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AAT4621 Datasheet Preview

AAT4621 Datasheet

PC Card Current Limit Interface and Capacitor Charger

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DATA SHEET
AAT4621
PC Card Current Limit Interface and Capacitor Charger
General Description
The AAT4621 SmartSwitch family is a current limited
P-channel MOSFET power switch designed for high-side
load-switching applications in PC Card GSM/GPRS/3G
modem cards. Used in conjunction with a super capaci-
tor, the AAT4621 will ensure that the power ratings of
the PCMCIA host are not exceeded at any time. Featuring
two independent, programmable current limits and a
power loop, the AAT4621 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 AAT4621 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 current is typically a low 40μA. In shut-
down mode, the supply current decreases to less than
1μA. The AAT4621 has a current limit range from 75mA
to 1200mA; the AAT4621-1 has a current limit range
from 150mA to 2400mA.
The AAT4621 is available in a thermally enhanced,
Pb-free 14-pin TDFN33 package and is specified over the
-40°C to 85°C temperature range.
Features
• Operating Voltage Range: 3.0V to 5.5V
• Dual Independent Current Limits
AAT4621: 75mA to 1200mA
AAT4621-1: 150mA to 2400mA
±10% Current Accuracy
• Reverse Current Blocking Protection
• Power Loop
• Low Quiescent Current
40μA Typical
1.0μA Max with Switch Off
• 65mTypical RDS(ON) at 3V
• System READY Output with Externally Programmable
Hysteresis
• Only 1.4V Needed for Enable Control Pin
• Under-Voltage Lockout
• Over-Temperature Protection
• Temperature Range: -40 to 85°C
• 14-Pin TDFN33 Package
Applications
• Capacitor Charger
• CF Card Port Power Protection
• Express Card GSM/GPRS/3G Modems
• PC Card GSM/GPRS Class 10/12 Modems
• WiMAX Cards
Typical Application
VCC
ENIL
ENIU
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
100k
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
201944A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 15, 2012
1




Skyworks

AAT4621 Datasheet Preview

AAT4621 Datasheet

PC Card Current Limit Interface and Capacitor Charger

No Preview Available !

DATA SHEET
AAT4621
PC Card Current Limit Interface and Capacitor Charger
Pin Descriptions
Pin #
1
2
3
4
5, 6, 7
8, 9, 10, 11
12
13
14
EP
Symbol
RDY
RHYS
ISETU
ISETL
OUT
VCC
GND
EN IL
EN IU
EP
Function
System ready pin. Open drain, active low, initiated when the capacitor is 98% charged.
System READY hysteresis. Connect a resistor to ground to set the System Ready comparator hysteresis.
Upper current limit set input. A resistor from ISETL to ground sets the maximum upper current limit for
the switch. The AAT4621 has a current limit range from 75mA to 1200mA; the AAT4621-1 has a current
limit range from 150mA to 2400mA. Connect to ground to disable current limit.
Lower current-limit set input. A resistor from ISETU to ground sets the maximum lower current limit for
the switch. The AAT4621 has a current limit range from 75mA to 1200mA; the AAT4621-1 has a current
limit range from 150mA to 2400mA. Connect to ground to disable current limit.
P-channel MOSFET drain connection. Connect to super capacitor from OUT to GND.
Input pins to the P-channel MOSFET source. Connect 1μF capacitor from VCC to GND.
Device ground connection.
Enable input. Active low enable with internal pull up. Also switches in the lower current limit initiating
the super capacitor to start charging.
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 B and EN IU B are enabled, ISETU will be selected.
The exposed thermal pad (EP) must be connected to the board ground plane and Pin 12. The ground
plane should include a large exposed copper pad under the package for thermal dissipation (see pack-
age outline).
Pin Configuration
TDFN33-14
(Top View)
RDY 1
RHYS 2
ISETU 3
ISETL 4
OUT 5
OUT 6
OUT 7
14 ENIU
13 ENIL
12 GND
EP 11 VCC
10 VCC
9 VCC
8 VCC
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2 201944A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 15, 2012


Part Number AAT4621
Description PC Card Current Limit Interface and Capacitor Charger
Maker Skyworks
Total Page 17 Pages
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