The LM27341 and LM27342 regulators are monolithic, high frequency, PWM step-down DC-DC converters in 10-pin SON and 10-pin MSOP-PowerPad 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 LM27341 and LM27342 are easy to use. The ability to drive 1.5A or 2A loads respectively, with an internal 150 m? NMOS switch results in the best power density available. The world-class 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 featuring an ultra-low shutdown current of 70 nA. The LM27341 and LM27342 utilize peak current-mode control and internal compensation to provide high-performance 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 over-voltage protection.

• Space Saving 3 x 3 mm 10-Pin SON and MSOP-PowerPad Packages
• Wide Input Voltage Range: 3V to 20V
• Wide Output Voltage Range: 1V to 18V
• LM27341 Delivers 1.5A Maximum Output Current
• LM27342 Delivers 2A Maximum Output Current
• High Switching Frequency: 2 MHz
• Frequency Synchronization: 1.00 MHz < fSW < 2.35 MHz
• 150 m? 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 are Manufactured on an Automotive Grade Flow