ACT2823 datasheet(16/25 Pages) ACTIVE-SEMI

Nome de Peças	ACT2823

Descrição Electrónicos	Dual Cell Li-Ion Battery Charger and Power Bank Manager

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Fabricante Electrônico	ACTIVE-SEMI [Active-Semi, Inc]

Página de início	http://www.active-semi.com

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ACT2823

REV 1, 01-DEC-2016

Innovative PowerTM

ActiveSwitcherTM

is a trademark of Active-Semi.

16

)

5

(

)

(

)

(

2160

)

(









k

R

m

R

I

k

mV

V

IMC

CS

BAT

IMC

As an example, if RCS=50mΩ, RIMC=216kΩ, and the

battery charging current is 1.5A, then the ACT2813

increases the LED voltage threshold by 750mV.

LED Hysteresis Window Setting

The LED Hysteresis Window compensates for the

increase and decrease in battery voltage associated

with charging and discharging. It provides fixed voltage

adjustment to the LED threshold settings. When in the

battery is charging, the LED threshold settings are

increased by the LED hysteresis voltage. When the

battery is discharging, the LED threshold settings are

decreased by the LED hysteresis voltage. This setting

has no effect in HZ Mode. Connecting a resistor

between the HYST pin and AGND program the

hysteresis between adjusts for battery impedances

between 0mV and 720mV. Note that the ACT2823 has

100mV of built in hysteresis that cannot be changed.

The following equations calculate the proper RHYST

resistance. Note that LED1 and LED2 use one equation

while LED3 and LED4 use another equation.



)

6

(

)

(

32.4k

k

R

2

:

1

:2

1

HYST

V

HYST

















)

7

(

)

(

27k

k

R

4

:

3

:4

3

HYST

V

HYST















Where VHYST is the desired LED hysteresis in volts.

RHYST(1) = 54kΩ to set LED1 hysteresis equal to 600mV.

RHYST(3) = 45kΩ to set LED3 hysteresis equal to 600mV.

The following table provides RHYSTvalues for different

hysteresis voltages.

RHYST (kΩ)

LED1

VHYST

LED2

VHYST

LED3

VHYST

LED4

VHYST

Floating

0mV

270

120mV

100mV

135

240mV

200mV

90

360mV

300mV

67.5

480mV

400mV

54

600mV

500mV

45

720mV

600mV

LED Trigger Voltage

The battery voltage that triggers each LED to turn on

and off is a function of the LED voltage threshold, the

impedance compensation voltage, the LED hysteresis

setting, and whether the battery is charging or

discharging. The figure below graphically shows the

LED trip points as a function of these inputs.

Charging LED

Threshold - Rising

Charging LED

Threshold - Falling

Discharging LED

Threshold - Rising

Discharging LED

Threshold - Falling

VIMC

VHYST

VIMC

VHYST

100mV Internal

Hysteresis

100mV Internal

Hysteresis

VLEDx

Figure 6: LED threshold setting

BATTERY TEMPERATURE MONITERING

The ACT2823 monitors the battery pack temperature by

measuring the voltage at the TH pin. The TH pin is

connected to the thermistor resistor network which

includes a negative temperature coefficient thermistor.

An internal current source provides a bias current to

generate a voltage on the TH pin. The ACT2823

compares the voltage at the TH pin with the internal

VTHH and VTHL thresholds to determine if charging or

discharging is allowed. Charging latches off and triggers

a fault in the I2C register 0x08h when VTH<VTHL or

VTH >VTHH. Charging cannot be started until the fault

condition goes away. After VTH returns to the normal

range, one of the following three conditions can restart

charging.

1. Assert PB when the latch off bit in register 0x05h = 0

2. Clear the fault status bits in register 0x08h standby

3. Recycle input power

+

–

+

–

TH

VTCL=1V

NTC

VTCH=2.5V

+

–

+

–

VTDL=0.57V

VTDH=2.5V

IDIS=100 uA

ICHG=140uA

ACT2823

CHG_HOT

CHG_COLD

DIS_HOT

DIS_COLD

Rb

Ra

Li+ Battery

Pack

Figure 7: Thermistor Resistor Network

RNTCc : NTC Resistor at cold temperature (Tcold)

RNTCh : NTC Resistor at hot temperature (Thot)

Nº de peça semelhante - ACT2823

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
Active-Semi, Inc	ACT2823QJ-T1000	1Mb / 25P	Dual Cell Li-Ion Battery Charger and Power Bank Manager REV 1, 01-DEC-2016
	ACT2823QJ-T1435	1Mb / 25P	Dual Cell Li-Ion Battery Charger and Power Bank Manager REV 1, 01-DEC-2016
	ACT2823	1Mb / 25P	Dual Cell Li-Ion Battery Charger and Power Bank Manager REV 1, 01-DEC-2016

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Descrição semelhante - ACT2823

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
Active-Semi, Inc	ACT2823	1Mb / 25P	Dual Cell Li-Ion Battery Charger and Power Bank Manager REV 1, 01-DEC-2016
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Intersil Corporation	ISL94212INZ	2Mb / 96P	Multi-Cell Li-Ion Battery Manager April 23, 2015
Intersil Corporation	ISL78600ANZ	809Kb / 22P	Multi-Cell Li-Ion Battery Manager January 20, 2015
Renesas Technology Corp	ISL78610	3Mb / 100P	Multi-Cell Li-Ion Battery Manager
Renesas Technology Corp	ISL94212	3Mb / 96P	Multi-Cell Li-Ion Battery Manager
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ACT2823 Folha de dados(PDF) 16 Page - Active-Semi, Inc

ACT2823 Folha de dados(HTML) 16 Page - Active-Semi, Inc

Nº de peça semelhante - ACT2823

Descrição semelhante - ACT2823

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