LM2717 Datasheet | National Semiconductor

Description The LM2717 is posed 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 300k Hz and 600k Hz allowing the use of small external ponents. 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 300k Hz to 600k Hz pin adjustable operating frequency Over temperature protection Small 24-Lead TSSOP package Applications - - - - TFT-LCD Displays Handheld Devices Portable Applications Laptop puters Typical Application Circuit © 2008 National Semiconductor Corporation .national. Connection Diagram Top View .. 24-Lead TSSOP Ordering Information Order Number LM2717MT LM2717MTX LM2717MT LM2717MTX NOPB NOPB Spec Package Type TSSOP-24 TSSOP-24 TSSOP-24 TSSOP-24 NSC Package Drawing MTC24 MTC24 MTC24 MTC24 Supplied As 61 Units, Rail 2500 Units, Tape and Reel 61 Units, Rail 2500 Units, Tape and Reel .national. Pin Descriptions Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Name PGND PGND AGND FB1 VC1 VBG VC2 FB2 AGND AGND PGND PGND SW2 VIN VIN CB2 SHDN2 SS2 FSLCT SS1 SHDN1 CB1 VIN SW1 Function .. Power ground. PGND and AGND pins must be connected together directly at the part. Power ground. PGND and AGND pins must be connected together directly at the part. Analog ground....