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Allegro MicroSystems - Half-Bridge Power MOSFET Controller

Numéro de référence A3946
Description Half-Bridge Power MOSFET Controller
Fabricant Allegro MicroSystems 
Logo Allegro MicroSystems 





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A3946 fiche technique
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
Packages:
16-pin SOICW (suffix LB)
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 choice of two power packages:
a 16-lead SOIC with two internally-fused pins for enhanced
power dissipation (part number suffix LB), and a 16-lead
TSSOP with exposed thermal pad (suffix LP). Both packages
have a lead (Pb) free version, with 100% matte tin plated
leadframes (suffix -T).
Approximate Scale 1:1
Typical Application
VBAT
ECU
VBB
~FAULT
BOOT
GH
IN1
IN2
RESET
A3946
S
GL
CP1
DT
VREF
CP2
VREG
LGND
PGND
M
29319.150h

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