The MAX8597/MAX8598/MAX8599 are three low-dropout, high-efficiency PWM step-down controllers that operate from a 4.5V to 28V input supply and generate output voltages down to 0.6V. The MAX8597/MAX8598/MAX8599 feature n-channel MOSFETs, which result in high efficiency and high-current-capability designs. The MAX8597/MAX8598/MAX8599 are available in 20-pin and 16-pin thin QFN packages, respectively, and are suitable for a wide range of applications.
The MAX8597, MAX8598, and MAX8599 are voltage‑mode PWM step‑down controllers designed for input voltages from 4.5 V to 28 V and capable of generating output voltages as low as 0.6 V. The MAX8597 includes an uncommitted operational amplifier for analog‑controlled output, while the MAX8598/MAX8599 provide open‑drain Power‑OK outputs and, for the MAX8599, output over‑voltage protection.
These devices support adjustable switching frequencies (200 kHz – 1.4 MHz), lossless high‑side peak‑inductor current sensing, adjustable current‑limit, and hiccup‑mode short‑circuit protection. The datasheet also details recommended PCB layout practices, pin functions, and evaluation‑kit information.
| Input Voltage Range | 4.5 V – 28 V |
|---|---|
| Output Voltage Range | down to 0.6 V |
| Maximum Duty Cycle | >99.5 % |
| Switching Frequency Range | 200 kHz – 1.4 MHz |
| Package Types | 20‑pin thin QFN (MAX8597) or 16‑pin thin QFN (MAX8598/MAX8599) |
| Operating Temperature Range | -40 °C – +85 °C |
| Soft‑Start Source Current | 3 µA – 7 µA |
They operate from 4.5 V to 28 V input supply.
They can generate output voltages as low as 0.6 V.
By an external resistor, allowing a range of 200 kHz to 1.4 MHz.
The MAX8599 features output over‑voltage protection.