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LT1020CSW Scheda tecnica(PDF) 13 Page - Linear Technology

Il numero della parte LT1020CSW
Spiegazioni elettronici  Micropower Regulator and Comparator
PDF  16 Pages
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Produttore elettronici  LINER [Linear Technology]
Homepage  http://www.linear.com
Logo LINER - Linear Technology

LT1020CSW Scheda tecnica(HTML) 13 Page - Linear Technology

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13
LT1020
sn1020 1020fcs
TYPICAL APPLICATIO S
50mA Battery Charger and Regulator
1020 TA21
6
1M
51k
VOUT
0.001
µF
+
4
7
8
9
1M
10
µF
2
11
FB
5V
VIN*
3
–
+
LT1020
2.5V
20k
VIN
220k
+
10
µF
+
10
µF
6V
BATTERY
2N2905
*VIN MUST BE GREATER THAN THE
BATTERY VOLTAGE PLUS 1.3V
3.9
Ω
10
µF
+
Charge Pump Voltage Doubler
–
+
1020 TA20
5
6
7
8
9
22k
51k
VIN
3
VOUT
1M
2N3904
10
µF
VOUT (NL) ≅ 2VIN – 1V
VOUT (5mA) ≅ 2VIN – 3V
IQ ≅ 300µA
0.0033
µF
51k
1M
20
µF
1N5819
OR EQUIVALENT
+
Switching Preregulator for Wide Input Voltage Range
–
+
+
22
µF
0.01
µF
POST REGULATOR
2
11
3
4
VIN
VOUT
FB
VOUT
5V
100mA
LT1020
1020 TA22
MAINTAINS LOW IQ (< 100µA)
FOR ALL INPUT VOLTAGES
SWITCHER EFFICIENCY = 85%
POST REGULATOR EFFICIENCY = 82%
OVERALL EFFICIENCY = 70%
SWITCHING REGULATOR OUTPUT =
2.5
× (1 + RA/RB). FOR A CLEAN OUTPUT
FROM THE LINEAR REGULATOR SET TO VOUT + 1.2V
VREF
220k
+
100
µF
LT1020
COMPARATOR
VIN
7.5V TO 30V
TO
VREF
(PIN4)
100
µF
1.8M
1M
3.3M
30k
1k
2N3906
100k
10k
2M
RB
1M
2M
30k
RA
1.5M
0.001
µF
SWITCHING
REGULATOR
OUTPUT
4mH
30k
220k
8
7
2N3904
2N3904
2N2222
6



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