SLVSHO3
April 2024
DRV8235
PRODUCTION DATA
1
1
Features
2
Applications
3
Description
4
Device Comparison
5
Pin Configuration and Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.6
I2C Timing Requirements
6.7
Timing Diagrams
6.8
Typical Operating Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
External Components
7.3.2
Summary of Features
7.3.3
Bridge Control
7.3.4
Current Sense and Regulation (IPROPI)
7.3.4.1
Current Sensing
7.3.4.2
Current Regulation
7.3.4.2.1
Fixed Off-Time Current Regulation
7.3.4.2.2
Cycle-By-Cycle Current Regulation
7.3.5
Stall Detection
7.3.6
Motor Voltage and Speed Regulation
7.3.6.1
Internal Bridge Control
7.3.6.2
Setting Speed/Voltage Regulation Parameters
7.3.6.2.1
Speed and Voltage Set
7.3.6.2.2
Speed Scaling Factor
7.3.6.2.2.1
Target Speed Setting Example
7.3.6.2.3
Motor Resistance Inverse
7.3.6.2.4
Motor Resistance Inverse Scale
7.3.6.2.5
KMC Scaling Factor
7.3.6.2.6
KMC
7.3.6.2.7
VSNS_SEL
7.3.6.3
Soft-Start and Soft-Stop
7.3.6.3.1
TINRUSH
7.3.7
Protection Circuits
7.3.7.1
Overcurrent Protection (OCP)
7.3.7.2
Thermal Shutdown (TSD)
7.3.7.3
VM Undervoltage Lockout (VM UVLO)
7.3.7.4
Overvoltage Protection (OVP)
7.3.7.5
nFAULT Output
7.4
Device Functional Modes
7.4.1
Active Mode
7.4.2
Low-Power Sleep Mode
7.4.3
Fault Mode
7.5
Programming
7.5.1
I2C Communication
7.5.1.1
I2C Write
7.5.1.2
I2C Read
8
Register Map
8.1
DRV8235_STATUS Registers
8.2
DRV8235_CONFIG Registers
8.3
DRV8235_CTRL Registers
9
Application and Implementation
9.1
Application Information
9.2
Typical Application: Brushed DC Motor
9.2.1
Design Requirements
9.2.2
Stall Detection
9.2.2.1
Application Description
9.2.2.1.1
Stall Detection Timing
9.2.2.1.2
Hardware Stall Threshold Selection
9.2.3
Motor Speed and Voltage Regulation Application
9.2.3.1
Tuning Parameters
9.2.3.1.1
Resistance Parameters
9.2.3.1.2
KMC and KMC_SCALE
9.2.3.1.2.1
Case I
9.2.3.1.2.2
Case II
9.2.3.1.2.2.1
Method 1: Tuning from Scratch
9.2.3.1.2.2.1.1
Tuning KMC_SCALE
9.2.3.1.2.2.1.2
Tuning KMC
9.2.3.1.2.2.2
Method 2: Using the Proportionality factor
9.2.3.1.2.2.2.1
Working Example
9.2.4
Motor Voltage
9.2.5
Motor Current
9.3
Power Supply Recommendations
9.3.1
Bulk Capacitance
9.4
Layout
9.4.1
Layout Guidelines
10
Device and Documentation Support
10.1
Receiving Notification of Documentation Updates
10.2
Support Resources
10.3
Trademarks
10.4
Electrostatic Discharge Caution
10.5
Glossary
11
Revision History
12
Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
RTE|16
MPQF149D
Thermal pad, mechanical data (Package|Pins)
RTE|16
QFND525B
Orderable Information
slvsho3_oa
slvsho3_pm
1
Features
N-channel H-bridge brushed DC motor driver
4.5V to 38V
operating supply voltage range
Integrated
Voltage
and
Speed regulation
Soft-Start and Stop
feature for inrush current protection
600mΩ
R
DS(on)
(High-Side + Low-Side)
High output current capability: 3.7A Peak, 2A RMS
PWM with I
2
C control interface
Configuration and diagnostics on I
2
C registers
Multi-follower operation support
Supports standard and fast I
2
C mode
Supports 3.3V, and 5V logic inputs
Integrated current sensing and current regulation
Analog current sense output (IPROPI)
Internal charge pump with 100% duty cycle
Long battery life with low-power sleep mode
< 1μA maximum sleep current
Small package and footprint
16-Pin WQFN with
PowerPAD™
, 3 × 3mm
Integrated protection features
VM undervoltage lockout (UVLO)
Overcurrent protection (OCP)
Thermal shutdown (TSD)
Stall detection
Overvoltage protection (OVP)