Half-bridge Power MOSFET Controller
3946
Half-Bridge Power MOSFET Controller
A3946KLB SOIC
Data Sheet 29319.150
VREG CP2 CP1 PGND GL S
1 2 3 4 5 6 7 8
1...
Description
3946
Half-Bridge Power MOSFET Controller
A3946KLB SOIC
Data Sheet 29319.150
VREG CP2 CP1 PGND GL S
1 2 3 4 5 6 7 8
16 VBB 15 VREF 14 DT 13 LGND 12 RESET 11 IN2
The A3946 is designed specifically for applications that require high power unidirectional dc motors, three-phase brushless dc motors, or other inductive loads. The A3946 provides two high-current gate drive outputs that are capable of driving a wide range of power N-channel MOSFETs. The high-side gate driver switches an N-channel MOSFET that controls current to the load, while the low-side gate driver switches an N-channel MOSFET as a synchronous rectifier. A bootstrap capacitor provides the above-battery supply voltage required for N-channel MOSFETs. An internal charge pump for the high side allows for dc (100% duty cycle) operation of the half-bridge. The A3946 is available in a choice of two power packages: a 16-lead SOIC with copper batwing power tab (part number suffix LB), and a 16-lead TSSOP with exposed thermal pad (suffix LP).
Scale 1:1
GH BOOT
10 IN1 9 ~FAULT
A3946KLP TSSOP with Exposed Thermal Pad
VREG CP2 CP1 PGND GL S GH 1 2 3 4 5 6 7 8 16 VBB 15 VREF 14 DT 13 LGND 12 RESET 11 IN2 10 IN1 9 ~FAULT
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Scale 1:1
BOOT
FEATURES
On-chip charge pump for 7 V minimum input supply voltage High-current gate drive for driving a wide range of N-channel MOSFETs Bootstrapped gate drive with charge pump for 100% duty cycle Overtemperature protection Undervoltage protection –40ºC to 1...
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