34
LTC4230
4230f
Figure 25. Low Side Overvoltage Protection Timing
1 3 7654
4230 F24
CHECK FOR FILTER LOW (< V
REF
)
CHECK FOR FAULT HIGH (> V
REF
+ 50mV)
8
FAST COMPARATOR
ARMED
9
FILTER < 1.19V
FILTER < 1.26V
1.234V
ON
TIMER
RESET
n
GATE
n
V
OUT
n
FILTER
FAULT
CHECK FOR
TIMER < 0.3V
2
CHECK FOR
GATE
n
< 0.25V
APPLICATIO S I FOR ATIO
WUU
U
35
LTC4230
4230f
Figure 26. Recommended Layout for LTC4230 R
SENSE
, Power MOSFET and Feedback Network
4230 F26
NOTE: DRAWING IS NOT TO SCALE!
USE SIMILAR TECHNIQUES FOR V
CC1
AND V
CC2
**ADDITIONAL DETAILS OMITTED FOR CLARITY
*OPTIONAL COMPONENTS
C
TIMER
C
GX
*
VIA TO
GNDPLANE
R
GX
*
12k
5.1k
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
GND
TIMER
LTC4230**
FB3
RESET 3
GATE 3
SENSE 3
V
CC3
D
D
D
D
G
S
S
S
POWER MOSFET
SO-8
SENSE RESISTOR
(R
SENSE
)
CURRENT FLOW
TO LOAD
TRACK WIDTH W
W
W
CURRENT FLOW
TO LOAD
CURRENT FLOW
TO LOAD
W
APPLICATIO S I FOR ATIO
WUU
U
APPE DIX
U
Table 4 lists some current sense resistors that can be used
with the circuit breaker. Table 5 lists some power MOSFETs
that are available. Table 6 lists the web sites of several
manufacturers. Since this information is subject to change,
please verify the part numbers with the manufacturer.
Table 4. Sense Resistor Selection Guide
CURRENT LIMIT VALUE PART NUMBER DESCRIPTION MANUFACTURER
1A LR120601R050 0.05 0.5W 1% Resistor IRC-TT
2A LR120601R025 0.025 0.5W 1% Resistor IRC-TT
2.5A LR120601R020 0.02 0.5W 1% Resistor IRC-TT
3.3A WSL2512R015F 0.015 1W 1% Resistor Vishay-Dale
5A LR251201R010F 0.01 1.5W 1% Resistor IRC-TT
10A WSR2R005F 0.005 2W 1% Resistor Vishay-Dale
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.
36
LTC4230
4230f
LT/TP 0702 2K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 2001
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
FAX: (408) 434-0507
www.linear.com
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LTC1421 2-Channel Hot Swap Controller 24-Pin, Operates from 3V to 12V and Supports –12V
LTC1422 Single Channel Hot Swap Controller in SO-8 Operates from 2.7V to 12V
LT1641-1/LT1641-2 Positive Voltage Hot Swap Controller Operates from 9V to 80V
LTC1642 Single Channel Hot Swap Controller 16-Pin, Overvoltage Protection to 33V
LTC1644 PCI Hot Swap Controller 3.3V, 5V and ±12V, 1V Precharge, PCI Reset Logic
LTC1647 Dual Channel Hot Swap Controller 8-Pin, 16-Pin, Operates from 2.7V to 16.5V
LTC4211 Single Hot Swap Controller with Multifunction Current Control 2.5V to 16.5V, Similar Features as LTC4230
LT4250L/LT4250H Negative Voltage Hot Swap Controllers in SO-8 Operates from –20V to –80V, Active Current Limiting
LTC4251 48V Hot Swap Controller in SOT-23 15V to –100V, Active Current Limiting
U
PACKAGE DESCRIPTIO
GN Package
20-Lead Plastic SSOP (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1641)
Table 5. N-Channel MOSFET Selection Guide
CURRENT LEVEL (A) PART NUMBER DESCRIPTION MANUFACTURER
0 to 2 MMDF3N02HD Dual N-Channel SO-8, R
DS(ON)
= 0.09, C
ISS
= 455pF ON Semiconductor
2 to 5 MMSF5N02HD Single N-Channel SO-8, R
DS(ON)
= 0.025, C
ISS
= 1130pF ON Semiconductor
5 to 10 MTB50N06V Single N-Channel DD Pak, R
DS(ON)
= 0.028, C
ISS
= 1570pF ON Semiconductor
10 to 20 MTB75N05HD Single N-Channel DD Pak, R
DS(ON)
= 0.0095, C
ISS
= 2600pF ON Semiconductor
Table 6. Manufacturers’ Web Sites
MANUFACTURER WEB SITE MANUFACTURER WEB SITE
TEMIC Semiconductor www.temic.com IRC-TT www.irctt.com
International Rectifier www.irf.com Vishay-Dale www.vishay.com
ON Semiconductor www.onsemi.com Vishay-Siliconix www.vishay.com
Intersil www.intersil.com Diodes, Inc. www.diodes.com
APPE DIX
U
0.337 – 0.344*
(8.560 – 8.737)
GN20 (SSOP) 1098
* 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
12
3
4
5
6
7
8910
0.229 – 0.244
(5.817 – 6.198)
0.150 – 0.157**
(3.810 – 3.988)
1617181920
15
14
13
12 11
0.016 – 0.050
(0.406 – 1.270)
0.015
± 0.004
(0.38 ± 0.10)
× 45°
0° – 8° TYP
0.007 – 0.0098
(0.178 – 0.249)
0.053 – 0.068
(1.351 – 1.727)
0.008 – 0.012
(0.203 – 0.305)
0.004 – 0.0098
(0.102 – 0.249)
0.0250
(0.635)
BSC
0.058
(1.473)
REF

LTC4230CGN

Mfr. #:
Manufacturer:
Analog Devices / Linear Technology
Description:
Hot Swap Voltage Controllers LTC4230 - Triple Hot Swap Controller with Multifunction Current Control
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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