LMR14206XMKX/NOPB

LMR14206 SNVS733D – OCTOBER 2011 – REVISED APRIL 2013 LMR14206 SIMPLE SWITCHER® 42Vin, 0.6A Step-Down Voltage Regulator in SOT-23 Check for Samples: LMR14206 All trademarks are the property of their respective owners. 1 Features 4 Description • • • • • • • • • • The LMR14206 is a PWM DC/DC buck (step-down) regulator. With a wide input range from 4.5V-42V, they are suitable for a wide range of applications such as power conditioning from unregulated sources. They feature a low RDSON (0.9Ω typical) internal switch for maximum efficiency (85% typical). Operating frequency is fixed at 1.25 MHz allowing the use of small external components while still being able to have low output voltage ripple. Soft-start can be implemented using the shutdown pin with an external RC circuit allowing the user to tailor the softstart time to a specific application. 1 Input Voltage Range of 4.5V to 42V Output Voltage Range of 0.765V to 34V Output Vurrent up to 0.6A 1.25 MHz Switching Frequency Low Shutdown Iq, 16 µA Typical Short Circuit Protected Internally Compensated Soft-Start Function Thin 6-Pin SOT Package (2.97 x 1.65 x 1mm) Fully Enabled for WEBENCH® Power Designer 2 Performance Benefits • • • Tight Accuracy for Powering Digital ICs Extremely Easy to Use Tiny Overall Solution Reduces System Cost The LMR14206 is optimized for up to 600 mA load current with a 0.765V nominal feedback voltage. Additional features include: thermal shutdown, VIN under-voltage lockout, and gate drive under-voltage lockout. The LMR14206 is available in a low profile 6pin SOT package. 3 Applications • • • • • • Point-of-Load Conversions from 5V, 12V, and 24V Rails Space Constrained Applications Battery Powered Equipment Industrial Distributed Power Applications Power Meters Portable Hand-Held Instruments 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. LMR14206 SNVS733D – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com 4.1 System Performance Efficiency vs Load Current VIN = 24V, VOUT = 1.2V and 3.3V 100 100 90 90 80 80 EFFICIENCY (%) EFFICIENCY (%) Efficiency vs Load Current VIN = 12V, VOUT = 1.2V and 3.3V 70 60 50 40 30 20 60 50 40 30 20 10 10 1.2Vout 3.3Vout 0 0.0 70 0.1 1.2Vout 3.3Vout 0 0.2 0.3 0.4 0.5 LOAD CURRENT (A) 0.6 0.0 CBOOT 0.1 L1 0.2 0.3 0.4 0.5 LOAD CURRENT (A) 0.6 VOUT LMR14206 VIN VIN CB SHDN SW GND FB D1 R1 R2 CIN COUT Figure 1. 4.2 Connection Diagram LMR14206 CB 1 GND 2 6 SW 5 VIN 4 SHDN PIN 1 ID FB 3 Figure 2. 6-Pin SOT (Top View) See DDC Package 2 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Product Folder Links: LMR14206 LMR14206 www.ti.com SNVS733D – OCTOBER 2011 – REVISED APRIL 2013 Connection Diagram (continued) PIN DESCRIPTIONS Pin Name 1 CB 2 GND 3 FB 4 SHDN Function SW FET gate bias voltage. Connect CBOOT cap between CB and SW. Ground connection. Feedback pin: Set feedback voltage divider ratio with VOUT = VFB (1+(R1/R2)). Resistors should be in the 100-10K range to avoid input bias errors. Logic level shutdown input. Pull to GND to disable the device and pull high to enable the device. If this function is not used tie to VIN or leave open. 5 VIN Power input voltage pin: 4.5V to 42V normal operating range. 6 SW Power FET output: Connect to inductor, diode, and CBOOT cap. Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Product Folder Links: LMR14206 3 LMR14206 SNVS733D – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. 5 Absolute Maximum Ratings (1) (2) VIN -0.3V to +45V SHDN -0.3V to (VIN+0.3V)