LM46000QPWPTQ1

The LM46000-Q1 regulator is an easy-to-use synchronous step-down DC/DC converter capable of driving load currents up to 500mA with an input voltage range of 3.5V to 60V. The LM46000-Q1 delivers excellent efficiency, output accuracy, and dropout voltage in an ultra-compact solution size. The extended family offers 1A and 2A load current options in pin-to-pin compatible packages. Peak current mode control enables simple control loop compensation and cycle-by-cycle current limiting. Optional features include programmable switching frequency, synchronization, power-good flag, precision enable, internal soft-start, scalable soft-start, and tracking, providing a flexible and easy-to-use platform for a wide range of applications. Discontinuous conduction mode and automatic frequency modulation at light loads improve light-load efficiency. The family requires minimal external components, and the pinout enables simple, optimized PCB layout. Protection features include thermal shutdown, VCC UVLO, cycle-by-cycle current limiting, and output short-circuit protection. The LM46000-Q1 is available in a 16-pin HTSSOP (PWP) package (6.6mm × 5.1mm × 1.2mm) with 0.65mm lead pitch. This device is pin-to-pin compatible with the LM4360x and LM4600x families. The LM46000A-Q1 variant is optimized for PFM operation mode and is recommended for new designs.

Applications

• Automotive applications below AM band at 12V and 24V
• Telecom systems
• Commercial vehicle power supplies
• General-purpose wide VIN regulation
• High-efficiency point-of-load regulation

Key features

• Qualified for automotive applications with the following AEC-Q100 characteristics: Device Temperature Grade 1: –40°C to +125°C operating junction temperature range
• 24μA quiescent current in regulation
• High efficiency at light loads (DCM and PFM)
• Tested to meet EN55022/CISPR 22 EMI standards
• Integrated synchronous rectification
• Adjustable frequency range: 200kHz to 2.2MHz (default 500kHz)
• Synchronization to external clock frequency
• Internal compensation stable with almost any combination of ceramic, solid electrolytic, tantalum, and aluminum capacitors
• Power-good flag
• Soft-start into pre-biased loads
• Internal soft-start: 4.1ms
• Soft-start time extendable via external capacitor
• Output voltage tracking
• Precision enable for system UVLO
• Output short-circuit protection with hiccup mode
• Overtemperature protection