LT1020 Datasheet, PDF (11/16 Pages) Linear Technology – Micropower Regulator and Comparator

LT1020
TYPICAL APPLICATI S
Battery Backup Regulator
BATTERY
INPUT
3
V_IN
LT1020
GND
9
2
V_OUT
11
FB
0.001µF
V_OUT
5V
2
V_OUT
1M
10µF
LT1020
11
FB
GND
50k
9
3
V_IN
MAIN
POWER
INPUT
INTERNAL PARASITIC
DIODES OF LT1020
1M
V_IN
V_OUT
1020 TA13
5V Regulator with Shutdown
V_IN > 5.2V
I_Q = 40µA
3
V_IN
LT1020
2
V_OUT
GND FB
9
11 100k
0.001µF
5V
10µF
NC
1M
500k ^2N3904*
* TRANSISTOR USED BECAUSE OF LOW LEAKAGE
1M
CHARACTERISTICS. TO TURN OFF THE OUTPUT
OF THE LT1020, FORCE FB (PIN 11) > 2.5V.
LOGIC INPUT
1020 TA14
Turn-Off at Dropout
V_IN
3
R1
1.5M
9
5
6
1M
* V_OUT TURNS OFF AT DROPOUT.
V_OUT TURN ON WHEN:
V_IN × R2 _{= 2.5V}
R1 + R2
R2
1M
8
2
V_OUT
LT1020
DROP-
OUT
7 13
11
FB
REF
4
1.5M
0.047µF
0.001µF 1M
1M
V_OUT*
10µF
1020 TA15
11