API9221FCG datasheet(8/17 Pages) DIODES

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API9221

Car/Wall or USB Supply Input Lithium Battery Charger

with OVP USB Bypass and 10mA LDO

API9221

Document number: DS32204 Rev. 1 - 2

8 of 17

www.diodes.com

May 2010

Functional Description

Logic Description

A Logic State Table and diagrams of timing and charge profile are given at the end of this description.

The battery charge function is disabled when the EN input is pulled to logic HIGH. This normally requires an

external pull-up resistor connected to the system microcontroller I/O power supply. The API9221 has an internal

resistor connected from this pin to GND, typically 600k

Ω. In many applications a suitable pull-up resistor value is

100k

Ω. When EN is pulled LOW or left open circuit, charging is enabled as described below.

There are two open-drain logic outputs, PPR and CHG . Each of these can use an external pull-up resistor to an

appropriate supply such as the microcontroller I/O supply, or can be left open circuit. A suitable value is 100k

Ω.

Alternatively these can each be used to drive an indicator LED up to a maximum of 10mA.

The output PPR is LOW when a valid power supply voltage is present at the VDC input or at the VUSB input,

independent of EN . One of the two input voltages must be greater than the power-on threshold and less than the

overvoltage protection threshold.

The output CHG is LOW when the battery is charging, but only until the End-of-Charge (EOC) condition is

reached. Together with other conditions as described below, the voltage at the battery connection BAT is used to

control the charging current. In the EOC state, CHG is HIGH to indicate that the charging phase has completed

and the battery voltage has reached 4.2V (± 1%). In this state, the charger remains active and is able to supply

load current and top up the battery as necessary. CHG may be re-set as described below under Charge

Conditions.

Auxiliary Outputs

The USB_BYP and VDC_LDO outputs are available independently of the EN input state. This allows a host

controller to power up initially.

USB Bypass, USB_BYP

The output USB_BYP provides power from the USB input when a valid power supply voltage is present at the

VUSB input. It is current limited to 400mA (nominally). It is therefore safely limited in current and voltage within

the USB standard.

VDC Low dropout regulator VDC_LDO

This output provides a regulated 4.94V supply, up to 10mA, when a valid power supply voltage is present at the

VDC input.

Charge Conditions

Before charging can begin, one of the two input voltages must also exceed the battery voltage enough to

overcome the input-output comparator offset. When one of the supplies satisfies these conditions, and EN is

LOW

, charging begins regardless of the state of the other supply. The valid input conditions are:

for VDC:

VPOR < VDC < OVPVDC

and

VDC > VBAT + VOSHC

for VUSB:

VPOR < VUSB < OVPVUSB

and

VUSB > VBAT + VOSHC

where VPOR is the rising power-on threshold voltage, and VOSHC is the rising input offset voltage relative to VBAT.

All these threshold voltages have defined hysteresis.

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