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Richtek - Single-Phase Full-Wave Fan Motor Driver

Numéro de référence RT8720A
Description Single-Phase Full-Wave Fan Motor Driver
Fabricant Richtek 
Logo Richtek 





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RT8720A fiche technique
®
RT8720A
Single-Phase Full-Wave Fan Motor Driver
General Description
The RT8720A is a single-phase driver IC for fan motors.
Rotation speed is controlled by supply voltage modulation
and PWM input signal. The RT8720A provides several
protection features including lock protection, thermal
shutdown, over-current protection and under-voltage
protection. In thermal shutdown mode, the supply current
is less than 100μA. The rotation frequency is generated
by FG output.
Ordering Information
RT8720A
Package Type
QU : UDFN-8SL 2x2 (U-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
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
1U : Product Code
1UW
W : Date Code
Features
Low Supply Current
PWM Supply Voltage Control Fan Speed
Supply Voltage Speed Control
Smart Force Start-up Function
Built-in Lock Protection
Built-in Thermal Shutdown
Built-in Over-Current Protection
Built-in Frequency Generator with FG Output Signal
Include Hall Bias Circuit
RoHS Compliant and Halogen Free
Applications
Single-Phase Fan Motor for Notebook or PC
Pin Configurations
(TOP VIEW)
OUT2
H+
HB
H-
1
2
3
4
8 OUT1
7 VCC
6 PWM
9 5 FG
UDFN-8SL 2x2
Simplified Application Circuit
Supply
Voltage
Optional
D1
D2
RT8720A
VCC
OUT2
C1
Pull-High Voltage
PWM Control Signal
RFG
OUT1
FG H+
HB
PWM
H-
GND
Single-Phase
Brushless M
DC Motor
Hall
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8720A-01 February 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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