參數(shù)資料
型號： P95020NQG8
廠商： INTEGRATED DEVICE TECHNOLOGY INC
元件分類： 電源管理
英文描述： 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC132
封裝： 10 X 10 MM, 0.85 MM HEIGHT, QFN-132
文件頁數(shù)： 135/169頁
文件大小： 4297K
代理商： P95020NQG8
IDTP95020
Product Datasheet
September 2, 2011 Revision 1.3 Final
68
2011 Integrated Device Technology, Inc.
Charger – Ideal Diode from
VBAT to VSYS
The charger has an internal ideal diode as well as a
controller for an optional external ideal diode. The ideal
diode controller is always on and will respond quickly
whenever VSYS drops below VBAT. If the load current
increases beyond the power allowed from the switching
regulator, additional power will be pulled from the battery
via the ideal diode. Furthermore, if power to VBUS (USB or
AC adaptor power) is removed, then all of the application
power will be provided by the battery via the ideal diode.
The ideal diode consists of a precision amplifier that
enables a large on-chip P-channel MOSFET transistor
whenever the voltage at VSYS is approximately 15mV
below the voltage at VBAT. The resistance of the internal
ideal diode is approximately 180m
Ω
. If this is sufficient for
the application, then no external components are
necessary. However, if more current is needed, an
external P-channel MOSFET transistor can be added from
VBAT to VSYS. When an external P-channel MOSFET
transistor is present, the CHRG_GATE pin of the
IDTP95020 drives its gate for automatic ideal diode
control. The source of the external P-channel MOSFET
should be connected to VSYS and the drain should be
connected to VBAT.
Charger – Charger / Discharger
The system includes a constant-current/constant-voltage
battery charger with automatic recharge, automatic
termination by termination current and safety timer. Also
included is low voltage trickle charging, bad cell detection
and a thermistor sensor input for battery temperature
range charge reduction.
Battery Preconditioning
When a battery charge cycle begins, the battery charger
first determines if the battery is deeply discharged. If the
battery voltage is below VTRKL, typically 2.8V, an automatic
trickle charge feature steps the battery charge current to
increase the voltage level (7 steps at 25mA/step
programmable by the Application Setting Register). If the
low voltage level persists for more than hour, the
battery charger automatically terminates and indicates via
the battery fault flag in the Status 1 Register that the
battery is defective. Once the battery voltage is above
VTRKL, the battery charger begins charging in full power
constant current mode. The current delivered to the
battery will try to reach ICHG (step 100mA, 1X ~15X
programmable by Charging Configuration Register), the
battery charger may or may not be able to charge at the
full programmed rate. The external load will always be
prioritized over the battery charge current. The USB (or
AC adapter) current limit programming will always be
observed.
Charge Termination
When the voltage on the battery reaches the pre-
programmed float voltage (4.1V or 4.2V), the battery
charger enters constant voltage mode and the charge
current will decrease as the battery becomes fully charged.
The charger offers several methods to terminate a charge
cycle by setting the Charging Termination Control Register
bits[1:0]. Refer to the register address definition section.
Intelligent Start and Automatic Recharge
When the charger is initially powered on, the charger
checks the battery voltage. If the VBAT pin is below the
recharge threshold of 3.9V (which corresponds to
approximately 50-60% battery capacity), the charger
enters charge mode and begins a full charge cycle. If the
VBAT pin is above 3.9V, the charger enters standby mode
and does not begin charging. This feature reduces
unnecessary charge cycle thus prolongs battery life. When
the charger is in standby mode, the charger continuously
monitors the voltage on the VBAT pin. When the voltage
drops below 3.9V and the temperature below 40°C, the
charge cycle is automatically restarted and the safety
timer and termination timer (if time termination is used) is
reset to 50% of the programmed time. This feature
eliminates the need for periodic charge cycle initiations
and ensures the battery is always fully charged.
Battery Temperature Monitor
The battery temperature is measured by placing a
negative temperature coefficient (NTC) thermistor close to
the battery pack. To use this feature, connect the NTC
thermistor, RNTC, between the NTC and ground and a
resistor, RNOM, from VNTC to the NTC pin. RNOM should be
a 1% resistor with a value equal to the value of the chosen
NTC thermistor at 25°C(R25). For applications requiring
greater than 750mA of charging current, a 10k NTC
thermistor is recommended. The charger will pause
charging when the NTC thermistor drops to 0.54 times the
value of R25 or approximately 5.4k. For a Vishay “Curve 1”
thermistor, this corresponds to approximately 40°C. As
the temperature drops, the resistance of the NTC
thermistor rises. The charger will also pause charging
when the value of the NTC thermistor increase to 3.25
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