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 industry-standard 8-pin SO but dissipates up to 1W. An evaluation kit (MAX618EVKIT) is available to help speed designs.
The MAX618 is a CMOS PWM step‑up DC‑DC converter that generates output voltages up to 28 V from input voltages between +3 V and +28 V. It features an internal 2 A switch, idle‑mode operation for light loads, and a fast 250 kHz switching frequency, achieving up to 93 % efficiency. The device is supplied in a thermally enhanced 16‑pin QSOP package.
Typical applications include automotive‑powered DC‑DC conversion, industrial +24 V/28 V systems, LCD displays, and palmtop computers. The datasheet provides pin configurations, electrical characteristics, typical operating circuits, and detailed information on idle‑mode and compensation schemes.
| Output Voltage Range | Up to +28 V |
|---|---|
| Input Voltage Range | +3 V to +28 V |
| Maximum Output Current | 500 mA at +12 V |
| Efficiency | Up to 93 % |
| Switching Frequency | 250 kHz |
| Package | 16‑pin QSOP |
| Operating Temperature Range | -40 °C to +85 °C |
The MAX618 can be adjusted to provide up to +28 V output.
The converter operates at a fixed 250 kHz switching frequency.
Idle‑mode operation at light loads helps the device reach up to 93 % efficiency.