LT4363 datasheet(19/22 Pages) AD

19 / 22 page

LTC4249

Rev. 0

For more information www.analog.com

During initial turn-on, the load capacitance charges

through ECB1 and the body diode of ECB2. RDY1 enables

ECB2 after the ECB1 10ms current limited turn phase

is complete. ECB2 then turns on and shunts the body

diode path.

Special “5V ONLY” Application

Under most circumstances, the minimum IN1 voltage

required for operation is 6V. However, a very narrow

application for IN1 = 5V is possible provided a few condi-

tions are met. First, the IN1 supply voltage must be tightly

regulated to ±5% (4.75V to 5.25V). Second, IN1 must be

connected to the INTVCC output (Figure 21). OUT1, when

ECB1 is on, is therefore constrained to the IN1 limitation.

IN2 may be operated normally over its full range.

This application is tested in production and has been

qualified over temperature. Note that while the electrical

table does not extend IN1 below 6V, this application is

supported with respect to all other electrical table entries

except for VCCOR, VECB2, VACC2 and tOC2. Above 1.8A,

the secondary overcurrent comparators may experience

increased threshold or delay. The primary overcurrent

comparators however, conform to data sheet specifica-

tions over their full range (1.2A), ensuring ECB shutoff

under overcurrent conditions.

Operation beyond these special constraints is not recom-

mended and operation is not guaranteed.

10k

TO LOAD1

5V ±5%

RIMON1

22F

GND

IN1

OUT1

EN1

RDY1

LTC4249

IMON1

IMON2

RDY2

IN2

EN2

OUT2

INTVCC

0.1F

TO LOAD2

22F

RIMON2

READY1

READY2

4249 F21

Figure 21. Special “5V ONLY” Application

APPLICATIONS INFORMATION

LT4363 Datasheet(PDF) 19 Page - Analog Devices

LT4363 Datasheet(HTML) 19 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Datasheet Download

Link URL