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RT9721A fiches techniques PDF

RichTek - 500mA High-Side Power Switches

Numéro de référence RT9721A
Description 500mA High-Side Power Switches
Fabricant RichTek 
Logo RichTek 





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RT9721A fiche technique
RT9721A/B
80mΩ, 500mA High-Side Power Switches with Flag
General Description
Features
The RT9721A/B are low voltage, single N-MOSFET high-
side power switches, optimized for self-powered and bus-
powered Universal Serial Bus (USB) applications. The
RT9721A/B series provides 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. The maximum current is
limited to typically 750mA in dual ports in accordance with
the USB power requirements, lower quiescent current as
50uA making this device ideal for portable battery-operated
equipment.
z Compliant to USB Specifications
z Built-In N-MOSFET
` Typical RDS(ON) : 80mΩ
z Output Can Be Forced to Higher Than Input (Off-
State)
z Low Supply Current :
` 50μA Typical at Switch On State
` 0.1μA Typical at Switch Off State
z Guaranteed 500mA Continuous Load Current
z Wide Input Voltage Ranges : 2.5V to 5.5V
z Open-Drain Fault Flag Output
z Hot Plug-In Application (Soft-Start)
z 2.15V Typical Under-Voltage Lockout (UVLO)
z Current Limiting Protection
z Thermal Shutdown Protection
z Reverse Current Flow Blocking (no body diode)
z UL ApprovedE219878
z RoHS Compliant and Halogen Free
The RT9721A is designed without output auto-discharge
function and RT9721B is designed with output auto-
discharge function.
The RT9721A/B are available in SOT-23-5 package
requiring minimum board space and smallest components.
Applications
z USB Bus/Self Powered Hubs
z USB Peripherals
z Notebook, Motherboard PCs
Ordering Information
RT9721
Pin Configurations
(TOP VIEW)
Package Type
B : SOT-23-5
Lead Plating System
G : Green (Halogen Free and Pb Free)
VOUT
5
FLG
4
23
Output Discharge Function
A : Without Auto-Discharge Function
B : With Auto-Discharge Function
VIN GND EN
SOT-23-5
Note :
Richtek 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.
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
DS9721A/B-02 April 2011
www.richtek.com
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