Data Sheet
26301.102d
3935
3-PHASE POWER MOSFET CONTROLLER
— For Automotive Applications
The A3935 is designed specifically for automotive applications that
require high-power motors. Each provides six high-current gate drive
outputs capable of driving a wide range of n-channel power MOSFETs.
Package JP, 48-Pin LQFP
A requirement of automotive systems is steady operation over a
varying battery input range. The A3935 integrates a pulse-frequency
modulated boost converter to create a constant supply voltage for
driving the external MOSFETs. Bootstrap capacitors are utilized to
provide the above battery supply voltage required for n-channel FETs.
Direct control of each gate output is possible via six TTL-compat-
ible inputs. A differential amplifier is integrated to allow accurate
measurement of the current in the three-phase bridge.
Diagnostic outputs can be continuously monitored to protect the
driver from short-to-battery, short-to-supply, bridge-open, and battery
under/overvoltage conditions. Additional protection features include
dead-time, VDD undervoltage, and thermal shutdown.
The A3935 is supplied in a choice of two packages, a 48-lead low
profile QFP with exposed thermal pad (suffix JP) and a 36-lead 0.8 mm
pitch SOIC (suffix LQ).
Package LQ, 36-Pin SOIC
ABSOLUTE MAXIMUM RATINGS
Load Supply Voltages, VBAT, VDRAIN,
VBOOST, BOOSTD ...
-0.6 V to 40 V
Output Voltage Ranges,
GHA/GHB/GHC, V
GHX
..
-4 V to 55 V
SA/SB/SC, V
SX
...............
-4 V to 40 V
GLA/GLB/GLC, V
GLX
....
-4 V to 16 V
CA/CB/CC, V
CX
..........
-0.6 V to 55 V
Sense Circuit Voltages,
CSP,CSN, LSS ...............
-4 V to 6.5 V
Logic Supply Voltage,
V
DD
...........................
-0.3 V to +6.5 V
Logic Input/Outputs and OVSET, BOOSTS,
CSOUT, VDSTH .........
-0.3 V to 6.5 V
Operating Temperature Range,
T
A
...........................
-40°C to +135°C
Junction Temperature, T
J
...........
+150°C
Storage Temperature Range,
T
S
...........................
-55°C to +150°C
* Fault conditions that produce excessive
junction temperature will activate device
thermal shutdown circuitry. These conditions
can be tolerated, but should be avoided.
FEATURES
Drives wide range of n-channel MOSFETs in 3-phase bridges
PFM boost converter for use with low-voltage battery supplies
Internal LDO regulator for gate-driver supply
Bootstrap circuits for high-side gate drivers
Current monitor output
Adjustable battery overvoltage detection
Diagnostic outputs
Motor lead short-to-battery, short-to-ground, and
bridge-open protection
Undervoltage protection
-40 °C to +150 °C, T
J
operation
Thermal shutdown
Always order by complete part number, e.g.,
A3935KLQ
.
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