1 Features
1• 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 Program System UVLO
• Output Short Circuit Protection with Hiccup Mode
• Overtemperature Thermal Shutdown Protection
• Create a Custom Design Using the LM43602 with
the WEBENCH® Power Designer

2 Applications
• Industrial Power Supplies
• Telecommunications Systems
• Sub-AM Band Automotive
• General Purpose Wide VIN Regulation
• High Efficiency Point-Of-Load Regulation

3 Description
The LM43602 regulator is an easy-to-use
synchronous step-down DC-DC converter capable of
driving up to 2 A of load current from an input voltage
ranging from 3.5 V to 36 V (42-V absolute maximum).
The LM43602 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 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 terminal arrangement allows simple,
optimum PCB layout. Protection features include
thermal shutdown, VCC undervoltage lockout, cycleby-
cycle current limit, and output short circuit
protection. The LM43602 device is available in a 16-
lead HTSSOP package (5.1 mm × 6.6 mm × 1.2 mm)
and 16-pin VSON package with wettable flanks.