AIC1804BCS datasheet(8/12 Pages) AIC

Part #	AIC1804BCS

Description	Three- Or Four-Cell Lithium-Ion Battery Protection IC

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Manufacturer	AIC [Analog Intergrations Corporation]

Direct Link	http://www.analog.com.tw

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AIC1804

8

the

positive

terminal

of the

battery cell BAT3

for

cell-

balancing

bleeding function

under overcharge condition.

PIN12: VC2 -

Input

for

battery

BAT3

voltage sensing. This pin is to be

connected

to

the

positive

terminal of the battery cell BAT3.

PIN13: UD2 -

This pin is to be connected to the

positive terminal of the battery

cell

BAT2

for

cell-balancing

bleeding

function

under

overcharge condition.

PIN14: VC1 -

Input

for

battery

BAT2

voltage sensing. This pin is to be

connected

to

the

positive

terminal of the battery cell BAT2.

PIN15: UD1 -

This pin is to be connected to the positive terminal of the batt

PIN16: VCC -

Power supply pin and input for

battery BAT1 voltage sensing.

This pin is to be connected to the

positive terminal of the battery

cell BAT1.

n APPLICATION INFORMATIONS

THE OPERATION

Initialization

On initial power-up, such as connecting the

battery pack for the first time to the AIC1804, the

AIC1804

enters

the

power-down

mode.

A

charger must be applied to the AIC1804 circuit

to enable the pack.

Overcharge Protection

When the voltage of either of the battery cells

exceeds

the

overcharge

protection

voltage

(VOCP) beyond the overcharge delay time (TOC)

period, charging is inhibited by the turning-off of

the

charge

control

MOSFET

M2.

The

overcharge delay time is set by the external

capacitor

CTC.

Inhibition

of

charging

is

immediately released when the voltage of the

overcharged

cell

becomes

lower

than

overcharge release voltage (VOCR or VOCP-VHYS)

through discharging.

Overdischarge Protection

When the voltage of either of the battery cells

falls below the overdischarge protection voltage

(VODP) beyond the overdischarge delay time

(TOD) period, discharging is inhibited by the

turning-off of the discharge control MOSFET M1.

The overdischarge delay time is set by the

external capacitor CTD. Inhibition of discharging

is immediately released when the voltage of the

overdischarge cell becomes higher than the

overdischarge release voltage (VODR) through

charging.

Overcurrent Protection

In normal

mode,

the

AIC1804

continuously

monitors the discharge current by sensing the

voltage of CS pin. If the voltage VCC-VCS

exceeds the overcurrent protection voltage (VOIP)

beyond the overcurrent delay time (TOI) period,

the overcurrent protection circuit operates and

discharging is inhibited by the turning-off of the

discharge control MOSFET M1. Discharging

must be inhibited for at least 256mS after

overcurrent takes place to avoid damage to

external

control

MOSFETs

due

to

rapidly

switching transient between BATT+ and BATT-

terminals. The overcurrent condition returns to

normal mode when the load is released and the

impedance between the BATT+ and BATT-

terminals is 20M

Ω or higher.

The

AIC1804

is

provided

with

the

three

overcurrent detection levels (0.15V, 0.3V and

1.0V) and the three overcurrent delay time (TOI1,

TOI2 and TOI3) corresponding to each overcurrent

detection level. TOI1 is set by the external

capacitor CTI. TOI2 and TOI3 default to 4mS and

300

µs respectively, and can not be adjusted due

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