MP2612 MPS, MP2612 Datasheet - Page 13

• Manufacturer Part Number: MP2612
• Description: 2a,24v Input, 600khz 2/3-cell Switching Li-ion Battery Charger
• Manufacturer: MPS

The total charge time is:
Negative
Thermistor
The MP2612 has a built-in NTC resistance
window comparator, which allows MP2612 to
sense the battery temperature via the thermistor
packed internally in the battery pack to ensure a
safe operating environment of the battery. A
resistor
connected from VREF33 to NTC pin and the
thermistor is connected from NTC pin to GND.
The voltage on NTC pin is determined by the
resistor divider whose divide ratio depends on
the battery temperature. When the voltage of pin
NTC is out of NTC window range, MP2612 will
stop the charging. The charger will restart if the
temperature goes back into NTC window range.
MP2612 Rev. 0.92
11/23/2010
with
T
T
TICKLE_TMR
TOTAL_TMR
MP2612 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
Thermal
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
appropriate
=
=
30mins
3hours
Coefficient
value
×
×
0.1uF
C
0.1uF
C
TMR
TMR
should
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www.MonolithicPower.com
(NTC)
be
Power Path Management
Using MP8110 together with MP2612 can
implement a switching charger circuit with power
path management function, which realizes the
current sharing of the charger and system load
(Figure 2). In another word, MP8110 senses the
system current and feeds back to MP2612 and
MP2612 reduces charge current according to the
increase of the system current.
However, after the charge current decrease to 0,
the system current can only be limited by the
adapter.
The system current is satisfied first and always. It
chooses the adapter as its power source when
the adapter plugs in, and the battery is the
backup power source when the adapter is
removed.
Figure 4 to 7 shows the charge profile, operation
waveform
and
flow
chart,
respectively.
13