3940_03 Datasheet, PDF (1/12 Pages) Allegro MicroSystems – FULL-BRIDGE POWER MOSFET CONTROLLER

3940
FULL-BRIDGE POWER MOSFET CONTROLLER
— For Automotive Applications
1
28
2
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
A3940KLP
(TSSOP with exposed
thermal pad)
1
28
2
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
A3940KLW
(SOIC)
Approx. 2X actual size.
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-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).
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.
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
Always order by complete part number
Part Number
Pb-free
A3940KLP-T
Yes
A3940KLP
–
A3940KLW-T
Yes
A3940KLW
–
Package
28-pin TSSOP
28-pin TSSOP
28-pin SOICW
28-pin SOICW