3935

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

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.

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-ble 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).

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, L_SS......................... -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