LTC4012 datasheet(27/52 Pages) AD

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LTC4162-L

Rev A

For more information www.analog.com

OPERATION

terminationfeaturescannotbedisabled.Bothofthecharge

timers will be paused in ntc_pause.

The LTC4162 can optionally be configured to generate an

interruptatC/xterminationbysettingen_c_over_x_term_

alert. Timer termination alerts can also be set with either

en_timer_term_alert for the constant_voltage timer or

en_max_charge_time_alert for max_charge_time_fault.

c_over_x_term, timer_term and max_charge_time_fault

determine what caused the SMBALERT. The LTC4162

terminates charging by disabling the switching charger

which makes the SW node high impedance.

Automatic Recharge

After a normal termination, the charger will remain off. If

the portable product remains in this state long enough,

the battery will eventually self discharge. To ensure that

the battery is always topped off, a new charge cycle will

automatically begin when the battery voltage falls below

approximately 97.5% of the programmed charge voltage.

The termination safety timers, tcvtimer and tchargetimer,

will reset back to zero. A new charge cycle will also be initi-

atedifinputpoweriscycledorifthechargerismomentarily

disabled (e.g. suspend_charger set to 1, then back to 0).

4162L F02

vin_gt_vbat = 0

+vin_gt_4p2v = 0

+thermal_shutdown = 1

+suspend_charger = 1

+cell_count_err = 1

+no_rt = 1

CHARGER

SUSPENDED

BATTERY

DETECTION

CONSTANT CURRENT/CONSTANT VOLTAGE

CHARGING

NTC

PAUSE

30-SECOND DELAY

BATTERY DETECTION FAILED FAULT

BATTERY SHORTED FAULT

BATTERY MISSING FAULT

PRE-CHARGE

vbat < 2.85V

vbat > 2.9V

CONSTANT VOLTAGE

TIMER TERMINATION

tcvtimer > max_cv_time

AND max_cv_time ≠ 0

chargetimer

> max_charge_time

vbat < 97.5%VCHARGE

MAXIMUM CHARGE

TIME FAULT

vbat < 35%VCHARGE

CONSTANT VOLTAGE

C/x TERMINATION

charge_status = constant_voltage

AND ibat < c_over_x_threshold

vbat < 97.5%VCHARGE

vbat < 2.85V

vbat ≥ 2.85V

jeita_t1 < thermistor_voltage < jeita_t6

jeita_t1 > thermistor_voltage > jeita_t6

thermistor_voltage > open_thermistor

Figure 2. Battery Charging State Diagram

LTC4012 Datasheet(PDF) 27 Page - Analog Devices

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