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