3946

Half-Bridge Power MOSFET Controller

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

MOSFET

that controls current to the load, while the low-side gate driver switches

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

On-chip charge pump for 7 V minimum input supply voltage

High-current gate drive for driving a wide range of

N-channel

Bootstrapped gate drive with charge pump for 100% duty cycle

Overtemperature protection

Undervoltage protection

–40ºC to 135ºC ambient operation

Always order by complete part number:

Load Supply Voltage, V

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

A3946KLB..................................... 38

A3946KLP ..................................... 44

A3946KLP ..................................... 34

Operating Temperature Range, T

Junction Temperature, T

Storage Temperature Range, T

Notes:

2 oz. copper.

2. Measured on JEDEC standard High-K board.

ABSOLUTE MAXIMUM RATINGS

A3946KLB SOIC

A3946KLP TSSOP with Exposed Thermal Pad

3

4

5

6

7

8

2

1

14

13

12

11

10

9

15

16

VREG

CP2

CP1

PGND

GL

S

GH

BOOT

VBB

VREF

DT

LGND

RESET

IN2

IN1

~FAULT

FEATURES

Scale 1:1

Scale 1:1

3

4

5

6

7

8

2

1

14

13

12

11

10

9

15

16

VREG

CP2

CP1

PGND

GL

S

GH

BOOT

VBB

VREF

DT

LGND

RESET

IN2

IN1

~FAULT

Part Number

Package

A3946KLB

A3946KLP

16-Lead SOIC; Copper Batwing Power Tab

16-Lead TSSOP; Exposed Thermal Pad