AIC1811CCV datasheet(6/8 Pages) AIC

Part #	AIC1811CCV

Description	One-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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AIC1811

6

detection circuitry. Charging is determined to be in

progress if the voltage between CS and GND is

below charge detection threshold voltage (VCH).

DESIGN GUIDE

Selection of External Control MOSFETs

Because the overcurrent protection voltage is

preset,

the

threshold

current

for

overcurrent

detection is determined by the turn-on resistance

of the discharge control MOSFET M1. The turn-on

resistance of the external control MOSFETs can

be determined by the equation: RON=VOIP/ (2 x IT)

(IT is the overcurrent threshold current). For

example, if the overcurrent threshold current IT is

designed to be 3A, the turn-on resistance of the

external control MOSFETs must be 33m

Ω. Users

should be aware that turn-on resistance of the

MOSFET changes with temperature variation due

to heat dissipation. It changes with the voltage

between

gate

and

source

as

well.

(Turn-on

resistance of a MOSFET increases as the voltage

between gate and source decreases). Once the

turn-on

resistance

of

the

external

MOSFET

changes, the overcurrent threshold current will

change accordingly.

Suppressing the Ripple and Disturbance

from Charger

To suppress the ripple and disturbance from

charger,

connecting

R1,

C1

to

VCC

is

recommended.

Protection at CS pin

R2 is used for latch-up protection when charger is

connected under overdischarge condition and

overstress protection at reverse connecting of a

charger. Larger value of R2 reduces the charger

leakage current in overcharge mode, but possibly

disables

the

charge

detection

function

after

overdischarge.

Resistance

of

51K

Ω

is

recommended.

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AIC1811CCV Datasheet(PDF) 6 Page - Analog Intergrations Corporation

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