LM46000 3.5-V to 60-V, 0.5-A Synchronous Step-Down Voltage Converter

1 Features

24-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 Prebiased 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 LM46000 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 V_IN Regulation
High Efficiency Point-Of-Load Regulation

3 Description

The LM46000 regulator is an easy-to-use synchronous step-down DC-DC converter capable of driving up to 500 mA of load current from an input voltage range of 3.5 V to 60 V. The LM46000 provides exceptional efficiency, output accuracy and dropout voltage in a very small solution size. An extended family is available in 1 A and 2 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, V_CC undervoltage lockout, cycle-by-cycle current limit, and output short-circuit protection. The LM46000 device is available in the 16-pin leaded HTSSOP (PWP) package (6.6 mm × 5.1 mm × 1.2 mm) with 0.65-mm lead pitch. Pin-to-pin compatible with LM46001, LM46002, LM43603, LM43602, LM43601, and LM43600.

Device Information⁽¹⁾

PART NUMBER	PACKAGE	BODY SIZE (NOM)
LM46000	HTSSOP (16)	6.60 mm × 5.10 mm

For all available packages, see the orderable addendum at the end of the datasheet.

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