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LMR36503E-Q1 3V to 65V, 0.3A, Automotive, Grade 0, Synchronous Buck Converter Optimized for Size and Light Load Efficiency
SNVSCI9A
June 2024 – September 2024
LMR36503E-Q1
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LMR36503E-Q1 3V to 65V, 0.3A, Automotive, Grade 0, Synchronous Buck Converter Optimized for Size and Light Load Efficiency
1
1
Features
2
Applications
3
Description
4
Device Comparison Table
5
Pin Configuration and Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD (Automotive) Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.6
System Characteristics
6.7
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Enable, Start-Up, and Shutdown
7.3.2
External CLK SYNC (with MODE/SYNC)
7.3.2.1
Pulse-Dependent MODE/SYNC Pin Control
7.3.3
Adjustable Switching Frequency (with RT)
7.3.4
Power-Good Output Operation
7.3.5
Internal LDO, VCC UVLO, and VOUT/BIAS Input
7.3.6
Bootstrap Voltage and VCBOOT-UVLO (CBOOT Terminal)
7.3.7
Output Voltage Selection
7.3.8
Soft Start and Recovery from Dropout
7.3.8.1
Recovery from Dropout
7.3.9
Current Limit and Short Circuit
7.3.10
Thermal Shutdown
7.3.11
Input Supply Current
7.4
Device Functional Modes
7.4.1
Shutdown Mode
7.4.2
Standby Mode
7.4.3
Active Mode
7.4.3.1
CCM Mode
7.4.3.2
Auto Mode - Light Load Operation
7.4.3.2.1
Diode Emulation
7.4.3.2.2
Frequency Reduction
7.4.3.3
FPWM Mode - Light Load Operation
7.4.3.4
Minimum On-Time (High Input Voltage) Operation
7.4.3.5
Dropout
8
Application and Implementation
8.1
Application Information
8.1.1
High Temperature Specifications
8.2
Typical Application
8.2.1
Design Requirements
8.2.2
Detailed Design Procedure
8.2.2.1
Custom Design With WEBENCH® Tools
8.2.2.2
Choosing the Switching Frequency
8.2.2.3
Setting the Output Voltage
8.2.2.3.1
FB for Adjustable Output
8.2.2.4
Inductor Selection
8.2.2.5
Output Capacitor Selection
8.2.2.6
Input Capacitor Selection
8.2.2.7
CBOOT
8.2.2.8
VCC
8.2.2.9
CFF Selection
8.2.2.9.1
External UVLO
8.2.2.10
Maximum Ambient Temperature
8.2.3
Application Curves
8.3
Best Design Practices
8.4
Power Supply Recommendations
8.5
Layout
8.5.1
Layout Guidelines
8.5.1.1
Ground and Thermal Considerations
8.5.2
Layout Example
9
Device and Documentation Support
9.1
Device Support
9.1.1
Third-Party Products Disclaimer
9.1.2
Development Support
9.1.2.1
Custom Design With WEBENCH® Tools
9.2
Documentation Support
9.2.1
Related Documentation
9.3
Receiving Notification of Documentation Updates
9.4
Support Resources
9.5
Trademarks
9.6
Electrostatic Discharge Caution
9.7
Glossary
10
Revision History
11
Mechanical, Packaging, and Orderable Information
11.1
Tape and Reel Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
RPE|9
MPQF528A
Thermal pad, mechanical data (Package|Pins)
Orderable Information
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Data Sheet
LMR36503E-Q1
3V to 65V,
0.3A
,
Automotive, Grade 0, Synchronous Buck Converter Optimized for Size and Light Load Efficiency
1
Features
AEC-Q100-qualified for automotive applications:
Device temperature grade 0: –40°C to +150°C, T
A
> 70%
efficiency at
5mA
4µA I
Q
(switching) at 24V
IN
to 3.3V
OUT
(fixed output option)
Miniature design size and low component cost
2mm × 2mm
HotRod™
package with wettable flanks
Internal compensation
Designed for automotive applications:
Junction temperature range –40°C to +175°C
Pseudo-random spread spectrum compatible with
CISPR 25 EMI standard
Wide input voltage range: 3V (falling threshold) to 65V
Adjustable and 3.3V fixed output voltage options available
Synchronizable with MODE/SYNC pin variant
Adjustable F
SW
: 200kHz to 2.2MHz with RT pin variant
Functional Safety-Capable
Documentation available to aid designs requiring functional safety
Pin compatible with
LMR36503-Q1
(65V, 300mA)
Create a custom design using the LMR36503E-Q1 with the
WEBENCH®
Power Designer
2
Applications
Advanced driver assistance systems (ADAS)
Body electronics and lighting
Infotainment and cluster