3V to 12V Current-Limiting Hot Swap Controllers

with Autoretry, DualSpeed/BiLevel Fault Protection

_______________________________________________________________________________________

9

Typical Operating Characteristics (continued)

Ω,

1A/div

2V/div

2V/div

0

50

µs/div

MAX4271/3-37

ON

0

Pin Description

Ω,

2V/div

2V/div

ON

100

µs/div

MAX4271/3-35

PIN

MAX4271

MAX4272

MAX4273

NAME

FUNCTION

—

1

RTH

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

200mV threshold. See Fast Comparator Threshold section.

—

2

AUXVCC

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

1

section.

13

IN

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

rating.

2

4

SENSE

3

5

GATE

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

—

6

CEXT

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

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.

4

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.

5

10

CSPD

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

CSPD to GND. See Slow Comparator Response Time section.