MP2624GL datasheet(21/45 Pages) MPS

21 / 45 page

MP2624 – 4.5A SW CHARGER W/ I2C CONTROL, NVDC POWER PATH, USB OTG

MP2624 Rev.1.0

www.MonolithicPower.com

4/9/2018

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

absolute temperature T2, and β is a constant,

which depends on the material of the thermistor.

charge

mode,

the

MP2624

monitors

continuously

the

battery’s

temperature

measuring the voltage at NTC. This voltage is

determined by the resistive divider whose ratio is

produced by the different resistances of the NTC

thermistor

under

the

different

ambient

temperatures of the battery.

(0DegC)

(10DegC)

(45DegC)

(50DegC)

(60DegC)

Maximum Charge Current 1C

0.5C

Maximum Charge Voltage : 4.25V

(4.2V Typical)

4.15V Maximum

4.10V Maximum

Cool

Normal

Warm

Hot

Cold

Figure 7: NTC Window

MP2624 sets internally a pre-determined upper

and lower bound of the range. If the voltage at

NTC goes out of this range, which means the

temperature is outside the safe operating limit,

the charging is ceased unless the operating

temperature returns to a safe range.

To satisfy the JEITA requirement, the MP2624

monitors four temperature thresholds: the cold

battery threshold (TNTC<0ºC), the cool battery

threshold (0ºC<TNTC<10ºC), the warm battery

threshold (45ºC<TNTC<60ºC), and the hot battery

threshold

(TNTC>60ºC). For a given NTC

thermistor, these temperatures correspond to the

VCOLD, VCOOL, VWARM, and VHOT. When VNTC < VHOT

or VNTC > VCOLD, the charging is suspended, and

the

timers

are

suspended.

When

VHOT < VNTC < VWARM, the charge-full voltage

(VBATT_FULL) is reduced by 150mV compared to

the

programmable

threshold.

When

VCOOL < VNTC < VCOLD, the charging current is

reduced to half of the programmable charge

current. Figure 7 shows the JEITA control.

Separate

Pull-Up

VNTC

for

NTC

Protection

As shown in Figure 8, a separate pull-up VNTC is

designed as the internal pull-up terminal of the

resistive divider for the NTC comparator. Both the

reference divider and the feedback divider are

connected together to VNTC. The VNTC is

connected to VREF via an internal switch (in

charge mode only).

NTC

VNTC

RNTC

Hot

Cold

Cool

Warm

NTC

Protection

Charge/

Discharge?

VREF

RT1

RT2

Figure 8: NTC Protection Circuit

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