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.