MIC4576 is a simple 3A buck regulator from Micrel, Inc. It is easy to use and provides fixed and adjustable output. Fixed output versions are available in 3.3V and 5V, while the adjustable output version can output in the range of 1.23V to 33V. Both versions can drive a 3A load with excellent line and load regulation. The feedback voltage is guaranteed to be within ±2% for adjustable versions and ±3% for fixed versions. In shutdown mode, the regulator draws less than 200µA standby current. The regulator also has current limiting and thermal shutdown features for protection under fault conditions. This series of simple switch-mode regulators requires a minimum number of external components and can operate using a standard series of inductors. It is available in TO-220 (T) and TO-263 (U) packages for the industrial temperature range.
The MIC4576 is a 200 kHz step‑down (buck) switch‑mode regulator available in fixed 3.3 V, 5 V and adjustable 1.23 V‑33 V versions. It delivers up to 3 A with high efficiency and includes internal frequency compensation, thermal shutdown, and cycle‑by‑cycle current limiting.
The device is offered in TO‑220 (T) and TO‑263 (U) packages, with a wide 4 V‑36 V input range and a typical standby current of less than 200 pA. Detailed pin descriptions, absolute maximum ratings, and electrical characteristics are provided, along with typical application circuits and block diagrams.
| Oscillator Frequency | 200 kHz (typical) |
|---|---|
| Input Voltage Range | 4 V to 36 V |
| Output Voltage Range | 1.23 V to 33 V |
| Maximum Switch Current | 3 A |
| Efficiency | up to 77 % |
| Standby Current | <200 pA |
The regulator operates with an input voltage from 4 V up to 36 V.
It can deliver up to 3 A of load current.
In shutdown mode the regulator draws less than 200 pA.
The device is offered in TO‑220 (T) and TO‑263 (U) packages.