1 Features
1• 27-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 LM46002 with
the WEBENCH® Power Designer

2 Applications
• Industrial power supplies
• Telecommunications systems
• Sub-AM band automotive
• Commercial vehicle power supplies
• General-purpose wide VIN regulation
• High-efficiency point-of-load regulation

3 Description
The LM46002 regulator is an easy-to-use
synchronous step-down DC/DC converter capable of
driving up to 2 A of load current from an input voltage
ranging from 3.5 V to 60 V. The LM46002 provides
exceptional efficiency, output accuracy and drop-out
voltage in a very small solution size. An extended
family is available in various load current options and
36-V maximum input voltage in pin-to-pin compatible
packages, including LM46001, LM46000, LM43603,
LM43602, LM43601 and LM43600. Peak-currentmode
control is employed to achieve simple controlloop
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. 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 LM46002 device is
available in the 16-lead HTSSOP / PWP package
(6.6 mm × 5.1 mm × 1.2 mm) with 0.65-mm lead
pitch.