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Microchip Technology MIC261203YJL-TR
- Part No.:
- MIC261203YJL-TR
- Manufacturer:
- Microchip Technology
- Package:
- 28-PowerVQFN
- Datasheet:
-
MIC261203YJL-TR.pdf
- Description:
- IC REG BUCK ADJ 12A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,771
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Product details
Overview
MIC261203YJL-TR from Micrel is a synchronous DC/DC buck regulator with adaptive on-time control, operating from 4.5V to 28V input and delivering up to 12A output current at adjustable voltages down to 0.8V. It integrates dual internal MOSFETs (13mΩ high-side, 5.3mΩ low-side), features Hyper Light Load™ architecture for 80% efficiency at 10mA, and includes Power Good (PG) output and foldback short-circuit protection. It is used in telecom power supplies requiring high transient response and light-load efficiency.
For engineers reviewing the MIC261203YJL-TR datasheet, MIC261203YJL-TR pinout, MIC261203YJL-TR application, or MIC261203YJL-TR equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications across –40°C to +125°C, and real-world alternative selection guidance for distributed power systems.
Technical Context
The MIC261203YJL-TR uses adaptive on-time control to maintain ~600kHz switching frequency in continuous conduction mode while transitioning to variable-frequency discontinuous mode under light loads. Its zero-cross comparator monitors low-side MOSFET voltage during OFF-time to detect inductor current zero crossing and enable Hyper Light Load™ operation.
It implements current limiting without external sense resistors by measuring voltage drop across the internal 5.3mΩ low-side MOSFET, with foldback threshold varying from 18.75A to 33A depending on feedback voltage. The integrated 5V LDO powers internal circuitry from VIN and supplies gate drive via PVDD and BST pins using a bootstrap capacitor.
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 rails |
| Output Current | Up to 12A - sufficient for FPGA core rails and ASIC power domains |
| Switching Frequency | 600kHz ±150kHz - enables compact magnetics and predictable EMI filtering |
| Feedback Reference | 0.8V ±1% - allows precise regulation of sub-1V outputs with standard resistor dividers |
| Efficiency @ 10mA | 80% - maintains high light-load efficiency without external bias circuits |
| Junction Temp Range | –40°C to +125°C - qualified for extended-temperature industrial and networking environments |
| Package | 28-pin 5mm × 6mm MLF® - thermally enhanced exposed-pad QFN for high-power density |
Pinout & Package
Package: 28-pin 5mm × 6mm MLF® (MicroLeadFrame) with exposed thermal pad - optimized for PCB heat spreading and high-current routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVDD (Pin 1) | Internal LDO output for gate drive | Supplies high-side driver; requires 2.2µF ceramic cap to PGND; tied 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 capacitors, and power stage - must be separated from SGND |
| PVIN (Pins 13–19) | Main input voltage supply | 4.5V–26V input rail; multiple pins reduce resistance and inductance for 12A operation |
| BST (Pin 20) | Bootstrap supply | Drives high-side gate via 0.1µF capacitor to SW; Schottky diode required between PVDD and BST |
| CS (Pin 22) | Current sense input | Monitors low-side MOSFET VDS during OFF-time for overcurrent protection - requires Kelvin connection |
| SGND (Pin 23) | Signal ground reference | Reference for FB, EN, PG; 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 ensures accuracy |
| 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 input | CMOS-compatible; logic high enables, low shuts down (IQ = 5µA); must not float |
| VIN (Pin 27) | Control circuit supply input | Bypassed to SGND with 1.0µF ceramic cap; powers internal logic and LDO control circuitry |
| VDD (Pin 28) | 5V internal LDO output | Supplies control logic; regulated from VIN; tied to PVIN if VIN < 5.5V; requires 1.0µF cap to SGND |
Key Features
| Feature | Design Value |
|---|---|
| Hyper Light Load™ architecture | Maintains 80% efficiency at 10mA by entering discontinuous mode and reducing bias currents - eliminates need for external LDO bias |
| Any Capacitor™ stability | Stable with zero-to-high ESR output capacitors - removes requirement for specific low-ESR tantalum or polymer types |
| Integrated MOSFETs | 13mΩ high-side and 5.3mΩ low-side N-channel MOSFETs - eliminate external FETs and gate drivers for compact 12A solutions |
| Adaptive on-time control | Enables fast transient response without loop compensation components - reduces design cycle time for point-of-load applications |
| Safe start-up into pre-biased loads | Prevents reverse current flow during hot-plug events - protects downstream circuitry in modular power systems |
Applications
| Telecom Line Cards | Network Switch ASIC Core Rails |
|---|---|
Use Scenario: Powering multi-core processors and SerDes transceivers on carrier-grade line cards with strict thermal and efficiency requirements. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 1.0V/12A to FPGA fabric with fast load-step response. Use Value: Hyper Light Load™ sustains >75% efficiency at standby current (≤50mA), reducing system cooling needs and energy cost. |
Use Scenario: Generating core voltage for 10G/25G switch ASICs in data center top-of-rack switches where board space is constrained. IC Role / Device Role / Timing Role: High-current, low-noise DC/DC converter with 0.8V output and ±1% regulation accuracy. Use Value: Integrated 5.3mΩ low-side MOSFET and 600kHz switching minimize output ripple and simplify filter design for jitter-sensitive SerDes. |
| Industrial PLC CPU Modules | High-Performance Graphics Cards |
Use Scenario: Providing reliable 1.2V/8A supply to ARM-based PLC controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Robust buck regulator with thermal shutdown, hiccup-mode short-circuit protection, and –40°C to +125°C qualification. Use Value: 28-pin MLF package with exposed thermal pad ensures stable operation under sustained 85°C ambient without derating. |
Use Scenario: Delivering dynamic GPU core voltage (0.8–1.3V) in gaming graphics cards with rapid load transients. IC Role / Device Role / Timing Role: Adaptive on-time buck controller enabling sub-10µs recovery from 0→12A load steps. Use Value: Zero-cross comparator and internal current sensing eliminate external components while maintaining ±1% output accuracy across temperature. |
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 low-side MOSFET - requires external sync rectifier | Suitable for lower-current auxiliary rails; lacks Hyper Light Load™ and PG output | Select when board space permits discrete layout and 12A is not required |
| TPS54620RGYR | 6A max output, 2.2MHz, D-CAP2 control, integrated 12mΩ/7mΩ FETs - narrower 4.5–17V input range | Optimized for 12V input systems; no discontinuous mode light-load optimization | Choose for higher-frequency designs needing smaller inductors but accepting reduced light-load efficiency |
Compared with MP2451DT-LF-Z and TPS54620RGYR, the MIC261203YJL-TR uniquely delivers 12A output with integrated dual FETs, 600kHz fixed-frequency operation, and verified 80% efficiency at 10mA - making it the only option among the three qualified for high-current, wide-input, and ultra-light-load telecom power applications.
Availability
MIC261203YJL-TR is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and high-performance graphics cards requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MIC261203YJL-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., now part of Microchip Technology, specialized in high-performance analog and power ICs for communications, computing, and industrial markets before its 2015 acquisition.
The MIC261203YJL-TR belongs to Micrel's SuperSwitcher II family, designed specifically for high-current, wide-input-voltage DC/DC conversion in space-constrained telecom and networking equipment.
FAQ
What is the maximum output current capability of the MIC261203YJL-TR under continuous operation?
The MIC261203YJL-TR delivers up to 12A of continuous output current when mounted on a 5-square-inch 4-layer PCB with 2oz copper and operated within its thermal limits. Derating applies above 70°C ambient; full 12A is guaranteed at TA ≤ 50°C with proper heatsinking. The device includes foldback current limiting that activates at 18.75A–33A depending on feedback voltage, protecting against overload conditions without external components.
Does the MIC261203YJL-TR require an external current-sense resistor?
No, the MIC261203YJL-TR does not require an external current-sense resistor. It uses the RDS(ON) of its internal 5.3mΩ low-side MOSFET to sense inductor current during the OFF-time, enabling accurate overcurrent protection and hiccup-mode short-circuit response. This eliminates board space, cost, and power loss associated with discrete sense resistors while maintaining ±1% current limit accuracy across temperature.
How does the MIC261203YJL-TR achieve high efficiency at light loads?
The MIC261203YJL-TR achieves up to 80% efficiency at 10mA through its Hyper Light Load™ architecture, which transitions from fixed-frequency continuous conduction mode to variable-frequency discontinuous mode under light loads. During discontinuous mode, non-essential circuits are powered down, reducing quiescent current to ~450µA. The zero-cross comparator detects inductor current zero crossing to trigger wake-up, ensuring fast transient response without sacrificing light-load efficiency.
What is the purpose of the BST and PVDD pins on the MIC261203YJL-TR?
The BST pin provides bootstrapped gate drive voltage for the internal high-side N-channel MOSFET, using a 0.1µF capacitor connected between BST and SW. The PVDD pin supplies the gate drive circuitry from an internal 5V LDO fed by VIN; it must be decoupled with a 2.2µF ceramic capacitor to PGND. When VIN < 5.5V, PVDD must be externally tied to PVIN to ensure adequate gate drive voltage - both pins are critical for reliable high-side switching and 12A output capability.
Can the MIC261203YJL-TR safely start up into a pre-biased output voltage?
Yes, the MIC261203YJL-TR supports safe start-up into pre-biased outputs. Its control architecture prevents reverse current flow by disabling the low-side MOSFET until the internal reference ramps up during soft-start. This feature protects downstream circuitry in hot-swap and modular power systems where the output capacitor may retain residual voltage before the regulator is enabled. The 5ms internal digital soft-start sequence ensures controlled voltage ramp without inrush current spikes.
MIC261203YJL-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:
- 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)
MIC261203YJL-TR FAQ
1.How can I place an order for MIC261203YJL-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC261203YJL-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 MIC261203YJL-TR reliable?
The price and inventory of MIC261203YJL-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC261203YJL-TR is usually 5 days.
3.What payment methods are accepted for MIC261203YJL-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC261203YJL-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC261203YJL-TR?
MIC261203YJL-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC261203YJL-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 MIC261203YJL-TR?
For technical support, including MIC261203YJL-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC261203YJL-TR requirements.
6.How does Aetrix verify that MIC261203YJL-TR is sourced from the original manufacturer or authorized distributors?
All MIC261203YJL-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 MIC261203YJL-TR meets industry standards.
7.What is the process for return or replacement of MIC261203YJL-TR?
All MIC261203YJL-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC261203YJL-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 MIC261203YJL-TR part is unused and in its original packaging.
Return procedure for MIC261203YJL-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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