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RT9702A Datasheet

  • RT9702A

  • Power Management/Switchers

  • 16頁

  • ETC

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Preliminary
RT9702/A
80m鈩? 500mA/1.1A High-Side Power Switches with Flag
General Description
The RT9702 and RT9702A are cost-effective, low
voltage, single N-Channel MOSFET high-side power
switches, optimized for self-powered and bus-
powered Universal Serial Bus (USB) applications.
The RT9702/A equipped with a charge pump
circuitry to drive the internal MOSFET switch; the
switch鈥檚 low R
DS(ON)
, 80m鈩? 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, fault current is limited to typically
800mA for RT9702 in single port and 1.5A for
RT9702A in dual ports in accordance with the USB
power requirements, lower quiescent current as
25碌A(chǔ) making this device ideal for portable
battery-operated equipment.
The RT9702/A is available in SOT-25 package
requiring minimum board space and smallest
components.
Features
Compliant to USB Specifications
Built-In (Typically 80m鈩? N-Channel MOSFET
Output Can Be Forced Higher Than Input
(Off-State)
Low Supply Current:
25碌A(chǔ) Typical at Switch On State
0.1碌A(chǔ) Typical at Switch Off State
Guaranteed 500mA/RT9702 and 1.1A/RT9702A
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 鈥渂ody
diode)
Smallest SOT-25 Package Minimizes Board
Space
UL Approved 鈥?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
Ordering Information
RT9702/A
Package Type
B : SOT-25
Operating Temperature Range
C: Commercial Standard
1.1A Output Current
500mA Output Current
Pin Configurations
Part Number
RT9702/ACB
(Plastic SOT-25)
5
Pin Configurations
4
Marking Information
For marking information, contact our sales
representative directly or through a RichTek
distributor located in your area, otherwise visit our
website for detail.
1
2
3
TOP VIEW
1. CE
2. GND
3. FLG
4. VIN
5. VOUT
DS9702A-01
March 2003
www.richtek.com
1

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