The MIC23656 is a high-efficiency, low-voltage input, 3Apeak current synchronous step-down regulator. The Constant-ON-Time (COT)control architecture with HyperLight Load™ provides very high efficiency atlight loads, while still having ultra-fast transient response.The I2C interface allows programming the output voltagebetween 0.6V and 1.28V, with 5 mV resolution or between 0.6V and 3.84V, with 10mV and 20 mV resolution. Three different default voltage options (0.6V, 0.9Vand 1.0V) are provided so that the application can be started with a safevoltage level and then moved to high performance modes under I2Ccontrol. An open-drain Power Good output facilitates outputvoltage monitoring and sequencing. If set in shutdown (EN = GND), the MIC23656typically draws 1.5 µA, while the output is discharged through 10W pull-down (if the outputdischarge feature is enabled). The MIC23356-FAYFT-TR pinout is compatible with the MIC23350, sothat applications can be easily converted.The 2.4V to 5.5V input voltage range, low shutdown andquiescent currents make the MIC23356-FAYFT-TR ideal for single-cell Li-Ionbattery-powered applications. The 100% duty cycle capability provides lowdropout operation, extending operating range in portable systems. The MIC23356-FAYFT-TR is available in a thermally efficient,16-Lead 2.5 mm x 2.5 mm x 0.55 mm thin FTQFN package, with an operatingjunction temperature range from -40°C to +125°C
Feature
- Input Voltage Range: 2.4V to 5.5V
- 3A Continuous Output Current
- Multiple Faults Indication through I2C
- High Efficiency (up to 95%)
- Ultra-Fast Transient Response
- ±1.5% Output Voltage Accuracy Over Line/Load/Temperature Range
- Safe Start-Up with Pre-Biased Output
- Typical 1.5 µA Shutdown Supply Current
- Low Dropout (100% Duty Cycle) Operation
- I2C Speed up to 3.4 MHz
- Latch-Off Thermal Shutdown Protection
- Latch-Off Current Limit Protection
- Power-Good (PG) Open-Drain Output
- I2C Programmable:
- Output Voltage: 0.6V - 1.28V, 5 mV Resolution or 0.6V - 3.84V, 10/20 mV Resolution
- Slew Rate: 0.2 ms/V - 3.2 ms/V
- ON time (Switching Frequency)
- High Side Current Limit: 3.5A - 5A
- Enable Delay: 0.2 ms - 3 ms
- Output Discharge when Disabled (EN = GND)
