28V, PWM, STEP-UP DC-DC CONVERTER

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, 0.3O 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 industry-standard 8-pin SO but dissipates up to 1W. An evaluation kit (MAX618EVKIT) is available to help speed designs.

• 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