LM3489EVAL

User's Guide SNVA160A – May 2006 – Revised April 2013 AN-1471 LM3489 Demonstration Board 1 Introduction The LM3489 is a high efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, cost effective, switching buck regulator for a wide range of applications. The hysteretic control architecture provides for simple design without any control loop stability concerns using a wide variety of external components. The PFET architecture also allows for low component count as well as ultra-low dropout, and 100% duty cycle operation. Another benefit is high efficiency operation at light loads without an increase in output ripple. A dedicated Enable Pin (enabled if left unconnected) provides a shutdown mode drawing only 7 µA. The current limit protection can be implemented by measuring the voltage across the PFET’s RDS(ON), thus, eliminating the need for a sense resistor. The cycle-by-cycle current limit can be adjusted with a single resistor, ensuring safe operation over a range of output currents. This LM3489 demonstration board provides a 3.3 V output with 500 mA nominal load capability (maximum 1A) from a wide input voltage range of 7 V to 28 V. The reference design is optimized for overall conversion efficiency. This document contains the demo board schematic, PCB layout, Bill of Materials (BOM) and typical operating waveforms are provided for reference. 2 Evaluation Board Schematic Figure 1. LM3489 Evaluation Board Schematic All trademarks are the property of their respective owners. SNVA160A – May 2006 – Revised April 2013 Submit Documentation Feedback AN-1471 LM3489 Demonstration Board Copyright © 2006–2013, Texas Instruments Incorporated 1 Demonstration Board PCB Layout www.ti.com Table 1. Bill of Materials (BOM) Label Description CIN1 Tantalum Capacitor 22µF 35V EEJL1VD226R Manufacturer Panasonic Tantalum Capacitor 22µF 35V 293D226X0035E CIN2 0603 Ceramic Chip Capacitor 0.1µF 50V ECJ1VB1H104K COUT Low ESR Capacitor, POSCAP 100µF 6.3V 6TPC100M CADJ 0603 Ceramic Chip 1nF 50V ECJ1VB1H102K Cff Vishay Panasonic Sanyo Panasonic 0603 Ceramic Chip 1nF 50V VJ0805A102KXAA Vishay 0805 Ceramic Chip 100pF 50V ECJ1VC1H101J Panasonic 0805 Ceramic Chip 100pF 50V VJ0805A101KXAA D1 Vishay Schottky Diode 1A 40V MBRS140T3 ON Semiconductor Schottky Diode 1A 40V CMSH1-40 L Central Semi Inductor 22µH LQH66SN220M03L M1 P-channel MOSFET 60V FDC5614P R1 0805 Chip Resistor 33kΩ CRCW08053302F Murata Fairchild Vishay 0805 Chip Resistor 33kΩ ERJ3GEYF333 R2 Panasonic 0805 Chip Resistor 20kΩ CRCW08052002F Vishay 0805 Chip Resistor 20kΩ ERJ3GEYF203 RADJ Panasonic 0603 Chip Resistor 24kΩ CRCW08052402F Vishay 0603 Chip Resistor 24kΩ ERJ3GEYF243 RIS Panasonic 0603 Chip Resistor 270Ω CRCW08052700F Vishay 0603 Chip Resistor 270Ω ERJ3GEYF271 U1 3 Panasonic Buck Controller With ENABLE PIN LM3489 Texas Instruments Demonstration Board PCB Layout Figure 2. LM3489 Demonstration Board PCB Top Overlay 2 AN-1471 LM3489 Demonstration Board Copyright © 2006–2013, Texas Instruments Incorporated SNVA160A – May 2006 – Revised April 2013 Submit Documentation Feedback Demonstration Board PCB Layout www.ti.com Figure 3. LM3489 Demonstration Board PCB Top Layer Layout Figure 4. LM3489 Demonstration Board PCB Bottom Layer Layout SNVA160A – May 2006 – Revised April 2013 Submit Documentation Feedback AN-1471 LM3489 Demonstration Board Copyright © 2006–2013, Texas Instruments Incorporated 3 Demonstration Board Quick Setup Procedures 4 Demonstration Board Quick Setup Procedures Step 5 Description Notes 1 Connect power supply to VIN terminals 2 Connect load to the VOUT terminals 3 SD jumper should left open for normal operation -Short this jumper to shutdown 4 Set VIN = 12V, with no load applied, check VOUT with voltmeter 3.3 V ±100 mV 5 Apply 500 mA load and check VOUT again 3.3 V ±100 mV 6 Short output terminals and check short circuit current with an ammeter 7 Short SD jumper to check for shutdown function VIN range 7 V to 28V IOUT range 0A to 500 mA Nominal 1.4A Demonstration Board Performance Characteristic Description Symbol Input Voltage VIN Condition Min Typical Max Unit 7 12 28 V V Output Voltage VOUT 3.2 3.3 3.4 Output Current IOUT 0 0.5 1 A 20 MHz Bandwidth limit - - 40 mVP-P All VIN and IOUT conditions 1.5 1.5 % VIN = 7 V VIN = 28 V (IOUT = 100 mA to 500 mA) 88 73 90 80 % Output Voltage Ripple Output Voltage Regulation VOUT(Ripple) ΔVOUT Efficiency Output Short Current Limit 4 www.ti.com ILIM-SC 1.4 AN-1471 LM3489 Demonstration Board Copyright © 2006–2013, Texas Instruments Incorporated A SNVA160A – May 2006 – Revised April 2013 Submit Documentation Feedback Output Voltage and Current Limit Setting www.ti.com 6 Output Voltage and Current Limit Setting SNVA160A – May 2006 – Revised April 2013 Submit Documentation Feedback AN-1471 LM3489 Demonstration Board Copyright © 2006–2013, Texas Instruments Incorporated 5 Typical Performance and Waveforms 7 www.ti.com Typical Performance and Waveforms All curves taken at VIN = 12 V with the demonstration board for VOUT = 3.3 V. TJ = 25°C, unless otherwise specified. Efficiency vs Load Current VOUT Regulation vs Load Current 100 1.0 VIN = 7V VIN = 28V VIN = 18V 0.5 80 70 'VOUT (%) EFFICIENCY (%) 90 VIN = 12V VIN = 28V VIN = 18V 0.0 VIN = 7V 60 VIN = 12V -0.5 50 40 0.1 0.2 0.3 0.4 0.5 0.6 -1.0 0.1 OUTPUT CURRENT (A) Continuous Mode Operation 0.2 0.4 0.5 0.6 OUTPUT CURRENT (A) Discontinuous Mode Operation VOUT RIPPLE (50 mVac/Div) Switch Node Voltage, VD1 (10V/Div) 0.3 VOUT RIPPLE (20 mVac/Div) Switch Node Voltage, VD1 (10V/Div) IL (1A/Div) IL (500 mA/Div) TIME (2 Ps/DIV) 6 AN-1471 LM3489 Demonstration Board Copyright © 2006–2013, Texas Instruments Incorporated TIME (4 Ps/DIV) SNVA160A – May 2006 – Revised April 2013 Submit Documentation Feedback Typical Performance and Waveforms www.ti.com Load Transient (VOUT = 3.3V, 50mA - 500mA Load) Power Up Enable TransientLoad Transient (VOUT = 3.3V, 500mA Loaded) Shutdown Transient (VOUT = 3.3V, 500mA Loaded) SNVA160A – May 2006 – Revised April 2013 Submit Documentation Feedback AN-1471 LM3489 Demonstration Board Copyright © 2006–2013, Texas Instruments Incorporated 7 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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