MAX4838AEXT datasheet(3/11 Pages) MAXIM

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Overvoltage-Protection Controllers with

Status

FLAG

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VIN = +5V (MAX4838A/MAX4840A), VIN = +4V (MAX4842A), TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA

= +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

TIMING

Startup Delay

tSTART

VIN > VUVLO, VGATE > 0.3V, Figure 1

FLAG Blanking Time

tBLANK

VGATE > 0.3V, VFLAG > 2.4V, Figure 1

GATE Turn-On Time

tGON

VGATE = 0.3V to 8V (MAX4838A/MAX4840A),

VGATE = 0.3V to 6V (MAX4842A),

CGATE = 1500pF, Figure 1

GATE Turn-Off Time

tGOFF

VIN increasing from 5V to 8V at 3V/µs

(MAX4838A/MAX4840A), VIN increasing

from 4V to 6V at 3V/µs (MAX4842A),

VGATE = 0.3V, CGATE = 1500pF, Figure 2

620µs

FLAG Assertion Delay

tFLAG

VIN increasing from 5V to 8V at 3V/µs

(MAX4838A/MAX4840A), VIN increasing

from 4V to 6V at 3V/µs (MAX4842A),

VFLAG = 0.4V, Figure 2

5.8

µs

Initial Overvoltage Fault Delay

tOVP

VIN increasing from 0 to 8V

(MAX4838A/MAX4840A), VIN increasing

from 0V to 6V (MAX4842A), IGATE = 80% of

IPD, Figure 3

1.5

µs

Disable Time

tDIS

VEN = 2.4V, VGATE = 0.3V, Figure 4

µs

SUPPLY CURRENT vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

100

200

300

400

500

600

030

REVERSE CURRENT

vs. OUTPUT VOLTAGE

OUTPUT VOLTAGE (V)

5.0

4.5

4.0

100

1000

0.1

3.5

5.5

SINGLE MOSFET

BACK-TO-BACK MOSFETS

MAX4838A/MAX4840A

GATE VOLTAGE vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

MAX4840A

MAX4838A

Typical Operating Characteristics

(VIN = +5V (MAX4838A/MAX4840A), VIN = +4V (MAX4842A); Si9936DY external MOSFET in back-to-back configuration; TA = +25°C,

unless otherwise noted.)

Note 1: All parts are 100% tested at +25°C. Electrical limits across the full temperature range are guaranteed by design and

correlation.

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