Microchip Technology MIC22400YTSE-TR

Overview

MIC22400YTSE-TR from Microchip Technology is a 4A synchronous buck regulator IC with adjustable output down to 0.7V, 300 kHz–4 MHz programmable switching frequency, and full sequencing/tracking capability for multi-rail power systems. It integrates high-side (60 mΩ) and low-side (35 mΩ) MOSFETs, supports 2.6V–5.5V input, and delivers >90% efficiency across load range - deployed in FPGA, DSP, and ASIC core voltage regulation.

For engineers reviewing the MIC22400YTSE-TR datasheet, MIC22400YTSE-TR pinout, MIC22400YTSE-TR application, or MIC22400YTSE-TR equivalent, key selection criteria include its 20-pin QFN (3 mm × 4 mm) thermal performance (θJA = 45°C/W), ultra-fast transient response under ±1A/μs load steps, 100% duty cycle operation, and integrated POR/RC/DELAY control for precise power sequencing in high-density computing and telecom infrastructure.

Technical Context

The MIC22400YTSE-TR implements voltage-mode PWM control with an internal 1 MHz ramp generator and adaptive drive circuitry for fast loop response. Its control architecture includes dedicated EN/DLY (1 μA source), RC (1 μA source), and DELAY (1 μA source/sink) pins enabling independent soft-start, slew-rate control, and POR timing coordination across multiple regulators.

It features dual-input power rails (PVIN for power MOSFETs, SVIN for signal circuitry), separate PGND and SGND planes, and integrated thermal shutdown (150°C) with 10°C hysteresis. The device operates across –40°C to +125°C junction temperature and supports ceramic input/output capacitors with X5R/X7R dielectrics only.

Key Specifications

Pinout & Package

Package: 20-pin QFN (3 mm × 4 mm), thermally enhanced with exposed GND pad (EP). Pinout validated per DS20006243A-page 10 Table 3-1 and top-view diagrams.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2315DJ-LF-Z and TPS544B20RTWR, the MIC22400YTSE-TR uniquely combines analog sequencing precision (RC/DELAY), ultra-low quiescent current (<2 mA), and sub-1V output capability in a compact QFN - making it optimal for FPGA/ASIC power where analog control simplicity and thermal density are prioritized over digital configurability or wide-input flexibility.

Availability

MIC22400YTSE-TR is available at Aetrix Electronics and suitable for FPGA core power, telecom base station DC-DC conversion, and high-density server point-of-load applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MIC22400YTSE-TR 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 is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog, and power management ICs with ISO 9001-certified global operations and broad automotive/industrial qualification.

The MIC22400 product line targets high-efficiency, high-density point-of-load regulation for computing, networking, and communications equipment - designed specifically for FPGA, DSP, and ASIC power domains demanding analog sequencing, fast transient response, and thermal resilience.

FAQ

What is the maximum output current supported by the MIC22400YTSE-TR?

The MIC22400YTSE-TR supports up to 4A continuous output current under thermal limits defined by its 3 mm × 4 mm QFN package (θJA = 45°C/W) and ambient conditions. Peak current limit is specified at 4–10A depending on FB voltage, with thermal shutdown activating at 150°C junction temperature to protect the device during overload or poor heatsinking.

Does the MIC22400YTSE-TR support adjustable switching frequency, and how is it configured?

Yes, the MIC22400YTSE-TR supports programmable switching frequency from 300 kHz to 4 MHz. Frequency is set primarily by a capacitor connected to the CF pin (e.g., 390 pF yields ~1.05 MHz); adding a resistor (RCF) in parallel with CF extends the lower range down to 300 kHz. Configuration details and capacitor/resistor values are provided in Table 6-1 and Equation 6-2 of the official datasheet DS20006243A.

How does the RC pin function in the MIC22400YTSE-TR, and what design value does it provide?

The RC pin in the MIC22400YTSE-TR sources a precise 1 μA current to charge an external capacitor to ground, directly controlling the slew rate of the output voltage during startup. This enables precise voltage tracking between multiple MIC22400YTSE-TR devices - for example, coordinating 1.5V I/O and 1.2V core rails with ΔV < 50 mV - without requiring external DACs or digital controllers.

What are the key differences between PVIN and SVIN pins on the MIC22400YTSE-TR?

PVIN supplies power to the internal high-side P-channel MOSFET and must be bypassed with ≥22 μF ceramic capacitance; SVIN powers the analog control circuitry (error amplifier, oscillators, POR) and requires separate low-noise decoupling to SGND. Separating these rails reduces noise coupling from high-current switching into sensitive feedback and timing circuits - a critical layout requirement confirmed in Section 5.1 and 5.8 of DS20006243A.

Can the MIC22400YTSE-TR operate with 100% duty cycle, and under what conditions?

Yes, the MIC22400YTSE-TR supports 100% duty cycle operation when the input voltage approaches the output voltage - for example, regulating 3.3V output from a 3.6V input rail. This feature maintains regulation during input droop conditions without dropout, enabled by the internal control architecture that disables the low-side FET and sustains conduction through the high-side P-MOSFET alone.