SC5826-2CS Semtech Corporation, SC5826-2CS Datasheet

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SC5826-2CS

Manufacturer Part Number
SC5826-2CS
Description
HotSwitch USB Power Distribution Switch
Manufacturer
Semtech Corporation
Datasheet
PRELIMINARY - February 18, 2000
DESCRIPTION
USB power distribution switches are high-side n-
channel MOSFET switches with built-in overcurrent
protection and low on-state resistance. The SC5826
switch is designed to meet the USB requirements for
power switching and maintenance-free fault protection
for self-powered & bus-powered hub applications. The
SC5826 features low on-state resistance to meet the
USB requirement for voltage drop and regulation. The
switch is controlled by an enable input that is
compatible with 3V and 5V logic. The enable input is
available with an active high or active low input for
maximum design flexibility. The device provides short
circuit current limiting at a value of less than 1.6A, well
below the USB limit of 5A. During an overcurrent
condition the device provides a fault notification to
signal the USB controller. An integrated thermal
protection circuit automatically shuts the switch off
when the junction temperature reaches its thermal
limit. The switch remains off until the junction
temperature drops approximately 10°C. The switch will
continue to cycle on and off until the fault is removed.
Inrush current limiting prevents the voltage drop on an
upstream port when the switch is enabled. An
undervoltage lockout circuit guarantees the switch is
initially off during start-up.
PIN CONFIGURATION
© 2000 SEMTECH CORP.
(8-Pin SOIC)
Top View
HotSwitch™
USB Power Distribution Switch
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
BLOCK DIAGRAM
FEATURES
APPLICATIONS
ORDERING INFORMATION
SC5826-1CS
SC5826-2CS
Note:
(1) Add suffix ‘TR’ for tape and reel.
652 MITCHELL ROAD NEWBURY PARK CA 91320
Designed to meet USB specification 1.1 power
management requirements
500mA continuous load current
High-side MOSFET switch with low R
Short-circuit current protection
Internal thermal shutdown
Undervoltage lockout
Logic overcurrent output
Soft start circuit with slow turn-on time
Universal Serial Bus (USB) power management
Self-powered or bus-powered USB hubs
Root hubs in desktop PCs & servers
Notebook PCs
Peripherals
DEVICE
(1)
Active High
Active Low
ENABLE
SC5826
DS(ON)
PACKAGE
SO-8
SO-8
1

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SC5826-2CS Summary of contents

Page 1

... Universal Serial Bus (USB) power management Self-powered or bus-powered USB hubs Root hubs in desktop PCs & servers Notebook PCs Peripherals ORDERING INFORMATION (1) DEVICE SC5826-1CS SC5826-2CS Note: (1) Add suffix ‘TR’ for tape and reel. BLOCK DIAGRAM 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC5826 DS(ON) ENABLE PACKAGE ...

Page 2

... HotSwitch™ USB Power Distribution Switch Symbol OUT STG T L 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC5826 Maximum Units - Internally Limited mA -40 to +85 °C -40 to +125 °C -65 to +150 °C 300 °C 2 ...

Page 3

... Leakage Current (Off) Over Temperature Protection High Trip Level Hysteresis NOTE: (1) For SC5826-1, Switch OFF is V For SC5826-2, Switch For testing purposes EN will (2) This device is ESD sensitive. Use of standard ESD handling precautions is required. © 2000 SEMTECH CORP. ...

Page 4

... MITCHELL ROAD NEWBURY PARK CA 91320 SC5826 Supply Current (Outputs On) vs. Junction Temperature - 100 T (°C) J Short Circuit Output Current vs. Junction Temperature - 100 T (°C) J 125 150 ...

Page 5

... Enable Input A logic signal at the enable (EN) pin activates the power MOSFET switch. A logic 1 (SC5826-1) or logic 0 (SC5826-2) will bias the charge pump, gate drive, and control circuitry turning on the power switch. A logic signal of opposite polarity turns off the switch. If both outputs are off, the device powers down. The en- able input is compatible with 3V & ...

Page 6

... The self-powered hub must also have a method to detect and report fault conditions to the USB controller. The circuit below utilizes the SC5826 to pro- vide individual port overcurrent protection & power switching for maximum port protection. Under fault ...

Page 7

... Inrush current limiting is also required to prevent power supply drooping. The circuit below utilizes the SC5826 to provide ganged port power switching, inrush current limiting and overcurrent protection for maximum port protection ...

Page 8

... PRELIMINARY - February 18, 2000 OUTLINE DRAWING - SO-8 LAND PATTERN - SO-8 ECN00-886 © 2000 SEMTECH CORP. HotSwitch™ USB Power Distribution Switch 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC5826 JEDEC REF: MS-012AA 8 ...

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