3946_04 Datasheet, PDF (1/13 Pages) Allegro MicroSystems – Half-Bridge Power MOSFET Controller

3946
Half-Bridge Power MOSFET Controller
A3946KLB SOIC
Scale 1:1
VREG 1
CP2 2
CP1 3
PGND 4
GL 5
S6
GH 7
BOOT 8
16 VBB
15 VREF
14 DT
13 LGND
12 RESET
11 IN2
10 IN1
9 ~FAULT
A3946KLP TSSOP with Exposed Thermal Pad
Scale 1:1
VREG 1
CP2 2
CP1 3
PGND 4
GL 5
S6
GH 7
BOOT 8
16 VBB
15 VREF
14 DT
13 LGND
12 RESET
11 IN2
10 IN1
9 ~FAULT
ABSOLUTE MAXIMUM RATINGS
Load Supply Voltage, V ............................. 60 V
BB
Logic Inputs ..................................–0.3 V to 6.5 V
Pin S……. .........................................–4 V to 60 V
Pin GH ...........................................–4 V to 75 V
Pin BOOT….. ................................–0.6 V to 75 V
Pin DT ........................................................ V_REF
Pin VREG ......................................–0.6 V to 15 V
Package Thermal Resistance, R
JA
A3946KLB..................................... 48°C/W¹
A3946KLB..................................... 38°C/W²
A3946KLP ..................................... 44°C/W¹
A3946KLP ..................................... 34°C/W²
Operating Temperature Range, T_A.. –40°C to +135°C
Junction Temperature, T ...........................+150°C
J
Storage Temperature Range, T ....-55°C to +150°C
S
Notes:
1. Measured on a two-sided PCB with 3 in.² of
2 oz. copper.
2. Measured on JEDEC standard High-K board.
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 internally fused leads (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).
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 135ºC ambient operation
Selection Guide
Part Number
A3946KLB
A3946KLB-T
A3946KLBTR
A3946KLBTR-T
A3946KLP
A3946KLP-T
A3946KLPTR
A3946KLPTR-T
Pb-free
–
Yes
–
Yes
–
Yes
–
Yes
Packing
47 pieces/tube
1000 pieces/reel
96 pieces/tube
4000 pieces/reel
Package
16-pin SOIC with internally
fused leads
16-pin TSSOP with exposed
thermal pad