High-Voltage, Dual-Input, USB/AC

Adapter Chargers in 2mm x 3mm TDFN

6

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Pin Description

PIN

NAME

FUNCTION

1

BAT

Battery Connection. The IC delivers charging current and monitors battery voltage using BAT. Bypass BAT to

GND with a 2.2µF or larger ceramic capacitor. BAT is high impedance when the IC is disabled.

2

USBPWR

USB Power Status Output. USBPWR is internally pulled low if a valid voltage is present at USB, otherwise it is

high impedance. USBPWR circuitry is active regardless of SET and charger on/off status.

3

POK

Power-OK Monitor. POK is an open-drain output that is internally pulled low when a valid charging source is

4DC

DC Input Supply. Connect DC to a 4.15V to 7V charging source. Bypass DC to GND with a 1µF or larger

ceramic capacitor. DC takes priority over USB when both are valid.

5

USB

USB Input Source. Connect USB to a USB port. Bypass USB to GND with a 1µF or larger ceramic capacitor.

6

CHG

Charging-Status Output. CHG is internally pulled low when the battery is being charged. CHG is high

impedance when the charger is in top-off mode or disabled.

7

SET

Enable/Disable, Charging Current, and Top-Off Threshold Set Input. Drive SET low to enable DC charge

mode and drive high to enable USB charge mode. If both DC and USB inputs are present, SET is used for

the DC charge mode only and USB charge is disabled. SET is also used for programming the charge current

and top-off threshold. See the DC/USB Mode and Charging Current Setting section for details.

8

GND

Ground

—

EP

Exposed Paddle. Connect to the GND plane for optimum thermal dissipation.

CHARGE CURRENT

vs. AMBIENT TEMPERATURE

AMBIENT TEMPERATURE (

°C)

-40

-15

10

35

60

85

200

300

400

500

600

700

DC CHARGE MODE 650mA

BATTERY REGULATION VOLTAGE

vs. LOAD CURRENT

LOAD CURRENT (mA)

0

100

200

300

400

500

600

700

4.10

4.15

4.20

4.25

4.30

550mA CHARGE-CURRENT SETTING

Typical Operating Characteristics (continued)

BATTERY REGULATION VOLTAGE

vs. AMBIENT TEMPERATURE

AMBIENT TEMPERATURE (

°C)

-40

-15

10

35

60

85

4.180

4.186

4.192

4.198

4.204

4.210

USB MODE

DC MODE