MP2607 MPS, MP2607 Datasheet - Page 12

• Manufacturer Part Number: MP2607
• Description: Li + Linear Charger Withsystem Power Path Management
• Manufacturer: MPS

Power path management allows use of lower
current limited sources while still provides
continuous system supply and optimal battery
charging at the same time.
USB Mode Input Switch Current Limit
When IN is connected to an USB port, the
switch between IN and SYS has a built-in
current limit that is set by an internal resistor
with typical value of 450mA. Post-package
trimming keeps the variation within +-5%.
Charging Current Thermal Fold-back
MP2607 has internal monitoring circuit that will
reduce the charging current if the chip junction
temperature reaches 120°C. This prevents
overheat of the chip and avoids unnecessary
thermal shutdown.
Floating Charging Voltage
The floating voltage for the constant voltage
regulation phase is 4.2V. It has ±0.75%
accuracy over the ambient temperature range
of -10°C to +70°C.
Auto Recharge
MP2607 automatically recharge the battery if
BATT pin voltage falls below a predetermined
threshold V
always stay at full or near full condition,
increasing the battery life.
Status Indication output
outputs which should be connected to pull-up
resistors to SYS output or desired supply rail.
Their output logic level combinations are used
to indicate 4 status of the charger:
MP2607 Rev. 1.0
1/5/2011
STAT1 and STAT1 are two open-drain NMOS
Figure 3—Power Path Management for USB
BATT voltage
SYS voltage
Charging
current
USB port
current
RECHG
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
. This allows the battery to
Mode
supplements load
SYS load
current
Battery
MP2607 – LI-ION CHARGER WITH POWER PATH MANAGEMENT
© 2011 MPS. All Rights Reserved.
www.MonolithicPower.com
Regardless of the charger status, however, the
charger does not turn off as long as a valid
input power source is attached.
NTC Temperature Sensor
The NTC pin allows MP2607 to sense the
ambient
Thermal Coefficient (NTC) thermistor usually
available in the battery pack to ensure a safe
operating environment of the battery. A resistor
with appropriate value should be connected
from VIN to NTC and the NTC resistor parallel
connected a regular resistor is connected form
NTC pin to ground. The voltage on NTC pin is
determined by the resistor divider whose divide
ratio depends on the ambient temperature.
MP2607 internally sets a pre-determined upper
and lower bound of the divide ratio. If NTC pin
voltage falls out of this range which means the
temperature is outside the safe operating
range, MP2607 will stop charging and report it
on status pins. Charging will automatically
resume after the temperature falls back into the
safe range.
Enable
Enable of MP2607 is controlled by pulling CEB
pin below 0.3V. Pulling CEB pin above 2V will
put MP2607 in sleep mode, which disables
power path management and battery charger.
In sleep mode, the N-channel switch between
BATT and SYS is fully on to maintain system
supply. Battery under-voltage and current limit
are kept alive to provide safeguard.
Charging
End of Charge
Charge Suspended (due
to Battery supplement
mode or NTC out of
range)
Fault/Disable
time-out,
thermal
EN
>2V, or no VIN
Charger Status
temperature
shutdown),
(due
internal
to
using
Low
Low
High
High
STAT1
the
Low
High
Low
High
STAT2
Negative
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