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LMR14050SSQDDARQ1 Datasheet(PDF) 9 Page - Texas Instruments |
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LMR14050SSQDDARQ1 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 33 page ERROR AMPLIFIER Boot Charge Boot UVLO Oscillator with PLL Frequency Shift PWM Control Logic Slope Compensation PWM Comparator Voltage Reference FB VIN GND Thermal Shutdown EN Enable Comparator Shutdown Logic Shutdown Enable Threshold 6 Shutdown OV Comp Components Bootstrap Control VIN UVLO BOOT SS RT/SYNC SW LMR14050-Q1 www.ti.com SNVSAG2 – NOVEMBER 2015 7 Detailed Description 7.1 Overview The LMR14050-Q1 SIMPLE SWITCHER® regulator is an easy to use step-down DC-DC converter that operates from a 4.0 V to 40 V supply voltage. It integrates a 90 m Ω (typical) high-side MOSFET, and is capable of delivering up to 5 A DC load current with exceptional efficiency and thermal performance in a very small solution size. The operating current is typically 40 μA under no load condition (not switching). When the device is disabled, the supply current is typically 1 μA. An extended family is available in 2 A and 3.5 A load options in pin to pin compatible packages. The LMR14050-Q1 implements constant frequency peak current mode control with Sleep-mode at light load to achieve high efficiency. The device is internally compensated, which reduces design time, and requires fewer external components. The switching frequency is programmable from 200 kHz to 2.5 MHz by an external resistor RT. The LMR14050-Q1 is also capable of synchronization to an external clock within the 250 kHz to 2.3 MHz frequency range, which allows the device to be optimized to fit small board space at higher frequency, or high efficient power conversion at lower frequency. Other features are included for more comprehensive system requirements, including precision enable, adjustable soft-start time, and approximate 97% duty cycle by BOOT capacitor recharge circuit. These features provide a flexible and easy to use platform for a wide range of applications. Protection features include over temperature shutdown, VOUT over voltage protection (OVP), VIN under-voltage lockout (UVLO), cycle-by-cycle current limit, and short-circuit protection with frequency fold-back. 7.2 Functional Block Diagram Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LMR14050-Q1 |
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