RT9721A RICHTEK [Richtek Technology Corporation], RT9721A Datasheet - Page 2

• Manufacturer Part Number: RT9721A
• Description: 80m?, 500mA High-Side Power Switches with Flag
• Manufacturer: RICHTEK [Richtek Technology Corporation]

Typical Application Circuit
RT9721A/B
Function Block Diagram
www.richtek.com
2
Functional Pin Description
Pin No.
1
2
3
4
5
VIN
GND
EN
FLG
VOUT
Pin Name
EN
Chip Enable
Voltage 5V
Supply
Switch Input Voltage.
Ground.
Chip Enable (Active High).
Open-Drain Fault Flag Output.
Switch Output Voltage.
Oscillator
Bias
Pull-Up Resistor (10k to 100k)
Protection
1µF
C
Thermal
IN
Charge
Pump
1
3
UVLO
VIN
EN
RT9721A/B
GND
2
VOUT
FLG
4
5
Control
Pin Function
Gate
Ferrite
Beads
10µF
C
OUT
RT9721B Only
Limiting
Current
Output Voltage
Auto Discharge
USB Controller
Over -Current
Detection
Delay
150µF
Data
V
D+
D-
GND
BUS
DS9721A/B-02 April 2011
VIN
VOUT
FLG
GND