Microchip Technology MIC28516T-E/PHAVAO

Overview

MIC28516T-E/PHAVAO from Microchip Technology is a synchronous buck DC/DC regulator with adaptive on-time control architecture, delivering up to 8A output current across 4.5V–70V input and adjustable 0.6V–32V output. It features ±1% feedback accuracy, 270–800 kHz programmable switching frequency, and AEC-Q104 qualification for automotive-grade reliability in high-voltage industrial power supplies.

For engineers reviewing the MIC28516T-E/PHAVAO datasheet, MIC28516T-E/PHAVAO pinout, MIC28516T-E/PHAVAO application, or MIC28516T-E/PHAVAO equivalent, key selection criteria include high-VIN/low-VOUT capability (70V→0.6V), Hyper Speed Control® transient response, Any Capacitor™ stability, programmable current limit, and pre-biased start-up support.

Technical Context

The MIC28516T-E/PHAVAO implements adaptive on-time control combining fixed-frequency predictability with fast load-step response-enabling stable operation with minimal output capacitance. Its dual-input voltage rails (PVIN for power stage, SVIN for bias) decouple high-side switching losses from control logic supply integrity.

Internal integration includes bootstrap diode, auxiliary EXTVDD LDO for efficiency optimization, and independent ILIM sensing via external resistor-to-SW connection. Protection features are hardware-based: hiccup-mode short-circuit response, thermal shutdown at +150°C with +15°C hysteresis, and UVLO with 600 mV hysteresis.

Key Specifications

Pinout & Package

Package: 32-lead, 6 mm × 6 mm VQFN with exposed thermal pad (pin 1 marked by dot). Thermal resistance θ_JA = 33.3°C/W enables high-power operation with standard PCB copper pour.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Compared with LM5116PWPR and MP24894GQKT-Z, the MIC28516T-E/PHAVAO uniquely combines AEC-Q104 qualification, 70V input, 8A output, pre-biased start-up, and integrated bootstrap diode-making it the only option qualified for automotive-grade high-VIN point-of-load designs.

Availability

MIC28516T-E/PHAVAO is available at Aetrix Electronics and suitable for distributed power systems, communications infrastructure, and industrial power supplies requiring stable component supply, long-lifecycle assurance, and AEC-Q104-compliant performance.

Supply support for MIC28516T-E/PHAVAO includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a leading provider of microcontroller, analog, FPGA, and power management semiconductors, headquartered in Chandler, Arizona.

The MIC28516 product line delivers high-voltage synchronous buck regulators optimized for automotive, industrial, and solar applications demanding wide input range, high efficiency, and robust fault protection.

FAQ

What is the maximum input voltage supported by the MIC28516T-E/PHAVAO?

The MIC28516T-E/PHAVAO supports an absolute maximum input voltage of +71V on PVIN/SVIN pins, with continuous operation rated from 4.5V to 70V. This allows direct connection to 48V telecom, 60V industrial, and 70V solar string inputs without external clamping or pre-regulation. The device's internal MOSFETs and gate drivers are designed for reliable operation across this full range, validated per AEC-Q104 stress testing protocols.

Does the MIC28516T-E/PHAVAO support start-up into a pre-biased output?

Yes, the MIC28516T-E/PHAVAO explicitly supports safe start-up into a pre-biased output, as confirmed in the datasheet General Description and Figure 2-41. This feature prevents reverse current flow and potential damage during hot-swap or redundant power system transitions. The internal control logic monitors the FB pin before enabling switching, ensuring the high-side MOSFET remains off until the output voltage falls below the programmed threshold.

How is the current limit configured on the MIC28516T-E/PHAVAO?

The current limit on the MIC28516T-E/PHAVAO is configured using an external resistor connected between the ILIM pin (Pin 1) and the SW node. As specified in Table 1-1 and Section 4.3, a 3.09 kΩ resistor sets the nominal current limit to 6.25A, with production-tested range 5.75A–6.75A. This method avoids power loss from traditional sense resistors and enables precise, temperature-stable overcurrent protection without additional components.

What package type and thermal characteristics does the MIC28516T-E/PHAVAO use?

The MIC28516T-E/PHAVAO uses a 32-lead, 6 mm × 6 mm VQFN package with exposed thermal pad. Its junction-to-ambient thermal resistance (θ_JA) is 33.3°C/W under standard JEDEC 2S2P test conditions. The package supports AEC-Q104 qualification and includes dedicated parallel PVIN and PGND pins to minimize conduction losses and improve thermal dissipation at 8A continuous load.

Is the MIC28516T-E/PHAVAO compatible with ceramic, polymer, and electrolytic output capacitors?

Yes, the MIC28516T-E/PHAVAO is certified for Any Capacitor™ stability, meaning it operates stably with zero-ESR ceramic, medium-ESR polymer, and high-ESR aluminum electrolytic capacitors-no external compensation required. This is enabled by its internal compensation network and adaptive on-time control architecture, which maintains phase margin across the full ESR range, simplifying capacitor selection and reducing BOM variability.