LTC1144 Datasheet, PDF (8/8 Pages) Linear Technology – Switched-Capacitor Wide Input Range Voltage Converter with Shutdown

LTC1144
TYPICAL APPLICATI S
Regulated –5V Output Voltage
Figure 12 shows a regulated –5V output with a 9V input.
With a 0mA to 5mA load current, the R_OUT is below 20Ω.
Paralleling for Lower Output Resistance
Additional flexibility of the LTC1144 is shown in Figure 13.
Two LTC1144s are connected in parallel to provide a lower
effective output resistance. However, if the output resis-
tance is dominated by 1/(f × C1), increasing the capacitor
size (C1) or increasing the frequency will be of more
benefit than the paralleling circuit shown.
C1 ⁺
10µF
1
8
2
7
3 ^LTC1144
6
C1 ⁺
4
5 ^10µF
+
1µF
9V
1
8
2
7
3 ^LTC1144 6
4
5
2N2369
36k
300k
– 5V
100µF
1144 F12
Figure 12. A Regulated – 5V Supply
V⁺
1
8
2
7
3 ^LTC1144 6
4
5
1/4 CD4077*
V_OUT = –(V⁺)
+
C2
20µF
* THE EXCLUSIVE NOR GATE
SYNCHRONIZES BOTH LTC1144s
TO MINIMIZE RIPPLE
1144 F13
Figure 13. Paralleling for Lower Output Resistance
PACKAGE DESCRIPTION Dimemsions in inches (millimeters) unless otherwise noted.
N8 Package
8-Lead Plastic DIP
0.300 – 0.320
(7.620 – 8.128)
0.009 – 0.015
(0.229 – 0.381)
+0.025
0.325 _–0.015
( ) ^8.255
+0.635
–0.381
0.045 – 0.065
(1.143 – 1.651)
0.065
(1.651)
TYP
0.045 ± 0.015
(1.143 ± 0.381)
0.100 ± 0.010
(2.540 ± 0.254)
S8 Package
8-Lead Plastic SOIC
0.010
(0.254
–
–
0.020
0.508)
×
45°
0.008 – 0.010
(0.203 – 0.254)
0.016 – 0.050
0.406 – 1.270
0.053 – 0.069
(1.346 – 1.752)
0°– 8° TYP
0.014 – 0.019
(0.355 – 0.483)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
[phone] ^q FAX: [phone] ^q TELEX: 499-3977
0.130 ± 0.005
(3.302 ± 0.127)
0.125
(3.175)
MIN
0.020
(0.508)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
0.004 – 0.010
(0.101 – 0.254)
0.400
(10.160)
MAX
8
7
6
5
0.250 ± 0.010
(6.350 ± 0.254)
12
34
0.189 – 0.197
(4.801 – 5.004)
8
7
6
5
0.050
(1.270)
BSC
0.228 – 0.244
(5.791 – 6.197)
0.150 – 0.157
(3.810 – 3.988)
1
2
34
LT/GP 0494 10K • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1994