MAX724/MAX726 are 5A/2A step-down, PWM, switch-mode DC-DC regulators optimized for step-down applications. These regulators employ a classic buck topology and can perform high-current step-down functions, but can also be configured as inverters, negative boost converters, or flyback converters. These regulators have excellent dynamic and transient response characteristics, while featuring cycle-by-cycle current limiting to protect against overcurrent faults and short-circuit output faults. The MAX724/MAX726 also have a wide 8V to 40V input range in the buck step-down configuration. In inverting and boost configurations, the input can be as low as 5V. The MAX724/MAX726 are available in a 5-pin TO-220 package. The devices have a preset 100kHz oscillator frequency and a preset current limit of 6.5A (MAX724) or 2.6A (MAX726).
The MAX724 and MAX726 are monolithic, bipolar PWM switch‑mode DC‑DC regulators optimized for step‑down applications. The MAX724 delivers up to 5 A and the MAX726 up to 2 A, with a wide 8 V to 40 V input range and a preset 100 kHz oscillator frequency. Their internal power switch, oscillator, and control circuitry reduce external component count.
The devices support multiple configurations, including buck, inverter, negative boost, and flyback converters. Typical applications include high‑current step‑down from high‑voltage buses, distributed power, and isolated DC‑DC conversion. Detailed electrical characteristics, pin functions, and design guidelines are provided for designers.
| Input Voltage Range | 8 V to 40 V |
|---|---|
| Maximum Output Current | 5 A (MAX724) / 2 A (MAX726) |
| Switching Frequency | 100 kHz (preset) |
| Quiescent Current | 8.5 mA |
| Package | 5‑pin TO‑220 |
| Operating Temperature Range | -40 °C to +85 °C (MAX726) |
| Current‑Limit Threshold | 6.5 A (MAX724) / 2.64 A (MAX726) |
The regulators operate with an input voltage from 8 V up to 40 V.
Both devices use a preset oscillator frequency of 100 kHz.
The MAX724 can deliver up to 5 A, while the MAX726 is rated for up to 2 A.
Both parts are supplied in a 5‑pin TO‑220 package.