LM2717

LM2717 Dual Step-Down DC/DC Converter www.DataSheet4U.com March 4, 2008 LM2717 Dual Step-Down DC/DC Converter General Description The LM2717 is composed of two PWM DC/DC buck (stepdown) converters. The first converter is used to generate a fixed output voltage of 3.3V. The second converter is used to generate an adjustable output voltage. Both converters feature low RDSON (0.16Ω) internal switches for maximum efficiency. Operating frequency can be adjusted anywhere between 300kHz and 600kHz allowing the use of small external components. External soft-start pins for each enables the user to tailor the soft-start times to a specific application. Each converter may also be shut down independently with its own shutdown pin. The LM2717 is available in a low profile 24-lead TSSOP package ensuring a low profile overall solution. Features ■ Fixed 3.3V output buck converter with a 2.2A, 0.16Ω, internal switch ■ Adjustable buck converter with a 3.2A, 0.16Ω, internal ■ ■ ■ ■ ■ switch Operating input voltage range of 4V to 20V Input undervoltage protection 300kHz to 600kHz pin adjustable operating frequency Over temperature protection Small 24-Lead TSSOP package Applications ■ ■ ■ ■ TFT-LCD Displays Handheld Devices Portable Applications Laptop Computers Typical Application Circuit 20078501 © 2008 National Semiconductor Corporation 200785 www.national.com LM2717 Connection Diagram Top View www.DataSheet4U.com 20078504 24-Lead TSSOP Ordering Information Order Number LM271...