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AAT4620 Datasheet Preview

AAT4620 Datasheet

PCMCIA Current Limit Interface and Capacitor Charger

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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
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
65mTypical 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°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
ENOPERATION
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 • sales@skyworksinc.com • www.skyworksinc.com
201943A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 15, 2012
1




Skyworks

AAT4620 Datasheet Preview

AAT4620 Datasheet

PCMCIA Current Limit Interface and Capacitor Charger

No Preview Available !

DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
Pin Descriptions
Pin #
1
2
3
4, 5, 6
7, 8
9
10
11
12
Symbol
EN IU
EN IL
GND
VCC
OUT
ISETL
ISETU
RHYS
RDY
Function
Enable input. Active low enable with internal pull up. Also switches in the higher current limit to allow the
System to start functioning. Can be directly connected to System Ready for automatic enabling. When
both EN IL and EN IU are enabled, ISETU will be selected.
Enable input. Active low enable with internal pull up. Also switches in the lower current limit initiating the
super capacitor to start charging.
Device ground connection.
Input pins to the P-channel MOSFET source. Connect 1μF capacitor from VCC to GND.
P-channel MOSFET drain connection. Connect to super capacitor from OUT to GND.
Lower current-limit set input. A resistor from ISETL to ground sets the maximum lower current limit for
the switch. Current limit can be set between 100mA and 1200mA.
Upper current limit set input. A resistor from ISETU to ground sets the maximum upper current limit for
the switch. Current limits can be set between 100mA and 1200mA. Connect to ground to disable current
limit.
System READY hysteresis. Connect a resistor to ground to set the System Ready comparator hysteresis.
System ready pin. Open drain, active low, initiated when the capacitor is 98% charged.
Pin Configuration
TSOPJW-12
(Top View)
EN IU
EN IL
GND
VCC
VCC
VCC
1
2
3
4
5
6
12 RDY
11 RHYS
10 ISETU
9 ISETL
8 OUT
7 OUT
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2 201943A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 15, 2012


Part Number AAT4620
Description PCMCIA Current Limit Interface and Capacitor Charger
Maker Skyworks
Total Page 14 Pages
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