General Description

The MIC2133 is a constant on-time, dual phase,

synchronous buck controller featuring a unique adaptive

on-time control architecture with HyperLight Load and

phase shedding features enabled. The MIC2133 operates

over an input supply range from 8V to 75V. The output

voltage is adjustable down to 0.6V with an ensured

accuracy of ±1 at the FBS pin. The device operates

with programmable switching frequency from 100 kHz to

1 MHz per phase.

The Hyper Speed Control architecture supports an ultrafast

transient response under medium to heavy loads.

The soft start is also programmable externally with a

capacitor, thus, enabling safe start-ups into heavy loads.

The MIC2133 has a remote sense amplifier for accurate

output voltage control.

MIC2133 offers a full suite of protection features to

ensure protection of the IC during Fault conditions.

These include undervoltage lockout to ensure proper

operation, programmable soft start to reduce inrush current,

overvoltage discharge, Hiccup mode short-circuit

protection and thermal shutdown.

MIC2133 is available in a 5 mm x 5 mm, 32-pin VQFN

package with a -40°C to +125°C operating junction

temperature range.

Features

• Input Voltage Range: 8V to 75V

• Input Down to 2V when VDD = 5V from External

Supply

• Adjustable Output Voltage from 0.6V to 28V

• Adaptive Constant On-Time Control:

- High Delta V operation

- Any Capacitor™ stable

• 0.6V Internal Reference with ±1 Accuracy

• Ripple Injection from Third Node Allows Greater

than 50 Duty Cycles

• HyperLight Load® and Automatic Phase Shedding

• Ability to Interface with External MCU

• Accurate Current Balancing Between Phases

• Accurate 180° Phasing of Outputs

• 100 kHz to 1 MHz Switching Frequency per Phase

• High-Voltage Internal 5V LDO for Single-Supply

Operation

• Secondary LDO to Improve System Efficiency

• Supports Start-up to Pre-Bias Output

• Remote Sense Amplifier for Tight Output Regulation

• Droop Feature to Support Adaptive Voltage

Positioning (AVP) for Improved Load

Transient Response

• Precision Enable Function for Low Standby Current

• External Programmable Soft Start to Reduce

Inrush Current

• Lossless RDSON Current Sensing with NTC

Temperature Compensation or Resistor Sensing

Method

• Programmable Current Limit and Hiccup Mode

Short-Circuit Protection

• Thermal Shutdown with Hysteresis

• -40°C to +125°C Junction Temperature Range

• Compact Size 5 mm x 5 mm, 32-Pin VQFN

Package

• AEC-Q100 Qualified (VAO Suffix)

Applications

• Distributed Power Systems

• Communications/Networking Infrastructure

• Printers, Scanners, Graphic and Video Cards

• FPGA, CPU, Memory, GPU Core Supplies

• Automotive POL