SA53
Switching Amplifier
RoHS
COMPLIANT
FEATURES
• Low Cost Intelligent Switching Amplifier
• Directly Connects to Most Embedded Microcontrollers and Digital Sig‐
nal Controllers
• Integrated Gate Driver Logic with Dead‐time Generation and Shoot‐
through Prevention
• Wide Power Supply Range (8.5 V To 60 V)
• Over 10A Peak Output Current per Phase
• Independent Current Sensing for each Output
• User Programmable Cycle‐by‐Cycle Current Limit Protection
• Over‐Current and Over‐Temperature Warning Signals
APPLICATIONS
• Bidirectional DC Brush Motors
• 2 Unidirectional DC Brush Motors
• 2 Independent Solenoid Actuators
• Stepper Motors
DESCRIPTION
The SA53 is a fully integrated switching amplifier designed primarily to drive DC brush motors. Two inde‐
pendent half bridges provide over 10 amperes peak output current under microcontroller or DSC control.
Thermal and short circuit monitoring is provided, which generates fault signals for the microcontroller to take
appropriate action.
Additionally, cycle‐by‐cycle current limit offers user programmable hardware protection independent of
the microcontroller. Output current is measured using an innovative low loss technique. The SA53 is built
using a multi‐technology process allowing CMOS logic control and complementary DMOS output power
devices on the same IC. Use of P‐channel high side FETs enables 60V operation without bootstrap or charge
pump circuitry.
The HSOP surface mount package balances excellent thermal performance with the advantages of a low
profile surface mount package.
Figure 1: Block Diagram
SC
TEMP
ILIM/DIS1
I1
I2
VDD
Fault
Logic
I1'
I2'
VS+
VS1 VS2
VDD VDD
PWM
Signals
DIS2
1t
1b
2t
2b
SGND
Gate
I1' I2'
Control
Control
Phase 1
Out 1
Out 2
Logic
Phase 2
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PGND 1
PGND 2
GND
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All rights reserved
Mar 2019
SA53U Rev G
