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参数资料
| 型号： | ISL54226IRUZ-T7A |
| 厂商： | Intersil |
| 文件页数： | 17/17页 |
| 文件大小： | 0K |
| 描述： | IC USB SWITCH DPST OVP 8TQFN |
| 标准包装： | 1 |
| 功能： | 开关 |
| 电路： | 2 x SPST |
| 导通状态电阻： | 17 欧姆 |
| 电压电源： | 单电源 |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 5.25 V |
| 电流 - 电源： | 45µA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-XFQFN |
| 供应商设备封装： | 8-UTQFN（1.2x1.4） |
| 包装： | 标准包装 |
| 其它名称： | ISL54226IRUZ-T7ADKR |
ISL54226
9
FN7614.1
September 12, 2013
External VDD Series Resistor to Limit IDD
Current during Negative OVP Condition
A 100 to 1k resistor in series with the VDD pin (see Figure 8)
is required to limit the IDD current draw from the system power
supply rail during a negative OVP fault event.
With a negative -5V fault voltage at both com pins, the graph in
values for supply voltages of 2.7V, 3.6V, and 5.25V. Note: With a
500 resistor the current draw is limited to around 5mA. When
the negative fault voltage is removed the IDD current will return
to it’s normal operation current of 25A to 45A.
The series resistor also provides improved ESD and latch-up
immunity. During an overvoltage transient event (such as occurs
during system level IEC 61000 ESD testing), substrate currents
can be generated in the IC that can trigger parasitic SCR
structures to turn ON, creating a low impedance path from the
VDD power supply to ground. This will result in a significant
amount of current flow in the IC, which can potentially create a
latch-up state or permanently damage the IC. The external VDD
resistor limits the current during this overstress situation and has
been found to prevent latch-up or destructive damage for many
overvoltage transient events.
Under normal operation the low microamp IDD current of the IC
produces an insignificant voltage drop across the series resistor
resulting in no impact to switch operation or performance.
CHARGER PORT DETECTION
The ISL54226 has special charger port detection circuitry that
monitors the voltage at the com pins to detect when a battery
charger has been connected into the USB port (see Figure 10).
When the battery charger is connected to the USB connector it
shorts the COM+ and COM- pins together. The shorting of the pins
is sensed by the ISL54226 IC and it pulls the COM+ and COM-
lines high and as long as the OE/ALM pin is driven low
(OE/ALM = “0”) by the P, it will drive its INT logic output “Low” to
tell the power management circuitry that a battery charger is
connected at the port and not a USB host transceiver. The power
management circuitry will then set the appropriate current level
and use the USB connector VBUS line to charge the battery.
FIGURE 8. VDD SERIES RESISTOR TO LIMIT IDD CURRENT DURING
NEGATIVE OVP AND FOR ENHANCED ESD AND LATCH-
UP IMMUNITY
D+
100 TO 1k
COM+
COM-
VSUPPLY
GND
C
PROTECTION
RESISTOR
OVP
LOGIC
D-
IDD
VDD
-5V
FAULT
VOLTAGE
OE/ALM
INT
LOW
TO
INDICATE
OVP
100k
FIGURE 9. NEGATIVE OVP IDD CURRENT vs RESISTOR VALUE vs
VSUPPLY
FIGURE 10. CHARGER PORT DETECTION
0
5
10
15
20
25
100
200
300
400
500
600
700
800
900
1k
RESISTOR ()
I DD
(mA)
VCOM+ = VCOM- = -5V
2.7V
3.6V
5.25V
D+ COM+
COM-
VSUPPLY
GND
C
LOGIC
D-
VDD
OE/ALM
INT
USB
TRANCEIVER
BATTERY
CHARGER
P
200
CHG DET
POWER
BATTERY CHARGER
CIRCUITRY
MANAGEMENT
“LOW” TO
INDICATE
CHARGER
CONNECTED
(OE/ALM = “0”)
VBUS
GND
D+
D-
DRIVEN LOW BY P
US
B
C
O
NN
EC
T
O
R
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL54226IRZEVAL1Z | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:High-Speed USB 2.0 (480Mbps) DPST Switch with Overvoltage Protection (OVP) and Dedicated Charger Port Detection |
| ISL54227 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:High-Speed USB 2.0 (480Mbps) DPST Switch with Overvoltage Protection (OVP) and Dedicated Charger Port Detection |
| ISL54227_10 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:High-Speed USB 2.0 (480Mbps) DPST Switch with Overvoltage Protection (OVP) and Dedicated Charger Port Detection |
| ISL54227IRTZ | 功能描述:IC USB SWITCH DUAL DPST 10TDFN RoHS:是 类别:集成电路 (IC) >> 接口 - 模拟开关，多路复用器，多路分解器 系列:- 其它有关文件:STG4159 View All Specifications 标准包装:5,000 系列:- 功能:开关 电路:1 x SPDT 导通状态电阻:300 毫欧 电压电源:双电源 电压 - 电源，单路/双路(±):±1.65 V ~ 4.8 V 电流 - 电源:50nA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:7-WFBGA，FCBGA 供应商设备封装:7-覆晶 包装:带卷 (TR) |
| ISL54227IRTZEVAL1Z | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:High-Speed USB 2.0 (480Mbps) DPST Switch with Overvoltage Protection (OVP) and Dedicated Charger Port Detection |
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