LTC4253 datasheet(32/34 Pages) LINER

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LTC4253/LTC4253A

425353afe

GN Package

16-Lead Plastic SSOP (Narrow .150 Inch)

(Reference LTC DWG # 05-08-1641)

APPLICATIONS INFORMATION

The peak power at the fault current limit occurs at the supply

overvoltage threshold. The fault current limited power is:

POWER(FAULT)

SUPPLY

()

•V

ACL − (VSUPPLY − VZ )•

⎡

⎣⎢

⎤

⎦⎥

(18)

Circuit Breaker with Foldback Current Limit

Figure 17 shows the LTC4253A in a foldback current limit

application. When VOUT is shorted to the –48V RTN supply,

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, RS, as the ACL

amplifier servos the sense voltage between the SENSE and

VEE pins to about 60mV. The short-circuit current through

RS reduces as the VOUT voltage increases during an output

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 VOUT is shorted to 71V.

PACKAGE DESCRIPTION

Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.

GN16 (SSOP) 0204

.229 – .244

(5.817 – 6.198)

.150 – .157**

(3.810 – 3.988)

16 15 14 13

.189 – .196*

(4.801 – 4.978)

12 11 10 9

.016 – .050

(0.406 – 1.270)

.015 ±.004

(0.38 ±0.10)

0° – 8° TYP

.007 – .0098

(0.178 – 0.249)

.0532 – .0688

(1.35 – 1.75)

.008 – .012

(0.203 – 0.305)

TYP

.004 – .0098

(0.102 – 0.249)

.0250

(0.635)

BSC

.009

(0.229)

REF

.254 MIN

RECOMMENDED SOLDER PAD LAYOUT

.150 – .165

.0250 BSC

.0165 ±.0015

.045 ±.005

*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

INCHES

(MILLIMETERS)

NOTE:

1. CONTROLLING DIMENSION: INCHES

2. DIMENSIONS ARE IN

3. DRAWING NOT TO SCALE

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