Richtek RT9706 Manual

80mΩ 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 , 80mΩ, meets USB voltage drop
DS(ON)
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 25μA making this device ideal for
portable battery operated equipment.
IC Part Number
Board Number

Evaluation Board

RT9706 SOT-23-5_V0
EVB9706-02 October 2007
Evaluation Board
RT9706
RT9706 SOT-23-5_V0
Features
Compliant to USB Specifications
Built-In (Typically 80mΩ Ω Ω Ω Ω ) N-Channel MOSFET
Output Can Be Forced Higher than Input (Off-State)
Guaranteed 500mA Continuous Load Current
Wide Input Voltage Ranges : 2V to 5.5V
Open-Drain Fault Flag Output
Hot Plug-In Application (Soft-Start)
1.7V Typical Under-Voltage Lockout (UVLO)
Current Limiting Protection
Thermal Shutdown Protection
Reverse Current Flow Blocking (no body diode)
− − − − −
UL Approved E219878
Applications
USB Bus/Self Powered Hubs
USB Peripherals
ACPI Power Distribution
PC Card Hot Swap
Notebook, Motherboard PCs
Battery-Powered Equipment
Hot-Plug Power Supplies
Battery-Charger Circuits
V
EN
(5V/Div)
FLAG
(5V/Div)
I
OUT
(500mA/Div)
RT9706
Flag Response
R
Time (10ms/Div)
www.richtek.com
Ω
= 0
L
1