LMR14203XMKX

LMR14203 www.ti.com SNVS732C – OCTOBER 2011 – REVISED APRIL 2013 LMR14203 SIMPLE SWITCHER® 42Vin, 0.3A Step-Down Voltage Regulator in SOT-23 Check for Samples: LMR14203 FEATURES DESCRIPTION • • • • • • • • • • The LMR14203 is a PWM DC/DC buck (step-down) regulator. With a wide input range from 4.5V-42V, it is 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 soft-start time to a specific application. 1 2 Input Voltage Range of 4.5V to 42V Output Voltage Range of 0.765V to 34V Output Current up to 0.3A 1.25 MHz Switching Frequency Low Shutdown Iq, 16 µA Typical Short Circuit Protected Internally Compensated Soft-Start Function Thin SOT-23-6 Package (2.97 x 1.65 x 1mm) Fully Enabled for WEBENCH® Power Designer PERFORMANCE BENEFITS • • • Tight Accuracy for Powering Digital ICs Extremely Easy to Use Tiny Overall Solution Reduces System Cost The LMR14203 is optimized for up to 300 mA load current. Additional features include: thermal shutdown, VIN under-voltage lockout, and gate drive under-voltage lockout. The LMR14203 is available in a low profile SOT-6L package. 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 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 10 0 0.00 70 60 50 40 30 20 10 1.2Vout 3.3Vout 0.05 0.10 0.15 0.20 0.25 LOAD CURRENT (A) 0 0.30 0.00 1.2Vout 3.3Vout 0.05 0.10 0.15 0.20 0.25 LOAD CURRENT (A) 0.30 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2011–2013, Texas Instruments Incorporated LMR14203 SNVS732C – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com CBOOT L1 VOUT LMR14203 VIN VIN CB SHDN SW GND FB D1 R1 R2 CIN COUT Connection Diagram Top View LMR14203 CB 1 GND 2 FB 3 PIN 1 ID 6 SW 5 VIN 4 SHDN Figure 1. 6 Lead SOT Package See Package Number DDC0006A Pin Descriptions Pin Name Function 1 CB 2 GND SW FET gate bias voltage. Connect CBOOT cap between CB and SW. 3 FB 4 SHDN 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. 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. 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. 2 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Product Folder Links: LMR14203 LMR14203 www.ti.com SNVS732C – OCTOBER 2011 – REVISED APRIL 2013 Absolute Maximum Ratings (1) (2) VIN -0.3V to +45V SHDN -0.3V to (VIN+0.3V)