SNVSBW1C
December 2021 – August 2024
LM63440-Q1
,
LM63460-Q1
PRODUCTION DATA
1
1
Features
2
Applications
3
Description
4
Device Comparison Table
5
Pin Configuration and Functions
5.1
Wettable Flanks
5.2
Pinout Design for Clearance and FMEA
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
Timing Characteristics
6.7
Systems Characteristics
6.8
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Input Voltage Range (VIN1, VIN2)
7.3.2
Output Voltage Setpoint (FB)
7.3.3
Precision Enable and Input Voltage UVLO (EN/SYNC)
7.3.4
Frequency Synchronization (EN/SYNC)
7.3.5
Clock Locking
7.3.6
Adjustable Switching Frequency (RT)
7.3.7
Power-Good Monitor (PGOOD)
7.3.8
Bias Supply Regulator (VCC, BIAS)
7.3.9
Bootstrap Voltage and UVLO (CBOOT)
7.3.10
Spread Spectrum
7.3.11
Soft Start and Recovery From Dropout
7.3.12
Overcurrent and Short-Circuit Protection
7.3.13
Thermal Shutdown
7.3.14
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 Foldback
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
8.2
Typical Applications
8.2.1
Design 1 – Automotive Synchronous 6A Buck Regulator at 2.1MHz
8.2.1.1
Design Requirements
8.2.2
Design 2 – Automotive Synchronous 4A Buck Regulator at 2.1MHz
8.2.2.1
Design Requirements
8.2.2.2
Detailed Design Procedure
8.2.2.2.1
Custom Design With WEBENCH® Tools
8.2.2.2.2
Setting the Output Voltage
8.2.2.2.3
Choosing the Switching Frequency
8.2.2.2.4
Inductor Selection
8.2.2.2.5
Output Capacitor Selection
8.2.2.2.6
Input Capacitor Selection
8.2.2.2.7
Bootstrap Capacitor
8.2.2.2.8
VCC Capacitor
8.2.2.2.9
BIAS Power Connection
8.2.2.2.10
Feedforward Network
8.2.2.2.11
Input Voltage UVLO
8.2.2.3
Application Curves
8.2.3
Design 3 – Automotive Synchronous 6A Buck Regulator at 400kHz
8.2.3.1
Design Requirements
8.2.3.2
Detailed Design Procedure
8.2.3.3
Application Curves
8.3
Power Supply Recommendations
8.4
Layout
8.4.1
Layout Guidelines
8.4.1.1
Thermal Design and Layout
8.4.2
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
Package Options
Mechanical Data (Package|Pins)
RYF|22
MPQF610A
Thermal pad, mechanical data (Package|Pins)
Orderable Information
snvsbw1c_oa
1
Features
AEC-Q100 qualified for automotive applications
Device temperature grade 1: –40°C to +125°C ambient operating temperature
Functional Safety-Capable
Documentation available to aid functional safety system design
Versatile synchronous buck DC/DC converter
Wide input voltage range of 3V to 36V with tolerance for load-dump transients up to 42V
4A and 6A options available
1% accurate adjustable
output voltage from 1V to 95% V
IN
150°C maximum junction temperature
Frequency adjustable from 200kHz to 2.2MHz using the RT pin or a SYNC signal
Improved reliability with optimized
pinout design
and clearance for short-circuit-to-adjacent-pin test
Designed for
low EMI
requirements
Enhanced
HotRod™
QFN package with dual input paths reduces switch-node ringing
Spread spectrum
frequency modulation
Selectable FPWM or PFM mode at light loads
High efficiency across the full load range
92.5% at 13.5V
IN
, 5V
OUT
, 6A, 2.1MHz
7µA typical at 3.3V
OUT
no-load input current
0.6µA typical shutdown quiescent current
0.6V typical dropout at full load
External bias option for improved efficiency
Create a custom regulator design using the
LM634x0-Q1
with
WEBENCH®
Power Designer