AIC1802 データシートの表示（PDF） - Analog Intergrations

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AIC1802

Two-Cell Lithium-Ion Battery Protection IC

Analog Intergrations 

n BLOCK DIAGRAM

AIC1802

VCC 8

450

VC 6

450

GND 4

OVERCHARGE

DETECTOR 1

OVERDISCHARGE

DETECTOR 1

UNBALANCE

DISCHARGE

OVERCHARGE

DETECTOR 2

OVERDISCHARGE

DETECTOR 2

OVERCHARGE

DELAY CIRCUIT

5

TC

OVERDISCHARGE

DELAY CIRCUIT

POWER-

DOWN

LOGIC

CONTROL

WAKE-

UP

TIMING

GENERATION

3

TD

VCC

1

OC

OD 2

OVERCURRENT

DELAY CIRCUIT

OVERCURRENT

DETECTOR

CHARGE

DETECTION

7 CS

n PIN DESCRIPTIONS

PIN 1: OC

- PMOS open drain output for

control of the charge control

MOSFET M2. When overcharge

occurs, this pin sources current to

switch the external NPN Q1 on,

and charging is inhibited by

turning off the charge control

MOSFET M2.

PIN 2: OD

- Output pin for control of the

discharge control MOSFET M1.

When overdischarge occurs, this

pin goes low to turn off the

discharge control MOSFET M1

and discharging is inhibited.

PIN 3: TD - Overdischarge delay time setting

pin.

PIN 4: GND - Ground pin. This pin is to be

connected to the negative terminal

of the lower battery cell.

PIN 5: TC - Overcharge delay time setting

pin.

PIN 6: VC

- To be connected to the positive

terminal of the lower cell and

the negative terminal of the

upper cell.

PIN 7: CS

- Input pin for current sensing.

Using the drain-source voltage

of the discharge control

MOSFET M1 (voltage between

CS and GND), it senses

discharge current during normal

mode and detects whether

charging current is present

during power down mode.

PIN 8: VCC - Power supply pin. It is to be

connected to the positive

terminal of the upper cell.

6

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