The MAX1765 is a high-efficiency, low-noise, step-up DC-DC converter intended for use in battery-powered wireless applications. This device operates at a high 1MHz fixed frequency while maintaining an exception- ally low quiescent supply current (200µA). Its small external components and tiny package make this device an excellent choice for small hand-held applica- tions that require the longest possible battery life. The MAX1765 uses a synchronous-rectified pulse- width-modulation (PWM) boost topology to generate 2.5V to 5.5V outputs from a wide range of input sources, such as one to three alkaline or NiCd/NiMH cells or a single lithium-ion (Li+) cell. Maxim's propri- etary architecture significantly improves efficiency at low load currents while automatically transitioning to fixed-frequency PWM operation at medium to high load currents to maintain excellent full-load efficiency. Forced-PWM mode is available for applications that require constant-frequency operation at all load cur- rents, and the MAX1765 may also be synchronized to an external clock to protect sensitive frequency bands in communications equipment. The MAX1765’s low-dropout (LDO) linear regulator and DC-DC converter have separate shutdown control. The linear regulator's 250mΩ pass device maintains excel- lent dropout voltage at currents up to 500mA. The MAX1765 also features analog soft-start and current- limit functions to permit optimization of efficiency, exter- nal component size, and noise.
The MAX1765 is a high‑efficiency, low‑noise step‑up DC‑DC converter designed for battery‑powered wireless applications. It operates at a fixed 1 MHz frequency, offers up to 93 % efficiency, and includes a 500 mA linear regulator with low dropout voltage.
Key features include an adjustable output of 2.5 V to 5.5 V, up to 800 mA output current, synchronous‑rectified PWM topology, soft‑start and current‑limit functions, and a 0.1 pA logic‑controlled shutdown. The device is offered in 16‑pin QSOP and TSSOP‑EP packages and operates from –40 °C to +85 °C.
| Input Voltage Range | 0.7 V to 5.5 V |
|---|---|
| Output Voltage Adjust Range | 2.5 V to 5.5 V |
| Maximum Output Current | 800 mA |
| LDO Linear Regulator Current | 500 mA |
| Efficiency | Up to 93 % |
| Switching Frequency | 1 MHz |
| Shutdown Current | 0.1 pA |
| Operating Temperature Range | -40 °C to +85 °C |
The device operates from 0.7 V up to 5.5 V input.
It can supply up to 800 mA of output current.
Yes, it has a logic‑controlled shutdown with a 0.1 pA current.