ADP5065ACBZ-1-R7 datasheet(17/40 Pages) AD

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Data Sheet

ADP5065

Rev. D | Page 17 of 40

The ADP5065 also includes a number of significant features to

optimize charging and functionality, including

•

Thermal regulation for maximum performance.

•

USB host current-limit accuracy: ±5 %.

•

Termination voltage accuracy: ±1 %.

•

Battery thermistor input with automatic charger shutdown

in the event that the battery temperature exceeds limits.

(Compliant with the JEITA Li-Ion battery charging

temperature specification.)

•

Offloads processor to manage external pin (TRK_EXT)

control to enable/disable trickle charging.

•

Direct external pin (IIN_EXT) control of 100 mA or

500 mA input current limit.

•

Optional external resistor programming input, V_WEAK_

SET, which is used for setting the VWEAK threshold. When

the battery reaches the VWEAK threshold, the ADP5065 pulls

down the SYS_EN_OK open-drain output flag. The flag can

be used to hold off system turn on until the battery is at the

minimum required level for a guaranteed system startup.

CHARGER MODES

Input Current Limit

The VINx input current limit is controlled via an internal I2C

ILIM register. The input current limit can also be controlled via

the IIN_EXT pin as outlined in Table 7. Any change in the I2C

default from 100 mA dominates over the pin setting.

Table 7. IIN_EXT Operation

IIN_EXT

Function

100 mA input current limit or I2C programmed value

500 mA input current limit or I2C programmed value

(or reprogrammed I2C value from 100 mA default)

USB Compatibility

The ADP5065 charger provides support for the following

connections through the single connector VINx pin.

The ADP5065 features a programmable input current limit to

ensure compatibility with the requirements listed in Table 8. The

current limit defaults to 100 mA to allow compatibility with a

USB host or hub that is not configured.

The I2C register default is 100 mA. An I2C write command

to the ILIM register overrides the IIN_EXT pin and the I2C

requirements.

When the input current limiting feature is used, the available

input current may be too low for the charger to meet the pro-

grammed charging current, ICHG, and the rate of charge is

reduced. In this case, the VIN_ILIM flag is set.

When connecting voltage to VINx without having the proper

voltage level on the battery side, the HV blocking part is in a

state wherein it draws only 1.3 mA (typical) of current until the

VIN has reached the VIN_OK level.

Table 8. Input Current Compatibility with Standard USB Limits

Mode

Standard USB Limit

ADP5065 Function

USB

(China

Only)

100 mA limit for stan-

dard USB host or hub

100 mA input current limit

or I2C programmed value

300 mA limit for

Chinese USB

specification

300 mA input current limit

or I2C programmed value

USB 2.0

100 mA limit for stan-

dard USB host or hub

100 mA input current limit

or I2C programmed value

500 mA limit for stan-

dard USB host or hub

500 mA input current limit

or I2C programmed value

USB 3.0

150 mA limit for

super speed USB 3.0

host or hub

150 mA input current limit

or I2C programmed value

900 mA limit for

super speed, high

speed USB host or

hub charger

900 mA input current limit

or I2C programmed value

Dedicated

Charger

1500 mA limit for

dedicated charger or

low/full speed USB

host or hub charger

1500 mA input current limit

or I2C programmed value

Trickle Charge Mode

A deeply discharged Li-Ion cell may exhibit a very low cell

voltage making it unsafe to charge the cell at high current rates. The

ADP5065 charger uses a trickle charge mode to reset the battery

pack protection circuit and lift the cell voltage to a safe level for fast

charging. A cell with a voltage below VTRK_DEAD is charged with

the trickle mode current, ITRK_DEAD. During trickle charging mode,

the CHARGER_STATUS register is set.

During trickle charging, the ISO_Sx node is regulated to

VISO_STRK by the dc-to-dc converter and the battery isolation FET

is off, which means the battery is isolated from the system

power supply.

Trickle charging can be controlled via the TRK_EXT external

pin (see Table 9). Note that any change in the I2C EN_TRK bit

dominates over the pin setting.

Table 9. TRK_EXT Operation

TRK_EXT

Function

Trickle charge enabled

Trickle charge disabled

Trickle Charge Mode Timer

The duration of trickle charge mode is monitored to ensure the

battery is revived from its deeply discharged state. If trickle

charge mode runs for longer than 60 minutes without the cell

voltage reaching VTRK_DEAD, a fault condition is assumed and

charging stops. The fault condition is asserted on the

CHARGER_STATUS register, allowing the user to initiate

the fault recovery procedure specified in the Fault Recovery

section.

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