LM27342SD/NOPB

The LM2734x and LM2734x-Q1 regulators are monolithic, high-frequency, PWM step-down DC-DC converters in 10-pin WSON and 10-pin MSOPPowerPAD packages. They contain all the active functions to provide local DC-DC conversion with fast transient response and accurate regulation in the smallest possible PCB area. With a minimum of external components, the LM2734x and LM2734x-Q1 are easy to use. The ability to drive 1.5-A or 2-A loads respectively, with an internal 150-mΩ NMOS switch results in the best power density available. The control circuitry allows for on-times as low as 65 ns, thus supporting exceptionally high frequency conversion. Switching frequency is internally set to 2 MHz and synchronizable from 1 to 2.35 MHz, which allows the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequency is very high, efficiencies up to 90% are easy to achieve. External shutdown is included, which features an ultra-low shutdown current of 70 nA. The LM2734x and LM2734x-Q1 use peak current-mode control and internal compensation to provide highperformance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, and output overvoltage protection.

Applications

• Local 12-V to Vcore Step-Down Converters
• Radio Power Supply
• Core Power in HDDs
• Set-Top Boxes
• Automotive
• USB Powered Devices
• DSL Modems

Key features

• Space-Saving, 3 mm×3 mm 10-Pin WSON and MSOP-PowerPAD Packages
• Wide Input Voltage Range: 3 V to 20 V
• Wide Output Voltage Range: 1 V to 18 V
• LM27341 Delivers 1.5-A Maximum Output Current
• LM27342 Delivers 2-A Maximum Output Current
• High Switching Frequency: 2 MHz
• Frequency Synchronization: 1 MHz < fSW < 2.35 MHz
• 150-mΩ NMOS Switch With Internal Bootstrap Supply
• 70-nA Shutdown Current
• Internal Voltage Reference Accuracy of 1%
• Peak Current-Mode, PWM Operation
• Thermal Shutdown
• LM27341-Q1 and LM27342-Q1 are AEC-Q100 Grade 1 Qualified and Manufactured on an Automotive Grade Flow