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.