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A4939 Datasheet Preview

A4939 Datasheet

Automotive Three Phase MOSFET Driver

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A4939
Automotive Three Phase MOSFET Driver
FEATURES AND BENEFITS
• High current 3-phase gate drive for N-channel MOSFETs
• Cross-conduction protection
• 5.5 to 50 V supply voltage range
• Regulated logic supply voltage output option
• Motor phase short to supply and short to ground detection
• Undervoltage, overtemperature monitors
• Low current Sleep mode option
APPLICATIONS
• Electronic power steering (EPS, EHPS, EAS)
• Hydraulic pumps
• Engine cooling fan
• Gearbox actuator
PACKAGES
Not to scale
28-pin TSSOP
with exposed thermal pad
(LP package)
28-contact QFN
5 mm × 5 mm × 0.85 mm
(JET package)
DESCRIPTION
The A4939 is a three-phase controller for use with N-channel
external power MOSFETs and is specifically designed for
automotive applications.
A unique charge pump regulator provides full (>10 V) gate
drive at battery voltages down to 7 V and allows the A4939
to operate with reduced gate drive at battery voltages down
to 5.5 V. A bootstrap capacitor is used to provide the above
battery supply voltage required for N-channel MOSFETs.
One logic level input is provided for each of the six power
MOSFETs in the 3-phase bridge, allowing motors to be driven
with any commutation scheme defined by an external controller.
The power MOSFETs are protected from cross-conduction by
integrated crossover control.
Motor phase short-to-supply and short-to-ground detection
is provided by independent drain-source voltage monitors on
each MOSFET. Short faults, supply undervoltage, and chip
overtemperature conditions are indicated by a single open
drain fault output.
Product variants incorporating a low drop out (LDO) regulator
to source either 5.0 V or 3.3 V to external circuitry are available.
All A4939 variants are available in a 28-pin TSSOP power
package with an exposed thermal pad (package type LP) or a
28-pin wettable flank QFN package with an exposed thermal
pad (package type JET). Both packages are lead (Pb) free,
with 100% matte-tin leadframe plating (suffix T).
Typical Application Diagram
VDD
VBAT
Micro-
controller
A4939
3-Phase
BLDC
Motor
A4939-DS, Rev. 3
MCO-0000784
February 13, 2020




Allegro

A4939 Datasheet Preview

A4939 Datasheet

Automotive Three Phase MOSFET Driver

No Preview Available !

A4939
Automotive Three Phase MOSFET Driver
Selection Guide
Part Number
A4939KLPTR-T
A4939KLPTR-3-T
A4939KLPTR-5-T
A4939KETTR-T
A4939KETTR-3-T
A4939KETTR-5-T
Sleep Mode
Yes
Yes
Regulator
3.3 V
5V
3.3 V
5V
Packing
Package
4000 pieces per 13-in. reel
9.7 mm × 4.4 mm, 1.2 mm nominal height
28-pin TSSOP with exposed thermal pad
7000 pieces per 13-in. reel
5 mm x 5 mm, 0.85 mm nominal height,
28-pin wettable flank QFN with exposed
thermal pad
Table of Contents
Specifications
Absolute Maximum Ratings
Thermal Characteristics
Pin-out Diagram and Terminal Lists
Functional Block Diagram
Electrical Characteristics
Functional Description
Input and Output Terminal Functions
Power Supplies
CP1,CP2, VREG
Sleep Mode
Gate Drives
High-Side Gate Drives (GHA, GHB, GHC)
Bootstrap Charge Management
Low-side Gate Drive (GLA, GLB, GLC)
Drain Source Voltage Monitor
Logic Control Inputs
Diagnostics
Fault States
Low Drop Out (LDO) Regulator
Applications Information
Power Bridge Management Using PWM Control
Bootstrap Capacitor Selection
Bootstrap Charging
VREG Capacitor Selection
LDO Regulator Capacitor Selection
Supply Decoupling
Input/Output Structures
Layout Recommendations
Package Outline Drawing
3
3
3
4
5
6
9
9
10
10
10
10
10
10
11
11
12
12
12
14
15
15
15
16
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19
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
2


Part Number A4939
Description Automotive Three Phase MOSFET Driver
Maker Allegro
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A4939 Datasheet PDF






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