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SC5826のメーカーはSemtech Corporationです、この部品の機能は「HotSwitch USB Power Distribution Switch」です。 |
部品番号 | SC5826 |
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部品説明 | HotSwitch USB Power Distribution Switch | ||
メーカ | Semtech Corporation | ||
ロゴ | |||
このページの下部にプレビューとSC5826ダウンロード(pdfファイル)リンクがあります。 Total 8 pages
HotSwitch™
USB Power Distribution Switch
SC5826
PRELIMINARY - February 18, 2000
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
FEATURES
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.
• Designed to meet USB specification 1.1 power
management requirements
• 500mA continuous load current
• High-side MOSFET switch with low R DS(ON)
• Short-circuit current protection
• Internal thermal shutdown
• Undervoltage lockout
• Logic overcurrent output
• Soft start circuit with slow turn-on time
APPLICATIONS
• Universal Serial Bus (USB) power management
• Self-powered or bus-powered USB hubs
• Root hubs in desktop PCs & servers
• Notebook PCs
• Peripherals
ORDERING INFORMATION
DEVICE(1)
ENABLE
SC5826-1CS
Active High
SC5826-2CS
Active Low
Note:
(1) Add suffix ‘TR’ for tape and reel.
PACKAGE
SO-8
SO-8
PIN CONFIGURATION
BLOCK DIAGRAM
Top View
(8-Pin SOIC)
© 2000 SEMTECH CORP.
1
652 MITCHELL ROAD NEWBURY PARK CA 91320
1 Page HotSwitch™
USB Power Distribution Switch
SC5826
PRELIMINARY - February 18, 2000
ELECTRICAL CHARACTERISTICS(1)(2)
Unless specified: TA = 25°C, VIN = 5V, IOA/IOB = 500mA (Switches ON).
Parameter
Symbol
Conditions
Min Typ Max Units
Power Switch
On Resistance
Output Leakage Current
Output Turn On Rise Time
Output Turn Off Fall Time
Enable Input
High Level Input Voltage
Low Level Input Voltage
Input Current
Output Turn On Delay
Output Turn Off Delay
Current Limit
Short Circuit Current Limit
Supply Current
Outputs Off
Outputs On
Undervoltage Lockout
UVLO Threshold
Hysteresis
Error Flag
Output Resistance
Leakage Current (Off)
Over Temperature Protection
High Trip Level
Hysteresis
rON
IL(OFF)
tR
tF
4.25V ≤ VIN ≤ 5.50V
VO = 5.5V, Switches OFF
CO = 1µF, RO = 10Ω
CO = 1µF, RO = 10Ω
100 140
1
1
0.1 1
mΩ
µA
ms
ms
VEN(HI)
VEN(LO)
IEN
tD(ON)
tD(OFF)
4.25V ≤ VIN ≤ 5.50V
2.4
4.25V ≤ VIN ≤ 5.50V
0.8
EN = VIN, OUTA/B = OPEN
EN = 0V, IOA/IOB = 0mA, OUTA/B = OPEN
01
01
0.25
25 50
V
V
µA
ms
µs
IOS
VOA/VOB = GND, Switches ON
0.65 0.90 1.60 A
IIN(OFF)
IIN(ON)
Switches OFF
IOA/IOB = 0mA
0.02 1
130 200
µA
µA
VUVLO
VHYST
2.2 2.7
90
V
mV
rFLG IFLG = 10mA, VOA/VOB = GND, Switches ON
IFLG VFLG = 5.0V, Switches OFF
10 50
0.01 1
Ω
µA
THI
THYST
160 °C
10 °C
NOTE:
(1) For SC5826-1, Switch OFF is VEN ≤ 0.8V and Switch ON is VEN ≥ 2.4V (“Active High”).
For SC5826-2, Switch ON is VEN ≤ 0.8V and Switch OFF is VEN ≥ 2.4V (“Active Low”).
For testing purposes EN will be 0V or VIN as applicable, unless otherwise specified.
(2) This device is ESD sensitive. Use of standard ESD handling precautions is required.
© 2000 SEMTECH CORP.
3
652 MITCHELL ROAD NEWBURY PARK CA 91320
3Pages HotSwitch™
USB Power Distribution Switch
SC5826
PRELIMINARY - February 18, 2000
TYPICAL APPLICATIONS
Self-powered hub, indidual port power
management:
SC5826 to remove power from the faulty port, allowing
the other ports to operate normally.
A self-powered hub must supply a continuous 500mA
of current to each downstream port. Since an internal
power supply is used to supply the power, self-powered
hubs are required to implement overcurrent protection
for safety. 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
conditions, the SC5826 provides the short-circuit cur-
rent limiting function and has a fault flag logic output for
notifying the hub controller. The USB hub can use the
Since USB is a hot insertion and removal system, USB
ports are subject to electrostatic discharge (ESD). The
SRDA05-4 provides ESD protection on the down-
stream data and power lines. Each device will protect
two USB ports. With proper layout the port is hard-
ened to greater than 15kV, meeting the requirements
of IEC 1000-4-2. On the upstream port, the LCDA05
provides ESD protection to the above levels for one
line pair. The SC5203 (or SC5205) LDO regulator is
used to power the hub controller from the upstream
bus.
Figure 1 - Self-powered hub with individual port power management
© 2000 SEMTECH CORP.
6
652 MITCHELL ROAD NEWBURY PARK CA 91320
6 Page | |||
ページ | 合計 : 8 ページ | ||
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部品番号 | 部品説明 | メーカ |
SC5826 | HotSwitch USB Power Distribution Switch | Semtech Corporation |