The LM43603 regulator is an easy-to-use synchronous step-down DC-DC converter capable of driving up to 3 A of load current from an input voltage ranging from 3.5 V to 36 V (42 V abs max). The LM43603 provides exceptional efficiency, output accuracy and dropout voltage in a very small solution size. An extended family is available in 0.5-A, 1-A, and 2-A load current options in pin to pin compatible packages. Peak current mode control is employed to achieve simple control loop compensation and cycle-by-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, cycle-by-cycle current limit, and output short circuit protection. The LM43603 device is available in the HTSSOP / PWP 16 leaded package (5.1 mm × 6.6 mm × 1.2 mm) and VSON-16 package with wettable flanks. HTSSOP package is pin-to-pin compatible with LM43600, LM43601, LM43602, LM46000, LM46001, LM46002. VSON-16 package is only pin-to-pin compatible with LM43602.
● 27-µA Quiescent Current in Regulation
● High Efficiency at Light Load (DCM and PFM)
● Meets EN55022/CISPR 22 EMI standards
● Integrated Synchronous Rectification
● Adjustable Frequency Range: 200 kHz to 2.2 MHz (500 kHz default)
● Frequency Synchronization to External Clock
● Internal Compensation
● Stable with Almost Any Combination of Ceramic, Polymer, Tantalum, and Aluminum Capacitors
● Power-Good Flag
● Soft Start into a Pre-Biased Load
● Internal Soft-Start: 4.1 ms
● Extendable Soft-Start Time by External Capacitor
● Output Voltage Tracking Capability
● Precision Enable to a Program System UVLO
● Output Short Circuit Protection with Hiccup Mode
● Overtemperature Thermal Shutdown Protection
● Create a Custom Design Using the LM43603 with the WEBENCH® Power Designer
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