LT1020_03 Datasheet, PDF (11/16 Pages) Linear Technology – Micropower Regulator and Comparator

TYPICAL APPLICATIO S
Battery Backup Regulator
BATTERY
INPUT
3
V_IN
LT1020
GND
9
2
V_OUT
11
FB
INTERNAL PARASITIC
DIODES OF LT1020
V_IN
V_OUT
0.001µF
V_OUT
5V
+
1M
2
V_OUT
10µF
LT1020
3
V_IN
11
FB
GND
50k
9
1020 TA13
MAIN
POWER
INPUT
1M
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
*TRANSISTOR USED BECAUSE OF LOW LEAKAGE
CHARACTERISTICS. TO TURN OFF THE OUTPUT
OF THE LT1020, FORCE FB (PIN 11) > 2.5V
+
1M
5V
10µF
NC
500k ^2N3904*
1020 TA14
1M
LOGIC INPUT
Turn-Off at Dropout
R1
R2
1.5M
1M
V_IN
8
3
2
V_OUT
V_OUT*
LT1020
0.001µF 1M
9
5
6
1M
DROP-
11
FB
OUT REF
1M
7 13 4
1.5M
0.047µF
*V_OUT TURNS OFF AT DROPOUT.
V_OUT TURN ON WHEN:
V_IN × R2 _{= 2.5V}
R1 + R2
10µF
1020 TA15
Current Limited 1 Amp Regulator
2.2k
0.5Ω*
V_IN
3
V_IN
LT1020
GND
9
V_{OUT 2}
11
FB
0.22µF
270Ω
MJE2955
100k
2N3906*
V_OUT
5V, 1A
220µF^†
1020 TA16
100k
*SETS CURRENT LIMIT BUT INCREASES
DROPOUT VOLTAGE BY 0.5V
†_{MUST HAVE LOW ESR. SEVERAL 100µF}
CAPACITORS CAN BE PARALLELED
LT1020
sn1020 1020fcs
11