LM2717-ADJ_08 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – Dual Step-Down DC/DC Converter

March 4, 2008
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 generate
an adjustable output voltage as low as 1.267V. Both also fea-
ture low R_DSON (0.16Ω) internal switches for maximum effi-
ciency. Operating frequency can be adjusted anywhere
between 300kHz and 600kHz allowing the use of small ex-
ternal components. External soft-start pins for each converter
enables the user to tailor the soft-start times to a specific ap-
plication. Each converter may also be shut down indepen-
dently with its own shutdown pin. The LM2717-ADJ is
available in a low profile 24-lead TSSOP package ensuring a
low profile overall solution.
Features
■ ^{Adjustable buck converter with a 2.2A, 0.16Ω, internal}
switch (Buck 1)
■ ^{Adjustable buck converter with a 3.2A, 0.16Ω, internal}
switch (Buck 2)
■ ^{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}
■ ^{Automotive Applications}
Typical Application Circuit
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