3

FN9180.0

Typical Applications

To Battery

CRDL

BAT

ICDL

USBP

To USB

Connector

C

1

R

3

C

3

USB

EN

CHG

C

2

To Cradle

Connector

R

ICDL

R

1

IUSB

R

IUSB

500mA

100mA

GND

PPR

R

2

D

1

D

2

Disable

Enable

A Simple Charger Accepting Power from Both a USB Port and a Desktop Cradle

A Simple Charger with Programmable Charge Current and Wide Input Voltage Range

COMPONENT SELECTION

1.82k

Ω for 0.8A cradle charge current

80k

Ω for 100mA/500mA USB charge current

350

Ω

1µF ceramic capacitor

1

Ω

LEDs

COMPONENT SELECTION

1.82k

Ω for 0.8A cradle charge current

1µF ceramic capacitor

floating in the design for a single input charger.

ISL6293-2

To Battery

USB

BAT

ICDL

GND

USBP

C

2

CRDL

CHG

PPR

C

1

To Cradle

Connector

R

ICDL

IUSB

Disable

Enable

EN

ISL6293