Microchip Technology MIC22600YTSE

Overview

MIC22600 from Microchip Technology is a 6A, 1 MHz synchronous buck regulator with integrated high-side P-channel and low-side N-channel MOSFETs, operating from 2.6V–5.5V input to adjustable output down to 0.7V. It delivers >90% efficiency across load range, features ultra-fast transient response, and supports full sequencing and tracking in multi-rail FPGA/DSP power systems.

For engineers reviewing the MIC22600 datasheet, MIC22600 pinout, MIC22600 application, or MIC22600 equivalent, key selection criteria include its 24-pin QFN/TSSOP package, 100% duty cycle capability, Power Good/POR and RC-controlled ramping, thermal shutdown, and compatibility with low-ESR ceramic output capacitors (22–100 µF) and 0.47–4.7 µH inductors.

Technical Context

The MIC22600 employs voltage-mode PWM control with a fixed 1 MHz oscillator and internal compensation architecture featuring a built-in pole-zero pair. Its adaptive drive circuitry enables fast transient recovery under ±6A load steps, while the RC and DELAY pins provide programmable soft-start and POR timing via external capacitors.

It integrates dual MOSFETs with typical R_DS(ON) of 30 mΩ (P-FET) and 25 mΩ (N-FET), operates over –40°C to +125°C junction temperature, and uses separate PVIN/PGND and SVIN/SGND paths to isolate power and signal grounds-critical for noise-sensitive digital loads like FPGAs and ASICs.

Key Specifications

Pinout & Package

Available in two thermally enhanced packages: 24-pin 4 mm × 4 mm QFN (ML) and 24-pin ePad TSSOP (TSE). Both feature exposed thermal pads (EP) requiring solid GND plane connection for optimal power dissipation and junction temperature control.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ8633BGLE-10-Z and TPS546B24RVFT, the MIC22600 offers unique analog sequencing integration (RC/DELAY/EN-DLY) in a compact 4×4mm QFN, making it optimal for space-constrained, multi-rail FPGA/DSP systems where deterministic analog timing is preferred over digital control.

Availability

MIC22600 is available at Aetrix Electronics and suitable for high-power-density point-of-load conversion, FPGA/DSP core supply, and industrial embedded computing requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.

Supply support for MIC22600 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 global semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with a focus on reliability, longevity, and industrial-grade qualification.

The MIC22600 belongs to Microchip's MIC22xxx family of high-efficiency synchronous buck regulators, designed specifically for demanding point-of-load applications in computing, communications, and industrial systems requiring precision sequencing and robust thermal performance.

FAQ

What is the minimum output capacitor value recommended for stable operation of the MIC22600?

The MIC22600 requires a minimum 22 µF ceramic output capacitor (X5R or X7R dielectric) for stable voltage-mode control. Using Y5V or Z5U capacitors is not recommended due to high capacitance variation with temperature and frequency, which can cause loop instability. For improved transient response, 47–100 µF is commonly used - as validated in the typical application circuit on page 2 of DS20006288A. The MIC22600's internal compensation is optimized for this range.

Does the MIC22600 support 100% duty cycle operation, and under what conditions?

Yes, the MIC22600 supports 100% duty cycle operation when the feedback voltage falls to ≤0.5×V_NOM, enabling regulation even during input voltage dropout (e.g., VIN ≈ VOUT). This behavior is explicitly specified in the Electrical Characteristics table (page 3) under "Maximum Duty Cycle" and is essential for maintaining core voltage during brown-in conditions in FPGA and DSP applications. It does not require external circuitry or mode switching.

How is power sequencing implemented between multiple MIC22600 devices?

Sequencing is implemented using the RC and DELAY pins: one MIC22600 acts as master with RC tied to VOUT of the slave, while DELAY capacitors set staggered POR assertion times. As shown in Figure 2-27, this creates controlled turn-on order (e.g., core before I/O) and coordinated turn-off (e.g., I/O before core). No external controllers or logic are needed - the MIC22600's internal 1 µA current sources and comparators handle timing deterministically.

What is the purpose of separating PVIN and SVIN pins on the MIC22600?

PVIN supplies the high-side P-channel MOSFET power stage and must be bypassed locally; SVIN powers the analog control circuitry (error amplifier, oscillator, POR comparator) and requires separate low-noise decoupling. This separation minimizes switching noise coupling into sensitive feedback and timing circuits - a key design requirement for maintaining regulation accuracy and transient response in noise-critical applications like FPGA core supplies. The datasheet mandates independent 10 µF ceramics on each.

Can the MIC22600 be used with an output voltage lower than 0.7V?

No - the MIC22600's internal feedback reference is fixed at 0.7V ±1%, and the datasheet specifies "output voltage adjustable down to 0.7V" as the minimum achievable value. Attempting to set lower outputs (e.g., via external reference injection or divider manipulation) violates the device's operational specification and is not supported. For sub-0.7V applications, alternative regulators with lower reference voltages (e.g., 0.6V) must be selected.