ACT2804 datasheet(13/20 Pages) ACTIVE-SEMI

13 / 20 page

Rev 2, Feb-04-2016

Innovative PowerTM

- 13 -

www.active-semi.com

ACT2804

APPLICATIONS INFORMATION

Figure 5: LED Indication

In discharge mode, when battery voltage goes

below LED1 threshold, LED1 starts flashing until

Buck (discharge mode) turns off due to either light

load or Buck UVLO. The flash frequencies for all

the LEDs are 0.5Hz with 1s on and 1s off.

In HZ mode, when PB is pressed for 40ms, Buck

turns on. If VBAT<LED1, LED1 starts flashing until

Buck turns off.

Conventional indication patterns could behave to

have two application. Setting RPT=4kΩ to have

“Always On”, setting RPT=12kΩ to have “5s

Indication”. The behaviors for both setting are same

in charge mode.

See below table for more information.

Below shows 4 LED indication patterns.

LED1-4 Refreshing Cycle

Every time when VIN is plugged in or a PB is

pushed, LED1, 2, 3, 4 turns on sequentially at 0.5s

interval, like a LED scanning, and then goes into

corresponding mode defined by PT pin.

LED1-4 Fault Alarm Signal

At fault conditions, actions are taken. In the

meantime, all the 4 LEDs turn on/off with 0.5s on

and 0.5s off for 10 seconds to send alarm signal

out. The fault conditions include battery OVP, UVP,

OTP.

PCB Board Layout Guidance

When laying out the printed circuit board, the

following checklist should be used to ensure proper

operation of the IC.

1. Arrange the power components to reduce the

AC loop area.

2. Place the decoupling ceramic capacitor as

close to BAT pin as possible. Use different

capacitance combination to get better EMI

performance.

3. Place the decoupling ceramic capacitors close

to VIN pin, VOUT pin, and BAT pin.

4. Use copper plane for power GND for best heat

dissipation and noise immunity.

5. Use Kevin sense from sense resistors to CSP

and CSN1, CSN2 pins, and the sense resistor

from BATS and BATP pins.

6. SW pad is a noisy node switching. It should be

isolated away from the rest of circuit for good

EMI and low noise operation.

7. Thermal pad is connected to GND layer through

vias. PGND and AGND should be single-point

connected.

8. RC snubber and external Schottky diode across

SW to PGND can be added as needed for

reducing

spike

and

better

EMI

performance.

INDICATION PATTERN

RPT

Conventional

Always On In Discharge

4kΩ

Conventional

5s Indication in Discharge

12kΩ

Breathing

5s Indication in Discharge

24kΩ

Bottom Charging

5s Indication in Discharge

40kΩ

Circulating

5s Indication in Discharge

56kΩ

Conventional

Breathing

Bottom

Charging

Circulating

Flash

Always on

Circulating on

Breathing on/off

<25%

EOC

Off

75% SOC<100%

25% SOC<50%

50% SOC<75%

VREG

LED1

LED2

LED3

LED4

ACT2804

GND

BAT

BATS

BATP

BATC

CBD

BATN

LEDS1

LEDS2

LEDS3

LEDS4

RPT

RS1

RS2

RS3

RS4

ACT2804 数据表(PDF) 13 Page - Active-Semi, Inc

ACT2804 数据表(HTML) 13 Page - Active-Semi, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

数据表下载

链接网址

ACT2804 数据表(PDF) 13 Page - Active-Semi, Inc

ACT2804 数据表(HTML) 13 Page - Active-Semi, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

数据表 下载

链接网址

数据表下载