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US211A Schematic ( PDF Datasheet ) - Unisonic Technologies

Teilenummer US211A
Beschreibung HIGH-SIDE POWER SWITCHES
Hersteller Unisonic Technologies
Logo Unisonic Technologies Logo 




Gesamt 8 Seiten
US211A Datasheet, Funktion
UNISONIC TECHNOLOGIES CO., LTD
US211/A/B/C
Preliminary
HIGH-SIDE POWER SWITCHES
WITH FLAG
DESCRIPTION
The UTC US211/A/B/C series are 80mhigh-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 80mwhich 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
* 80m(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
1 of 8
QW-R502-A67.a
Free Datasheet http://www.Datasheet4U.com






US211A Datasheet, Funktion
US211/A/B/C
TEST CIRCUIT
VIN
CI
Chip
Enable
Preliminary
RFG
VIN FLG
UTC
US211/A/B/C
CTL
VOUT
GND
S1
A
IOUT
CO
VFLG
VOUT
RL IL
Fig.1 Turn-On & Off Response, Flag Response
CMOS IC
ISupply
A
VIN
FLG
VIN CIN
UTC
US211/A/B/C
Chip
Enable
EN VOUT
GND
VFLG
ILEAK AGE
A
RL
Fig.2 Supply Current
VIN CIN
Chip
Enable
VRDS(ON)
V
VIN VOUT
UTC
US211/A/B/C
EN FLG
GND
IOUT
COUT
Fig.3 On-Resistance
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
6 of 8
QW-R502-A67.a
Free Datasheet http://www.Datasheet4U.com

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