ISL9219

FN6606 Rev 2.00

Page 4 of 12

April 7, 2010

Pin Descriptions

VIN (Pins 1, 20)

Input supply voltage, Connect a 1µF ceramic capacitor to

power ground.

USBI (Pin 2)

USB power type selection logic input. When this pin is left

floating or driven to logic LOW, the USB port is regarded as

a low-power port with 100mA maximum output current. In

such cases, the charge current is internally set to 85mA.

When this pin is driven to logic HIGH, the USB port is

considered a high-power port with a 500mA maximum

current available. In such cases, the charge current is set at

430mA regardless of the ISET resistor. There is a 600k

pull-down resistor between the USBI pin to GND.

AC_IN (Pin 3)

Input source type configuration pin. Pull this pin to logic HI to

configure the charger for an AC adapter. If this pin is left

floating or driven to logic LO, the charger is configured for

USB source type, where the charge current is set at 430mA

or 85mA, depending on the USBI status. There is a 600k

pull-down resistor between the AC_IN pin to GND.

TRKL (Pin 4)

Open-drain indication pin which turns on when charger is in

trickle mode, otherwise turns off. This pin is capable to sink

20mA minimum current to drive an LED.

STAT1 (Pin 5)

Open-drain indication pin. In conjunction with STAT2 this pin

provides a unique indication for each charging state of the

cycle. This pin is capable to sink 20mA minimum current to

drive an LED.

STAT2 (Pin 6)

Open-drain indication pin. In conjunction with STAT1 this pin

provides a unique indication for each charging state of the

cycle. This pin is capable to sink 20mA minimum current to

drive an LED.

PRECH (Pin 7)

Pre-charge threshold voltage programming input pin.

Connect a resistor between this pin and GND to set the

threshold voltage by Equation 1:

ISET (Pin 8)

Charge-current programing and monitoring pin. Connect a

resistor between this pin and the GND pin to set the charge

current limit by Equation 2:

The ISET pin voltage also monitors the actual charge current

during the entire charge cycle, including the trickle, constant-

current, and constant-voltage phases. However, when the

dropout voltage is reached, the ISET pin voltage will no

longer follow the output current due to fact that the output

current is no longer controlled by the IC. When disabled,

VISET = 0V

ACFLT (Pin 9)

Open-drain indication pin which turns off when

the adapter

plugged in does not have sufficient current rating and

the resulting input voltage is dropped to below 4.4V.

This pin is capable to sink 20mA minimum current to drive an

LED. The open drain indication also turns off when an input

OVP condition (VIN > 6V) is encountered.

EN (Pin 10)

IC enable input. Drive this pin to logic LO or leave it floating

to enable the charger. Drive this pin to logic HI to disable the

charger. There is a 600k pull-down resistor between the EN

pin to GND.

PG (Pin 14)

The PG pin will be connected to VIN through an internal

P-Channel MOSFET when VIN is within the power good

window. Otherwise the PG pin is in a high impedance

(floating) state. When VIN is within the power good window,

the PG pin can source 20mA output current for the down

stream circuit. It is recommended that a 2.2µF ceramic

capacitor be connected at the PG pin to absorb any transient

voltage due to the delay turning off the PMOS under a fast

OVP condition.

TS (Pin 15)

Input for an external NTC thermistor for temperature

monitoring. A 5µA internal current source is provided at this

pin and the pin voltage is monitored and compared with the

set thresholds to provide over temperature protection.

TIMER (Pin 12)

The TIMER pin sets the oscillation period by connecting a

timing capacitor between this pin and GND. The oscillator

also provides a time reference for the charger. The timer

function can be disabled by connecting the TIMER pin to

GND. If the timer is disabled, there will be no timeout

function for any operation mode including trickle charge and

fast charge modes.



100

----------------------------------

V



=

(EQ. 1)

24000

-----------------

mA



=

(EQ. 2)