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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Microchip Technology MIC26603-ZAYJL-TR

Name: MIC26603-ZAYJL-TR
Brand: Microchip Technology
SKU: MIC26603-ZAYJL-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MIC26603-ZAYJL-TR

Manufacturer:: Microchip Technology

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 28-PowerVQFN

Datasheet:: MIC26603-ZAYJL-TR.pdf

Description:: IC REG BUCK ADJ 6A 28QFN

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Product details

Overview

MIC26603-ZAYJL-TR from Micrel is a synchronous DC-DC buck regulator with Hyper Speed Control™ architecture, operating from 4.5V to 28V input and delivering up to 6A output current at adjustable 0.6V–5.5V with ±1% feedback accuracy and 600kHz switching frequency. It integrates high- and low-side MOSFETs (R_DS(ON) = 42mΩ / 12.5mΩ), internal 5V LDO for gate drive, and open-drain Power Good output - used in communications infrastructure power rails requiring fast transient response and high VIN/low VOUT operation.

For engineers reviewing the MIC26603-ZAYJL-TR datasheet, MIC26603-ZAYJL-TR pinout, MIC26603-ZAYJL-TR application, or MIC26603-ZAYJL-TR equivalent, key selection criteria include its adaptive ON-time control, no-external-compensation design, Any Capacitor® stability, hiccup-mode short-circuit protection, and thermal shutdown with 160°C trip point.

Technical Context

The MIC26603-ZAYJL-TR implements an adaptive ON-time control architecture that estimates t_ON based on V_IN/V_OUT ratio to maintain ~600kHz nominal switching frequency while enabling ultra-fast load transient response. Its control loop senses output voltage ripple via the FB pin to trigger switching events without slope compensation.

It integrates dual N-channel MOSFETs with verified R_DS(ON) values (42mΩ high-side, 12.5mΩ low-side), uses internal current sensing via low-side FET conduction during OFF-time, and supports pre-biased startup. The 28-pin 5mm × 6mm QFN package includes dedicated PVIN, PGND, and SGND pins with strict layout separation requirements for power and signal grounds.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 28V - supports wide-range industrial and telecom inputs including 12V, 24V, and 5V rails with safe operation down to 4.5V.
Output Current	Up to 6A continuous - sufficient for FPGA core, ASIC I/O, or SoC power domains without external current sharing.
Output Voltage Range	Adjustable 0.6V to 5.5V - enables direct regulation of sub-1V processor cores and 1.2V–3.3V peripheral rails.
Feedback Accuracy	±1% over −40°C to +85°C - ensures tight output regulation critical for low-voltage digital loads.
Switching Frequency	600kHz nominal - balances EMI performance, inductor size, and efficiency across common input-output combinations.
Internal MOSFETs	R_DS(ON) = 42mΩ (HS), 12.5mΩ (LS) - eliminates need for external power switches and reduces BOM count and footprint.
Thermal Shutdown	160°C junction trip with 15°C hysteresis - protects against sustained overload or poor heatsinking in enclosed systems.

Pinout & Package

Package: 28-pin 5mm × 6mm QFN (JL), exposed thermal pad, Pb-free, rated for −40°C to +125°C junction temperature.

Pin/Terminal	Circuit Role	Design Meaning
PVDD (Pin 1)	Internal 5V LDO output for gate drive	Supplies high-side driver; requires 2.2µF ceramic cap to PGND; tie to PVIN if VIN < 5.5V.
PGND (Pins 2,5–8,21)	Power ground return path	Carries high di/dt currents from MOSFET sources and input/output capacitors; must be low-inductance, separate from SGND.
SW (Pins 4,9–12)	Switch node connection	Connects high-side drain and low-side source; high dv/dt node requiring short, isolated routing away from sensitive signals.
PVIN (Pins 13–19)	Main power input (4.5–28V)	Dedicated high-current input pins; require local bulk and ceramic input caps tied directly to PGND.
BST (Pin 20)	Bootstrap supply for high-side driver	Requires 0.1µF capacitor to SW and Schottky diode from PVDD; optional series resistor controls HS turn-on speed.
CS (Pin 22)	Current sense input	Monitors low-side MOSFET V_DS during OFF-time for foldback current limit and hiccup-mode protection.
SGND (Pin 23)	Signal ground reference	Reference for FB, EN, PG, and internal circuitry; must connect directly to PCB ground plane, not PGND trace.
FB (Pin 24)	Feedback input	Regulated to 0.6V; sets output via resistor divider; bias current ≤50nA enables high-impedance dividers.
PG (Pin 25)	Open-drain Power Good	Asserts high when V_OUT > 92% of nominal; requires external pull-up to VDD (≥10kΩ).
EN (Pin 26)	Enable control input	CMOS-compatible; logic high ≥1.8V enables regulation; shutdown current ≤10µA.
VIN (Pin 27)	Analog supply input	Provides bias for internal circuitry; requires 1µF ceramic bypass to SGND.
VDD (Pin 28)	Internal 5V LDO output	Supplies IC core and gate drivers; tie to PVIN if VIN < 5.5V; requires 1µF ceramic cap to SGND.

Key Features

Feature	Design Value
Hyper Speed Control™ architecture	Enables stable operation at extreme VIN/VOUT ratios (e.g., 28V→0.6V) with minimal output capacitance and no external compensation.
Any Capacitor® stability	Stable with zero-to-high ESR output capacitors - eliminates need for specific low-ESR tantalum or polymer types.
Integrated power MOSFETs	42mΩ high-side and 12.5mΩ low-side N-channel FETs reduce solution size, cost, and layout complexity.
Foldback current limit & hiccup mode	Current threshold varies with FB voltage (7.5–17A range); short-circuit triggers automatic restart after thermal recovery.
Pre-biased output startup support	Allows safe enable into existing output voltage - essential for hot-swap and rail-sequencing applications.

Applications

Distributed Power Systems	Communications Infrastructure
Use Scenario: Point-of-load regulation in modular server PSUs supplying multiple voltage rails to CPUs, memory, and PCIe slots. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing 12V or 24V intermediate bus conversion to 0.8V–3.3V loads. Use Value: Adaptive ON-time control delivers <10µs transient recovery with only 220µF total output capacitance, reducing board area by 35% vs. fixed-frequency alternatives.	Use Scenario: Powering line cards, baseband units, and optical modules in 5G macro and small-cell base stations. IC Role / Device Role / Timing Role: High-efficiency (up to 95%) buck regulator converting 48V or 24V backplane to 1.2V/1.8V/3.3V for RFICs and FPGAs. Use Value: 600kHz switching enables compact magnetics; thermal shutdown and hiccup mode ensure reliability under intermittent overload conditions typical in wireless infrastructure.
Set-Top Boxes & Gateways	Printers & Graphic Cards
Use Scenario: Multi-rail power management in residential broadband gateways supporting DOCSIS 3.1 and Wi-Fi 6. IC Role / Device Role / Timing Role: Secondary buck regulator generating 1.0V CPU core, 1.2V DDR, and 3.3V interface rails from 12V input. Use Value: ±1% feedback accuracy maintains SoC stability across temperature; soft-start prevents inrush-induced brownouts during cold boot.	Use Scenario: Power delivery to GPU VRMs and print engine controllers in multifunction printers and gaming graphics cards. IC Role / Device Role / Timing Role: High-current (6A) buck stage supplying 1.2V–1.8V to GPU memory or ASIC logic blocks. Use Value: Integrated 42mΩ/12.5mΩ MOSFETs achieve >90% efficiency at 5A load, minimizing thermal stress in space-constrained enclosures.

Distributed Power Systems

Communications Infrastructure

Use Scenario: Point-of-load regulation in modular server PSUs supplying multiple voltage rails to CPUs, memory, and PCIe slots.

IC Role / Device Role / Timing Role: Primary synchronous buck controller managing 12V or 24V intermediate bus conversion to 0.8V–3.3V loads.

Use Value: Adaptive ON-time control delivers <10µs transient recovery with only 220µF total output capacitance, reducing board area by 35% vs. fixed-frequency alternatives.

Use Scenario: Powering line cards, baseband units, and optical modules in 5G macro and small-cell base stations.

IC Role / Device Role / Timing Role: High-efficiency (up to 95%) buck regulator converting 48V or 24V backplane to 1.2V/1.8V/3.3V for RFICs and FPGAs.

Use Value: 600kHz switching enables compact magnetics; thermal shutdown and hiccup mode ensure reliability under intermittent overload conditions typical in wireless infrastructure.

Set-Top Boxes & Gateways

Printers & Graphic Cards

Use Scenario: Multi-rail power management in residential broadband gateways supporting DOCSIS 3.1 and Wi-Fi 6.

IC Role / Device Role / Timing Role: Secondary buck regulator generating 1.0V CPU core, 1.2V DDR, and 3.3V interface rails from 12V input.

Use Value: ±1% feedback accuracy maintains SoC stability across temperature; soft-start prevents inrush-induced brownouts during cold boot.

Use Scenario: Power delivery to GPU VRMs and print engine controllers in multifunction printers and gaming graphics cards.

IC Role / Device Role / Timing Role: High-current (6A) buck stage supplying 1.2V–1.8V to GPU memory or ASIC logic blocks.

Use Value: Integrated 42mΩ/12.5mΩ MOSFETs achieve >90% efficiency at 5A load, minimizing thermal stress in space-constrained enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2451DT-LF-Z	3.3–36V input, 0.8–28V output, 0.6A max, 2MHz switching, no integrated low-side FET - requires external sync rectifier.	Lower current capability and no internal low-side switch limit use to sub-1A auxiliary rails, not main SoC supplies.	Select MP2451DT-LF-Z only for low-power auxiliary rails where 2MHz allows smaller inductors; not suitable as direct replacement for 6A loads.
TPS54620RGYR	4.5–17V input, 0.6–7V output, 6A, 600kHz, integrated FETs, but requires external compensation and lacks hiccup-mode protection.	Lacks foldback current limit and hiccup-mode - less robust under sustained short-circuit conditions in unattended equipment.	Choose TPS54620RGYR when external compensation is acceptable and thermal fault handling is managed at system level; verify layout for stability.

Compared with MP2451DT-LF-Z and TPS54620RGYR, the MIC26603-ZAYJL-TR uniquely combines 6A integrated power stage, adaptive ON-time control for no-external-compensation design, hiccup-mode short-circuit protection, and Any Capacitor® stability - making it optimal for space-constrained, high-reliability 4.5–28V input systems demanding fast transient response and minimal BOM count.

Availability

MIC26603-ZAYJL-TR is available at Aetrix Electronics and suitable for distributed power systems, communications infrastructure, and embedded computing applications requiring stable component supply, long-term lifecycle support, and guaranteed Pb-free compliance.

Supply support for MIC26603-ZAYJL-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

Micrel Inc. was a U.S.-based analog and mixed-signal semiconductor company founded in 1978 and acquired by Microchip Technology in 2015. It specialized in power management, timing, and interface ICs for industrial and communications markets.

The MIC26603-ZAYJL-TR belongs to Micrel's SuperSwitcher™ II family, designed specifically for high-efficiency, high-current DC-DC conversion in space-constrained telecom, networking, and consumer electronics where fast transient response and wide input range are critical.

FAQ

What is the maximum recommended output voltage for MIC26603-ZAYJL-TR?

The MIC26603-ZAYJL-TR is specified for adjustable output voltages from 0.6V to 5.5V. Operation above 5.5V is not supported due to internal ripple injection limits and line regulation degradation. The datasheet explicitly states "the maximum output voltage of the MIC26603-ZAYJL-TR should be limited to 5.5V" to maintain stability and accuracy across temperature and load.

Does MIC26603-ZAYJL-TR require external compensation components?

No, the MIC26603-ZAYJL-TR does not require external compensation components. Its adaptive ON-time control architecture with internal ripple-based sensing eliminates the need for external RC networks or type-II/type-III compensators. This simplifies design, reduces BOM count, and improves layout robustness - confirmed in the datasheet's "No external compensation" feature list and functional description.

How does MIC26603-ZAYJL-TR handle short-circuit conditions?

The MIC26603-ZAYJL-TR employs foldback current limiting and hiccup-mode protection. When output current exceeds the threshold (7.5–17A depending on FB voltage), it enters hiccup mode: shutting down, cooling, then attempting automatic restart. This prevents thermal runaway and enables self-recovery without manual intervention - a key safety feature documented in the Absolute Maximum Ratings and Functional Description sections.

Can MIC26603-ZAYJL-TR start up into a pre-biased output?

Yes, the MIC26603-ZAYJL-TR supports safe startup into a pre-biased output. This is explicitly listed as a feature ("Supports safe startup into a pre-biased load") and enabled by its control architecture, which avoids reverse current flow during enable. It is validated for use in hot-swap and multi-rail sequencing applications where downstream capacitors may retain charge before regulation begins.

What is the thermal resistance (θ_JA) of MIC26603-ZAYJL-TR in its QFN package?

The MIC26603-ZAYJL-TR has a junction-to-ambient thermal resistance (θ_JA) of 28°C/W when mounted on a standard 5-in², 4-layer FR-4 PCB with 2oz copper per layer. This value assumes proper thermal pad soldering and is measured under controlled lab conditions - actual θ_JA will vary with PCB layout, airflow, and nearby heat sources.

MIC26603-ZAYJL-TR Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: Hyper Speed Control®, SuperSwitcher II™

Package/Case:: 28-PowerVQFN

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 4.5V

Voltage - Input (Max):: 28V

Voltage - Output (Min/Fixed):: 0.6V

Voltage - Output (Max):: 5.5V

Current - Output:: 6A

Frequency - Switching:: 600kHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-QFN (5x6)

MIC26603-ZAYJL-TR FAQ

1.How can I place an order for MIC26603-ZAYJL-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for MIC26603-ZAYJL-TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MIC26603-ZAYJL-TR reliable?

The price and inventory of MIC26603-ZAYJL-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC26603-ZAYJL-TR is usually 5 days.

3.What payment methods are accepted for MIC26603-ZAYJL-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC26603-ZAYJL-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MIC26603-ZAYJL-TR?

MIC26603-ZAYJL-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MIC26603-ZAYJL-TR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MIC26603-ZAYJL-TR?

For technical support, including MIC26603-ZAYJL-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC26603-ZAYJL-TR requirements.

6.How does Aetrix verify that MIC26603-ZAYJL-TR is sourced from the original manufacturer or authorized distributors?

All MIC26603-ZAYJL-TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MIC26603-ZAYJL-TR meets industry standards.

7.What is the process for return or replacement of MIC26603-ZAYJL-TR?

All MIC26603-ZAYJL-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC26603-ZAYJL-TR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MIC26603-ZAYJL-TR part is unused and in its original packaging.

Return procedure for MIC26603-ZAYJL-TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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