Features: Drives Wide Range of N-ChannelMOSFETs in 3-Phase Bridges
PFM Boost Converter for Use WithLow-Voltage Battery Supplies
Internal LDO Regulator for Gate-Driver Supply
Bootstrap Circuits for High-Side GateDrivers
Current Monitor Output
Adjustable Battery Overvoltage
Diagnostic Outputs
Motor Lead Short-to-Battery,Short-to-Ground, and Bridge-OpenProtection
Undervoltage Protection
-40°C to 150°C, TJ Operation
Thermal ShutdownPinout
SpecificationsLoad Supply Voltages, VBAT, VDRAIN,
VBOOST, BOOSTD............40 V
GHA/GHB/GHC, VGHX .......-4 to 55 V
SA/SB/SC, VSX .......... -4 to 40 V
GLA/GLB/GLC, VGLX ....... -4 to 16 V
CSP,CSN, LSS ..........-4 to 6.5 V
CA/CB/CC, VCX .........-0.6 to 55 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
Package Thermal Impedances (TA = +25°C)
ED pkg: JA (JEDEC Hi-K PCB) ... 23°C/W
LQ pkg: JA (JEDEC Hi-K PCB) ..44 °C/W
Operating Ambient Temperature Range,
TA ........... -40 °C to +135 °C
Operating Junction Temperature Range,
TJ .................................. -40 °C to +150 °C
Storage Temperature Range,
TS ................................. -55 °C to +150 °CDescriptionThe 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-compatible 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 36-lead 0.8 mm pitch QSOP (package LQ, similar to SOICW). The lead (Pb) free variants (suffix ) have 100% matte tin leadframe plating.
A3935 Data Sheet
