A3935 3-Phase Power MOSFET Controller for Automotive Applications Features and Benefits Description Drives wide range of N-channel MOSFETs in 3-phase bridges The A3935 is designed specifically for automotive applications PFM boost converter for use with low-voltage battery supplies that require high-power motors. Each provides six high-current Internal LDO regulator for gate-driver supply gate drive outputs capable of driving a wide range of N-channel Bootstrap circuits for high-side gate drivers power MOSFETs. Current monitor output A requirement of automotive systems is steady operation over Adjustable battery overvoltage detection a varying battery input range. The A3935 integrates a pulse- Diagnostic outputs frequency modulated boost converter to create a constant Motor lead short-to-battery, short-to-ground, and bridge- supply voltage for driving the external MOSFETs. Bootstrap open protection capacitors are utilized to provide the above battery supply Undervoltage protection voltage required for N-channel FETs. 40C to 150C T operation J Thermal shutdown Direct control of each gate output is possible via six TTL- compatible inputs. A differential amplifier is integrated to allow accurate measurement of the current in the three-phase bridge. Package 36-pin QSOP (LQ): 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 36-lead 0.8 mm pitch QSOP (package LQ, similar to SOICW). The lead (Pb) free variants (suffix T ) have 100% matte tin leadframe plating. Approximate scale 1:1 Typical Application 26301.102J3-Phase Power MOSFET Controller for Automotive Applications A3935 Selection Guide Part Number Pb-free Packing Terminals Package 1 A3935KLQTR QSOP (similar to 1500 pieces/reel 36 2 SOICW) surface mount A3935KLQTR-T Yes 1 Variant has been determined to be obsolete and is no longer in production. Status change: October 31, 2011. 2 Variant is in production but has been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of the variant is currently restricted to existing customer applications. The variant should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: October 31, 2011. Absolute Maximum Ratings Parameter Symbol Conditions Rating Units V VBAT pin BAT V VDRAIN pin DRAIN Load Supply Voltage 0.6 to 40 V V VBOOST pin BOOST V VBOOSTD pin BOOSTD V GHA, GHB, and GHC pins 4 to 55 V GHx V SA, SB, and SC pins 4 to 40 V Sx Output Voltage Range V GLA, GLB, and GLC pins 4 to 16 V GLx V CA, CB, and CC pins 0.6 to 55 V Cx V CSN and CSP pins CSx Sense Circuit Voltage 4 to 6.5 V V LSS pin LSS Logic Supply Voltage V VDD pin DD V OVSET pin OVSET V BOOSTS pin BOOSTS 0.3 to 6.5 V Logic Input/Output V CSOUT pin CSOUT V VDSTH pin DSTH remaining logic pins ESD Rating Human Body Model AEC-Q100-002 all pins 2.5 kV ESD Rating Charged Device Model AEC-Q100-011 all pins 1050 V Operating Temperature T Range K 40 to 135 C A Fault conditions that produce excessive junction temperature Junction Temperature* T will activate device thermal shutdown circuitry. These condi- 150 C J(max) tions can be tolerated, but should be avoided. Storage Temperature Range T 55 to 150 C stg Allegro MicroSystems, Inc. 2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com