MOSFET Driver. A4940 Datasheet

A4940 Driver. Datasheet pdf. Equivalent

A4940 Datasheet
Recommendation A4940 Datasheet
Part A4940
Description Automotive Full Bridge MOSFET Driver
Feature A4940; A4940 Automotive Full Bridge MOSFET Driver www.datasheet4u.com Features and Benefits ▪ High current.
Manufacture Allegro Micro Systems
Datasheet
Download A4940 Datasheet




Allegro Micro Systems A4940
A4940
Automotive Full Bridge MOSFET Driver
Features and Benefits
www.dataHsihgehetc4uur.creonmt gate drive for N-channel MOSFET full bridge
Independent control of each MOSFET
Charge pump for low supply voltage operation
Cross-conduction protection with adjustable dead time
5.5 to 50 V supply voltage range
Diagnostics output
Low current sleep mode
Package: 24-pin TSSOP with exposed
thermal pad (suffix LP)
Not to scale
Description
The A4940 is a full-bridge controller for use with external
N-channel power MOSFETs and is specifically designed for
automotive applications with high-power inductive loads such
as brush DC motors.
A unique charge pump regulator provides full ( >10 V ) gate
drive for battery voltages down to 7 V and allows the A4940
to operate with a reduced gate drive, down to 5.5 V.
A bootstrap capacitor is used to provide the above battery
supply voltage required for N-channel MOSFETs. A unique
bootstrap charge management system ensures that the bootstrap
capacitor is always sufficiently charged to supply the high-side
gate drive circuit.
Each of the power MOSFETs is controlled independently but
all are protected from shoot-through by dead time that is user-
configured by an external resistor.
Integrated diagnostics provide indication of undervoltage and
overtemperature faults.
The A4940 is supplied in a 24-pin TSSOP power package with
an exposed pad for enhanced thermal dissipation (package
type LP). It is lead (Pb) free, with 100% matte tin leadframe
plating (suffix –T).
A4940-DS
FAULT
AHI
BHI
ALO
BLO
Typical Application
A4940
VBAT
M



Allegro Micro Systems A4940
A4940
Automotive Full Bridge MOSFET Driver
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Part Number
A4940KLPTR-T
Packing
4000 pieces per reel
Absolute Maximum Ratings*
Characteristic
Load Supply Voltage
Logic Supply Voltage
Logic Inputs
Logic Outputs
Pin VREG
Pins CP1, CP2
Pin RDEAD
Pins SA, SB
Pins GHA, GHB
Pins GLA, GLB
Pins CA, CB
ESD Rating, Human Body Model
ESD Rating, Charged Device Model
Ambient Operating Temperature
Range
Continuous Junction Temperature
Transient Junction Temperature
Storage Temperature Range
*With respect to ground
Symbol
VBB
VDD
VI
VO
VVREG
VCPX
VRDEAD
VSX
VGHX
VGLX
VCX
TA
TJ(max)
TJt
Tstg
Notes
AEC Q100-002, all pins
AEC Q100-011, all pins
Range K
Overtemperature event not exceeding
10 s, lifetime duration not exceeding 10 hr,
guaranteed by design characterization
Rating
–0.3 to 50
–0.3 to 7
–0.3 to 6.5
–0.3 to 6.5
–0.3 to 16
–0.3 to 16
–0.3 to 6.5
–5 to 55
VSX to VSX + 15
–5 to 16
–0.3 to VSX+15
2000
1000
–40 to 150
150
175
–55 to 150
Unit
V
V
V
V
V
V
V
V
V
V
V
V
V
°C
°C
°C
°C
Thermal Characteristics may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions*
Package Thermal Resistance, Junc-
tion to Ambient
On 4-layer PCB based on JEDEC standard
RθJA On 2-layer PCB with 3.8 in.2 of copper area each side
Package Thermal Resistance, Junc-
tion to Pad
RθJP
*Additional thermal information available on the Allegro website
Value Unit
28 ºC/W
100 ºC/W
2 ºC/W
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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Allegro Micro Systems A4940
A4940
Automotive Full Bridge MOSFET Driver
www.datasheet4u.com
Functional Block Diagram
Battery +
VDD
FAULT
AHI
ALO
BHI
BLO
RESET
VBB
Diagnostics &
Protection
CP
CP2 CP1
Charge
Pump
Regulator
VREG
CREG
Bootstrap
Monitor
CA
CBOOTA
High
Side
GHA
SA
RGHA
Control
Logic
Low
Side
GND
GLA
RGLA
Bootstrap
Monitor
CB
CBOOTB
High
Side
GHB
SB
RDEAD
Low
Side
GLB
AGND GND
GND
Thermal Pad
VBAT
RGHB
RGLB
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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