US211C Datasheet PDF - Unisonic Technologies
Part Number | US211C | |
Description | HIGH-SIDE POWER SWITCHES | |
Manufacturers | Unisonic Technologies | |
Logo | ||
There is a preview and US211C download ( pdf file ) link at the bottom of this page. Total 8 Pages |
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US211/A/B/C
Preliminary
HIGH-SIDE POWER SWITCHES
WITH FLAG
DESCRIPTION
The UTC US211/A/B/C series are 80mΩ high-side power
switches. There’s internal single low voltage N-Channel MOSFET
which makes it an ideal for all USB applications. This MOSFET
should be driven by a charge pump circuitry inside. Its switch on
resistance is as low as 80mΩ which we know specially meets the
drop voltage for USB applications.
The flag pin can output an open-drain fault flag to next controller.
There’re lots internal special ways for protecting the chip’s
operation.
When in hot-plug events, there’s large current which can create
the upstream voltage droop to match the USB’s voltage droop
requirements and soft-start for isolating the power source.
As soon as the die temperature is higher than 130℃, the internal
shutdown circuit will work.
Only when there’s a normal input voltage in the VIN pin, the
UVLO (under-voltage lockout, 1.3V/2.5V typ.) can make sure the
chip is till in the off state.
Because of the requirement of USB power the fault current
should be ensured less than 0.6A/1.1A (UTC US211/A, single port)
and 1.3A /1.5A (UTC US211B/C, dual ports).
FEATURES
* 80mΩ(Typ) N-Channel MOSFET
* Supply Current:
– Switch On : 25μA(Typ)
– Switch Off : 1μA (Typ)
* Load Current 500mA for US211 and 1.0A for US211A/B/C
* Input Voltage from 2V ~ 5.5V
* In Off-State: Output Voltage can be Higher than Input
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
US211XXL-AF5-R
US211XXG-AF5-R
Package
SOT-25
CMOS IC
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2014 Unisonic Technologies Co., Ltd
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US211/A/B/C
Preliminary
CMOS IC
APPLICATION INFORMATION(Cont.)
Current Limiting and Short-Circuit Protection
The current limit circuit protects the MOSFET switch and the hub downstream port from damage. This circuit can
deliver load current up to the current limit threshold of typically 0.8A through the switch of US211, 1.5A for US211A,
1.7A for US211B and 2.0A for US211C. When an enabled switch applies a heavy load or short circuit, a
large-desired transient current occurs which can cause the current limit circuit response. If this current becomes
higher than the current limit threshold, the devices enter constant current mode until thermal shutdown occurs or the
fault is removed.
Thermal Shutdown
The thermal shutdown circuit is used to prevent damage occurs when the die temperature becomes higher than
approximately 130°C. After 20°C of hysteresis, the switch will automatically restart if it enabled. When these devices
are disabled or the fault is removed, the output and FLG signal will continue to cycle on and off.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for US211C electronic component. |
Information | Total 8 Pages | |
Link URL | [ Copy URL to Clipboard ] | |
Download | [ US211C.PDF Datasheet ] |
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