LMR14203

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 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 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. 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...