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PDF RT8725 Data sheet ( Hoja de datos )
| Número de pieza | RT8725 | |
| Descripción | Single-Phase BLDC Fan Driver IC | |
| Fabricantes | Richtek | |
| Logotipo |  |
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®
RT8725
Single-Phase BLDC Fan Driver IC
General Description
The RT8725 is a single-phase driver IC for fan motors.
Rotation speed is controlled by PWM input signal. The
RT8725 provides several protection features including
standby mode, thermal shutdown, lock protection, over-
current protection and under-voltage protection. The Built-
in smart force start-up function overcomes and avoids
wrong status when electrical noise occurs during start-
up. In the standby and thermal shutdown mode, the supply
current is less than 100μA. The rotation frequency is
generated by FG output.
Ordering Information
RT8725
Package Type
QU : UDFN-8L 2x3 (U-Type)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
Features
z Low Supply Current
z Smart Force Start-up Function
z PWM Supply Voltage Control Fan Speed
z Built-in Motor Lock Protection and Automatic
Restart
z Built-in Thermal Shutdown
z Built-in Over-Current Protection
z Built-in Frequency Generator with FG Output Signal
z RoHS Compliant and Halogen Free
Applications
z Single Phase Fan Motor for Notebook or PC
Pin Configurations
(TOP VIEW)
OUT2
VCC
H+
H-
1
2
3
4
8 GND
7 OUT1
6 PWM
9 5 FG
UDFN-8L 2x3
Marking Information
0A : Product Code
0AW
W : Date Code
Simplified Application Circuit
Optional
Supply D1
Voltage
D2
Hall
RT8725
VCC OUT2
C1
H+
H- OUT1
FG
Single-Phase
Brushless M
DC Motor
RFG
Pull-High Voltage
PWM Control Signal
PWM
GND
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8725-02 October 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT8725
Parameter
FG Low Voltage
FG Leak Current
Input Offset Voltage
Input Hysteresis Voltage
Lock Detection On-Time
Lock Detection Off-Time
Thermal Shutdown Threshold
S ymbol
VFG
IFG
VHOFS
VHys
tON
tOFF
Thermal Shutdown Hysteresis
Quick Start
Standby Detection Time
Quick Start Enable Time
tSD
tQS
Test Conditions
IFG = 5mA
VFG = 5V
Min Typ Max Unit
-- 0.1 0.2 V
-- -- 1 μA
-- -- ±6 mV
±5 ±10 ±15 mV
0.35 0.5 0.65 s
3.5 5 6.5 s
-- 160 --
°C
-- 30 -- °C
0.7 1 1.3 ms
-- 30 -- μs
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may
affect device reliability.
Note 2. θJA is measured at TA = 25°C on a high effective thermal conductivity one/two-layer test board per JEDEC 51-3. θJC is
measured at the exposed pad of the package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8725-02 October 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet RT8725.PDF ] | |
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