Always order by complete part number

FULL-BRIDGE POWER MOSFET CONTROLLER

— For Automotive Applications

3940

The A3940KLP and A3940KLW are designed specifically for

automotive applications that require high-power motors. Each provides

four high-current gate drive outputs capable of driving a wide range of

n-channel power MOSFETs in a full-bridge configuration.

Bootstrap capacitors are utilized to provide the above-battery

supply voltage required for n-channel FETs. An internal charge pump

for the high side allows for dc (100% duty cycle) operation of the

bridge.

Protection features include supply under/overvoltage, thermal

shutdown, and motor lead short-to-battery and short-to-ground fault

notification, and a programmable dead-time adjustment for cross-

conduction prevention.

The A3940 is supplied in a choice of two power packages, a 28-pin

TSSOP with an exposed thermal pad (package type LP), and a 28-pin

wide-body SOIC (package type LW). Both package types are available

in lead (Pb) free versions, with 100 % matte-tin leadframe plating

(suffix –T).

FEATURES

Drives wide range of n-channel MOSFETs

Charge pump to boost gate drive at low-battery-input conditions

Bootstrapped gate drive with charge pump for 100% duty cycle

Synchronous rectification

Fault diagnostic output

Adjustable dead-time cross-conduction protection

Motor lead short-to-battery and short-to-ground protection

Undervoltage/overvoltage protection

-40°C to +150°C, T

Thermal shutdown

ABSOLUTE MAXIMUM RATINGS

Load Supply Voltage Range, VBB,

VDRAIN, CP1 .......... -0.6 V to +40 V

Output Voltage Ranges,

LSS .............................. -2 V to +6.5 V

GHA/GHB, V

SA/SB, V

GLA/GLB, V

CA/CB, V

CP2,VCP, VIN .......... -0.6 V to +52 V

Logic Input/Output Voltage Range

V

-0.3 V to +6.5 V

Operating Temperature Range,

T

-40°C to +135°C

Junction Temperature, T

Storage Temperature Range,

T

-55°C to +150°C

* Fault conditions that produce excessive

junction temperature will activate device

thermal shutdown circuitry. These conditions

can be tolerated, but should be avoided.

A3940KLP

(TSSOP with exposed

thermal pad)

A3940KLW

(SOIC)

Approx. 2X actual size.

4

3

2

1

8

5

12

11

10

9

21

22

23

24

17

20

15

16

27

28

14

13

19

18

25

26

6

7

4

3

2

1

8

5

12

11

10

9

21

22

23

24

17

20

15

16

27

28

14

13

19

18

25

26

6

7

Part Number

Pb-free

Package

A3940KLP-T

Yes

28-pin TSSOP

A3940KLP

–

28-pin TSSOP

A3940KLW-T

Yes

28-pin SOICW

A3940KLW

–

28-pin SOICW