General Description
The Microchip MIC33M656 is an I2C programmable,
high-efficiency, low-voltage input, 6A current, synchronous
step-down regulator power module with
integrated inductor. The Constant-On-Time (COT) control
architecture with HyperLight Load® mode provides
very high efficiency at light loads, while still having
ultra-fast transient response.
The I2C interface allows programming the output
voltage, between 0.6V and 1.28V with 5 mV resolution,
or between 0.6V and 3.84V with 10 mV and 20 mV
resolution. Three different default voltage options
(0.6V, 0.9V and 1.0V) are provided so that the application
can be started with a safe voltage level and then
moved to high-performance modes under I2C control.
An open-drain Power Good output facilitates output
voltage monitoring and sequencing. If set in shutdown
(EN = GND), the MIC33M656 typically draws 1.5 μA,
while the output is discharged through a 10pull-down
(if the output discharge feature is enabled).
The MIC33M656 pinout is compatible with the
MIC33M650, so that applications can be easily
converted.
The 2.4V to 5.5V input voltage range, low shutdown and
quiescent currents make the MIC33M656 ideal for
single-cell Li-ion battery-powered applications. The 100%
duty cycle capability provides low dropout operation,
extending operating range in portable systems.
The MIC33M656 is available in a thermally efficient,
53-Lead, 6 mm x 10 mm x 3 mm B1QFN package, with
an operating junction temperature range from -40°C to +125°C.

Features
• Input Voltage Range: 2.4V to 5.5V
• 6A Output Current
• Multiple Faults Indication through I2C
• I2C Programmable:
- Output voltage: 0.6V-1.28V, 5 mV resolution;
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-10A
- Enable delay: 0.2 ms-3 ms
- Output discharge when disabled (EN = GND)
• 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
• Meets CISPR32 Class B Emissions
• Power Good (PG) Open-Drain Output
• Package: 53-Lead, 6 mm x 10 mm B1QFN

Applications
• Solid-State Drives (SSD)
• FPGAs, DSP and Low-Voltage ASIC Power