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.