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AAT4620

PCMCIA Current Limit Interface and Capacitor Charger

Advanced Analogic Technologies 

General Description

The AAT4620 SmartSwitch is a current limited P-

channel MOSFET power switch designed for high-

side load-switching applications in PCMCIA

GSM/GPRS/3G modem cards. Used in conjunc-

tion with a super capacitor, the AAT4620 will

ensure that the power ratings of the PCMCIA host

are not exceeded at any time. Featuring two inde-

pendent, programmable current limits and a power

loop, the AAT4620 can ensure that the super

capacitor can be charged without exceeding PCM-

CIA specifications. The current limit is set by two

external resistors allowing a ±10% current limit

accuracy over the normal operating temperature

range. The switch can be controlled from either of

the two enable inputs and in the off condition will

block currents in both directions. The AAT4620

also incorporates a System READY function which

can advise the system that the super capacitor is

fully charged and ready for use. Adjustable hys-

teresis is provided with the addition of an external

resistor. The quiescent supply current is typically a

low 40µA. In shutdown mode, the supply current

decreases to less than 1µA.

The AAT4620 is available in a thermally enhanced,

Pb-free, 12-pin TSOPJW package and is specified

over the -40°C to 85°C temperature range.

AAT4620

PCMCIA Current Limit Interface

and Capacitor Charger

Features

SmartSwitch™

• VIN Range: 3.0V to 5.5V

• Dual Independent Current Limits

— 100mA to 1200mA

— ±10% Current Accuracy

— 20°C Temperature Band

• Reverse Current Blocking Protection

• Power Loop

• Low Quiescent Current

— 40µA Typical

— 1.0µA Max with Switch Off

• 65mΩ Typical RDS(ON) at 3V

• Only 1.4V Needed for Enable Control Pin

• System READY Output with Externally

Programmable Hysteresis

• Under-Voltage Lockout

• Temperature Range: -40 to 85°C

• 12-Pin TSOPJW Package

Applications

• CF Card Port Power Protection

• Express Card GSM/GPRS/3G Modems

• Hot Swap Supplies

• PCMCIA Card GSM/GPRS/3G Modems

• Personal Communication Devices

Typical Application

V CC

ENSUPERCAP

EN OPERATION

VCC

EN IL

Under-

Voltage

Lockout

Reverse

Blocking

Over-Temp

Protection

Power

Loop

EN IU

1.2V

Reference

GND

Current

Limit

Control

RHYS

OUT

RDY

100kΩ

To Load

To μC

ISETL

ISETU

RSETU

RSETL

SuperCap

4620.2007.04.1.1

1

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