AAT4620_12 Datasheet, PDF (2/14 Pages) Skyworks Solutions Inc. – PCMCIA Current Limit Interface and Capacitor Charger

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, I_SETU 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 ¹
EN IL ²
GND ³
VCC ⁴
VCC ⁵
VCC ⁶
12 _RDY
11 _RHYS
10 _ISETU
9 _ISETL
8 _OUT
7 _OUT
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