MAX4272(2001) Ver la hoja de datos (PDF) - Maxim Integrated

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Fabricante

MAX4272
(Rev.:2001)

3V to 12V Current-Limiting Hot Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection

Maxim Integrated 

3V to 12V Current-Limiting Hot Swap Controllers

with Autoretry, DualSpeed/BiLevel Fault Protection

Typical Operating Characteristics (continued)

(VIN = 5V, RSENSE = 100mΩ, CBOARD = 47µF, TA = +25°C, unless otherwise noted.)

STARTUP TIME (CBOARD = 0)

MAX4271/3-35

ON

VGATE

2V/div

VOUT

2V/div

VGATE

2V/div

VOUT

2V/div

TURN-OFF TIME (CBOARD = 0)

MAX4271/3-37

ON

ILOAD

1A/div

0

100µs/div

CBOARD = 0, RSENSE = 100mΩ,

CTIM = 10nF, CGATE = 0

0

50µs/div

CBOARD = 0, RSENSE = 100mΩ,

CGATE = 0, RS = 0

MAX4271

MAX4272

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1

2

3

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4

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5

PIN

MAX4273

NAME

FUNCTION

Pin Description

Current-Sense Threshold Setting Input. Connect a resistor from RTH to VIN to set the

1

RTH

fast comparator threshold. Bypass to VIN with 0.1µF. Connect RTH to VIN to disable

both the fast comparator and current regulation at startup. Short RTH to GND for a

200mV threshold. See Fast Comparator Threshold section.

Auxiliary Supply Input. Supply input for short-circuit switchover. To use this, connect a

2

AUXVCC 1µF capacitor from AUXVCC to GND; otherwise, leave floating. See Auxiliary VCC

section.

3

IN

Input Voltage. Connect to +2.7V to +13.2V supply; 15V absolute maximum voltage

rating.

4

SENSE Current-Sense Resistor Voltage Input. RSENSE is connected from IN to SENSE.

5

GATE Gate Drive Output. Connect to gate of external N-channel pass transistor.

External Gate Capacitance Connection. Connect a capacitor from CEXT to GATE to

6

CEXT

increase the gate charging time. This pin goes high impedance during a fast

comparator fault for fast discharge.

7

LLMON Load Line Monitor. Connect to the source of the external N-channel MOSFET. The

external FET is turned on only when the load voltage is less than 100mV.

8

GND Ground

9

CTON

Startup Timer Input. Leave floating or connect the timing capacitor from CTON to GND.

See Startup and Retry Timers section.

10

CSPD

Slow Comparator Speed Setting. Leave floating or connect the timing capacitor from

CSPD to GND. See Slow Comparator Response Time section.

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