Always order by complete part number, e.g., A3940KLP .
Data Sheet
29319.100
g
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 overvoltage trip point is user adjustable.
The A3940 is supplied in a choice of two power packages, a 28-
lead TSSOP with an exposed thermal pad (suffix LP), and a 28-lead
wide-body SOIC (suffix LW).
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
J
operation
! 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
GHX
........ -2 V to +55 V
SA/SB, V
SX
.................. -2 V to +45 V
GLA/GLB, V
GLX
.......... -2 V to +16 V
CA/CB, V
CX
.............. -0.6 V to +55 V
CP2,VCP, VIN .......... -0.6 V to +52 V
Logic Input/Output Voltage Range
V
IN
, V
OUT
................... -0.3 V to +6.5 V
Operating Temperature Range,
T
A
........................... -40°C to +135°C
Junction Temperature, T
J
......... +150°C*
Storage Temperature Range,
T
S
........................... -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