AAT4620_12 Datasheet, PDF (1/14 Pages) Skyworks Solutions Inc. – PCMCIA Current Limit Interface and Capacitor Charger

DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
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_IN 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
• 65m Typical R_{DS(ON) at 3V}
• 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
VCC
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
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
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201943A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 15, 2012