LTC4253 LINER [Linear Technology], LTC4253 Datasheet - Page 32

• Manufacturer Part Number: LTC4253
• Manufacturer: LINER [Linear Technology]

LTC4253/LTC4253A
APPLICATIONS INFORMATION
The peak power at the fault current limit occurs at the supply
overvoltage threshold. The fault current limited power is:
PACKAGE DESCRIPTION
Please refer to
32
POWER(FAULT) =
(
V
SUPPLY
R
S
)
http://www.linear.com/designtools/packaging/
(0.178 – 0.249)
.007 – .0098
• V
⎡
⎢
⎣
NOTE:
1. CONTROLLING DIMENSION: INCHES
2. DIMENSIONS ARE IN
3. DRAWING NOT TO SCALE
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
* DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
ACL
.254 MIN
.0165 ±.0015
RECOMMENDED SOLDER PAD LAYOUT
− (V
SUPPLY
(0.406 – 1.270)
.016 – .050
(MILLIMETERS)
INCHES
− V
Z
) •
16-Lead Plastic SSOP (Narrow .150 Inch)
.150 – .165
.045 ±.005
R4
R3
0° – 8° TYP
(0.38 ±0.10)
.015 ±.004
(Reference LTC DWG # 05-08-1641)
.0250 BSC
⎤
⎥
⎦
(18)
GN Package
for the most recent package drawings.
45
(5.817 – 6.198)
(0.203 – 0.305)
Circuit Breaker with Foldback Current Limit
Figure 17 shows the LTC4253A in a foldback current limit
application. When V
current flows through resistors R3 and R4. This results in
a voltage drop across R4 and a corresponding reduction
in voltage drop across the sense resistor, R
amplifier servos the sense voltage between the SENSE and
V
RS reduces as the V
short-circuit condition. Without foldback current limiting
resistor R4, the current is limited to 3A during analog
current limit. With R4, the short-circuit current is limited
to 0.5A when V
.229 – .244
.008 – .012
EE
TYP
pins to about 60mV. The short-circuit current through
.0532 – .0688
(1.35 – 1.75)
16 15 14 13
1
OUT
2 3
(4.801 – 4.978)
.189 – .196*
OUT
OUT
is shorted to 71V.
4
12 11 10 9
5 6 7
voltage increases during an output
is shorted to the –48V RTN supply,
(0.635)
.0250
BSC
(0.102 – 0.249)
8
.004 – .0098
(3.810 – 3.988)
.150 – .157**
GN16 (SSOP) 0204
(0.229)
.009
REF
S
, as the ACL
425353afe