LT1020_03 Datasheet, PDF (6/16 Pages) Linear Technology – Micropower Regulator and Comparator

LT1020
TYPICAL PERFOR A CE CHARACTERISTICS
Regulator Thermal Regulation
0.1
V_IN = 15V
V_OUT = 5V
0
–0.1
50
0
0 20 40 60 80 100 120 140 160 180
TIME (ms)
1020 G16
LT1020 Turn-On Characteristic
5.5 _{VOUT = 5V}
5.0
4.5
4.0
NO LOAD R_L = 50Ω
3.5
3.0
R_L = 500Ω
2.5
2.0
0
01
2345 6
INPUT VOLTAGE (V)
78
1020 G17
PI FU CTIO S
Pins 1, 14: No Internal Connection.
Pin 2: Regulator Output. Main output, requires 10µF
output capacitor. Can be shorted to V_IN or ground without
damaging the device.
Pin 3: Input Supply. Bypass with 10µF capacitor. Must
always be more positive than ground.
Pin 4: Reference. 2.5V can source or sink current. May be
shorted to ground or up to 5V. Voltages in excess of 5V can
damage the device.
Pin 5: Comparator PNP Output. Open Collector PNP
Output. Pull-up current source for the comparator. May be
connected to any voltage from V_IN to 36V more negative
than V_IN (operates below ground). Short-circuit protected.
For example, if V_IN is 6V then pin 5 will operate to – 30V.
Pin 6: Comparator NPN Output. Open Collector NPN
Output. May be connected to any voltage from ground to
36V more positive than ground (operates above V_IN).
Short-circuit protected.
Pins 7, 8: Comparator Inputs. Operates from ground to
V_IN – 1V. Comparator inputs will withstand 36V even with
V_IN of 0V.
Pin 9: Ground.
Pin 10: Current Limit. Connecting this pin to ground
decreases the regulator current limit to 3mA minimum.
Leave open when not used.
Pin 11: Feedback. This is the feedback point of the regu-
lator. When operating, it is nominally at 2.5V. Optimum
source resistance is 200k to 500k. The feedback pin
should not be driven below ground or more positive than
5V.
Pin 12: Shutdown. Turns output off.
Pin 13: Dropout Detector. This pin acts like a current
source from V_IN which turns on when the output transistor
goes into saturation. The magnitude of the current de-
pends on the magnitude of the output current and the
input/output voltage differential. Pin current ranges from
5µA to about 300µA.
6
sn1020 1020fcs