RT9702/A
80mΩ, 500mA/1.1A High-Side Power Switches with Flag
Ω
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's low R
DS(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.
Features
Compliant to USB Specifications
Built-In (Typically 80mΩ) N-Channel MOSFET
Ω
Output Can Be Forced Higher Than Input (Off-State)
Low Supply Current :
25μA Typical at Switch On State
μ
1μA Typical at Switch Off State
μ
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 body diode)
Smallest
SOT-23-5 and
TSOT-23-5 Packages
Minimizes Board Space
UL Approved
−
E219878
TUV
IEC60950-1 : 2005
Certified
RoHS Compliant and 100% Lead (Pb)-Free
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-23-5
J5 : TSOT-23-5
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
1.1A Output Current
500mA Output Current
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.
Note :
RichTek Pb-free and Green products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
100% matte tin (Sn) plating.
DS9702/A-11 June 2007
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
