A3930 and A3931
Automotive 3-Phase BLDC Controller and MOSFET Driver
FEATURES AND BENEFITS DESCRIPTION
The A3930 and A3931 are three-phase brushless DC (BLDC)
High current three-phase gate drive for N-channel
motor controllers for use with N-channel external power
MOSFETs
MOSFETs. They incorporate much of the circuitry required
Synchronous rectification
to design a cost-effective three-phase motor drive system, and
Cross-conduction protection
have been specifically designed for automotive applications.
Charge pump and top-off charge pump for 100% PWM
Integrated commutation decoder logic
A key automotive requirement is functionality over a wide
Operation over 5.5 to 50 V supply voltage range
input supply range. A unique charge pump regulator pro-
Extensive diagnostics output
vides adequate (>10 V) gate drive for battery voltages down
Provides +5 V Hall sensor power
to 7 V, and allows the device to operate with a reduced gate
Low-current sleep mode
drive at battery voltages down to 5.5 V. Power dissipation in
the charge pump is minimized by switching from a voltage
doubling mode at low supply voltage to a dropout mode at
the nominal running voltage of 14 V.
A bootstrap capacitor is used to provide the above-battery
supply voltage required for N-channel MOSFETs. An
PACKAGE: internal charge pump for the high-side drive allows for DC
(100% duty cycle) operation.
48-Lead LQFP with exposed thermal pad
(suffix JP)
Internal fixed-frequency PWM current control circuitry can
be used to regulate the maximum load current. The peak
load current limit is set by the selection of an input reference
voltage and external sensing resistor. The PWM frequency
is set by a user-selected external RC timing network. For
added flexibility, the PWM input can be used to provide
Not to scale
Continued on the next page
Typical Application
3930-DS Rev. 5 July 27, 2018
MCO-0000483A3930 and
Automotive 3-Phase BLDC Controller
and MOSFET Driver
A3931
DESCRIPTION (CONTINUED)
speed and torque control, allowing the internal current control combination on the Hall inputs. In this state, the A3930 indicates
circuit to set the maximum current limit.
a logic fault, but the A3931 pre-positions the motor in an unstable
starting position suitable for start-up algorithms in microproces-
Efficiency is enhanced by using synchronous rectification. The
sor-driven sensor-less control systems.
power FETs are protected from shoot-through by integrated
crossover control with dead time. The dead time can be set by a
Both devices are supplied in a 48-pin LQFP with exposed thermal
single external resistor.
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pad. This is a small footprint (81 mm ) power package. The pack-
The A3930 and A3931 only differ in their response to the all-zero age is lead (Pb) free, with 100% matte-tin leadframe plating.
SELECTION GUIDE
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 48 LQFP surface mount
* Contact Marketing
ABSOLUTE MAXIMUM RATINGS
Parameter Symbol Conditions Rating Units
Load Supply Voltage V VBB pin 0.3 to 50 V
BB
V RESET pin input 0.3 to 6 V
RESET
Logic Input/Output Voltage
Remaining logic pins 0.3 to 7 V
V GHA, GHB, and GHC pins V to V + 15 V
GHx Sx Sx
V GLA, GLB, and GLC pins 5 to 16 V
GLx
V CA, CB, and CC pins V + 15 V
Cx Sx
Output Voltage Range V SA, SB, and SC pins 5 to 55 V
Sx
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 40 to 150 C
A
Junction Temperature T 150 C
J
Overtemperature event not exceed-
ing 1 s, lifetime duration not exceed-
Transient Junction Temperature T 175 C
tJ
ing 10 hr; guaranteed by design
characterization
Storage Temperature Range T 55 to 150 C
S
AEC-Q100-002, all pins except CP1 2000 V
ESD Rating, Human Body Model
AEC-Q100-002, pin CP1 1000 V
ESD Rating, Charged Device Model AEC-Q100-011, all pins 1050 V
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Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com