LM2717-ADJ Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – Dual Step-Down DC/DC Converter

March 2006
LM2717-ADJ
Dual Step-Down DC/DC Converter
General Description
The LM2717-ADJ is composed of two PWM DC/DC buck
(step-down) converters. Both converters are used to gener-
ate an adjustable output voltage as low as 1.267V. Both also
feature low R_DSON (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 con-
verter 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-ADJ
is available in a low profile 24-lead TSSOP package ensur-
ing a low profile overall solution.
Features
n Adjustable buck converter with a 2.2A, 0.16Ω, internal
switch (Buck 1)
n Adjustable buck converter with a 3.2A, 0.16Ω, internal
switch (Buck 2)
n Operating input voltage range of 4V to 20V
n Input undervoltage protection
n 300kHz to 600kHz pin adjustable operating frequency
n Over temperature protection
n Small 24-Lead TSSOP package
Applications
n TFT-LCD Displays
n Handheld Devices
n Portable Applications
n Laptop Computers
n Automotive Applications
Typical Application Circuit
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