FAN3989 datasheet(2/10 Pages) FAIRCHILD

Part #	FAN3989

Description	USB/Charger Detection Device with Load Switch

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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FAN3989 • 1.0.3

2

Pin Configuration

D+

GND

FLAG2

LS CTRL

D-

FLAG2

VBUS

VOUT

1

2

3

4

8

7

6

5

Figure 2.

Pin Configuration (Top View)

Pin Definitions

Pin#

Name

Type

Description

1

D+

Input

USB data input

2

GND

Input

Device ground

3

Flag2

Output

Over/under-voltage flag output

4

LSctrl

Output

PMOS switch control – pull-up connection to VBUS

5

Vout

Output

Voltage out

6

VBUS

Input

Power input from charger, USB device, or handheld battery

7

Flag1

Output

Charger/standard USB device detect flag

8

D-

Input

USB data input

Truth Table

Connection

State

VBUS

D-

D+

FLAG1 FLAG2 LS CTRL

Description

STD USB Device

0V

R to GND

LOW

HIGH

Load switch open

USB Charger

5V

Short to D+

Short to D-

HIGH

LOW

Normal state,

load switch closed

VBUS GT 6V

GT 6V

Short to D+

Short to D-

HIGH

LOW

HIGH

Load switch open

VBUS LT 3.3V

LT 3.3V

Short to D+

Short to D-

HIGH

LOW

HIGH

Load switch open

PC Data/Charger

5V

Open

LOW

HIGH

LOW

Load switch closed

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