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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)： | 136/169頁 |
| 文件大?。?/td> | 4297K |
| 代理商： | P95020NQG8 |
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IDTP95020
Product Datasheet
September 2, 2011 Revision 1.3 Final
69
2011 Integrated Device Technology, Inc.
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 goes beyond 60°C, the
NTC thermistor drops to 0.25 times the value of R25(10k
ohm). The charger will discharge the battery to 3.9V for
safety. The NTC thermistor drops to 0.25xR25 equal to 20%
VNTC.
The VNTC pin output is dynamically enabled to save
power. The NTC measurement is triggered every 5
seconds. Each measurement takes 16ms.
Charger – Thermal Monitoring
A thermal sensor is used for charging control. An internal
thermal feedback loop reduces the charge current if the
die temperature rises above the preset value of
approximately 120°C. This feature protects the charger
from excessive temperature and allows optimizing the
power handling capability of a given circuit board without
the risk of damage. This thermal sensor is not used for
system level die-temperature detection.
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.
Pre-Regulator Buck – Application
Figure 15 Pre-Regulator Application Diagram
Input Capacitor
The input capacitor should be located as close as
physically to the input power pin (CHRG_INPUT1/2) and
power ground (CHRG_GND1/2). Ceramic capacitors are
recommended for their higher current operation and small
profile. Also, ceramic capacitors are inherently capable to
withstand input current surges from low impedance
sources such as batteries used in portable devices than
are tantalum capacitors. Typically, 10V or 16V rated
capacitors are required. See Table 108 for recommended
external components.
Pre-Regulator Output Capacitors
For proper load voltage regulation and operational stability,
a capacitor is required on the output of buck. The output
capacitor connection to the ground pin should be made as
directly as practically possible for maximum device
performance. Since the buck has been designed to
function with very low ESR capacitors, a ceramic capacitor
is
recommended
for
best
performance.
The
CHRG_SYSVCC1/2 (VSYS) output should also have
additional Capacitance to supply the rest of the system,
several 22 F values are recommended.
Charger Output Capacitor
The charger output (VBAT) only requires a 1μF ceramic
capacitor on the CHRG_BAT1/2 pins to maintain circuit
stability. This value should be increased to 10μF or more if
the battery connection is made any distance from the
charger output.
Inductor Selection
Inductor manufacturer’s specifications list both the
inductor DC current rating, which is a thermal limitation,
and the peak current rating, which is determined by the
saturation characteristics. The inductor should not show
any appreciable saturation under normal load conditions.
Some inductors may meet the peak and average current
ratings yet result in excessive losses due to a high DCR.
Always consider the losses associated with the DCR and
its effect on the total converter efficiency when selecting
an inductor.
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