LM43601PWP

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1. Description

The LM43601PWP regulator is an easy to use synchronous step-down DC-DC converter capable of driving up to 1 A of load current from an input voltage ranging from 3.5 V to 36 V (42 V transient). The LM43601PWP provides exceptional efficiency, output accuracy, and dropout voltage in a very small solution size. An extended family is available in 0.5-A, 2-A and 3-A load current options in pin-to-pin compatible packages. Peak-current-mode control is employed to achieve simple control-loop compensation and cycleby-cycle current limiting. Optional features such as programmable switching frequency, synchronization, power-good flag, precision enable, internal soft start, extendable soft start, and tracking provide a flexible and easy-to-use platform for a wide range of applications. Discontinuous conduction and automatic frequency modulation at light loads improve light load efficiency. The family requires few external components and pin arrangement allows simple, optimum PCB layout. Protection features include thermal shutdown, VCC undervoltage lockout, cycleby-cycle current limit, and output short-circuit protection. The LM43601 device is available in the 16-leaded HTSSOP (PWP) package (6.6 mm × 5.1 mm × 1.2 mm) with 0.65-mm lead pitch. This device is pin-to-pin compatible with LM46000, LM46001, LM46002, LM43600, LM43602, and LM43603.

2. Features

    1. 33-µA Quiescent Current in Regulation

    2. High Efficiency at Light Load (DCM and PFM)

    3. Meets EN55022/CISPR 22 EMI Standards

    4. Integrated Synchronous Rectification

    5. Adjustable Frequency Range: 200 kHz to 2.2 MHz (500 kHz default)

    6. Frequency Synchronization to External Clock

    7. Internal Compensation

    8. Stable With Almost Any Combination of Ceramic, Polymer, Tantalum, and Aluminum Capacitors

    9. Power-Good Flag

  10. Soft Start into Pre-Biased Load

  11. Internal Soft Start: 4.1 ms

  12. Extendable Soft-Start Time by External Capacitor

  13. Output Voltage Tracking Capability

  14. Precision Enable to Program System UVLO

  15. Output Short-Circuit Protection With Hiccup Mode

  16. Overtemperature Thermal Shutdown Protection

  17. Create a Custom Design Using the LM43601 With the WEBENCH® Power Designer

3. Applications

    1. Industrial Power Supplies

    2. Telecommunications Systems

    3. Sub-AM Band Automotive

    4. General Purpose Wide VIN Regulation

    5. High Efficiency Point-Of-Load Regulation

4. Pin Configuration

5. Pin Functions

6. Application Information

The LM43601 is a step down DC-to-DC regulator. It is typically used to convert a higher DC voltage to a lower DC voltage with a maximum output current of 1 A. The following design procedure can be used to select components for the LM43601. Alternately, the WEBENCH® software may be used to generate complete designs. When generating a design, the WEBENCH® software utilizes iterative design procedure and accesses comprehensive databases of components.