MP2733 datasheet(24/51 Pages) MPSIND

24 / 51 page

MP2733

– 4.5A SW CHARGER WITH I2C CONTROL, NVDC POWER PATH, USB OTG

MP2733 Rev. 1.1

www.MonolithicPower.com

5/18/2023

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

NTC

Protection

VNTC

NTC

AGND

RT1

RT2

RNTC

VHOT

VWARM

VCOOL

VCOLD

Figure 7: NTC Protection Circuit

The MP2733 provides standard and JEITA

battery temperature monitoring, which can be

selected via the NTC_TYPE bit. If the standard

type is selected, and the external voltage ratio

transitions from the high temperature threshold

(VHOT) to the low temperature threshold (VCOLD),

this means that the battery temperature is out of

the cold-to-hot range. The IC suspends charging

and reports the NTC fault. Once the battery

temperature is within the cold-to-hot temperature

range again, charging resumes automatically.

If the JEITA type is selected, the MP2733

monitors four temperature thresholds:

1) Cold temperature threshold (TNTC < 0°C,

default)

2) Cool temperature threshold (0°C < TNTC <

15°C, default)

3) Warm temperature threshold (45°C < TNTC <

55°C, default)

4) Hot temperature threshold (TNTC > 55°C,

default)

For a given NTC thermistor, these temperatures

correspond to the values for VCOLD, VCOOL, VWARM,

and VHOT, respectively. These voltage thresholds

can be configured via REG16h, bits[5:0] to set

different temperature ranges.

If VNTC < VHOT or VNTC > VCOLD, charging and

timers are suspended. If VHOT < VNTC < VWARM,

then VBATT_REG is reduced by 200mV (configured

via REG16h, bit[7]). If VCOOL < VNTC < VCOLD, the

charging current is reduced to 16.7% of its set

value, which can be configured via REG16h,

bit[6]. Figure 8 shows the NTC window with

JEITA control.

Charge Current

Charge Voltage

Cold

Cool

Warm

Hot

Figure 8: NTC Window with JEITA Control

The MP2733 provides PCB over-temperature

(OT) monitoring. The PCB OT response is

selected by the NTC_OPTION bit (REG02h,

bit[1]). If this bit is set to 1, PCB over-temperature

protection (OTP) is enabled. If this bit is set to 0

(the default setting), the battery temperature

monitoring

and

corresponding

protection

features described above are utilized instead.

While monitoring OT conditions in the PCB, the

IC continuously monitors the PCB temperature

at the NTC pin. If the NTC pin

’s voltage is below

the threshold that uses VHOT, the DC/DC

converter and battery FET turn off. Operation

resumes once the NTC pin voltage returns to its

normal value.

If the NTC thermistor is removed, NTC is pulled

up to VNTC (see Figure 7). If the NTC voltage

exceeds 95% of VNTC, then the NTC thermistor

is detected to be floating. The MP2733 sends an

INT

signal

the

host,

and

the

RNTC

FLOAT_STAT bit is set to 1.

Battery Temperature Monitor in On-the-Go

(OTG) Boost Mode

In boost mode, the device monitors whether the

battery temperature is within the VCOLD and VHOT

thresholds, unless boost mode temperature

monitoring is disabled by setting EN_OTG NTC

(REG02h, bit[5]) to 0. If the temperature goes

outside of these thresholds, boost mode is

suspended. Once the temperature returns to

within these thresholds, boost mode resumes.

Charging STAT Indication

The MP2733 indicates the charging state on the

open-drain STAT pin. Table 2 shows the STAT

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