Datasheet LT1120A (Analog Devices) - 6

LT1120A
Typical perForMance characTerisTics Feedback Pin Current Regulator Thermal Regulation Turn-On Characteristics
40 0.1 5.5 VIN = 15V VOUT = 5V 35 VOUT = 5V 5.0 0 NO LOAD 30 TJ = –55°C 4.5 25 –0.1 4.0 RL = 500Ω 20 3.5 OUTPUT VOLTAGE CHANGE (%) 15 TJ = 25°C 3.0 10 50 OUTPUT VOLTAGE (V) 2.5 FEEDBACK PIN CURRENT (nA) 5 TJ = 125°C 2.0 RL = 50Ω 0 0 0 0.1 1 10 100 1000 0 20 40 60 80 100 120 140 160 180 0 1 2 3 4 5 6 7 8 REGULATOR OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) TIME (ms) INPUT VOLTAGE (V) 1120A G10 1120A G11 1120A G12
pin FuncTions GND (Pin 1):
Ground
VIN (Pin 5):
Input Supply. Bypass with 10µF capacitor.
FEEDBACK (Pin 2):
This is the feedback point of the Must always be more positive than ground. regulator. When operating, it is nominally at 2.5V.
REF (Pin 6):
Reference. 2.5V can source or sink current. Optimum source resistance is 200k to 500k. The feedback May be shorted to ground or up to 5V. Voltages in excess pin should not be driven below ground or more positive of 5V can damage the device. than 5V.
COMP OUT (Pin 7):
Open Collector NPN Output. May
SHUTDOWN (Pin 3):
A logic 1 shuts off main regulator. be connected to any voltage from ground to 36V more Caution: noise or leakage into the shutdown pin can affect positive than ground (operates above VIN). Short-circuit output voltage. protected.
VOUT (Pin 4):
Main output, requires 10µF output capacitor.
–INPUT (Pin 8):
Inverting Comparator Input. Can be shorted to VIN or ground without damaging device. 1120afb 6 For more information www.linear.com/LT1120A Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Related Parts