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®
RT8723
Single-Phase Full-Wave Fan Motor Driver
General Description
The RT8723 is a single-phase driver IC for fan motors.
Rotation speed is controlled by supply voltage modulation
and PWM input signal. In the supply voltage control
application, the fan speed slope is adjustable by the
external voltage input. The RT8723 provides several
protection features including the standby mode, thermal
shutdown, lock protection, the over-current protection and
also the under-voltage protection. In standby and thermal
shutdown mode, supply current is less than 100μA. The
rotation frequency is generated by FG output.
Features
z Low Supply Current
z PWM Supply Voltage Control Fan Speed
z Adjustable Voltage Control Fan Speed
z Smart Force Start-Up Function
z Built-In Lock Protection
z Built-In Thermal Shutdown
z Built-In Over-Current Protection
z Built-In Frequency Generator with FG Output Signal
z Include Hall Bias Circuit
z RoHS Compliant and Halogen Free
Ordering Information
RT8723
Package Type
QU : UDFN-10L 3x3 (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.
Applications
z Single Phase Fan Motor for Notebook or PC
Marking Information
2M=YM
DNN
2M= : Product Code
YMDNN : Date Code
Simplified Application Circuit
Supply
Voltage
Optional
D1
D2
RT8723
VCC
OUT2
C1
PWM Control Signal
Pull-High Voltage
Floating
PWM
OUT1
RFG
FG
HB
SET H+
GND H-
Single Phase
Brushless M
DC Motor
Hall
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8723-03 October 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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RT8723
Pin Configurations
(TOP VIEW)
OUT2 1
VCC 2
H+ 3
HB 4
H- 5
10 GND
9 OUT1
8 PWM
7 FG
11 6 SET
UDFN-10L 3x3
Function Pin Description
Pin No.
Pin Name
Pin Function
1
OUT2
Output of H-Bridge for DC Motor.
2 VCC
Power Supply Input.
3 H+
Positive Hall Input.
4 HB
Hall Bias Voltage Output.
5 H
Negative Hall Input.
6 SET
Speed Slop Setting.
7 FG
Output for Rotation Speed. This is an open drain output.
8 PWM PWM Signal Input.
9
10,
11 (Exposed Pad)
OUT1
GND
Output of H-Bridge for DC Motor.
Power Ground. The Exposed Pad should be soldered to a large PCB and
connected to GND for maximum thermal dissipation.
Function Block Diagram
VCC
H+
H-
+
-
+
-
+
-
OUT2
-
+
+
-
OSC
Control
Lock
Protection
TSD
VCC
Duty
Gen.
OCP
Hall
Bias
OUT1
PWM
SET
GND
FG
HB
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RT8723
Operation
Lockup Protection and Automatic Restart
When the motor is locked, a lock detection circuit will
detect this situation within a time duration (TON, typical
0.5s), and the driver will try to restart the motor. If restart
failed, the circuit will disable the output drivers regardless
of the duty ratio of the PWM to prevent the motor coil
from burnout. After another time duration (TOFF, typical
5s), the IC will automatically try to restart the motor. If the
motor is still locked, then the iteration of the lock detection
and restart will be repeated until the lock condition is
released or the external PWM input is pulled low.
H+
H-
Quick Start and Standby Mode
The operation mode of RT8723 is determined by the
external PWM input. During the power up, if the PWM
input remains at a low-level voltage, the IC will enter the
low power standby mode. If the PWM input is kept at a
high-level voltage or is a pulse signal, the IC will operate
in the normal mode. On the other hand, during the normal
operation, when the PWM input is set to a low-level voltage
for more than 1ms (typ.), the IC will enter the low-power
standby mode. Once the PWM input is pulled up again,
the IC will be activated immediately for normal operations.
In the standby mode, supply current is around 100μA.
PWM
tSD
1ms
OUT1
Mode Normal Mode Standby Mode Normal Mode
OUT2
FG
ICC
tON tOFF
tON tOFF
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8723-03 October 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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RT8723
Absolute Maximum Ratings (Note 1)
z Supply Input Voltage, VCC (<300ns) ----------------------------------------------------------------------------- 0.3V to 10V
z Hall Input Voltage Range, H+, H- ---------------------------------------------------------------------------------- 0.3V to 6V
z SET Input Voltage, SET- --------------------------------------------------------------------------------------------- 0.3V to 6V
z PWM Input Voltage, PWM ------------------------------------------------------------------------------------------ 0.3V to 6V
z Output Voltage, OUT1, OUT2, FG --------------------------------------------------------------------------------- 0.3V to 6V
z Maximum Output Current, OUT1, OUT2 ------------------------------------------------------------------------- 1A
z Power Dissipation, PD @ TA = 25°C, θJA = 150°C
UDFN-10L 3x3 (One-Layer) ----------------------------------------------------------------------------------------- 0.6W
UDFN-10L 3x3 (Two-Layer) ------------------------------------------------------------------------------------------ 2.83W
z Package Thermal Resistance (Note 2)
UDFN-10L 3x3 (One-Layer), θJA ----------------------------------------------------------------------------------- 206.9°C/W
UDFN-10L 3x3 (One-Layer), θJC ----------------------------------------------------------------------------------- 6.3°C/W
UDFN-10L 3x3 (Two-Layer), θJA ------------------------------------------------------------------------------------ 44.2°C/W
UDFN-10L 3x3 (Two-Layer), θJC ----------------------------------------------------------------------------------- 6.3°C/W
z Junction Temperature ------------------------------------------------------------------------------------------------- 150°C
z Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260°C
z Storage Temperature Range ---------------------------------------------------------------------------------------- 65°C to 150°C
Recommended Operating Conditions (Note 4)
z Supply Input Voltage, VCC ------------------------------------------------------------------------------------------ 1.8V to 5.5V
z Hall Input Voltage, H+, H------------------------------------------------------------------------------------------- 0.4V to (VCC 1.1V)
z SET Input Voltage, SET --------------------------------------------------------------------------------------------- 0.1V to VHB
z PWM Input Voltage, PWM ------------------------------------------------------------------------------------------ 0V to VCC
z Junction Temperature Range ---------------------------------------------------------------------------------------- 40°C to 125°C
z Ambient Temperature Range ---------------------------------------------------------------------------------------- 40°C to 105°C
Electrical Characteristics
(VCC = 5V, TA = 25°C, Unless Otherwise specification)
Parameter
Symbol
Test Conditions
Operating Current
ICC1
Rotation Mode and Lock Protection
Mode
Standby Current
ICC2
Standby Mode (PWM = 0)
Min
--
--
High-Level VPWM_H
PWM Input Voltage
Low-Level VPWM_L
PWM Input Frequency
fPW M
PWM Input
Leakage
High-Level IPW M_H
Low-Level IPW M_L
@PWM Mode
@PWM Mode
@PWM Mode
VPW M = VCC, @PWM Mode
VPW M = 0, @PWM Mode
1.8
0
2
--
30
Typ Max Unit
3.5 5 mA
100 200 μA
-- VCC
+ 0.5 V
-- 0.7
-- 50 kHz
05
10 --
μA
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RT8723
Parameter
Input-Output Gain
Input Offset Voltage
Input Hysteresis Voltage
Output Voltage
FG Pin Low Voltage
FG Pin Leak Current
Hall Bias Voltage
High-Level
SET Input Leakage
Low-Level
Lock Detection On-Time
Lock Detection Off-Time
Thermal Shutdown
Thermal Shutdown Hysteresis
Symbol
GIO
VHOFS
VHys
VOUT
VFG
IFG
VHB
IS ET_H
IS ET_L
TON
TOFF
Test Conditions
VOUT/H+ H- (Ratio)
IOUT = 250mA
IFG = 5mA
VFG = VCC
IHB = 5mA
VSET = VCC, @ADJ Mode
VSET = 0V, @ADJ Mode
Supply Voltage Threshold
Quick Start
VCC_TH
Standby Detection Time
Quick Start Enable Time
tS D
tQS
Min Typ Max Unit
42 44.6 47 dB
-- -- ±6 mV
±5 ±10 ±15 mV
-- 0.2 0.4
--- 0.1 0.2
V
V
-- -- 1 μA
1.26 1.3 1.34 V
-- -- 1
μA
-- -- 1
0.35 0.5 0.65 s
3.5 5 6.5 s
-- 160 --
°C
-- 30 -- °C
3 3.5 4
V
0.7 1 1.3 ms
-- 30 -- μs
Note 1. Stresses beyond those listed Absolute Maximum Ratingsmay 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.
DS8723-03 October 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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