EVB9706-02 October 2007
www.richtek.com
1
RT9706
Evaluation Board
80m
Ω
Ω
Ω
Ω
Ω
, 500mA High-Side Power Switch with Flag
General Description
The RT9706 is a cost-effective, low voltage, single
N-Channel MOSFET high-side power switch, optimized
for self-powered and bus-powered Universal Serial Bus
(USB) applications. The RT9706 equipped with a charge
pump circuitry to drive the internal MOSFET switch; the
switch's low R
DS(ON)
, 80m
Ω
, meets USB voltage drop
requirements; and a flag output is available to indicate
fault conditions to the local USB controller.
Additional features include soft-start to limit inrush current
during plug-in, thermal shutdown to prevent catastrophic
switch failure from high-current loads, under-voltage
lockout (UVLO) to ensure that the device remains off
unless there is a valid input voltage present, lower
quiescent current as 25
μ
A making this device ideal for
portable battery operated equipment.
Features
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Compliant to USB Specifications
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Built-In (Typically 80m
Ω
Ω
Ω
Ω
Ω
) N-Channel MOSFET
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Output Can Be Forced Higher than Input (Off-State)
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Guaranteed 500mA Continuous Load Current
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Wide Input Voltage Ranges : 2V to 5.5V
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Open-Drain Fault Flag Output
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Hot Plug-In Application (Soft-Start)
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1.7V Typical Under-Voltage Lockout (UVLO)
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Current Limiting Protection
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Thermal Shutdown Protection
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Reverse Current Flow Blocking (no body diode)
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UL Approved
−−−−−
E219878
Applications
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USB Bus/Self Powered Hubs
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USB Peripherals
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ACPI Power Distribution
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PC Card Hot Swap
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Notebook, Motherboard PCs
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Battery-Powered Equipment
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Hot-Plug Power Supplies
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Battery-Charger Circuits
Evaluation Board
Flag Response
Time (10ms/Div)
I
OUT
(500mA/Div)
V
EN
(5V/Div)
FLAG
(5V/Div)
R
L
=
0
Ω
RT9706 SOT-23-5_V0
IC Part Number
RT9706
Board Number
RT9706 SOT-23-5_V0
