The A5931 three-phase motor driver IC incorporates sensorless
sinusoidal drive to minimize vibration for high speed server
fans. Sensorless control eliminates the requirement for Hall
sensors for server fan applications.
A flexible closed-loop speed control system is integrated into
the IC. EEPROM is used to tailor the common functions of the
fan speed curve to a specific application. This eliminates the
requirement for a microprocessor-based system and minimizes
programming requirements.
The A5931 is available in a 24-contact 4 mm × 4 mm QFN
with exposed thermal pad (suffix ES), and a 16-lead TSSOP
with exposed thermal pad (suffix LP). These packages are lead
(Pb) free, with 100% matte-tin leadframe plating.
A5931-DS, Rev. 8
MCO-0000278
• AEC-Q100 qualified (K version)
• Closed-loop speed control
• Speed curve configuration via EEPROM
• I
2
C serial port
• Sinusoidal modulation for reduced audible noise and
low vibration
• Sensorless (no Hall sensors required)
• Low R
DS(ON)
power MOSFETs—3 A capability
• Minimal external components
• PWM speed input
• FG speed output
• RD rotor lock output
• Lock detection
• Soft start
• Standby mode
• Shorted load protection
Three-Phase Sensorless Fan Driver IC
PACKAGES:
Figure 1: Typical Application
Not to scale
A5931
FEATURES AND BENEFITS DESCRIPTION
VBB
+12 V
IN
Current
Limit
FG
6
Timing control
GATE
DRIVE
VREF
0.1 µF
VREF
SPD
I2C/EEPROM
Duty In
Speed
Control
Loop
System
Variables
DATA
CLK
GND
SC
SB
SA
Posion
Measure
CP1
CP1
VCP
Charge Pump
LSS
CTAP
OUTA
OUTB
OUTC
RD
0.1 µF
0.1 µF
22 µF
VBB
LSS
DIR
2 kΩ
A5931
24-contact QFN
with exposed thermal pad
4 mm × 4 mm × 0.75 mm
(ES package)
16-lead TSSOP
with exposed thermal pad
(LP package)
July 25, 2019
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