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Microchip Technology MIC26903YJL-TR
- Part No.:
- MIC26903YJL-TR
- Manufacturer:
- Microchip Technology
- Package:
- 28-PowerVQFN
- Datasheet:
-
MIC26903YJL-TR.pdf
- Description:
- IC REG BUCK ADJ 9A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:136
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Product details
Overview
MIC26903YJL-TR from Micrel is a synchronous step-down DC/DC buck regulator with adaptive on-time control, operating from 4.5V to 28V input and delivering up to 9A output current at adjustable voltages down to 0.8V. It integrates dual N-channel MOSFETs (27 mΩ high-side, 10.5 mΩ low-side), features Hyper Light Load™ architecture for 80% efficiency at 10mA, and includes Power Good (PG) output and internal 5V LDO for gate drive (PVDD/VDD). It is used in telecom power supplies and graphics card VRMs.
For engineers reviewing the MIC26903YJL-TR datasheet, MIC26903YJL-TR pinout, MIC26903YJL-TR application, or MIC26903YJL-TR equivalent, key selection criteria include its 600kHz fixed-frequency operation in CCM, discontinuous-mode light-load efficiency, ±1% FB reference accuracy, Any Capacitor™ stability support, and 5mm × 6mm MLF® package thermal performance.
Technical Context
The MIC26903YJL-TR employs adaptive on-time control with a fixed 600kHz nominal switching frequency in continuous conduction mode (CCM), using an internal 0.8V reference and transconductance amplifier for feedback regulation. Its zero-cross comparator enables automatic transition to discontinuous conduction mode (DCM) under light loads, reducing quiescent current to 450 µA while maintaining fast transient response.
It integrates a 5V internal LDO powering both control circuitry (VDD) and gate drivers (PVDD), supports safe startup into pre-biased outputs, and implements foldback current limiting with hiccup-mode short-circuit protection triggered at 12.5–20A depending on junction temperature. The BST bootstrapped high-side driver requires a 0.1µF capacitor between BST and SW pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V - supports wide-range industrial and telecom inputs without external pre-regulation |
| Output Current | Up to 9A - sufficient for GPU core rails and high-power FPGA I/O domains |
| Switching Frequency | 600kHz (typ.) - balances EMI, inductor size, and efficiency across load range |
| Feedback Reference | 0.8V ±1% (−40°C to +85°C) - enables precise output voltage setting with minimal drift |
| Efficiency @ 10mA | Up to 80% - achieved via Hyper Light Load™ DCM operation, critical for standby power budgets |
| Thermal Range | −40°C to +125°C junction - qualified for harsh environments including base station power stages |
| Package | 28-pin 5mm × 6mm MLF® - exposes thermal pad for PCB heat sinking; θJA = 28°C/W on 5-in² 4-layer board |
Pinout & Package
Package: 28-pin 5mm × 6mm MLF® (exposed thermal pad), RoHS-compliant Pb-free finish. Thermal pad must be soldered to inner ground plane for optimal power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVDD (Pin 1) | Internal LDO output for gate drive | Supplies high-side MOSFET driver; requires 2.2µF ceramic cap to PGND; tie to PVIN if VIN < 5.5V |
| SW (Pins 4,9–12) | Switch node | Connection point of internal high-side source and low-side drain; high dv/dt node requiring short, isolated routing |
| PGND (Pins 2,5–8,21) | Power ground return | Low-impedance path for MOSFET sources, input/output caps, and gate drive return; separate from SGND |
| PVIN (Pins 13–19) | Main power input | 4.5V–26V supply for power stage; requires local input capacitance with low ESL layout |
| BST (Pin 20) | Bootstrap supply | Drives high-side gate via 0.1µF capacitor to SW; Schottky diode required from PVDD to BST |
| CS (Pin 22) | Current sense input | Monitors low-side RDS(ON) during OFF-time for overcurrent protection; Kelvin connection recommended |
| SGND (Pin 23) | Signal ground | Reference for FB, EN, PG, VDD; must connect directly to ground plane-no top-layer trace to PGND |
| FB (Pin 24) | Feedback input | Regulated to 0.8V; sets output voltage via resistor divider; bias current ≤500nA minimizes divider error |
| PG (Pin 25) | Power Good open-drain output | Asserts high when VOUT > 92% of nominal; requires external pull-up ≥10kΩ to VDD |
| EN (Pin 26) | Enable input | CMOS-compatible; logic high enables converter, logic low reduces supply current to 5µA |
| VIN (Pin 27) | Analog supply input | Powers internal control circuitry; bypass with 1.0µF ceramic cap to SGND |
| VDD (Pin 28) | 5V internal LDO output | Supplies control logic; regulated from VIN; tie to PVIN if VIN < 5.5V; requires 1.0µF cap to SGND |
Key Features
| Feature | Design Value |
|---|---|
| Hyper Light Load™ architecture | Enables 80% efficiency at 10mA by auto-switching to variable-frequency DCM, eliminating need for external bias rails |
| Any Capacitor™ stability | Stable with zero-to-high ESR output capacitors (e.g., ceramic, polymer, electrolytic), simplifying BOM and layout |
| Integrated power MOSFETs | 27 mΩ high-side + 10.5 mΩ low-side RDS(ON) reduce conduction loss and eliminate external FET selection |
| Power Good (PG) output | Open-drain signal with 92% threshold and 100µs delay ensures reliable sequencing in multi-rail systems |
| Safe pre-biased startup | Prevents reverse current flow into output during enable, protecting downstream loads and capacitors |
Applications
| Telecom Line Cards | Graphics Card Core Rails |
|---|---|
Use Scenario: Regulating 12V or 24V backplane supply to 1.0V–1.8V for ASIC/FPGA cores in carrier-grade switches. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing dynamic load steps up to 9A with sub-100µs recovery. Use Value: Hyper Speed Control™ enables high delta-V operation (28V→0.8V) and fast transient response without external compensation. |
Use Scenario: Providing GPU core voltage (e.g., 0.9V–1.2V) in discrete video cards with bursty 5–9A load profiles. IC Role / Device Role / Timing Role: High-current DC/DC regulator with integrated MOSFETs and thermal derating support up to +125°C ambient. Use Value: 5mm × 6mm MLF® package delivers 9A capability in compact area; exposed thermal pad enables direct PCB heatsinking. |
| Network Processor Boards | Industrial PLC I/O Modules |
Use Scenario: Generating 3.3V or 5.0V from 12V intermediate bus for multi-core network processors with deep sleep states. IC Role / Device Role / Timing Role: Adaptive on-time buck regulator transitioning seamlessly between CCM and DCM to maintain >80% efficiency at 10mA idle current. Use Value: 450µA quiescent current in DCM extends system standby time; ±1% FB accuracy ensures tight voltage margining. |
Use Scenario: Powering isolated I/O channel regulators in programmable logic controllers operating in −40°C to +85°C industrial enclosures. IC Role / Device Role / Timing Role: Robust buck converter with undervoltage lockout, thermal shutdown, and hiccup-mode short-circuit protection. Use Value: −40°C to +125°C junction rating and 28°C/W thermal resistance ensure reliability under sustained full-load conditions. |
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 max output, 2MHz switching, no integrated bootstrap diode requirement; smaller 8-pin SOIC package | Suitable for lower-current, space-constrained designs where 9A capability is unnecessary | Select MP2451DT-LF-Z only when output current ≤3A and higher frequency (2MHz) is preferred for smaller magnetics |
| TPS549D22RQFR | 9A output, 2.2MHz, PMBus interface, integrated MOSFETs, but requires external VDD bias and has narrower 4.5–18V input range | Targeted at digitally controlled, multi-phase systems needing telemetry and sequencing flexibility | Choose TPS549D22RQFR when digital monitoring, phase synchronization, or tighter input voltage constraints apply |
Compared with MP2451DT-LF-Z and TPS549D22RQFR, the MIC26903YJL-TR uniquely combines 9A capability, 4.5–28V input, Hyper Light Load™ DCM efficiency, and MLF® thermal performance without requiring external bias or digital infrastructure-making it optimal for analog-controlled, high-reliability 28V-input power stages.
Availability
MIC26903YJL-TR is available at Aetrix Electronics and suitable for telecom infrastructure, graphics processing units, and industrial PLCs requiring stable component supply across extended temperature and high-current operational profiles.
Supply support for MIC26903YJL-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 fabless semiconductor company specializing in power management, timing, and interface ICs before its acquisition by Microchip Technology in 2015. Its legacy products remain widely deployed in industrial and communications equipment.
The MIC26903YJL-TR belongs to Micrel's SuperSwitcher II™ family of high-efficiency synchronous buck regulators, designed specifically for high-current, wide-input-voltage DC/DC conversion in space- and thermally constrained applications.
FAQ
What is the maximum output current capability of the MIC26903YJL-TR?
The MIC26903YJL-TR delivers up to 9A of continuous output current in continuous conduction mode at 25°C ambient with proper PCB thermal design. Derating applies above 25°C per the thermal derating curves in the datasheet-e.g., ~7A at 85°C ambient with 5-in² 4-layer board. Peak current limit is 12.5–20A depending on junction temperature.
Does the MIC26903YJL-TR require an external bootstrap diode?
Yes, the MIC26903YJL-TR requires an external Schottky diode connected from PVDD to BST (Pin 20) to charge the 0.1µF BST capacitor during low-side conduction. This is mandatory for high-side gate drive functionality; omission will prevent proper high-side MOSFET turn-on and cause converter failure.
Can the MIC26903YJL-TR operate with input voltage below 5.5V?
Yes, the MIC26903YJL-TR operates with input voltage as low as 4.5V. However, when VIN < 5.5V, both VDD (Pin 28) and PVDD (Pin 1) must be tied directly to PVIN pins to bypass the internal 5V LDOs, as specified in the Pin Description section. Failure to do so results in insufficient gate drive and control circuit power.
How does the MIC26903YJL-TR achieve high light-load efficiency?
The MIC26903YJL-TR achieves up to 80% efficiency at 10mA by automatically entering discontinuous conduction mode (DCM) via its zero-cross comparator. In DCM, non-essential circuits power down, reducing quiescent current to 450 µA while maintaining regulation-enabled by Hyper Light Load™ architecture without external circuitry.
What is the purpose of the CS (current sense) pin on the MIC26903YJL-TR?
The CS (Pin 22) on the MIC26903YJL-TR senses current by monitoring the voltage drop across the internal low-side MOSFET's RDS(ON) during OFF-time. It enables foldback current limiting and hiccup-mode short-circuit protection without an external sense resistor-reducing cost, board area, and power loss while improving accuracy via Kelvin connection.
MIC26903YJL-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- HyperLight Load®, SuperSwitcher IIG™
- 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)
MIC26903YJL-TR FAQ
1.How can I place an order for MIC26903YJL-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC26903YJL-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 MIC26903YJL-TR reliable?
The price and inventory of MIC26903YJL-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC26903YJL-TR is usually 5 days.
3.What payment methods are accepted for MIC26903YJL-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC26903YJL-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC26903YJL-TR?
MIC26903YJL-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC26903YJL-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 MIC26903YJL-TR?
For technical support, including MIC26903YJL-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC26903YJL-TR requirements.
6.How does Aetrix verify that MIC26903YJL-TR is sourced from the original manufacturer or authorized distributors?
All MIC26903YJL-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 MIC26903YJL-TR meets industry standards.
7.What is the process for return or replacement of MIC26903YJL-TR?
All MIC26903YJL-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC26903YJL-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 MIC26903YJL-TR part is unused and in its original packaging.
Return procedure for MIC26903YJL-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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