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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

DESCRIPTION

The LM2717 is composed of two PWM DC/DC buck

step-down) 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.