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參數(shù)資料
| 型號(hào)： | P95020ZLLGI8 |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA124 |
| 封裝： | LLGA-124 |
| 文件頁數(shù)： | 95/137頁 |
| 文件大?。?/td> | 3533K |
| 代理商： | P95020ZLLGI8 |
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P95020 / Preliminary Datasheet
Revision 0.7.10
60
2010 Integrated Device Technology, Inc.
VSYS. When an external P-channel MOSFET transistor is present, the CHRG_GATE pin of P95020 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.
3.8
CHARGER - CHARGER/DISCHARGER
The system includes a constant-current/constant-volatge battery charger with automatic recharge, automatic termination
by termination current and safety timer, low voltage trickle charging, bad cell detection and thermistor sensor input for out
of temperature charge pausing.
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 sets the battery charge current to recover charge
current (7 step 25mA/step programmable by Application Setting Register). If the low voltage persists for more than
hour, the battery charger automatically terminates and indicates via 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 Wall 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 definition section for the details.
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
begines a full charge cycle. If the VBAT pin is above 3.9V, the charger enters standby mode and does not begine 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 times
the value of R25. For Vishay
“Curve 1” this resistance, 32.5k, corresponds to approximately 0°C. Grounding the NTC pin
disables the NTC charge pausing function.
There is also a battery-discharge feature: when the battery is full and battery temperature go beyond 60°C, the NTC
thermistor drops to 0.25 times the value of R25. The charger can discharge the battery to 3.9V for safety
The VNTC pin output is dynamically enabled to save power. The NTC measurement is triggered every 5 seconds. Each
measurement takes 16ms.
3.9
CHARGER - THERMAL MONITORING
A thermal sensor is used in charging control, An internal thermal feedback loop reduces the charge current if the die
temperature attempt to rise above the preset value of approximately 120°C. This feature protects the charger from
excessive temperature and allows the pushing of the limits of the power handling capability of a given circuit board without
the risk of damagingThis thermal sensor is not used for system level die-temperature detection.
3.10 CHARGER - POWER ON RESET
A Power-On reset circuit will generate a reset when the VSYS power goes from low to high. The signal is used to reset all
the logic powered directly or indirectly by VSYS.
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