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Microchip Technology MIC26950YJL-TR
- Part No.:
- MIC26950YJL-TR
- Manufacturer:
- Microchip Technology
- Package:
- 28-PowerVQFN
- Datasheet:
-
MIC26950YJL-TR.pdf
- Description:
- IC REG BUCK ADJ 12A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,884
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Product details
Overview
MIC26950YJL-TR from Micrel is a 12A synchronous step-down DC-DC buck regulator with Hyper Speed Control™ architecture, operating from 4.5V to 26V input and delivering adjustable output down to 0.8V (±1% accuracy) at up to 300kHz switching frequency. It integrates high-side and low-side N-channel MOSFETs (RDS(ON) = 17mΩ / 6mΩ), supports pre-biased start-up, and targets high-efficiency point-of-load conversion in communications infrastructure and embedded systems.
For engineers reviewing the MIC26950YJL-TR datasheet, MIC26950YJL-TR pinout, MIC26950YJL-TR application, or MIC26950YJL-TR equivalent, key selection criteria include its adaptive ON-time control for fast transient response, Any Capacitor™ stability across ESR ranges, internal soft-start (6ms), hiccup-mode short-circuit protection, and thermal shutdown at 155°C - all in a 28-pin 5mm × 6mm MLF® package.
Technical Context
The MIC26950YJL-TR employs a digitally modified adaptive ON-time control scheme that estimates tON as VOUT/VIN × (1/300kHz), enabling fixed-frequency operation while retaining rapid load-step response. Its control loop uses feedback voltage ripple (20–100mV recommended) sensed at the FB pin to trigger switching, eliminating need for slope compensation.
Over-current protection is implemented via internal low-side MOSFET RDS(ON) sensing, with foldback current limit (13.2–27A) dependent on FB voltage and "hiccup" mode activation during hard shorts. Thermal management includes 36°C/W θJA, over-temperature shutdown at 155°C with 10°C hysteresis, and junction temperature rating of −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 26V - supports wide industrial and telecom supply rails including 12V, 24V bus systems. |
| Output Voltage | Adjustable 0.8V to 5.5V (±1% typ.) - enables precise core voltage regulation for FPGAs, ASICs, and microprocessors. |
| Max Output Current | 12A continuous - delivers high power density without external current-sense resistor or external MOSFETs. |
| Switching Frequency | 300kHz (225–375kHz range) - balances efficiency, EMI, and inductor size; stable across input/output conditions. |
| Internal MOSFETs | High-side RDS(ON) = 17mΩ, low-side RDS(ON) = 6mΩ - minimizes conduction loss and improves full-load efficiency up to 95%. |
| Soft-Start Time | 6ms internal - limits inrush current during power-up, preventing input rail sag and stress on input capacitors. |
| Protection Features | UVLO (2.7V typ.), foldback current limit, hiccup-mode short-circuit, thermal shutdown (155°C) - ensures robust fault recovery in unattended systems. |
Pinout & Package
Package: 28-pin 5mm × 6mm MLF® (exposed thermal pad), Pb-free, RoHS-compliant. Thermal resistance θJA = 36°C/W on standard 4-layer FR-4 PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 13–19 (PVIN) | Power Input High-Side Drain | Connects to input bulk capacitor bank; must be decoupled directly to PGND with low-ESR ceramics. |
| 24 (EN) | Enable Control Input | CMOS-compatible logic enable: high/floating = active, low = shutdown (IQ ≈ 0.8mA). |
| 25 (FB) | Feedback Reference Input | Senses output via resistor divider; regulated to 0.8V reference; requires 20–100mV ripple for stable operation. |
| 26 (SGND) | Signal Ground Reference | Must connect directly to clean ground plane - isolated from PGND to prevent noise coupling into control loop. |
| 27 (VDD) | Bias Supply Input | 4.5–5.5V internal bias rail; requires 2.2µF ceramic cap to PGND for stable gate drive and reference generation. |
| 2,5,6,7,8,21 (PGND) | Power Ground Return | Low-impedance return path for both MOSFETs and input/output capacitors; must be routed separately from SGND. |
| 22 (CS) | Current Sense Input | Monitors low-side MOSFET voltage during OFF-time for current limiting; sensitive to layout-induced noise. |
| 20 (BST) | Bootstrap Voltage Output | Drives high-side gate via 0.1µF BST capacitor; requires Schottky diode from VDD to BST for charge replenishment. |
| 4,9,10,11,12 (SW) | Switch Node Output | Connection point between internal high-side drain and low-side source; critical for EMI and thermal layout. |
| 23 (VIN) | VDD Bias Supply Input | Provides clean 4.5–5.5V to VDD section; bypassed to SGND with local ceramic capacitor. |
| 1,3,28 (NC) | No Connect | Not internally bonded; leave unconnected and un-routed to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Hyper Speed Control™ Architecture | Enables ultra-fast transient response and stable operation with high VIN/low VOUT ratios (e.g., 26V → 0.8V) without external compensation. |
| Any Capacitor™ Stability | Operates stably with zero-ESR (e.g., POSCAP) to high-ESR (e.g., aluminum electrolytic) output capacitors - simplifies BOM and reduces design risk. |
| Integrated Power Stage | On-die 17mΩ/6mΩ N-channel MOSFET pair eliminates external switches and driver ICs - reduces footprint and component count. |
| Safe Pre-Biased Start-Up | Allows reliable turn-on when output rail is already charged - essential for hot-swap and redundant power systems. |
| Internal Compensation | Eliminates need for external compensation network - accelerates design cycle and improves consistency across production units. |
Applications
| Distributed Power Systems | Communications Infrastructure |
|---|---|
Use Scenario: Point-of-load regulation in modular server PSUs delivering 1.2V/10A to CPU cores. IC Role / Device Role / Timing Role: Primary synchronous buck regulator managing dynamic load transients with <100µs recovery time. Use Value: Delivers 95% peak efficiency at 12V input and 1.2V/12A output while maintaining ±1% regulation under 6A/µs load steps. | Use Scenario: Midplane power conversion in 1RU telecom switches requiring 3.3V/8A from 12V backplane. IC Role / Device Role / Timing Role: Fixed-frequency buck controller with hiccup-mode protection against cable shorts and connector faults. Use Value: Eliminates need for external current-sense resistor and reduces solution size by 35% vs. controller+MOSFET discrete designs. |
| Set-Top Box & Gateways | Graphics & Video Cards |
Use Scenario: Core voltage regulation for ARM-based SoCs in residential gateways with variable 5–12V adapter inputs. IC Role / Device Role / Timing Role: Adjustable-output buck converter supporting 0.8V–5.5V range with internal soft-start and UVLO. Use Value: Enables single-design reuse across multiple product SKUs via resistor-divider programming - no firmware or layout changes required. | Use Scenario: GPU memory I/O voltage (1.35V/10A) in compact PCIe video cards with strict thermal envelope. IC Role / Device Role / Timing Role: Thermally optimized buck regulator using exposed-pad MLF package and PGND/SGND separation. Use Value: Achieves 12A output with <100°C die rise at 75°C ambient - meets thermal derating curves for fanless 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 |
|---|---|---|---|
| MP8765GQ-Z | 4.5–18V input, 12A, 500kHz, integrated MOSFETs (RDS(ON) 7.5/3.5mΩ), no pre-bias start-up support | Better efficiency above 12V input but limited to 18V max; lacks hiccup-mode short-circuit recovery | Select MP8765GQ-Z only if input stays ≤18V and pre-bias operation is unnecessary. |
| TPS546D24RSAR | 4–18V input, 15A, 350–1000kHz programmable, PMBus interface, external compensation | Offers digital telemetry and multi-phase capability but requires external MOSFETs and complex layout | Choose TPS546D24RSAR when system-level monitoring, sequencing, or >12A scalability is required. |
Compared with MP8765GQ-Z and TPS546D24RSAR, the MIC26950YJL-TR provides broader 4.5–26V input tolerance, native pre-biased start-up, and simpler analog implementation - making it optimal for cost-sensitive, thermally constrained, or high-VIN industrial applications where digital control adds no value.
Availability
MIC26950YJL-TR is available at Aetrix Electronics and suitable for distributed power systems, communications infrastructure, and embedded graphics applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MIC26950YJL-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. Known for high-performance power management and timing solutions.
The MIC26950YJL-TR belongs to Micrel's SuperSwitcher II™ family of high-current synchronous buck regulators, designed specifically for high-efficiency, high-transient-response DC-DC conversion in space-constrained industrial and networking equipment.
FAQ
What is the minimum output voltage supported by the MIC26950YJL-TR?
The MIC26950YJL-TR supports an adjustable output voltage down to 0.8V with ±1% typical accuracy across −40°C to +125°C junction temperature. This is enforced by the internal 0.8V feedback reference voltage (VREF) at the FB pin, which sets the lower bound of the resistor-divider ratio. Operation below 0.8V is not specified or guaranteed.
Does the MIC26950YJL-TR require external compensation components?
No, the MIC26950YJL-TR features internal compensation, eliminating the need for external Type-II or Type-III compensation networks. Its adaptive ON-time control architecture and integrated transconductance amplifier are factory-tuned for stability with standard output capacitor types - reducing design complexity and board area.
Can the MIC26950YJL-TR safely start up into a pre-biased output voltage?
Yes, the MIC26950YJL-TR explicitly supports safe start-up into a pre-biased output. Its control architecture prevents reverse current flow during startup by disabling the high-side MOSFET until the internal reference ramps up, ensuring compatibility with hot-swap and redundant power architectures where the output rail may already be energized.
What is the purpose of the CS pin on the MIC26950YJL-TR?
On the MIC26950YJL-TR, the CS (Current Sense) pin monitors the voltage across the internal low-side MOSFET during its OFF-time to implement cycle-by-cycle over-current protection. It enables accurate current limiting without an external sense resistor, with threshold varying from 13.2A to 27A depending on FB voltage - providing foldback behavior during overload conditions.
How does the MIC26950YJL-TR achieve stability with different output capacitor ESR values?
The MIC26950YJL-TR achieves stability across zero-ESR to high-ESR capacitors via its Hyper Speed Control™ architecture and Any Capacitor™ design. It senses feedback voltage ripple (not current) and requires 20–100mV peak-to-peak ripple at the FB pin - achievable with proper capacitor selection or optional ripple injection - enabling robust loop control regardless of output capacitor ESR.
MIC26950YJL-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):
- 26V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 12A
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (5x6)
MIC26950YJL-TR FAQ
1.How can I place an order for MIC26950YJL-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC26950YJL-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 MIC26950YJL-TR reliable?
The price and inventory of MIC26950YJL-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC26950YJL-TR is usually 5 days.
3.What payment methods are accepted for MIC26950YJL-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC26950YJL-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC26950YJL-TR?
MIC26950YJL-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC26950YJL-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 MIC26950YJL-TR?
For technical support, including MIC26950YJL-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC26950YJL-TR requirements.
6.How does Aetrix verify that MIC26950YJL-TR is sourced from the original manufacturer or authorized distributors?
All MIC26950YJL-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 MIC26950YJL-TR meets industry standards.
7.What is the process for return or replacement of MIC26950YJL-TR?
All MIC26950YJL-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC26950YJL-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 MIC26950YJL-TR part is unused and in its original packaging.
Return procedure for MIC26950YJL-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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