ADP5360ACBZ-2-R7 datasheet(22/60 Pages) AD

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ADP5360

Data Sheet

Rev. 0 | Page 22 of 60

Charge Complete

The ADP5360 charger monitors the charging current while in

constant voltage fast charge mode. When EN_TEND is low, the

current falls lower than IEND for tDG, and the charger is stopped

by turning the battery isolation FET off. The system voltage is

maintained at VSYS_REG by the linear regulator and sets the

CHG_CMPLT flag. When EN_TEND is set to high, the charging

current falls lower than IEND for another tEND, stopping the

charger and setting the CHG_CMPLT flag.

Recharge

After the detection of charge is complete, and the battery isolation

FET turns off, the ADP5360 charger still monitors the BSNS pin.

If the BSNS pin voltage falls by VRCH, the charger reactivates.

Under most circumstances, triggering the recharge threshold

results in the charger starting in fast charge mode.

Battery Charging Enable or Disable

To enable the ADP5360 charging function, set the EN_CHG bit

high or pull the ENCHG pin high. The hardware ENCHG pin is

logically OR’ed with the EN_CHG bit, Address 0x07. If the

charger is disabled, the linear regulator remains turned on and

regulatesVVSYS to VSYS_REG. The battery isolation FET turns off,

and the linear regulator provides the power for the system.

BATTERY ISOLATION FET

The ADP5360 charger features an integrated battery isolation

FET for power path control and battery protection. The battery

isolation FET isolates a deeply discharged Li-Ion cell from the

system power supply in both trickle and fast charge modes,

therefore allowing the system to be powered at all times. The

battery isolation FET maintains VSYS_REG on the VSYS pin.

When VBUS is lower than VVBUS_OK, the battery isolation FET is

in full conducting status.

The battery isolation FET supplements the battery to support

high current functions on the system power supply when VBUS

current is limited.

When the voltage on VSYS drops lower than ISOB, the battery

isolation FET enters full conducting mode.

BATTERY DETECTION

Battery Level Detection

The ADP5360 charger features a battery detection mechanism to

detect an absent battery. When the charger starts charging, it

actively sinks and sources current into ISOB and voltage vs.

time is detected. The sink phase detects a charged battery, while

source phase detects a discharged battery.

The sink phase sinks current (ISINK) from the ISOB pin and the

BSNS pin for typically 330 ms (see Figure 50). If the BSNS pin is

lower than VBATL when the 330 ms timer expires, the charger starts

the source phase. If the BSNS pin exceeds the VBATL voltage when

the 330 ms timer expires, the charger begins a new charge cycle.

The source phase sources current (ISOURCE) to the ISOB pin or

the BSNS pin for typically 330 ms. If the BSNS pin exceeds

VBATH before the 330 ms timer expires, it is assumed that no

battery is present. If the BSNS pin does not exceed VBATH when

the 330 ms timer expires, it is assumed that a battery is present,

and the charger begins a new charge cycle.

tBATOK

VBATL

ISOB

LOGIC

STATUS

OPEN

SHORT

OPEN

ISINK

SINK PHASE

tBATOK

VBATH

ISOB

LOGIC

STATUS

OPEN

SHORT

OPEN

ISOURCE

SOURCE PHASE

Figure 50. Battery Detection Sequence

ADP5360ACBZ-2-R7 Datasheet(PDF) 22 Page - Analog Devices

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