Datasheet

23
LTC1421/LTC1421-2.5
APPLICATIONS INFORMATION
WUU
U
G Package
24-Lead Plastic SSOP (0.209)
(LTC DWG # 05-08-1640)
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTION
U
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
0.037 – 0.045
(0.940 – 1.143)
0.004 – 0.012
(0.102 – 0.305)
0.093 – 0.104
(2.362 – 2.642)
0.050
(1.270)
BSC
0.014 – 0.019
(0.356 – 0.482)
TYP
0
° – 8° TYP
NOTE 1
0.009 – 0.013
(0.229 – 0.330)
0.016 – 0.050
(0.406 – 1.270)
0.291 – 0.299**
(7.391 – 7.595)
× 45°
0.010 – 0.029
(0.254 – 0.737)
NOTE:
1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS
DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
*
**
S24 (WIDE) 1098
NOTE 1
0.598 – 0.614*
(15.190 – 15.600)
22 21 20 19 18
17
16 15
1
23
4
5
6
78
0.394 – 0.419
(10.007 – 10.643)
910
1314
11 12
2324
G24 SSOP 1098
0.13 – 0.22
(0.005 – 0.009)
0
° – 8°
0.55 – 0.95
(0.022 – 0.037)
5.20 – 5.38**
(0.205 – 0.212)
7.65 – 7.90
(0.301 – 0.311)
1234
5
6
7
8 9 10 11 12
8.07 – 8.33*
(0.318 – 0.328)
2122 18 17 16 15 14
13
19202324
1.73 – 1.99
(0.068 – 0.078)
0.05 – 0.21
(0.002 – 0.008)
0.65
(0.0256)
BSC
0.25 – 0.38
(0.010 – 0.015)
NOTE: DIMENSIONS ARE IN MILLIMETERS
DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.152mm (0.006") PER SIDE
DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.254mm (0.010") PER SIDE
*
**
SW Package
24-Lead Plastic Small Outline (Wide 0.300)
(LTC DWG # 05-08-1620)
Figure 26. Power-Up and Power-Down Sequence Controller
10
11
6
7
8
14
13
15
9
1
24
4
5
3
2
12
LTC1421
16
C2
0.1µF
24V
C1
1µF
16V
0.047µF
17181920212223
STAGGERED CONNECTOR
+
C5
0.1µF
25V
1k
R1
0.005Ω
1W
R3
1M
5%,1/8W
Q1
MTB50N06E
Q2
MTB50N06E
S1
1421 F26
PC BOARDBACKPLANE
5V
3.3V
R6
200k
1%
1/16W
R5
330k
1%
1/16W
3.3V
8A
5V
8A
R2
0.005Ω
1W
C
LOAD
C
LOAD
+
RESET
GND
µP
V
CC
R4
1k
5%
1/16W
1µF
43
21
43
21
10k