1 Features
1• 24-μA Quiescent Current in Regulation
• High Efficiency at Light Load (DCM and PFM)
• Meets EN55022/CISPR 22 EMI standards
• Integrated Synchronous Rectification
• Adjustable Switching Frequency: 200 kHz to
2.2 MHz (500 kHz default)
• Frequency Synchronization to External Clock
• Internal Compensation
• Stable With Many Combinations 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 LM46001 With
the WEBENCH® Power Designer

2 Applications
• Industrial Power Supplies
• Telecommunications Systems
• Sub-AM Band 12-V and 24-V Automotive
• Commercial Vehicle Power Supplies
• General Purpose Wide VIN Regulation
• High Efficiency Point-Of-Load Regulation

3 Description
The LM46001 regulator is an easy-to-use
synchronous step-down DC-DC converter capable of
driving up to 1 A of load current from an input voltage
ranging from 3.5 V to 60 V. The LM46001 provides
exceptional efficiency, output accuracy, and dropout
voltage in a very small solution size. An extended
family is available in 0.5-A and 2-A load current
options in pin-to-pin compatible packages. Peakcurrent-
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-touse
platform for a wide range of applications.
Discontinuous conduction and automatic frequency
reduction 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 LM46001 device is
available in the 16-lead HTSSOP package (PWP,
6.6 mm × 5.1 mm × 1.2 mm) with 0.65-mm lead pitch.
The device is pin-to-pin compatible with LM46000,
LM46002, LM43603, LM43602, LM43601, and
LM43600.