WT6621 Control Switch Datasheet

WT6621 Datasheet, PDF, Equivalent


Part Number

WT6621

Description

Dual USB Power Control Switch

Manufacture

Weitron Technology

Total Page 15 Pages
Datasheet
Download WT6621 Datasheet


WT6621
WT6621
Dual USB Power Control Switch
GENERAL DESCRIPTION
The WT6621 is a dual integrated power switch optimized for self-powered and bus-powered
Universal Serial Bus (USB) applications. Few external components are necessary to satisfy
USB requirements. With independent enable and error flag functions, the WT6621 can ease
control the supplied power conditions of USB down stream; each switch channel can supplies
up to 500mA to downstream devices; the switch low on-resistance meets USB voltage drop
requirements; fault current is limited to typically 750mA, and a flag output is available to
indicate fault conditions to the local USB controller. Additional features include thermal
shutdown to prevent switch failure from high-current loads, undervoltage lockout (UVLO) to
ensure there is a valid input voltage present, and 3.3V and 5V logic compatible enable inputs.
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FEATURES
! Compliant to USB specifications
! Max. Continuous load current: 500mA
! 140mΩ maximum on-resistance per channel.
! 110uA typical on-state supply current
! 1uA typical off-state supply current
! Enable input is compatible with both 3V and 5V Logic
! Logic Over current output
! Undervoltage lockout
! Short Circuit Protection
! Thermal Shutdown
! Active-high or active-low enable versions
! 12KV output, 6KV input ESD protection.
! Packages: 8pin SOIC and 8pin DIP
Applications
! USB host and Self-power hubs
! USB bus-powered hub
! General purpose power switch applications
Version1.0
Weltrend Semiconductor, Inc. All Rights Reserved

27 March, 2000

WT6621
PIN ASSIGNMENT
/EN1
1
/FG1
2
/FG2
3
/EN2
4
WT6621
Dual USB Power Control Switch
WT6621
8 OUT1
7 IN
6 GND
5 OUT2
PIN DESCRIPTIONS
Pin Number Pin Name
1 /EN1
2 /FG1
3 /FG2
4 /EN2
5 OUT2
6 GND
7 IN
8 OUT1
I/O Function Descriptions
I Enable input: Logic Compatible input to turns the
power switch on. (-NX Active Low, -PX active
High)
O Fault Flag: Logic output, open drain output. /FG1
is asserted active low to indicate Overcurrent,
UVLO, and Thermal Shutdown.
O Fault Flag: Logic output, open drain output. /FG2
is asserted active low to indicate Overcurrent,
UVLO, and Thermal Shutdown.
I Enable input: Logic Compatible input to turns the
power switch on. (-NX Active Low, -PX active
High)
O Power Switch output
Ground
I Supply Input
O Power Switch output
Package and Ordering Information
Part Number
WT6621-SL
WT6621-DL
WT6621-SH
WT6621-DH
Enable (/EN)
Active Low
Active Low
Active High
Active High
Package
8-pin SOIC
8-pin DIP
8-pin SOIC
8-pin DIP
Version1.0
Weltrend Semiconductor, Inc. All Rights Reserved

27 March, 2000


Features WT6621 Dual USB Power Control Switch GEN ERAL DESCRIPTION The WT6621 is a dual i ntegrated power switch optimized for se lf-powered and bus-powered Universal Se rial Bus (USB) applications. Few extern al components are necessary to satisfy USB requirements. With independent enab le and error flag functions, the WT6621 can ease control the supplied power co nditions of USB down stream; each switc h channel can supplies up to 500mA to d ownstream devices; the switch low on-re sistance meets USB voltage drop require ments; fault current is limited to typi cally 750mA, and a flag output is avail able to indicate fault conditions to th e local USB controller. Additional feat ures include thermal shutdown to preven t switch failure from high-current load s, undervoltage lockout (UVLO) to ensur e there is a valid input voltage presen t, and 3.3V and 5V logic compatible ena ble inputs. FEATURES ! ! ! ! ! ! ! ! ! ! ! ! ! Compliant to USB specification s Max. Continuous load current: 500mA 140mΩ maximum on-resistan.
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