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.