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参数资料
| 型号： | MAX4987AEETA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC CTLR OVP USB ESD PROT 8TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 过压保护控制器 |
| 应用： | 手机、媒体播放器 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN-EP（2x3） |
| 包装： | 标准包装 |
| 其它名称： | MAX4987AEETA+TDKR |
MAX4987AE/MAX4987BE
Detailed Description
The MAX4987AE/MAX4987BE are overvoltage protec-
tion devices with integrated ESD protection for USB
data lines. These devices feature a low RON internal
FET and protect low-voltage systems against voltage
faults up to +28V. If the input voltage exceeds the over-
voltage threshold, the internal nFET switch is turned off
to prevent damage to the protected components. The
30ms debounce time prevents false turn-on of the inter-
nal nFET switch during startup. An open-drain active-
low logic output is available to signal that a successful
power-up has occurred.
Device Operation
The MAX4987AE/MAX4987BE have an internal oscilla-
tor and charge pump that control the turn-on of the
internal nFET switch. The internal oscillator controls the
timers that enable the turn-on of the charge pump and
controls the state of the open-drain
ACOK output. If VIN
< VUVLO or if VIN > VOVLO, the internal oscillator
remains off, thus disabling the charge pump. If VUVLO <
VIN < VOVLO, the internal charge pump is enabled. The
charge-pump startup, after a 30ms internal delay, turns
on the internal nFET switch and asserts
ACOK (see
Figure 1). At any time, if VIN drops below VUVLO or rises
above VOVLO, ACOK is pulled high and the charge
pump is disabled.
Internal nFET Switch
The MAX4987AE/MAX4987BE incorporate an internal
nFET switch with a 100mΩ (typ) on-resistance. The
nFET switch is internally driven by a charge pump that
generates a voltage above the input voltage. The
MAX4987AE/MAX4987BE is equipped with a 1.5A (min)
current-limit protection that turns off the nFET switch
within 5s (typ) during an overcurrent fault condition.
Autoretry
The MAX4987AE/MAX4987BE have an overcurrent
autoretry function that turns on the nFET switch again
after a 30ms (typ) retry time (see Figure 2). If the faulty
load condition is still present after the blanking time, the
switch turns off again and the cycle is repeated. The fast
turn-off time and 30ms retry time result in a very low duty
cycle in order to keep power consumption low. If the
faulty load condition is not present, the switch remains on.
Undervoltage Lockout (UVLO)
The MAX4987AE has a 2.55V undervoltage-lockout
threshold (UVLO), while the MAX4987BE has a 4.15V
UVLO threshold. When VIN is less than VUVLO, ACOK is
high impedance.
Overvoltage-Protection Controller
with USB ESD Protection
6
_______________________________________________________________________________________
UVLO
OVLO
tINDBC
tON
IN
OUT
ACOK
tINDBC
tOFF
90% VOUT
tINDBC
tOFF
10% VOUT
Figure 1. MAX4987AE/MAX4987BE Timing Diagram
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4987AETA+T | 功能描述:电源开关 IC - 配电 Overvoltage-Protect Controller RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MAX4989ETD+T | 功能描述:电源开关 IC - USB USB 2.0 2 of 4 Crosspoint Switch RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX4989EVKIT+ | 功能描述:交换机 IC 开发工具 MAX4989 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:USB Power Switches 工具用于评估:MAX4984E 工作电源电压:2.8 V to 5.5 V |
| MAX498CWI | 功能描述:多路器开关 IC RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| MAX498CWI+ | 功能描述:多路器开关 IC RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
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