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 ED, 44-Pin PLCC
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.
Package JP, 48-Pin LQFP
Package LQ, 36-Pin SOIC
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 three packages, a 44-lead
PLCC with copper batwing tabs (suffix ED), a 48-lead low profile QFP
with exposed thermal pad (suffix JP), and a 36-lead 0.8 mm pitch SOIC
(suffix LQ).
ABSOLUTE MAXIMUM RATINGS
Load Supply Voltages, VBAT, VDRAIN,
VBOOST, BOOSTD ... -0.6 V to 40 V
Output Voltage Ranges,
FEATURES
GHA/GHB/GHC, VGHX .. -4 V to 55 V
SA/SB/SC, VSX ............... -4 V to 40 V
GLA/GLB/GLC, VGLX.... -4 V to 16 V
CA/CB/CC, VCX .......... -0.6 V to 55 V
Sense Circuit Voltages,
CSP,CSN, LSS ............... -4 V to 6.5 V
Logic Supply Voltage,
VDD ........................... -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,
! 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, TJ operation
! Thermal shutdown
TA ........................... -40°C to +135°C
Junction Temperature, TJ ........... +150°C
Storage Temperature Range,
TS ........................... -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.
Always order by complete part number, e.g., A3935KLQ .