12
LTC1541/LTC1542
15412fd
© LINEAR TECHNOLOGY CORPORATION 2005
LT 1105 REV D • PRINTED IN USA
PART NUMBER DESCRIPTION COMMENTS
LT
®
1078/LT1079 Dual/Quad Micropower, Single Supply Precision Op Amps 70µV, V
OS
Max and 0.4µV/°C Drift, 200kHz GBW, 0.07V/µs
Slew Rate, Input/Output Common Mode Includes Ground
LT1178/LT1179 Dual/Quad 17µA Max, Single Supply Precision Op Amps 70µV, V
OS
Max and 2.5µV/°C Drift Max, 85kHz GBW, 0.04V/µs
Slew Rate, Input/Output Common Mode Includes Ground
LT1490/LT1491 Dual/Quad Micropower Rail-to-Rail Input and Output Op Amps Single Supply Input Range: – 0.4V to 44V, Micropower 50µA
Amplifier, Rail-to-Rail Input and Output, 200kHz GBW
LT1635 Micropower Rail-to-Rail Op Amp and Reference 130µA of Supply Current, 1.3mV V
OS
Max
LT2078/LT2079 Dual/Quad Micropower, Single Supply Precision Op Amps SO-8 and 14-Lead Standard Pinout, 70µV V
OS
Max, 200kHz GBW
LT2178/LT2179 Dual/Quad 17µA Max, Single Supply Precision Op Amps SO-8 and 14-Lead Standard Pinout, 70µV V
OS
Max, 85kHz GBW
RELATED PARTS
TYPICAL APPLICATIO S
U
R1
220Ω
0.25W
V
CC
+
–
+
–
2
1
3
6
7
8
5
4
R1
1M
Q2
2N3906
Q1
FZT2907A
V
IN
6V
300mA
SHUTDOWN
IC1
LTC1541
V
SS
1541/42 TA07
R4
100k
1%
R3
3.83k
1%
R7
0.15Ω
R5
2.2M
R8
249k
0.5%
300mA
4.2V FLOAT
Li-ION
C3
0.01µF
C1
4700pF
D1
1N5817
C2
0.1µF
R6
33k
R9
100k
0.5%
×1
Linear Lithium-Ion Charger
Voltage Control Oscillator
–
+
1
4
8
LTC1542
OP AMP
2
3
7
6
5
5V
0V
V
OUT
V
CC
V
IN
0V – V
CC
1541/42 TA03
–
+
R4
5M
1M
1M
R2
150k
R1
300k
R4
1.1M
VN2222
VN2222
C1
0.047µF
R3
500k
FREQ ≈
V
C
2.4C • R1 • V
CC
VALUES SHOWN ARE FOR
100Hz WITH V
IN
= V
CC
LTC1542
COMP
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
–
+
1
4
8
2
3
7
5
6
1541/42 TA04
–
+
LTC1542
OP AMP
LTC1542
COMP
5M
5M
0.1µF
R2
500k
R1
10M
R3
5M
FREQ ≈
R1
4C • R2 • R3
V
CC
3V TO 12V
Single Supply Function Generator
1541/42 TA05
+
–
LTC1542
OP AMP
V
SS
–3V
V
CC
3V TO 9V
V
OUT
–2.5V
1
4
8
2
3
200k
LT1634-2.5
Negative Reference