A3946 Half-Bridge Power MOSFET Controller
FEATURES AND BENEFITS
▪ On-chip charge pump for 7 V minimum input supply volt...
A3946 Half-Bridge Power
MOSFET Controller
FEATURES AND BENEFITS
▪ 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 top-off charge pump for 100% duty cycle
▪ Overtemperature protection ▪ Under
voltage protection ▪ –40°C to 135°C ambient operation
PACKAGE: 16-pin TSSOP with exposed thermal pad (Suffix LP)
DESCRIPTION
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 top-off charge pump for the high side allows DC (100% duty cycle) operation of the half-bridge.
The A3946 is available in a power package: a 16‑lead TSSOP with exposed thermal pad (suffix LP). It is lead (Pb) free, with 100% matte tin plated leadframe (suffix -T).
Approximate footprint
Typical Application
VBAT ECU
VBB ~FAULT
BOOT GH
IN1
A3946
S
IN2
PAD
GL
RESET
CP1
DT VREF
CP2 VREG
LGND
PGND
DS-A3946, Rev. 10 MCO-0001191
M
February 18, 2022
A3946
Half-Bridge Power
MOSFET C...