LTC4162EUFD-FST#PBF datasheet(26/52 Pages) AD

26 / 52 page

LTC4162-F

Rev A

For more information www.analog.com

OPERATION

−10

TEMPERATURE (°C)

3.40

3.45

3.50

3.55

3.60

3.65

4162F F01a

Default JEITA Charge Voltage Proﬁle

−10

TEMPERATURE(°C)

4162F F01b

Default JEITA Charge Current Proﬁle

Servo Voltage (V

-V

)

CSP CSN

Figure 1. Default JEITA Temperature Profile Gives A Graphical

Representation of the Seven JEITA Regions, the Six Breakpoint

and the Default Values

Battery Charger Termination and Full Charge

Indication (C/x)

The LTC4162 supports several battery charge termination

methods.

Ifenabled,amaximumelapsedchargetimetimerisstarted

at the beginning of each charge cycle and, upon achieving

constant_voltageregulation,aconstant-voltagetimermay

also be started. At the expiration of either of these tim-

ers, charging of the battery will discontinue and no more

current will be delivered. The elapsed time timer expires

when tchargetimer reaches max_charge_time and the

constant-voltage timer expires in constant_voltage when

tcvtimer reaches max_cv_time. Default max_cv_time is

3600 seconds (1 hour). To set different timer expiration

values, max_charge_time and max_cv_time are both

adjustable. The resolution of max_cv_time is 1 second/

LSB and for max_charge_time it is 1 minute/LSB.

tcvtimer can be read back to determine the cummulative

time in constant_voltage regulation. max_cv_time is a 16

bit unsigned value ranging from 0 to 65535 seconds (~18

hours). tchargetimer, the total charge time safety timer,

can be read back at any time to determine the elapsed time

sincethebeginningofthischargecycle.max_charge_time

is a 16 bit unsigned value at 1 minute per LSB ranging

from 0 to 65535 minutes (~45 days). The tchargetimer

is disabled when max_charge_time is left at its default

value of 0. To enable the tchargetimer write a non 0 value

to max_charge_time.

max_charge_time_faultindicatesthatcharginghastermi-

nated due to tchargetimer reaching max_charge_time and

timer_term indicates that charging has terminated due to

tcvtimer reaching max_cv_time. The max_charge_time_

fault will persist until either the battery voltage drops to

less than 35% of its target voltage setting, whereupon a

new charge cycle begins and the tchargetimer resets, or

a power cycle occurs resetting the entire charger state

machine. A normal termination such as timer_term

or c_over_x_term also resets tchargetimer. Finally, the

max_charge_time_fault is cleared upon abnormal condi-

tionssuchastheinputvoltagefallingbelowtheBATSENS+

pin voltage, suspend_charger or if any another system

fault occurs: not intvcc_gt_2p8v, not vin_gt_4p2v, not

vin_gt_vbat, thermal_shutdown, no_rt or cell_count_err.

Alternately, if en_c_over_x_term is set, the LTC4162 will

also terminate charging once constant_voltage is reached

and ibat has naturally dropped to the c_over_x_threshold.

The default c_over_x_threshold value of c_over_10 is a

good indication that the battery has reached a nearly full

state of charge. The c_over_x_threshold is adjustable via

the I2C port. If en_c_over_x_term is set, charging will

terminate at the first of either c_over_x_term, timer_term

ormax_charge_time_fault.Theconstant_voltagetimerter-

LTC4162EUFD-FST#PBF Datasheet(PDF) 26 Page - Analog Devices

LTC4162EUFD-FST#PBF Datasheet(HTML) 26 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

Datasheet Download

Link URL