Pin Descriptions

Pin Configuration

TSOPJW-12

(Top View)

1

2

3

4

5

6

12

11

10

9

8

7

EN IU

EN IL

GND

VCC

VCC

VCC

RDY

RHYS

ISETU

ISETL

OUT

OUT

Pin #

Symbol

Function

1

EN IU

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

2

EN IL

Enable input. Active low enable with internal pull up. Also switches in the lower current limit

initiating the super capacitor to start charging.

3

GND

Device ground connection.

4, 5, 6

VCC

Input pins to the P-channel MOSFET source. Connect 1µF capacitor from VCC to GND.

7, 8

OUT

P-channel MOSFET drain connection. Connect to super capacitor from OUT to GND.

9

ISETL

Lower current-limit set input. A resistor from ISETL to ground sets the maximum lower cur-

rent limit for the switch. Current limit can be set between 100mA and 1200mA.

10

ISETU

Upper current limit set input. A resistor from ISETU to ground sets the maximum upper cur-

rent limit for the switch. Current limits can be set between 100mA and 1200mA. Connect to

ground to disable current limit.

11

RHYS

System READY hysteresis. Connect a resistor to ground to set the System Ready com-

parator hysteresis.

12

RDY

System ready pin. Open drain, active low, initiated when the capacitor is 98% charged.

AAT4620

PCMCIA Current Limit Interface

and Capacitor Charger

2

4620.2007.04.1.1