General Description
The MAX618 CMOS, PWM, step-up DC-DC converter
generates output voltages up to 28V and accepts inputs
from +3V to +28V. An internal 2A, 0.3Ω switch eliminates
the need for external power MOSFETs while supplying
output currents up to 500mA or more. A PWM control
scheme combined with Idle Mode™ operation at light
loads minimizes noise and ripple while maximizing efficiency
over a wide load range. No-load operating current
is 500μA, which allows efficiency up to 93%.
A fast 250kHz switching frequency allows the use of
small surface-mount inductors and capacitors. A shutdown
mode extends battery life when the device is not in
use. Adaptive slope compensation allows the MAX618 to
accommodate a wide range of input and output voltages
with a simple, single compensation capacitor.
The MAX618 is available in a thermally enhanced 16-pin
QSOP package that is the same size as an industrystandard
8-pin SO but dissipates up to 1W. An evaluation
kit (MAX618EVKIT) is available to help speed designs.

Applications
●● Industrial +24V and +28V Systems
●● LCD Displays
●● Palmtop Computers

Features
●● Adjustable Output Voltage Up to +28V
●● Up to 93% Efficiency
●● Wide Input Voltage Range (+3V to +28V)
●● Up to 500mA Output Current at +12V
●● 500μA Quiescent Supply Current
●● 3μA Shutdown Current
●● 250kHz Switching Frequency
●● Small 1W, 16-Pin QSOP Package