A3946_16 Datasheet, PDF (1/14 Pages) Allegro MicroSystems – Half-Bridge Power MOSFET Controller

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
▪ Undervoltage protection
▪ –40ºC to 135ºC ambient operation
Package: 16-pin TSSOP with exposed
thermal pad (Suffix LP)
Description
TheA3946 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.
Abootstrap 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 Scale 1:1
Typical Application
V_BAT
ECU
VBB
~FAULT
BOOT
GH
IN1
A3946
S
IN2
PAD
GL
RESET
CP1
M
CP2
DT
VREF
VREG
LGND
PGND
29319.150i