdown n Reverse-Battery, -Current and -Output Protection and current limit with foldback. Thermal limit and current n Available in 5mm × 4mm 16-Lead DFN, limit are also externally programmable. 16-Lead TSSOP, 7-Lead DD-Pak and 7-Lead TO-220. Packages include the thermal y enhanced 16-lead (5mm × 4mm) DFN, 16-lead TSSOP, 7-lead DD-Pak and
applicaTions
7-lead TO-220. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear n Programmable Linear Regulator Technology Corporation. All other trademarks are the property of their respective owners. n Post Regulator for Switching Supplies n USB Power Supplies n High Reliability Power Supplies
Typical applicaTion Transient Response with Cable 5V, 2.1A USB Supply with Cable Drop Compensation Drop Compensation (CDC)
CABLE 5.8 V V IN = 6V OUT RLINE1 5.6 R IN OUT MON = 357Ω R V 5.4 WIRE = 0.24Ω IN 10µF LT3086 RSET 82.5k 10µF R 6V TO 90.9k + 1.1k CDC = 46.4k 1% 5.2 VOUT WITH CDC 15V SHDN SET 1% TAGE (V) 5.0 VTEMP TEMP RCDC V 10mV/°C 1% 100k V 4.8 LOAD WITH CDC LOAD 25°C = 250mV TRACK CDC LOAD 5V AT 2.1A 4.6 RCDC 1% VLOAD WITHOUT CDC I OUTPUT VOL TO ADC MON RPWRGD 4.4 0.8V AT 2.24A ILIM PWRGD VPWRGD 4.2 FULL-SCALE RMON GND 357Ω R ∆I LINE2 2 LOAD = 0.5A TO 1.5A 1% 3086 TA01 1 LOAD RMON •RSET *SEE APPLICATIONS INFORMATION R 0 CDC = FOR INDUCTANCE EFFECTS ASSOCIATED 3000 •R CURRENT (A) WIRE 0 80 160 240 320 400 480 560 640 720 800 WITH RWIRE TIME (µs) RWIRE =RLINE1+RLINE2* 3060 TA04b 3086fb For more information www.linear.com/LT3086 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Typical Application Related Parts