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参数资料
| 型号： | MAX4920BETD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/19页 |
| 文件大小： | 0K |
| 描述： | IC CTLR OVP/OCP BATT PWR 14-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 过压和过流控制器 |
| 应用： | 手机，数码相机，媒体播放器 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
Additional Applications Information
Adapter Application
Figures 11 and 12 depict the MAX4919B/MAX4920B
being utilized in an application where the AC adapter
supplies the input voltage and the car adapter is not
plugged in. In this case, when the AC adapter (5V) is
plugged in, the voltage at IN initially makes sure that a
negative voltage is not present.
If VIN remains above the UVLO and below the OVLO
ranges for more than 25ms (debouncer), the n-channel
MOSFET (N1) turns on and after 25ms, ACOK asserts
low, then a one-shot timer starts that turns P2 on for 1.2s.
During this duration, the P needs to issue a PWR_HOLD
to keep P2 on before the one-shot period expires. The
adapter then powers the charger to charge the battery
and the battery supports the load.
Reverse-Polarity Protection
Figure 11 shows an application where the external
p-channel MOSFET is added for reverse-polarity protec-
tion. The reverse-polarity protection works by turning off
the p-channel MOSFET when the adapter voltage is
below ground. The p-channel MOSFET only turns off if
the voltage at IN is less than the threshold voltage of the
p-channel MOSFET. Due to the body diode leakage
path through the external n-channel MOSFET, the
reverse-polarity protection operation requires a reverse
current-limited load. Figure 11 shows a battery charger
as the load connected to the source of n-channel MOS-
FET. If the voltage at the load connection (source of the
n-channel MOSFET) is greater than the drop across the
n-channel MOSFET’s body diode plus the p-channel
MOSFET threshold voltage, then the p-channel MOSFET
remains on if the adapter voltage is below ground. If the
load has reverse-current protection, the voltage at the
load pulls down and the p-channel MOSFET turns off
limiting reverse current. If the load allows a large reverse
current, then this current flows out of the adapter input
and the reverse-polarity protection is defeated.
Car-Kit Application
Figures 13 and 14 illustrate the MAX4921B being uti-
lized when the car-kit adapter, with built-in charger, is
plugged in and connected directly to the battery.
HP_PWR goes through a 25ms debounce period and
then a 1.2s one-shot is issued.
During this one-shot period, the P needs to issue a
PWR_HOLD to keep P2 on before the one-shot period
expires. The car kit then charges the battery and the
battery supports the load. Note that the reverse-polarity
protection p-channel MOSFET cannot be used in this
application due to the direct connection of the battery
to the source of the n-channel MOSFET.
MAX4919B/MAX4920B/MAX4921B
Battery Power-Up Logic with Overvoltage
and Overcurrent Protection
______________________________________________________________________________________
13
t1SHHP
tHPDBC
HP_PWR
PWR_HOLD
OFF
ON
P2 STATUS
HP_PWR
ONE-SHOT
Figure 8. MAX4919B/MAX4920B/MAX4921B Power_Hold
Waveform When Voltage IN is Not Present
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4921BETD+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX4921BETD+T | 功能描述:电池管理 Battery Power-Up Logic RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX4924ELT+T | 功能描述:开关变换器、稳压器与控制器 Overvoltage Protector RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MAX4925ELT+ | 制造商:Maxim Integrated Products 功能描述:OVP PROTECTOR WITH EXTERNAL PFET - Bulk |
| MAX4925ELT+T | 功能描述:开关变换器、稳压器与控制器 Overvoltage Protector RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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