The MIC4576 is a series of easy-to-use fixed and adjustable BiCMOS step-down (buck) switch-mode voltage regulators. The 200 kHz MIC4576 duplicates the pinout and function of the 52 kHz LM2576. The higher switching frequency may allow up to a 2:1 reduction in output filter inductor size. The MIC4576 is available in 3.3V, and 5V fixed output versions or a 1.23V to 33V adjustable output version. Both versions are capable of driving a 3A load with excellent line and load regulation. The feedback voltage is guaranteed to ±2% tolerance for adjustable versions, and the output voltage is guaranteed to ±3% for fixed versions, within specified voltages and load conditions. The oscillator frequency is guaranteed to ±10%. In Shutdown mode, the regulator draws less than 200 µA shutdown current. The regulator performs cycle-by-cycle current limiting and thermal shutdown 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. Frequency compensation is provided internally. The MIC4576 is available in TO-220 (T) and TO-263 (U) packages for the industrial temperature range.
Features:-
- Fixed 200 kHz Operation
- 3.3V, 5V, and Adjustable Output Versions
- Voltage Over Specified Line and Load Conditions: – Fixed version: ±3% maximum output voltage – Adjustable version: ±2% maximum feedback voltage
- Guaranteed 3A Switch Current
- Wide 4V to 36V Input Voltage Range
- Wide 1.23V to 33V Output Voltage Range
- Requires Minimum External Components
- <200 µA Typical Shutdown Mode
- 75% Efficiency (Adjustable Version > 75% Typical)
- Standard Inductors are 25% of Typical LM2576 Inductor Values
- Thermal Shutdown
- Over current Protection
- 100% Electrical Thermal Limit Burn-In
Specification:-
Parameter | Specification |
Supply Voltage (VIN) | 40V |
Shutdown Voltage (VSHDN) | –0.3V to +36V |
Output Switch (VSW), Steady State | –1V |
Feedback Voltage (VFB) [Adjustable] | 3.8V |
Storage Temperature (TS) | –65°C to +150°C |
Junction Temperature (TJ) | 150°C |
* product image for illustration purposes only. actual product may vary.
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