MP2696B datasheet(16/34 Pages) MPSIND

16 / 34 page

MP2696B

– SW CHARGER WITH I2C CONTROL, BOOST OUTPUT

MP2696B Rev. 1.0

MonolithicPower.com

4/16/2021

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

After

termination,

the

status

CHG_STAT is set to 11, and an INT pulse is

generated (see Figure 3).

Charge

Current

Battery Voltage

Pre-Charge

Constant Voltage Charge

CC Fast Charge

Safety Timer

VBATT_REG

VBATT_PRE

IPRE

ITERM

ICC

Figure 3: Battery Charge Profile

Automatic Recharge

When the battery is fully charged and charging

is terminated, the battery may be discharged

because of the system consumption or self-

discharge.

When

the

battery

voltage

discharged

below

the

recharge

threshold

(VBATT_REG - 200mV), the IC starts a new

charging cycle automatically if the input power

is valid. The timer restarts when the auto-

recharge cycle begins.

Safety Timer

The IC provides a safety timer to prevent

extended charging cycles due to abnormal

battery conditions. The safety timer feature can

be disabled via the I2C. The safety timer does

not operate in boost mode.

The safety timer restarts at the beginning of a

new charging cycle. The following actions

restart the safety timer:

 A new charge cycle starts

 The EN_TIMER bit is toggled

An INT pulse is generated if the safety timer

expires before charging is done. Then the

charge cycle stops, and CHG_FAULT is set to

11, which indicates that the safety timer has

expired. Unplug and re-insert VIN can clear this

fault after safety timer expires.

Input Voltage Based and Input Current

Based Power Management

The IC features both input current and input

voltage

based

power

management

monitoring the input current and input voltage

continuously.

When the input current reaches the limit set by

IINLIM, bits[2:0], the charge current tapers off to

keep the input current from increasing further.

If the preset input current limit exceeds the

adapter rating, the backup input voltage based

power management also works to prevent the

input source from being overloaded. When the

input voltage falls below the input voltage

regulation threshold set by VINMIN, bits[2:0]

due to the heavy load, the charge current is

also reduced to keep the input voltage from

dropping further.

An INT pulse is generated once the device

enters a VINPPM or INPPM condition.

Thermistor Qualification

VRNTC is driven to be equal to the VCC

voltage when the IC is in charge/boost mode.

The IC monitors the

battery’s temperature

continuously by measuring the voltage at the

NTC pin. The NTC function can be disabled by

setting EN_NTC = 0.

When NTC_STOP is set to 1, the NTC voltage

should be within the VHOT to VCOLD range for

both charge and boost operation. The IC

resumes switching when the NTC voltage

returns to the VHOT to VCOLD range.

When NTC_STOP is set to 0, the IC only

generates an interrupt signal and reports the

NTC pin status if the status changes on

NTC_FAULT, bits[2:0].

The JEITA profile is supported when the

JEITA_DIS bit is set to 0.

In the cool temperature range (VCOLD to VCOOL),

the charge current is reduced according to the

JEITA_ISET setting (see Figure 4).

Cold

Cool

Charge Current %

JEITA_ISET = 1

Warm

Hot

Temperature

100%

50%

14.3%

JEITA_ISET = 0

Figure 4: JEITA Profile (Charge Current)

In the warm temperature range (VWARM to VHOT),

the charge voltage is reduced according to the

JEITA_VSET setting (see Figure 5).

MP2696B Datasheet(PDF) 16 Page - MPS Industries, Inc.

MP2696B Datasheet(HTML) 16 Page - MPS Industries, Inc.

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