5

FN9180.0

Functional Pin Description

CRDL (Pin 1)

Cradle input. This pin is usually connected to a cradle power

input. The maximum input voltage is 28V. The charge

current from this pin is programmable with the ICDL pin up to

1A. When this pin is connected to a power source, no charge

current is drawn from the USB pin. A 1µF or larger value

ceramic capacitor is recommended for decoupling.

USB (Pin 2)

USB input. This pin is usually connected to a USB port

power connector. Other sources that are lower than 5.5V are

also acceptable. The charge current from the USB pin is

selectable between 100mA and 500mA maximum with the

ceramic capacitor is recommended for decoupling. It is also

recommended to have a 1

Ω resistor in series with the

decoupling capacitor to prevent an over-shoot voltage when

a USB cable is plugged in.

PPR (Pin 3)

Power presence indication. This is an open-drain output pin

that outputs a logic LOW when either the USB input voltage

or the CRDL input voltage is above its POR level, regardless

if the charger is enabled or disabled. This pin provides a

wake-up signal to a microprocessor when either the cradle

or the USB power is connected.

CHG (Pin 4)

Charge indication pin. When the charge current from the

cradle input during the constant current mode falls to below

8% of the programmed reference current by the ICDL pin or

the charge current from the USB input is below 10% of the

programmed charge current, the open-drain MOSFET is

turned off. The pin will be pulled to logic HIGH by the pull-up

resistor to indicate the End Of Charge.

USB Input Trickle Charge Current

45.0

50.0

55.0

%

END-OF-CHARGE CURRENT THRESHOLD

Powered From USB Pin

8.0

10.5

13.0

%

Powered From USB Pin

17.0

21.0

25.0

%

Powered From CRDL Pin

5.5

8.5

11.0

%

PRECONDITIONING CHARGE THRESHOLD

Preconditioning Charge Threshold Voltage

2.5

2.6

2.7

V

INTERNAL TEMPERATURE MONITORING

Current Foldback Threshold (Note 6)

85

100

115

°C

LOGIC INPUT AND OUTPUT

USBP Pin Logic Input High

2.0

-

-

V

USBP Pin Logic Input Low

--

0.4

V

USBP Pin Internal Pull Down Resistance

-

1000

-

k

Ω

EN Pin Logic Input High

1.2

-

-

V

EN Pin Logic Input Low

--

0.4

V

EN Pin Internal Pull Down Resistance

-

1000

-

k

Ω

CHG/PPR Sink Current

Pin Voltage = 0.8V

15

-

-

mA

NOTES:

than the POR threshold, no output pin can be used for indication.

4. The maximum and minimum limits are guaranteed over -40°C to 70°C ambient temperature range.

5. The charge current may be reduced by the thermal foldback function, depending on the heatsinking condition of the test setup.

6. The threshold value at which the charger output is reduced to near zero. Guaranteed by design, not tested.

Electrical Specifications

Typical Values Are Tested at USB = CRDL = 5V and ambient temperature is at 25°C, Unless Otherwise Noted.

All Maximum and Minimum Values Are Guaranteed Under the Recommended Operating Conditions. (Continued)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNITS

ISL6293