ACT5880 datasheet(79/87 Pages) ACTIVE-SEMI

79 / 87 page

ACT5880

Rev 2, 03-Sep-13

- 79 -

www.active-semi.com

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Figure 16:

The Battery Installation Detection Circuit.

Refer to Figure 16, the RID is known as battery

identification resistor in many commodity battery

pack designs, which is also used to identify the

battery model for the system. The resistance of RID

could be specified by ordering the battery pack, or

be whatever the commodity battery packs have, for

examples, the Nokia BLB-2 has a 68kΩ resistor and

the Nokia BLC-2 has a 75kΩ resistor. The RIDUP is

recommended to pull up to CHGIN, whose

resistance is derived from the thresholds and the

suitable charging voltage range.

The battery installed detection works only when

there is suitable charging voltage applied on the

CHGIN, no power loss occurs if not attaching onto

an external power source. When there is an

external power available at the CHGIN, the logic

level at the BATID decides if to operate as a normal

CCCV charger or to operate in LDO mode, in which

the charger regulator works like a LDO for

outputting the battery regulation voltage. When the

voltage the CHGIN is higher than the "No Battery

Installation Level" specified in the electrical

characteristics table, the charger is in LDO mode,

the maximum charge current still works to limit the

maximum output current.

When the battery does not have an ID resistor,

ground the BATID with a resistor to force the logic

level is equal to battery installed for normal charge

operation; Or connect it to an I/O of the system to

allow the system to control the logic level.

CC/CV Charging Profile

The core of the charger is a state machine which

manages the state transitions for the CC/CV

charging with a precondition state. The state

machine waits for the available condition for

operation. If the input power is available and battery

is detected, it monitors either the voltage at VBAT

or the current through the charge path, and

regulates either the current or the voltage, as the

profile showed in Figure 17. The profile is showed

in time plane with typical I and V change to time

curves. The top-off portion of curves, which is in

shorter period comparing to the fast charge period,

are plotted with expended time scale for showing in

detail.

Summary of Key Specifications

Table 10:

The Key Specification of the Charger Block.

Charge Current Sharing

The charge current may go into the battery or the

load, decided by their dynamic impedances. During

Top-off state or floating, the fast voltage regulation

loop puts most current into the charger path until

the charge path current reaches the fast charge

current limit, reduces the AC current into battery.

This prevents the battery from aging caused by

continuous passing AC current.

Thermal Regulation

The ACT5880 has an internal thermal feedback

loop that reduces the charge current when

necessary to ensure the die temperature does not

BATID

RID

RIDUP

ACT5880

Battery

Assembly

CHGIN

PARAMETER

VOLUME

TYPE

Battery Regulation

Voltage (V)

4.10 to 4.40

Programmable

Fast Charge Current

(mA)

90 to 1000

Programmable

End-of-Charge Current

Residual Ratio

10.00%

Fixed

Total Charge Time-out

(minutes)

180 to 300

Programmable

or Disabled

Pre-condition Threshold

(V)

2.8

Fixed

Pre-condition Current

(mA, or %/Fast Charge

Current)

45mA or

10%

Fixed

Pre-condition Time-out

(minutes)

40 to 80

Programmable

or disabled

Operation Voltage (V)

4.2 to 6

Fixed

UVLO Voltage (V)

3.1, 4

Programmable

Over Voltage Threshold

(V)

6.3 to 6.9

Programmable

Input Voltage Range (V)

0 to 7

Fixed

Regulation Die Temp(°C)

140 max.

Fixed

Hot Threshold, %

34.9

Fixed

Cold Threshold, %

74.8

Fixed

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