AP1212

Dual USB High-Side Power Switch

This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of

this product. No rights under any patent accompany the sale of the product.

Rev. 1.0 Sep.23, 2004

1/11

Features

- Compliant to USB specifications

- Dual independent switches control

- 2.7V to 5.5V input voltage

- 500mA minimum continuous current per port

- 110mΩ typical on-resistance

- 1.25A maximum short circuit current limit

- Independent open-drain fault flag pins

- 110μA typical on-state supply current

- 1μA typical off-state supply current

- Output can be forced higher than input (off-state)

- Thermal shutdown

- 2.4V typical under voltage lockout (UVLO)

- 1ms turn-on (soft-start) and fast turn-off

- Enable active-high (H) or active-low (L)

- 8-pin SOP and PDIP packages

Applications

•

USB hubs

•

Hot plug-in power supplies

•

Battery-charger circuits

General Description

The AP1212 series are dual integrated high-side

power switch with independent enable and flag

functions,

optimized

for

self-powered

and

bus-powered

Universal

Serial

Bus

(USB)

applications. The AP1212 series support the

following USB requirements: each switch channel

supplies up to 500mA as required by USB

downstream devices; the switch’s low on-resistance

meets USB voltage drop requirements; fault current

is limited to typically 1000mA, well below the UL

25VA safety requirements; and a flag output is

available to indicate fault conditions to the local

USB controller. Soft start eliminates the momentary

voltage drop on the upstream port that may occur

when the switch is enabled in bus-powered

applications.

Additional features include thermal shutdown to

prevent catastrophic switch failure from high-current

loads, under voltage lockout (UVLO) to ensure that

the device remains off unless there is a valid input

voltage present, and 3.3V and 5V logic compatible

enable inputs.

Pin Assignments

EN1

EN2

FLG1

FLG2

1

2

3

4

8

7

6

5 OUT2

OUT1

GND

IN

PDIP/SOP

AP1212

(Top View)

Pin Descriptions

Name

Description

EN1

EN2

Enable: Logic-compatible enable

input. ( H: active high, L: active low).

Do not float.

FLG1

FLG2

Fault Flag: Active-low, open-drain

output. Indicates over current,

UVLO, and thermal shutdown.

GND

Supply return.

IN

Supply Input: Output MOSFET drain.

Also supplies IC’s internal circuitry.

Connect to positive supply.

OUT1

OUT2

Switch Output: Output MOSFET

source. Typically connect to

switched side of load.