A Product Line of
Diodes Incorporated
AM4964
SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER
Description
The AM4964 is highly integrated feature rich single phase Brushless
Direct Current (BLDC) full wave motor driver with combined PWM and
temperature speed control function for fans, blowers and extractors.
Pin Assignments
(Top View)
NC
NEW PRODUCT
For system flexibility, the motor speed can be controlled by an
external PWM signal and temperature sensed by Thermal resister at
the same time. Based on external input PWM and temperature
signals, the AM4964 adjusts the output PWM duty cycle. If the input
PWM duty is constant, the output PWM duty varies with temperature
sensed by Thermal resister sensor between the low and high
temperature corners. If the temperature signal is constant, the output
duty varies with the external input PWM duty. The low and high
temperature corners and the output PWM duty gap between these
temperature corners are adjustable
To help protect the motor coil, the AM4964 provides a rotor lock
protection which shuts down the output if rotor lock is detected. The
device automatically re-starts when the rotor lock is removed.
AM4964 provides a tachometer output
Frequency Generator
(FG). The FG output is the magnetic change frequency.
The AM4964 is available in TSSOP-20EP package.
1
2
3
4
EXPOSED PAD
20
19
18
17
16
15
14
13
12
11
NC
OUT1
TA
TH
SGND
CT
RADJ
IN-
HB
IN+
PGND
OUT2
VCC
VMIN
PWM
CF
FG
RT
TL
5
6
7
8
9
10
TSSOP-20EP
Features
Flexible Speed Control Options
Combined PWM+Thermistor Speed Control
PWM Speed Control
DC Voltage Speed Control
Adjustable Low and High Temperature Corners
Full Speed When Thermal Resistor is Shorted
Adjustable Output Duty Gap between High and Low
Temperature when 100% PWM Input
Built-in oscillator – No external capacitor
Built-in Minimal Speed Setup Circuit
Alpha Slope Adjustable
Rotation Speed Indicator (FG)
Built-in Temperature Control Circuit
Built-in Thermal Shutdown Circuit
Lock Protection and Auto-restart
Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
CPU Cooler Fan in PC
Brushless DC Motor Driver
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AM4964
Document number: DS37241 Rev. 2 - 2
1 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
Pin Descriptions
Pin Number
1,20
2
3
4
Pin Name
NC
PGND
OUT2
VCC
VMIN
PWM
CF
FG
RT
TL
IN+
HB
IN-
RADJ
CT
SGND
TH
TA
OUT1
Exposed pad
Not connected
Power ground
Fan driver output2
Power supply
Minimum speed setting pin
PWM pulse input terminal
Filter capacitor
FG signal output
RT signal output
Low temperature set resistor
Hall sensor input+
Hall bias voltage
Hall sensor input-
Output pulse duty/input pulse duty adjustable terminal
Lock protect and auto start
Signal ground
High temperature set resistor
Output duty gap adjust pin between low and high temperature at 100% input duty
Fan driver output1
Central exposed pad – The central exposed pad is for thermal dissipation. On PCB layout, the
exposed pad can be connected to GND or remain unconnected to any other signals
Function
NEW PRODUCT
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
AM4964
Document number: DS37241 Rev. 2 - 2
3 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
Absolute Maximum Ratings
(Note 4) (@T
A
= +25° unless otherwise specified.)
C,
Symbol
V
CC
I
OUT
V
OUT
V
FG
Supply Voltage
Output Current
Output Voltage
FG Output Voltage
FG Output Current
Power Dissipation
Storage Temperature Range
Thermal Resistance (Junction to Ambient) (Note 5)
ESD (Human Body Model)
ESD (Machine Model)
Parameter
Rating
18
1.0
18
18
10
1.1
-55 to +150
114
3000
300
Unit
V
A
V
V
mA
W
°
C
°
C/W
V
V
NEW PRODUCT
I
FG
P
D
T
STG
JA
ESD
ESD
Notes:
4. Stresses greater than those listed under “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 under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability
5. TSSOP-20EP exposed pad is soldered to minimum recommended landing pads (see Package Outline Dimension section) on a 4.0mm x 3.0mm two-
layer 2oz.copper FR4 PCB (1.6mm thickness) with four thermal vias in the exposed PAD to the copper flood on the bottom layer. See thermal de-rating
curves in the thermal performance section.
Recommended Operating Conditions
Symbol
V
CC
V
IN+
V
IN-
T
A
Supply Voltage
Hall Input Voltage +
Hall Input Voltage -
Ambient Temperature
Parameter
Min
3.5
0.2
0.2
-30
Typ
12
–
–
–
Max
16
3
3
+90
Unit
V
V
V
°
C
AM4964
Document number: DS37241 Rev. 2 - 2
5 of 21
www.diodes.com
June 2014
© Diodes Incorporated
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