A3998_16 Datasheet, PDF (2/20 Pages) Allegro MicroSystems – Dual DMOS Full Bridge Motor Driver With Serial Port Control and Dual Regulators

A3998
Dual DMOS Full Bridge Motor Driver
With Serial Port Control and Dual Regulators
Selection Guide
Part Number
Packing*
A3998SETTR-T
1500 pieces per 7-in. reel
*Contact Allegro^™ for additional packing options
Absolute Maximum Ratings*
Characteristic
Load Supply Voltage
Output Current
Sense Voltage
SW1 Pin Voltage
Logic Pins Voltage Range
VIN Pin Voltage
FB Pins Voltage Range
VREF Pin Voltage Range
PMON, RST Pins Voltage Range
VREG Pin Voltage Range
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
V_BB
I_OUT
V_SENSE
V_SW
V_IO
V_IN
V_FB
V_REF
V_RST
V_REG
T_A
T_J(max)
T_stg
Notes
Motor, DC
Pulsed, t_W < 1 μs
DC
t_W < 1 μs
S temperature range
Rating
50
1.5
6
0.52
2.5
–1 to 50
–0.3 to 5.5
–0.3 to 6
–0.3 to 5.5
–0.3 to 5.5
–0.3 to 5.5
–0.3 to 8
–20 to 85
150
–55 to 150
Thermal Characteristics may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions*
Package Thermal Resistance
4-layer PCB based on JEDEC standard
R_θJA
Estimated, on 2-layer PCB with 1 in.² of copper area each side
*Additional thermal information available on the Allegro website
Unit
V
A
A
V
V
V
V
V
V
V
V
V
ºC
ºC
ºC
Value Unit
30 ºC/W
55 ºC/W
Table of Contents
Specifications
2
Pin-out Diagram and Terminal List
2
Thermal Characteristics
Terminal List
3
Electrical Characteristics
4
Functional Description
7
Voltage Regulators
7
Switching Regulator
7
Linear Regulator
8
Serial Port
8
Serial Port Writing
8
Configuration Register
9
Motor Driver
9
Full Bridge Output Current Regulation
9
Fixed Off-Time
9
PWM Control Mode
9
Phase Control
10
Enable Logic
10
Fast Decay Time
10
PWM Blank Timer
10
Synchronous Rectification
10
Protection
11
Power-On Reset
11
Application Information
16
PCB Layout
16
Switcher
16
Motor Driver
16
Thermal Considerations
16
Switching Regulator Component Selection
16
Package Outline Drawing
19
Allegro MicroSystems, LLC
2
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com