A4930_16 Datasheet, PDF (1/10 Pages) Allegro MicroSystems – Single Phase Fan Pre-Driver

Features and Benefits
▪ Synchronous rectification for low power dissipation
▪ Drives four N-channel MOSFETs
▪ Internal UVLO and thermal shutdown circuitry
▪ Hall element input
▪ PWM current limiting
▪ Dead time protection
▪ FG output
▪ RD output
▪ Lock detect protection
▪ High V_BB absolute maximum
▪ Soft start
▪ A4930GETTR-T AEC-Q100 qualified
Package: 28-pin QFN with exposed
thermal pad (suffix ET)
A4930
Single Phase Fan Pre-Driver
Description
Designed for pulse width modulated (PWM) current control
of single phase brushless fans, the A4930 minimizes external
component count and integrates all the key features required
for high-current fans. Internal synchronous rectification control
circuitry is provided to improve power dissipation in the
external MOSFETs during PWM operation. Internal circuit
protection includes thermal shutdown with hysteresis, rotor
lock, and dead time protection.
The A4930 is supplied in a 0.90 nominal overall height,
5 mm × 5 mm, 28-pin QFN with exposed thermal pad, (suffix
ET). It is lead (Pb) free with 100% matte tin leadframe
plating.
Approximate size
Hall
500 Ω
VREG5
0.1 μF
0.1 μF
CLD
RD
FGO
Hall
HP
Hall
HN
3.5v
PWM
1.5v
VREG5
SIN
0.1 μF
5 kΩ
8.2 kΩ
SMIN
470 pF
CPWM
51 kΩ
CDEL
Functional Block Diagram
0.1 μF
0.1 μF
5V
8V
Lock Detect
CHARGE PUMP
VCP
VBB
0.1 μF
0.22 μF
VCP VREG8
Control
Logic
GATE
DRIVE
vref
/5
GHA
SA
GHB
SB
GLB
GLA
SENSE
VREF
SS
VREG5 HP HN
Hall
Fan
1.24 kΩ
5 kΩ
VREG5
100 mΩ
0.47 μF
4930-DS, Rev. 3
+12V
10 μF