1 Features

1• 33-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 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 LM43600 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 LM43600 regulator is an easy-to-use

synchronous step-down DC-DC converter capable of

driving up to 0.5 A of load current from an input

voltage ranging from 3.5 V to 36 V (42 V transient).

The LM43600 provides exceptional efficiency, output

accuracy and drop-out voltage in a very small

solution size. An extended family is available in 1-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 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 LM43600 device is

available in the 16-pin HTSSOP (PWP) leaded

package (6.6 mm × 5.1 mm × 1.2 mm) with 0.65-mm

lead pitch. Pin-to-pin compatible with LM46000,

LM46001, LM46002, LM43601, LM43602, and

LM43603 devices.