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參數(shù)資料
| 型號： | ISL54228IRUZ-T7A |
| 廠商： | Intersil |
| 文件頁數(shù)： | 3/17頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC USB SWITCH DPST OVP 8TQFN |
| 標準包裝： | 1 |
| 功能： | 開關 |
| 電路： | 2 x SPST |
| 導通狀態(tài)電阻： | 17 歐姆 |
| 電壓電源： | 單電源 |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 5.25 V |
| 電流 - 電源： | 45µA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-XFQFN |
| 供應商設備封裝： | 8-UTQFN（1.2x1.4） |
| 包裝： | 標準包裝 |
| 其它名稱： | ISL54228IRUZ-T7ADKR |
ISL54228
11
FN7628.0
July 29, 2010
In a typical application, VDD will be in the range of
2.8V to 4.3V and will be connected to the battery or
LDO of the portable media device.
LOGIC CONTROL
The state of the ISL54228 device is determined by the
voltage at the OE pin, LP pin, and the signal voltage at
the COM pins. Refer to “Truth Table” on page 2.
The OE and LP pins are internally pulled low through a
4MΩ resistor to ground and can be tri-stated or left
floating.
The ISL54228 is designed to minimize IDD current
consumption when the logic control voltage is lower than
the VDD supply voltage. With VDD = 3.6V and the OE
logic pin is at 1.4V, the part typically draws only 25A.
With VDD = 4.3V and the OE logic pin is at 2.6V, the part
typically draws only 35A. Driving the logic pin to the
VDD supply rail minimizes power consumption.
The OE and LP pin can be driven with a voltage higher
than the VDD supply voltage. It can be driven up to
5.25V with a VDD supply in the range of 2.7V to 5.25V.
Low Power Mode
If the OE pin = Logic “0”, and the LP pin = Logic “1” the
switches will turn OFF (high impedance) and the part
will be put in a low power mode. In this mode, the part
draws only 10A (max) of current across the operating
temperature range.
Normal Operation Mode
With a signal level in the range of 0V to 3.6V and with
the LP pin = Logic “0” the switches will be ON when the
OE pin = Logic “1” and will be OFF (high impedance)
when the OE pin = Logic “0”.
USB 2.0 VBUS Short Requirements
The USB specification in section 7.1.1 states a USB
device must be able to withstand a VBUS short (4.4V to
5.25V) or a -1V short to the D+ or D- signal lines when
the device is either powered off or powered on for at
least 24 hours.
The ISL54228 part has special power-off protection and
OVP detection circuitry to meet these short circuit
requirements. This circuitry allows the ISL54228 to
provide protection to the USB down-stream transceiver
connected at its signal pins (D-, D+) to meet the USB
specification short circuit requirements.
The power-off protection and OVP circuitry allows the
COM pins (COM-, COM+) to be driven up to 5.25V or
down to -5V while the VDD supply voltage is in the range
of 0V to 5.25V. In these overvoltage conditions, the part
draws < 55A of current into the COM pins and causes
no stress/damage to the IC. In addition, all switches are
OFF and the shorted VBUS voltage will be isolated from
getting through to the other side of the switch channels,
thereby protecting the USB transceiver.
TABLE 2. LOGIC CONTROL VOLTAGE LEVELS
VDD SUPPLY
RANGE
LOGIC = “0” (LOW)
LOGIC = “1”
(HIGH)
OE
LP
OE
LP
2.7V to 3.6V
≤ 0.5V
or
floating
≤ 0.5V
or
floating
≥1.4V
3.7V to 4.2V
≤ 0.7V
or
floating
≤ 0.7V
or
floating
≥1.7V
4.3V to 5.25V
≤ 0.8V
or
floating
≤ 0.8V
or
floating
≥2.0V
ISL54228
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