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Microchip Technology MIC26901YJL-TR
- Part No.:
- MIC26901YJL-TR
- Manufacturer:
- Microchip Technology
- Package:
- 28-PowerVQFN
- Datasheet:
-
MIC26901YJL-TR.pdf
- Description:
- IC REG BUCK ADJ 9A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,598
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Product details
Overview
MIC26901YJL-TR from Micrel is a synchronous step-down DC/DC buck regulator with adaptive on-time control, delivering up to 9A output current across 4.5V–28V input and adjustable 0.8V–5.5V output. It features ±1% feedback accuracy, 600kHz switching frequency, Hyper Speed Control™ architecture for fast transient response, and integrated 5V VDD/PVDD LDOs. Used in communications infrastructure power rails requiring high VIN-to-low VOUT conversion.
For engineers reviewing the MIC26901YJL-TR datasheet, MIC26901YJL-TR pinout, MIC26901YJL-TR application, or MIC26901YJL-TR equivalent, key selection criteria include its 28-pin MLF® package, internal MOSFET RDS(ON) of 27mΩ (high-side) and 10.5mΩ (low-side), hiccup-mode short-circuit protection, Power Good (PG) open-drain output, and support for pre-biased startup - all critical for high-density, thermally constrained board designs.
Technical Context
The MIC26901YJL-TR implements an adaptive on-time control architecture that estimates tON based on VIN/VOUT ratio to maintain ~600kHz nominal switching frequency while enabling ultra-fast load transient recovery without external compensation. Its control loop senses feedback voltage ripple proportional to inductor current ripple, eliminating need for slope compensation.
It integrates dual internal LDOs: VDD (5V, 40mA) powers core logic and gate drivers; PVDD (5V, derived from VIN) supplies high-side MOSFET gate drive. Protection includes foldback current limit (12.5–20A threshold), thermal shutdown at 160°C, undervoltage lockout on VDD, and open-drain PG output asserting at 92% VOUT with 5.5% hysteresis.
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 28V bus systems. |
| Output Current | Up to 9A continuous - enables single-regulator solutions for FPGA core, ASIC, or SoC power domains. |
| Output Voltage Range | Adjustable 0.8V to 5.5V - covers DDR memory, CPU cores, DSPs, and I/O rails with ±1% reference accuracy. |
| Switching Frequency | 600kHz typical - balances EMI, efficiency, and inductor size; varies <±150kHz with VIN, VOUT, and load. |
| Internal MOSFET RDS(ON) | High-side: 27mΩ, Low-side: 10.5mΩ - reduces conduction loss and thermal stress at full 9A load. |
| Thermal Resistance θJA | 28°C/W - measured on 5-in² 4-layer FR-4 PCB; enables 9A operation up to +85°C ambient with proper layout. |
| Protection Features | Foldback current limit, hiccup-mode short-circuit, thermal shutdown, UVLO, soft-start, and PG monitoring - ensures robust fault handling without external circuitry. |
Pinout & Package
Package: 28-pin 5mm × 6mm MLF® (exposed thermal pad), Pb-free, RoHS-compliant. Thermal pad must be soldered to PCB ground plane for optimal heat dissipation and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVDD (Pin 1) | Internal 5V LDO output for high-side gate drive | Must be decoupled with 2.2µF ceramic capacitor to PGND; tied to PVIN if VIN < 5.5V. |
| SW (Pins 4,9–12) | Switch node (HS source / LS drain) | High-dI/dt node; requires short, low-inductance routing away from sensitive signals and feedback traces. |
| PGND (Pins 2,5–8,21) | Power ground return path | Connects to MOSFET sources, input/output capacitor negatives, and thermal pad; separate from SGND loop. |
| PVIN (Pins 13–19) | Main input power (4.5V–28V) | Multiple pins reduce IR drop and improve thermal spreading; requires local bulk + ceramic input capacitors. |
| BST (Pin 20) | Bootstrap supply for high-side driver | 0.1µF capacitor to SW; Schottky diode from PVDD to BST required for bootstrapping. |
| CS (Pin 22) | Current sense input | Monitors low-side MOSFET VDS during off-time for overcurrent; requires Kelvin connection to SW and PGND. |
| SGND (Pin 23) | Signal ground reference | Must connect directly to ground plane; never routed to PGND pad on top layer per layout guidelines. |
| FB (Pin 24) | Feedback input (0.8V reference) | Resistor divider sets output voltage; 50nA bias current enables high-impedance dividers. |
| PG (Pin 25) | Open-drain Power Good output | Asserts high when VOUT > 92% nominal; requires external pull-up ≥10kΩ to VDD. |
| EN (Pin 26) | Enable control input | CMOS-compatible; logic high enables regulation, low shuts down IC (5µA quiescent). |
| VIN (Pin 27) | Logic supply input | Bypassed with 1.0µF ceramic to SGND; powers internal logic and EN interface. |
| VDD (Pin 28) | Internal 5V LDO output for logic & gate drive | Decoupled with 1.0µF ceramic to PGND; tied to PVIN if VIN < 5.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Hyper Speed Control™ architecture | Enables stable operation at extreme VIN/VOUT ratios (e.g., 28V→0.8V) with minimal output capacitance and no external compensation. |
| Any Capacitor™ stability | Operates stably with zero-to-high ESR output capacitors - eliminates need for specific low-ESR polymer/tantalum types. |
| Integrated dual LDOs (VDD & PVDD) | Eliminates external 5V bias supplies; VDD powers logic/EN, PVDD drives high-side gate - simplifies BOM and layout. |
| Pre-biased output startup support | Allows safe turn-on into existing output voltage - essential for hot-swap and sequencing-critical systems. |
| Internal current sensing | Uses low-side MOSFET RDS(ON) for foldback current limit and hiccup-mode short-circuit protection - no sense resistor required. |
Applications
| Distributed Power Systems | Communications Infrastructure |
|---|---|
Use Scenario: Point-of-load regulation in 48V intermediate bus architectures feeding 12V/5V/3.3V/1.8V rails for line cards and baseband units. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current, high-efficiency conversion with fast transient response to burst traffic loads. Use Value: Enables compact, thermally efficient design with only two external MOSFETs (integrated), reducing solution size by >30% vs. controller+driver+MOSFET discrete solutions. |
Use Scenario: Core voltage regulation for network processors, switch ASICs, and optical module controllers in routers and switches. IC Role / Device Role / Timing Role: High-accuracy, high-current DC/DC converter providing tightly regulated 0.8V–1.2V outputs with ±1% tolerance and sub-100µs transient recovery. Use Value: Maintains signal integrity under dynamic load steps via Hyper Speed Control™, minimizing voltage droop and avoiding system resets. |
| Set-Top Boxes & Gateways | Graphics & Video Processing |
Use Scenario: Multi-rail power delivery for ARM-based SoCs, DDR memory, and tuners in consumer broadband gateways. IC Role / Device Role / Timing Role: Adjustable-output buck regulator supplying 1.1V CPU core, 1.5V DDR, and 3.3V I/O rails from a single 12V input. Use Value: Reduces bill-of-materials count and PCB area through integrated power stage and no external compensation components. |
Use Scenario: GPU core and memory rail regulation in embedded video processing boards and digital signage controllers. IC Role / Device Role / Timing Role: High-current (up to 9A), low-noise synchronous buck supplying 0.9V–1.2V GPU cores with tight load regulation (<0.25%). Use Value: Delivers >95% peak efficiency at 12V input, lowering thermal load and enabling fanless enclosure designs. |
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 (Monolithic Power) | 3A max output, 2MHz fixed frequency, smaller 8-pin SOIC package; lacks PG, pre-bias startup, and hiccup-mode protection. | Suitable for lower-current, space-constrained applications where 9A capability and advanced protection are not required. | Select MP2451DT-LF-Z only for ≤3A loads and simplified protection requirements; not a functional replacement for MIC26901YJL-TR's 9A/28V capability. |
| TPS549D22RUKR (Texas Instruments) | 9A, 2.2MHz, D-CAP3 control, integrated FETs, but requires external compensation and has narrower 4.5V–18V input range. | Optimized for high-frequency, low-inductance designs; less suitable for 24V/28V input telecom systems. | Choose TPS549D22RUKR for high-switching-frequency designs needing fast transient response below 18V input; MIC26901YJL-TR remains preferred for 24V–28V industrial inputs. |
Compared with MP2451DT-LF-Z and TPS549D22RUKR, the MIC26901YJL-TR uniquely combines 28V input rating, 9A output, Hyper Speed Control™ for ultrafast transients, and full protection suite in a thermally optimized MLF® package - making it the only option validated for high-VIN, high-current, high-reliability distributed power systems.
Availability
MIC26901YJL-TR is available at Aetrix Electronics and suitable for communications infrastructure, set-top box power supplies, and graphics card VRMs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MIC26901YJL-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 MIC26901YJL-TR belongs to Micrel's SuperSwitcher II™ family of synchronous buck regulators, designed specifically for high-efficiency, high-current point-of-load conversion in telecom, networking, and industrial equipment with wide input voltage ranges.
FAQ
What is the maximum input voltage supported by the MIC26901YJL-TR?
The MIC26901YJL-TR supports an absolute maximum PVIN voltage of +29V, with recommended operating range from 4.5V to 28V. Exceeding 28V may trigger overvoltage protection or degrade reliability; operation at 28V is fully characterized for 9A output with thermal derating above +85°C ambient.
Does the MIC26901YJL-TR require external compensation components?
No, the MIC26901YJL-TR uses adaptive on-time control with internal ripple-based sensing and does not require external compensation components. Its Hyper Speed Control™ architecture achieves stability across zero-to-high ESR output capacitors without loop compensation networks.
How does the MIC26901YJL-TR handle short-circuit conditions?
The MIC26901YJL-TR employs hiccup-mode short-circuit protection: upon detecting >12.5A current (typical), it disables switching, waits a recovery period, then attempts restart. This limits average power dissipation and prevents thermal runaway during sustained faults.
Can the MIC26901YJL-TR start up into a pre-biased output voltage?
Yes, the MIC26901YJL-TR supports safe startup into a pre-biased output. Its control architecture prevents reverse current flow and ensures monotonic voltage ramp-up even when VOUT is initially non-zero - critical for hot-swap and power sequencing applications.
What is the thermal performance of the MIC26901YJL-TR in a standard PCB layout?
On a 5-square-inch, 4-layer FR-4 PCB with 2oz copper, the MIC26901YJL-TR has θJA = 28°C/W. At 9A output and 12V input, junction temperature rise is ~50°C above ambient, allowing full-rated operation up to +85°C ambient with proper thermal pad soldering and airflow.
MIC26901YJL-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):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 9A
- 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)
MIC26901YJL-TR FAQ
1.How can I place an order for MIC26901YJL-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC26901YJL-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 MIC26901YJL-TR reliable?
The price and inventory of MIC26901YJL-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC26901YJL-TR is usually 5 days.
3.What payment methods are accepted for MIC26901YJL-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC26901YJL-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC26901YJL-TR?
MIC26901YJL-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC26901YJL-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 MIC26901YJL-TR?
For technical support, including MIC26901YJL-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC26901YJL-TR requirements.
6.How does Aetrix verify that MIC26901YJL-TR is sourced from the original manufacturer or authorized distributors?
All MIC26901YJL-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 MIC26901YJL-TR meets industry standards.
7.What is the process for return or replacement of MIC26901YJL-TR?
All MIC26901YJL-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC26901YJL-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 MIC26901YJL-TR part is unused and in its original packaging.
Return procedure for MIC26901YJL-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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