LTC4012 datasheet(28/52 Pages) AD

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LTC4162-L

Rev A

For more information www.analog.com

OPERATION

Low Power Ship Mode

The LTC4162 can reduce its already low battery-only

standby current to about 2.8µA in a special mode designed

for shipment and storage. Ship mode is armed by setting

arm_ship_mode to arm. It does not take effect, however,

until the input voltage VIN drops below approximately 1V.

Uponreturnoftheinputvoltageaboveapproximately1Vthe

LTC4162wakesfromshipmode.Thedecisiontoremainout

of ship mode is latched once the internal voltage reference

is re-biased and VIN is detected as having reached about

4.2V (vin_gt_4p2v). In ship mode, the VCC2P5 2.5V logic

LDO and the INTVCC 5V system LDO are deactivated and,

along with them, all logic and communications with the

I2C port. Consequently, no settings or state information

will persist through a ship mode cycle.

Oscillator Synchronization

The SYNC pin is available to synchronize the switching

battery charger to an external clock for optimum noise

immunity. To use the SYNC pin, use the RT pin to set

the frequency of the internal oscillator to the frequency

expected by the SYNC signal. If no signal is present at

SYNC, the internal oscillator will run normally. If a signal

within the required tolerance range appears at SYNC, the

internal oscillator will detect it and synchronize with it. To

avoid a long or short cycle, synchronization won't occur

until the internal oscillator and external signals coincide.

Therefore, synchronization may take several thousand

cycles (milliseconds) to occur. If SYNC is not used, it

should just be grounded.

Under Voltage Lockout Circuits/suspend_charger/

System Faults

Various supply monitor circuits, as well as suspend_char-

ger, can disable charging. If the voltage at VIN falls below

BATSENS+ (i.e. not vin_gt_vbat), or thermal_shutdown

(die temperature above ~150°C), no_rt resistor, not

intvcc_gt_2p8v, not vin_gt_4p2v, or a CELLS0/1 pins

cell_count_err, the LTC4162 suspends charging and

reports charger_suspended. In the absence of any of the

above fault conditions, charging is re-enabled when VIN

rises VIN_DUVLO above the BATSENS+ voltage.

LTC4162 Lithium-Ion/Polymer Variants

The LTC4162-LAD is fully programmable and follows the

descriptions given thus far but there are three other non-

programmable voltage variants available as well. Each of

thesefourversionsisavailablewithandwithoutsolarpanel

Maximum Power Tracking enabled by default.

The LTC4162 Lithium-Ion/Polymer variants are:

LTC4162-L40

LTC4162-L41

LTC4162-L42

LTC4162-LAD

The LTC4162-L40, LTC4162-L41 and LTC4162-L42

JEITA values are not writable and follow the values

outlined below.

jeita_t1

0x3EF5

(0°C)

jeita_t2

0x3721

(10°C)

jeita_t3

0x1F22

(40°C)

jeita_t4

0x1BC8

(45°C)

jeita_t5

0x18B5

(50°C)

jeita_t6

0x136A

(60°C)

VARIANT

REGION1

REGION2

REGION3

REGION4

REGION5

REGION6

REGION7

CHARGE CURRENT

CHARGER

OFF

16mV/RSNSB

32mV/RSNSB

16mV/RSNSB

CHARGER

OFF

LTC4162-L40

4.0V

3.9V

3.95V

LTC4162-L41

4.1V

4.0V

4.05V

LTC4162-L42

4.2V

4.1V

4.05V

LTC4162-LAD

4.2V

4.1V

4.05V

LTC4012 Datasheet(PDF) 28 Page - Analog Devices

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