SNVA870A
March 2019 – April 2020
LM25143
,
LM25143-Q1
,
LM5143
,
LM5143-Q1
,
LM5143A-Q1
LM5143-Q1 4-phase Buck Regulator Design for Automotive ADAS Applications
Trademarks
1
High Density Reference Design Description
1.1
Typical Applications
1.2
Features and Electrical Performance
2
Design Specifications
3
Application Circuit Diagram
4
Photo
5
Test Data and Performance Curves
5.1
Conversion Efficiency
6
EVM Documentation
6.1
Schematic
6.2
Bill of Materials
6.3
PCB Layout
7
Device and Documentation Support
7.1
Device Support
7.1.1
Development Support
7.2
Documentation Support
7.2.1
Related Documentation
7.2.1.1
PCB Layout Resources
7.2.1.2
Thermal Design Resources
Revision History
1.2
Features and Electrical Performance
Tightly-regulated output voltage of 5 V with better than ±1% setpoint accuracy
Wide input voltage operating range of 8 V to 18 V (with transients from 6 V to 36 V)
Single--output configurations
Single output, four-phase solution provides 30 A
Switching frequency of 2.1 MHz externally synchronizable up or down by 20%
Ultra-high power conversion efficiency across wide load current ranges
Half-load efficiency of 92.3% at V
IN
= 12 V
Full-load efficiency of 91.75% at V
IN
= 12 V
Input π-stage EMI filter with electrolytic capacitor for parallel damping
Two-stage differential-mode EMI filter
Meets CISPR 25 and UNECE Reg 10 EMI standards
Peak current-mode control architecture provides fast line and load transient response
Integrated slope compensation adaptive with switching frequency
Forced PWM (FPWM) or diode emulation mode (DEM) operation
Integrated high-side and low-side power MOSFET gate drivers
3.25-A and 4.25-A sink/source gate drive current capability
Independent source and sink gate driver pins for adjustable switch (SW) voltage slew rate
14-ns adaptive dead-time control reduces power dissipation and MOSFET temperature rise
Overcurrent protection (OCP) with shunt or inductor DCR current sensing
Monotonic prebias output voltage startup
User-adjustable soft-start time set to 3 ms by 100-nF capacitors connected between SS pins and AGND
SYNCOUT signal 90° out-of-phase with internal clock
Power Good indicator with 100-kΩ pullup resistors to VCC
Fully assembled, tested, and proven PCB layout with 105-mm × 75-mm total footprint
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