ACT2813 datasheet(9/23 Pages) ACTIVE-SEMI

9 / 23 page

Rev 2, 19-May-15

Innovative PowerTM

- 9 -

www.active-semi.com

ACT2813/ACT2813C

FUNCTIONAL DESCRIPTION

ACT2813/ACT2813C

complete

battery

charging and discharging power management

solution for applications of single-cell lithium-based

backup battery pack or power bank. There is a

power path from input to output. If output voltage

drops below 4.25V, the input switch Q1 turns off

and restart in 2 seconds.

With

the

advanced

ACT2813/ACT2813C

architecture, a synchronous buck/boost converter is

connected from VOUT to switching node (SW). With

the bidirectional architecture, the converter could be

configured as either buck to charge battery or boost

to discharge battery. With switching charger and

discharger, the higher charge current and higher

conversion efficiency are achieved.

Modes of Operation

ACT2813/ACT2813C has 3 operation modes:

charge mode, boost mode and high-impedance

(HZ) mode. In charge mode, the input current limit

Q1 is enabled and Q2 and Q3 operate as a buck

converter to charge battery. In boost mode, Q2 and

Q3 operate as boost converter to step battery

voltage up to +5V at VOUT, and the current limit

switch Q1 is turned off, and the reverse current from

VOUT to VIN is blocked. In HZ mode, all the

switches are turned off and the drainage current

from battery is very low. ACT2813 system operation

flow chart as shown in Figure 1 and ACT2813C

system operation flow chart as shown in Figure 2.

Any transitions between boost mode and charge

mode go through HZ mode by turning off all the

switches Q1-Q3 into HZ mode for 2 seconds before

enabling the other mode.

The modes are determined by HZ pin and VIN pin

as shown in the table 1. A valid VIN voltage forces

ACT2813/ACT2813C into charge mode. Boost

mode is enabled if HZ pin is pulled low and VIN is

invalid or not present. When HZ=0, if PB is pulled

low for more than 30ms, boost converter is enabled.

For ACT2813, a running boost is disabled if one of

the following conditions is met:

Boost converter output current is below light

load threshold for 16 seconds.

2. Battery voltage falls below the boost cut-off

threshold.

3. After PB is released, if PB is pulled low for more

than 1.5 seconds.

Flashlight

ACT2813C has an flashlight function. Once PB is

pressed for more than 3 seconds, the flashlight is

switched on. The driver will deliver up to 50mA

current to the flashlight. During flashlight on, if PB is

pressed for 3 seconds, flashlight will be switched

off.

Table 1: Mode Selection

HZ PIN

VIN Valid

Mode

Boost

Charge

Figure 1:

ACT2813 System Operation Flow Chart

ACT2813 数据表(PDF) 9 Page - Active-Semi, Inc

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