Automotive 3-Phase BLDC Controller
and MOSFET Driver
A3930 and
A3931
2
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
torque control, allowing the internal current control circuit to set
the maximum current limit.
Efficiency is enhanced by using synchronous rectification. The
power FETs are protected from shoot-through by integrated
crossover control with dead time. The dead time can be set by a
single external resistor.
The A3930 and A3931 only differ in their response to the all-zero
combination on the Hall inputs. In this state, the A3930 indicates
a logic fault, but the A3931 pre-positions the motor in an unstable
starting position suitable for start-up algorithms in microprocessor-
driven “sensor-less” control systems.
Both devices are supplied in a 48-pin LQFP with exposed thermal
pad. This is a small footprint (81 mm
2
) power package, that is lead
(Pb) free, with 100% matte tin leadframe plating.
Selection Guide
Absolute Maximum Ratings
Part Number Option Packing Terminals Package
A3930KJPTR-T Hall short detection 1500 pieces/reel 48 LQFP surface mount
A3931KJPTR-T Pre-positioning 1500 pieces/reel
Description (continued)
Parameter Symbol Conditions Rating Units
Load Supply Voltage V
BB
VBB pin –0.3 to 50 V
Logic Input/Output Voltage
V
RESET
RESET pin input –0.3 to 6 V
Remaining logic pins –0.3 to 7 V
Output Voltage Range
V
GHx
GHA, GHB, and GHC pins V
Sx
to V
Sx
+ 15 V
V
GLx
GLA, GLB, and GLC pins –5 to 16 V
V
Cx
CA, CB, and CC pins V
Sx
+ 15 V
V
Sx
SA, SB, and SC pins –5 to 55 V
CSP, CSN, and LSS pins –4 to 6.5 V
CSO, VDSTH pins –0.3 to 6.5 V
VDRAIN pin –0.3 to 55 V
Operating Temperature Range (K) T
A
–40 to 150 °C
Junction Temperature T
J
150 °C
Transient Junction Temperature T
tJ
Overtemperature event not exceed-
ing 1 s, lifetime duration not exceed-
ing 10 hr; guaranteed by design
characterization
175 °C
Storage Temperature Range T
S
–55 to 150 °C
ESD Rating, Human Body Model
AEC-Q100-002, all pins except CP1 2000 V
AEC-Q100-002, pin CP1 1000 V
ESD Rating, Charged Device Model AEC-Q100-011, all pins 1050 V
