MP2605 MPS, MP2605 Datasheet - Page 10

• Manufacturer Part Number: MP2605
• Description: 1A Li-Ion/Li-Polymer Battery Charger
• Manufacturer: MPS

The recommended resistance for programming
the charge current is 2.3kΩ<R
open-drain pin
charging status. When the battery full condition
is met or any other condition prevents the
charger from charging,
floating pin.
Negative Thermal Coefficient (NTC) Thermistor
The MP2605 has a built-in NTC resistance
window comparator. If configured as the typical
application circuit as indicated in Figure 1, the
MP2605 will cease charging if R
R
temperature range of 0°C to 50°C for the
TH11-4H104F NTC resistor.
MP2605 Rev. 0.94
1/25/2010
NTC
>376.6kΩ. This represents a valid charging
Figure 3—Charge Current vs. 1/R
1000
900
800
700
600
500
400
300
200
0
Charge Current vs.
1/R
MP2605 – 28V, 1A LINEAR BATTERY CHARGER WITH TRICKLE CHARGE AND TIMER
0.1
CHG
Resistance
CHG
0.2
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
0.3 0.4
is used to indicate
CHG
0.5
will become a
CHG
NTC
0.6 0.7
<11kΩ. The
<32.3kΩ or
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CHG
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Timer Operation
The TMR pin is used to set the internal
oscillator frequency,
on-chip timer will start to count down after initial
power-up or every time it is enabled. This timer
will limit the max trickle-charge time to 32768
internal oscillating cycles. If the charger stays in
trickle mode for longer than 32768 cycles, it will
be terminated and a fault will be set by floating
be re-initiated only by recycling the power
supply
successfully goes through trickle charge within
the allowed time limit, it will start CC charging
and then CV charging. If the total charge time
exceeds 262144 cycles and the battery full has
not
terminated and a fault will also be set by
flashing
oscillation frequency. This function prevents
charging a dead battery for prolonged duration.
The timer function can be disabled by shorting
TMR to ground.
Thermal Protection
The MP2605 has proprietary thermal protection
to prevent the IC from overheating. When in
thermal protection mode, the average charge
current will be reduced to prevent the IC from
overheating. Operating in thermal protection
mode will slow down the charging process.
Lowering the input voltage and enhancing
thermal dissipation to the environment can
effectively prevent the IC from going into
thermal protection mode.
CHG
been
pin. After fault reporting, the charger can
CHG
or
qualified,
SHDN
pin at the rate of half the internal
F
signal.
OSC
the
=
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11Hz
charger
If
×
the
C
µ
TMR
F
will
charger
. The
be
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