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  Richtek Technology Electronic Components Datasheet  

RT9702 Datasheet

500mA/1.1A High Side Power Switches

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RT9702 pdf
RT9702/A
80mΩ, 500mA/1.1A High Side Power Switches with Flag
General Description
Features
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's low RDS(ON), 80mΩ, 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 25μA
making this device ideal for portable battery-operated
equipment.
The RT9702/A is available in SOT-23-5 and TSOT-23-5
packages requiring minimum board space and smallest
components.
z Compliant to USB Specifications
z Built-In (Typically 80mΩ) N-Channel MOSFET
z Output Can Be Forced Higher Than Input (Off-State)
z Low Supply Current :
25uA Typical at Switch On State
1uA Typical at Switch Off State
z Guaranteed 500mA/RT9702 and 1.1A/RT9702A
Continuous Load Current
z Wide Input Voltage Ranges : 2V to 5.5V
z Open-Drain Fault Flag Output
z Hot Plug-In Application (Soft-Start)
z 1.7V Typical Under Voltage Lockout (UVLO)
z Current Limiting Protection
z Thermal Shutdown Protection
z Reverse Current Flow Blocking (no body diode)
z Smallest SOT-23-5 and TSOT-23-5 Packages
Minimizes Board Space
z UL ApprovedE219878
z TUV IEC60950-1 : 2005 Certified
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
Ordering Information
RT9702/A
Package Type
B : SOT-23-5
J5 : TSOT-23-5
z USB Bus/Self Powered Hubs
z USB Peripherals
z ACPI Power Distribution
z PC Card Hot Swap
z Notebook, Motherboard PCs
Lead Plating System
z Battery-Powered Equipment
P : Pb Free
z Hot-Plug Power Supplies
G : Green (Halogen Free and Pb Free) z Battery-Charger Circuits
1.1A Output Current
Note :
500mA Output Current
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
` Suitable for use in SnPb or Pb-free soldering processes.
DS9702/A-15 April 2011
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9702 Datasheet

500mA/1.1A High Side Power Switches

No Preview Available !

RT9702 pdf
RT9702/A
Pin Configurations
(TOP VIEW)
VOUT
5
VIN
4
23
EN GND FLG
SOT-23-5/TSOT-23-5
Functional Pin Description
Pin Name
VIN
Pin Function
Power Input Voltage
VOUT
Output Voltage
GND
Ground
EN Chip Enable (Active High)
FLG Open-Drain Fault Flag Output
Typical Application Circuit
Pull-Up Resistor (10k to 100k) (Optional)
Flag Transient Filtering) USB Controller
Supply Voltage 5V
1µF
VIN FLG
RT9702/A
10k
0.1µF
Over -Current
Chip Enable
EN VOUT
GND
10µF
150µF
VBUS
D+
D-
GND
Ferrite
Beades
Data
Note: A low-ESR 150μF aluminum electrolytic or tantalum between VOUT and GND is strongly recommended to meet the
330mV maximum droop requirement in the hub VBUS. (see Application Information Section for further details)
Function Block Diagram
EN Bias
UVLO
Oscillator
Charge
Pump
Thermal
Protection
Gate
Control
Current
Limiting
Output Voltage
Detection
Delay
VIN
VOUT
FLG
GND
www.richtek.com
2
DS9702/A-15 April 2011


Part Number RT9702
Description 500mA/1.1A High Side Power Switches
Maker RichTek
Total Page 16 Pages
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