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Microchip Technology MIC261203-ZAYJL-TR
- Part No.:
- MIC261203-ZAYJL-TR
- Manufacturer:
- Microchip Technology
- Package:
- 28-PowerVQFN
- Datasheet:
-
MIC261203-ZAYJL-TR.pdf
- Description:
- IC REG BUCK ADJ 12A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,694
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Product details
Overview
MIC261203-ZAYJL-TR from Micrel is a synchronous DC-to-DC buck regulator with Hyper Speed Control™ architecture, operating from 4.5V to 28V input and delivering up to 12A output current at adjustable 0.6V–5.5V with ±1% feedback accuracy and 600kHz fixed switching frequency. It integrates high- and low-side MOSFETs (RDS(ON) = 13mΩ / 5.3mΩ), supports pre-biased startup, and targets point-of-load regulation in telecom infrastructure and graphics cards.
For engineers reviewing the MIC261203-ZAYJL-TR datasheet, MIC261203-ZAYJL-TR pinout, MIC261203-ZAYJL-TR application, or MIC261203-ZAYJL-TR equivalent, key selection criteria include its adaptive on-time control for fast transient response, Any Capacitor® stability without external compensation, thermal shutdown at 160°C, and 28-pin 5mm × 6mm QFN package with dedicated PVIN, SW, BST, and PGND routing requirements.
Technical Context
The MIC261203-ZAYJL-TR implements an adaptive on-time control architecture that estimates tON based on VOUT/VIN ratio to maintain ~600kHz switching frequency while enabling ultra-fast load transients. Its control loop uses output voltage ripple-rather than inductor current-to trigger on-time, eliminating slope compensation and supporting zero-to-high ESR output capacitors.
It integrates dual N-channel MOSFETs with internal gate drivers powered by VDD (5V LDO) and BST bootstrap circuitry; the low-side RDS(ON) enables current sensing during off-time for foldback current limiting and hiccup-mode short-circuit protection without external sense resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V - supports wide-input industrial and telecom rails including 12V and 24V systems. |
| Output Current | Up to 12A - sufficient for GPU core or FPGA I/O rail power delivery with thermal derating above 85°C ambient. |
| Output Voltage Range | 0.6V to 5.5V - adjustable via resistor divider on FB pin; 0.6V reference enables sub-1V CPU core supplies. |
| Feedback Accuracy | ±1% at 0°C–85°C - ensures tight regulation for sensitive digital loads without post-regulation. |
| Switching Frequency | 600kHz (typ.) - balances efficiency, size, and EMI; varies ±150kHz with input/output conditions. |
| Integrated FETs | High-side RDS(ON) = 13mΩ, low-side = 5.3mΩ - reduces conduction loss and eliminates external MOSFET layout complexity. |
| Thermal Shutdown | 160°C junction - protects against sustained overload or poor heatsinking; 15°C hysteresis prevents oscillation. |
Pinout & Package
Package: 28-pin 5mm × 6mm QFN (JL), exposed thermal pad, Pb-free, –40°C to +125°C junction temperature rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVDD (Pin 1) | Internal LDO output for gate drive | Supplies high-side driver; must be decoupled with 2.2µF ceramic 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 caps; requires low-inductance polygon pour separate from SGND. |
| SW (Pins 4,9–12) | Switch node | Connects high-side drain and low-side source; high dv/dt node requiring short, isolated trace routing away from analog signals. |
| PVIN (Pins 13–19) | Main power input | Accepts 4.5V–28V; multiple pins reduce impedance; requires local 10µF+ ceramic input capacitance to PGND. |
| BST (Pin 20) | Bootstrap supply for high-side driver | Requires 0.1µF capacitor to SW and Schottky diode from PVDD; series resistor optional to tune turn-on speed. |
| CS (Pin 22) | Current sense input | Monitors low-side MOSFET VDS during off-time for overcurrent protection; Kelvin connection to SW required for accuracy. |
| FB (Pin 24) | Feedback input | Regulated to 0.6V; sets output voltage via R1/R2 divider; bias current < 50nA minimizes divider error. |
| PG (Pin 25) | Power Good open-drain output | Asserts high when VOUT ≥ 92% of nominal; requires external pull-up to VDD (≥10kΩ). |
| EN (Pin 26) | Enable control | CMOS-compatible; logic high enables regulation, low shuts down IC to 5µA quiescent current. |
| VIN (Pin 27) | Analog supply input | Provides bias for control circuitry; bypass with 1µF ceramic to SGND; not used for power path. |
| VDD (Pin 28) | Internal 5V LDO output | Supplies control logic and gate drivers; regulated from VIN; tie to PVIN if VIN < 5.5V; bypass with 1µF ceramic to SGND. |
Key Features
| Feature | Design Value |
|---|---|
| Hyper Speed Control™ architecture | Enables stable operation at extreme input-to-output ratios (e.g., 28V → 0.6V) with <10µs load transient recovery and reduced output capacitance. |
| Any Capacitor® stability | Operates with ceramic, polymer, or electrolytic output capacitors across full ESR range (0–100mΩ), eliminating need for external compensation network. |
| Integrated current sensing | Uses low-side MOSFET RDS(ON) for foldback current limit and hiccup-mode short-circuit protection-no external sense resistor or PCB area penalty. |
| Pre-biased load startup | Safely ramps output from non-zero initial voltage without reverse current flow, critical for hot-swap and multi-rail sequencing applications. |
| Internal soft-start | 5ms monotonic VOUT ramp via 0.6V reference voltage staircase, limiting inrush current into bulk output capacitance. |
Applications
| Distributed POL in Telecom Infrastructure | Graphics Card Core Power |
|---|---|
Use Scenario: Regulating 12V or 24V backplane supply to 0.8–1.2V for ASIC/FPGA cores in 5G baseband units or optical line cards. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing dynamic load steps up to 8A/µs with minimal output voltage deviation. Use Value: Hyper Speed Control™ achieves <15mV undershoot under 10A step load, reducing required output capacitance by 40% versus fixed-frequency alternatives. | Use Scenario: Delivering tightly regulated 1.05V/12A to GPU memory interface or shader cores in gaming or AI accelerator cards. IC Role / Device Role / Timing Role: High-current POL regulator with integrated FETs and thermal monitoring, synchronized to system power sequencing. Use Value: 5mm × 6mm QFN package with exposed thermal pad enables >8W dissipation in constrained board space; ±1% accuracy maintains GPU timing margins. |
| Network Router CPU Supply | Industrial PLC I/O Module |
Use Scenario: Generating 1.8V/10A for multi-core ARM or x86 network processors in enterprise routers with strict thermal limits. IC Role / Device Role / Timing Role: Main processor core supply with Power Good signaling to enable downstream reset management and firmware boot validation. Use Value: PG output asserts within 100µs of VOUT reaching 92% of target, ensuring deterministic boot sequence timing. | Use Scenario: Providing 3.3V/8A to isolated I/O banks in programmable logic controllers operating in –40°C to +85°C industrial environments. IC Role / Device Role / Timing Role: Robust, wide-input buck regulator supporting unregulated 24V DC field wiring with brownout immunity via UVLO on PVIN and VDD. Use Value: –40°C to +125°C junction rating and 28V absolute max input withstand surges common in factory automation wiring. |
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 | 3A rated, 2MHz switching, no integrated low-side FET; requires external MOSFET and compensation. | Targeted at lower-current, space-constrained apps; lacks hiccup-mode protection and pre-bias startup. | Select when output current ≤3A and board area favors smaller 8-pin SOIC; avoid for >5A or telecom-grade reliability. |
| TPS54560QDGQRQ1 | 60V max input, 5A output, current-mode control; includes spread-spectrum EMI reduction and adjustable soft-start. | Designed for automotive 12V/24V systems with load dump tolerance; lacks Hyper Speed Control™ transient performance. | Choose for high-input-voltage automotive use or where EMI compliance is primary; not drop-in for MIC261203-ZAYJL-TR's 12A telecom POL role. |
Compared with MP2451DT-LF-Z and TPS54560QDGQRQ1, MIC261203-ZAYJL-TR delivers 2.4× higher current in the same footprint, enables faster transient response via adaptive on-time control, and integrates full protection features-including hiccup-mode short-circuit handling-without external components.
Availability
MIC261203-ZAYJL-TR is available at Aetrix Electronics and suitable for distributed point-of-load regulation, telecom infrastructure power conversion, and graphics card core supply requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for MIC261203-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, specializing in power management, timing, and interface ICs before its acquisition by Microchip Technology in 2015.
The MIC261203-ZAYJL-TR belongs to Micrel's SuperSwitcher™ II family of high-current synchronous buck regulators, designed specifically for high-efficiency, low-noise, and fast-transient point-of-load applications in networking, computing, and industrial equipment.
FAQ
What is the maximum continuous output current capability of the MIC261203-ZAYJL-TR under typical conditions?
The MIC261203-ZAYJL-TR delivers up to 12A continuous output current when mounted on a 5-inch² 4-layer FR-4 PCB with 2oz copper and operated at 25°C ambient. Derating begins above 85°C ambient due to thermal limits; at 100°C ambient, maximum output drops to ~8A per thermal curves in the datasheet. The device's 13mΩ/5.3mΩ integrated MOSFETs and 28-pin QFN package with exposed thermal pad enable this high current density without external FETs.
Does the MIC261203-ZAYJL-TR require external compensation components for stability?
No, the MIC261203-ZAYJL-TR does not require external compensation components. Its Hyper Speed Control™ architecture and Any Capacitor® design ensure stability with any output capacitor type (ceramic, polymer, or electrolytic) and ESR from 0mΩ to 100mΩ. The control loop uses adaptive on-time modulation and internal ripple sensing, eliminating the need for external RC networks or type-II/type-III compensators typically required in voltage-mode or current-mode controllers.
How does the MIC261203-ZAYJL-TR handle short-circuit faults?
The MIC261203-ZAYJL-TR employs foldback current limiting and "hiccup mode" short-circuit protection. When output current exceeds the threshold (e.g., 26A at 25°C), it disables switching, enters a 5ms soft-start restart cycle, and repeats until fault clears. This limits average power dissipation and prevents thermal runaway. The current sense uses the low-side MOSFET's RDS(ON), avoiding external resistors and parasitic errors. Hiccup mode is confirmed in the Electrical Characteristics table under Short-Circuit Protection.
Can the MIC261203-ZAYJL-TR safely start up into a pre-biased output voltage?
Yes, the MIC261203-ZAYJL-TR supports safe startup into a pre-biased output. Its control architecture prevents reverse current flow during initial ramp by disabling the high-side MOSFET until the feedback voltage rises above the 0.6V reference. This feature is explicitly listed in the Features section and validated in Application Information, making it suitable for hot-swap and multi-rail sequencing where downstream circuitry may already be powered.
What is the function of the BST pin on the MIC261203-ZAYJL-TR, and what external components are required?
The BST pin on the MIC261203-ZAYJL-TR provides the bootstrap voltage for the high-side N-channel MOSFET gate driver. It requires a 0.1µF ceramic capacitor connected between BST and SW pins, plus a Schottky diode (anode to PVDD, cathode to BST) to charge the capacitor during low-side conduction. A small series resistor (optional) can be added at the BST pin to control high-side turn-on speed and reduce EMI. These requirements are specified in the Pin Description and Functional Diagram sections of the datasheet.
MIC261203-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:
- 12A
- 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)
MIC261203-ZAYJL-TR FAQ
1.How can I place an order for MIC261203-ZAYJL-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC261203-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 MIC261203-ZAYJL-TR reliable?
The price and inventory of MIC261203-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 MIC261203-ZAYJL-TR is usually 5 days.
3.What payment methods are accepted for MIC261203-ZAYJL-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC261203-ZAYJL-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC261203-ZAYJL-TR?
MIC261203-ZAYJL-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC261203-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 MIC261203-ZAYJL-TR?
For technical support, including MIC261203-ZAYJL-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC261203-ZAYJL-TR requirements.
6.How does Aetrix verify that MIC261203-ZAYJL-TR is sourced from the original manufacturer or authorized distributors?
All MIC261203-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 MIC261203-ZAYJL-TR meets industry standards.
7.What is the process for return or replacement of MIC261203-ZAYJL-TR?
All MIC261203-ZAYJL-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC261203-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 MIC261203-ZAYJL-TR part is unused and in its original packaging.
Return procedure for MIC261203-ZAYJL-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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