AS3658F-BCTP datasheet(43/158 Pages) AMSCO

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AS3658

Data Sheet Confidential - Detail ed Descri ption-Power Management Functions

8.6

Battery switch SINT (Vsupply, Battery)

Figure 13. Battery Switch Diagram

The internal Battery switch enables normal operation of the System during trickle charging of a deeply discharged

battery.

The Switch provides the following functions:

Trickle charging, if VBAT is smaller than ResVolt. The current is defined in TrickleCurrent[1:0]

PMOS is switched on if VBAT is greater then ResVolt.

Constant current charging, if the external charger is in linear operation, or the USB charger is used. the current is

defined by constant_current[2:0].

Current limitation during tricklecharge, to avoid inrush current: Itrickle_Ilimit

Current limitation during Constant current charging to avoid inrush current: ICC_Ilimit

Undervoltage protection of Vsupply during trickle charge or constant current charge with linear charger. The

charging current is regulated down, if Vsupply drops below Vsupply_min

Ideal diode operation in Isolate Battery mode and disable charging mode, during charger is unplugged. This

operation is for the internal battery switch only. External battery switch is open in that mode. Regulation will start, if

the VSUPPLY voltage drops by more then VDiode below the VBAT voltage. After three milliseconds debounce time,

if no charger is recognized, the internal and external battery switch (if enabled) is closed to have a low

Ω ic

connection between VBAT and VSUPPLY.

Table 35. Battery switch parameters

Symbol

Parameter

Min

Typ

Max

Unit

Note

VSupply

Input voltage

3.0

5.5

PIN VSUP_SW1,VSUP_SW2

Itrickle_limit

Trickle current limit

400

ICC_limit

Constant current

current limit

800

Current Limit in constant current

mode (Linear charger mode or USB

charger only)

Note: applies only for the battery

switch alone

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