SNVSBW1B
December 2021 – October 2023
LM63460-Q1
PRODUCTION DATA
1
1
Features
2
Applications
3
Description
4
Revision History
5
Device Comparison Table
6
Pin Configuration and Functions
6.1
Wettable Flanks
6.2
Pinout Design for Clearance and FMEA
7
Specifications
7.1
Absolute Maximum Ratings
7.2
ESD Ratings
7.3
Recommended Operating Conditions
7.4
Thermal Information
7.5
Electrical Characteristics
7.6
Timing Characteristics
7.7
Systems Characteristics
7.8
Typical Characteristics
8
Detailed Description
8.1
Overview
8.2
Functional Block Diagram
8.3
Feature Description
8.3.1
Input Voltage Range (VIN1, VIN2)
8.3.2
Output Voltage Setpoint (FB)
8.3.3
Precision Enable and Input Voltage UVLO (EN/SYNC)
8.3.4
Frequency Synchronization (EN/SYNC)
8.3.5
Clock Locking
8.3.6
Adjustable Switching Frequency (RT)
8.3.7
Power-Good Monitor (PGOOD)
8.3.8
Bias Supply Regulator (VCC, BIAS)
8.3.9
Bootstrap Voltage and UVLO (CBOOT)
8.3.10
Spread Spectrum
8.3.11
Soft Start and Recovery From Dropout
8.3.12
Overcurrent and Short-Circuit Protection
8.3.13
Thermal Shutdown
8.3.14
Input Supply Current
8.4
Device Functional Modes
8.4.1
Shutdown Mode
8.4.2
Standby Mode
8.4.3
Active Mode
8.4.3.1
CCM Mode
8.4.3.2
AUTO Mode – Light-Load Operation
8.4.3.2.1
Diode Emulation
8.4.3.2.2
Frequency Foldback
8.4.3.3
FPWM Mode – Light-Load Operation
8.4.3.4
Minimum On-Time (High Input Voltage) Operation
8.4.3.5
Dropout
9
Application and Implementation
9.1
Application Information
9.2
Typical Applications
9.2.1
Design 1 – Automotive Synchronous Buck Regulator at 2.1 MHz
9.2.1.1
Design Requirements
9.2.1.2
Detailed Design Procedure
9.2.1.2.1
Custom Design With WEBENCH® Tools
9.2.1.2.2
Setting the Output Voltage
9.2.1.2.3
Choosing the Switching Frequency
9.2.1.2.4
Inductor Selection
9.2.1.2.5
Output Capacitor Selection
9.2.1.2.6
Input Capacitor Selection
9.2.1.2.7
Bootstrap Capacitor
9.2.1.2.8
VCC Capacitor
9.2.1.2.9
BIAS Power Connection
9.2.1.2.10
Feedforward Network
9.2.1.2.11
Input Voltage UVLO
9.2.1.3
Application Curves
9.2.2
Design 2 – Automotive Synchronous Buck Regulator at 400 kHz
9.2.2.1
Design Requirements
9.2.2.2
Detailed Design Procedure
9.2.2.3
Application Curves
9.3
Power Supply Recommendations
9.4
Layout
9.4.1
Layout Guidelines
9.4.1.1
Thermal Design and Layout
9.4.2
Layout Example
10
Device and Documentation Support
10.1
Device Support
10.1.1
Third-Party Products Disclaimer
10.1.2
Development Support
10.1.2.1
Custom Design With WEBENCH® Tools
10.2
Documentation Support
10.2.1
Related Documentation
10.3
Receiving Notification of Documentation Updates
10.4
Support Resources
10.5
Trademarks
10.6
Electrostatic Discharge Caution
10.7
Glossary
11
Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
RYF|22
MPQF610A
Thermal pad, mechanical data (Package|Pins)
Orderable Information
snvsbw1b_oa
snvsbw1b_pm
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 3 V to 36 V with tolerance for load-dump transients up to 42 V
1% accurate adjustable
output voltage from 1 V to 95% V
IN
150°C maximum junction temperature
Frequency adjustable from 200 kHz to 2.2 MHz using the RT pin or a SYNC signal
Improved reliability with optimized
pinout design
and clearance for short-circuit-to-adjacent-pin test
Optimized 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 13.5 V
IN
, 5 V
OUT
, 6 A, 2.1 MHz
No-load input current: 7-µA typical at 3.3 V
OUT
Shutdown quiescent current: 0.6-µA typical
0.6-V typical dropout at 6-A load
External bias option for improved efficiency
Create a custom regulator design using the LM63460-Q1 with
WEBENCH®
Power Designer