AAT4620

PCMCIA Current Limit Interface and Capacitor Charger

DATA SHEET

1

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201943A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 15, 2012

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 conjunction 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 PCMCIA 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 hysteresis is provided with the

addition of an external resistor. The quiescent supply cur-

rent is typically a low 40μA. In shutdown mode, the sup-

ply 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.

Features

• V

• Dual Independent Current Limits

• Reverse Current Blocking Protection

• Power Loop

• Low Quiescent Current

• Only 1.4V Needed for Enable Control Pin

• System READY Output with Externally Programmable

Hysteresis

• Under-Voltage Lockout

• Temperature Range: -40°C 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

GND

EN IL

EN IU

ISETU

ISETL

OUT

RDY

SuperCap

To Load

VCC

100k

Ω

To μC

Under-

Voltage

Lockout

1.2V

Reference

Current

Limit

Control

Reverse

Blocking

Over-Temp

Protection

Power

Loop