 English |
|
|
|
|
|
|
|
| LT1020 Datasheet, PDF (14/16 Pages) Linear Technology – Micropower Regulator and Comparator | |||
| |||
| ◁ |
LT1020
TYPICAL APPLICATI
S
50mA Battery Charger and Regulator
+
+
10µF
10µF 51k
VIN*
2N2905
6
* VIN MUST BE GREATER THAN THE
BATTERY VOLTAGE PLUS 1.3V
20k
220k
8
43
VIN
2
VOUT
LT1020
7
2.5V
1M
11
FB
1M
9
0.001µF
10µF
5V
10µF
6V
BATTERY
3.9â¦
1020 TA21
Switching Preregulator for Wide Input Voltage Range
7.5V TO 30V
VIN
100µF
3.3M
TO
VREF
(PIN4)
1.8M
2N3904
2N3904
1M
1k
30k
2N3906
10k
100k
LT1020
COMPARATOR
6
MAINTAINS LOW IQ (< 100µA)
FOR ALL INPUT VOLTAGES
SWITCHER EFFICIENCY = 85%
POST REGULATOR EFFICIENCY = 82%
2M
OVERALL EFFICIENCY = 70%
SWITCHING REGULATOR OUTPUT =
2.5 Ã (1 + RA/RB). FOR A CLEAN OUTPUT
FROM THE LINEAR REGULATOR SET TO VOUT + 1.2V
2N2222
SWITCHING
REGULATOR
OUTPUT
4mH
2M
8
30k
POST REGULATOR
3 VIN
LT1020 VOUT 2
VREF
FB
4
11
VOUT
5V
100mA
22µF
RA
7
1.5M
RB
1M
0.001µF
30k
100µF
0.01µF 220k
220k
1020 TA22
14
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese