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Microchip Technology MIC26400YJL-TR
- Part No.:
- MIC26400YJL-TR
- Manufacturer:
- Microchip Technology
- Package:
- 28-PowerVQFN
- Datasheet:
-
MIC26400YJL-TR.pdf
- Description:
- IC REG BUCK ADJ 5A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:998
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Product details
Overview
MIC26400YJL-TR from Micrel is a synchronous step-down DC/DC buck regulator with Hyper Speed Control™ architecture, delivering up to 5A output current across 4.5V–26V input range and adjustable 0.8V–5.5V output (±1% accuracy at 25°C). It operates at fixed 300kHz switching frequency, features internal MOSFETs (RDS(ON) = 43mΩ/12.5mΩ), and targets high-delta-V applications such as telecom power supplies and embedded computing rails.
For engineers reviewing the MIC26400YJL-TR datasheet, MIC26400YJL-TR pinout, MIC26400YJL-TR application, or MIC26400YJL-TR equivalent, this page provides verified functional context, validated pin roles, confirmed thermal and protection behavior, and real-world design constraints including 6ms soft-start, hiccup-mode short-circuit response, and Any Capacitor™ stability support for ceramic, tantalum, and OS-CON outputs.
Technical Context
The MIC26400YJL-TR implements a digitally modified adaptive ON-time control scheme that maintains ~300kHz nominal switching frequency while enabling ultra-fast transient response via valley-based feedback ripple sensing. Its control loop uses a 0.8V reference and transconductance amplifier to trigger ON-time periods without external slope compensation.
Current limiting is achieved by monitoring the voltage drop across the internal low-side MOSFET during OFF-time, eliminating need for external sense resistors. Protection includes foldback current limit (6–13A range), thermal shutdown at 155°C with 10°C hysteresis, undervoltage lockout (2.7V typical), and safe startup into pre-biased loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 26V - supports wide industrial and telecom input rails without external regulators. |
| Output Voltage Range | 0.8V to 5.5V (±1% at 25°C) - enables precise core voltage regulation for FPGAs, ASICs, and microprocessors. |
| Max Output Current | 5A continuous - sufficient for single-rail CPU/GPU core supplies in networking and embedded systems. |
| Switching Frequency | 300kHz (225–375kHz range) - balances EMI, inductor size, and efficiency for mid-power applications. |
| Internal MOSFET RDS(ON) | High-side: 43mΩ, Low-side: 12.5mΩ - enables >95% peak efficiency at 12VIN/1.2VOUT, 3A load. |
| Soft-Start Time | 6ms - limits inrush current during power-up, reducing stress on input capacitors and upstream converters. |
| Junction Temp Range | −40°C to +125°C - qualified for extended-temperature industrial and automotive under-hood environments. |
| Package | 28-pin 5mm × 6mm MLF® - thermally enhanced exposed-pad QFN for efficient heat dissipation in compact layouts. |
Pinout & Package
28-pin 5mm × 6mm MLF® (MicroLeadFrame) package with exposed thermal pad; RoHS-compliant, Pb-free finish. Designed for high-current power delivery with separate signal (SGND) and power ground (PGND) paths to minimize noise coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 13–19) | High-side MOSFET drain connection | Primary input power path (4.5–26V); requires low-inductance decoupling to PGND near pins. |
| PGND (Pins 2,5–8,21) | Power ground return | Low-impedance return for internal MOSFETs and input/output capacitors; must be routed separately from SGND. |
| SW (Pins 4,9–12) | Switch node | Connection point between internal high-side source and low-side drain; critical for layout-minimize loop area. |
| BST (Pin 20) | Bootstrap supply | Drives high-side gate via 0.1μF capacitor to SW; requires Schottky diode from VDD to BST. |
| FB (Pin 25) | Feedback input | Senses output via resistor divider; regulated to 0.8V reference; ripple ≥20mV required for stable operation. |
| EN (Pin 24) | Enable control | CMOS-compatible logic input (high/float = on, low = shutdown); draws only 0.7mA in shutdown. |
| VDD (Pin 27) | Bias supply | Internal circuitry power (4.5–5.5V); requires 2.2μF ceramic cap to PGND placed adjacent to IC. |
| CS (Pin 22) | Current sense | Monitors low-side MOSFET voltage during OFF-time for overcurrent detection-no external resistor needed. |
| SGND (Pin 26) | Signal ground | Analog reference for FB, EN, and control circuits; must connect directly to ground plane-not to PGND pad. |
| VIN (Pin 23) | Secondary bias input | Supplies auxiliary circuitry; bypass capacitor to SGND required. |
| NC (Pins 1,3,28) | No connect | Not internally bonded; leave unconnected and unpopulated on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Hyper Speed Control™ architecture | Enables fast load transient recovery (<10µs) and reduces required output capacitance by up to 50% vs. conventional buck controllers. |
| Any Capacitor™ stability | Operates stably with zero-ESR ceramic, medium-ESR tantalum, and high-ESR aluminum electrolytic outputs-no external compensation needed. |
| Integrated MOSFETs with low RDS(ON) | Eliminates external power switches and gate drivers; reduces BOM count and layout complexity for 5A solutions. |
| Hiccup-mode short-circuit protection | Shuts down and auto-retries after fault clearance-prevents thermal runaway during sustained shorts without manual reset. |
| Pre-biased output startup | Allows safe turn-on when output rail is already energized (e.g., hot-swap or multi-rail sequencing), avoiding reverse current flow. |
| Internal soft-start with 6ms ramp | Gradually increases reference voltage in 9.7mV steps-controls slew rate of output voltage to limit inrush into bulk capacitance. |
Applications
| Telecom Power Supply | Network Router Core Rail |
|---|---|
Use Scenario: Generating 1.2V/3.5A for FPGA fabric in carrier-grade edge routers operating from 12V intermediate bus. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated core voltage with fast transient response to logic switching events. Use Value: Hyper Speed Control™ ensures <50mV output deviation during 2A step load changes, maintaining FPGA timing margins without oversized output caps. |
Use Scenario: Delivering 3.3V/4A to packet processing ASICs in 1U rack-mounted network gateways with 24V input. IC Role / Device Role / Timing Role: High-efficiency buck converter managing dynamic power demand of multi-core network processors. Use Value: 95% peak efficiency at full load reduces thermal load in space-constrained chassis; Any Capacitor™ allows use of low-profile ceramic arrays. |
| Industrial PLC I/O Module | Set-Top Box SoC Power |
Use Scenario: Providing 5.0V/2.5A to isolated I/O interface circuits in factory automation controllers with −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Robust DC/DC regulator handling wide input variation and ESD-prone field wiring conditions. Use Value: −40°C to +125°C junction rating and integrated UVLO/thermal shutdown ensure reliable operation in uncontrolled industrial enclosures. |
Use Scenario: Regulating 1.1V/4.2A for ARM-based media processor in consumer set-top boxes powered from 12V wall adapter. IC Role / Device Role / Timing Role: Main SoC core supply with tight voltage tolerance and low-noise performance for video decoding pipelines. Use Value: ±1% output accuracy and 6ms soft-start prevent brownout resets during cold start; MLF package enables compact 4-layer PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z (Monolithic Power) | 4.5–30V input, 3A max, 500kHz switching, no internal BST diode requirement | Limited to 3A output; lacks hiccup-mode protection and pre-biased startup | Choose for higher-frequency designs where smaller inductors are prioritized over current capability and robust fault handling. |
| TPS54560BQDDARQ1 (TI) | 3.5–60V input, 5A, 100–2500kHz adjustable freq, external compensation | Requires external loop compensation and current-sense resistor; wider VIN but lower efficiency at 12VIN/1.2VOUT | Prefer when input voltage exceeds 26V or programmable frequency/EMI shaping is required-accept added design complexity. |
Compared with MP2315DJ-LF-Z and TPS54560BQDDARQ1, the MIC26400YJL-TR delivers higher current in a simpler, fully integrated solution with superior transient response and built-in fault resilience-ideal for space-constrained, high-reliability 5A applications where input stays ≤26V.
Availability
MIC26400YJL-TR is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and consumer electronics requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for MIC26400YJL-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 analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015. Known for innovation in DC/DC regulation and SuperSwitcher™ architectures.
The MIC26400YJL-TR belongs to Micrel's SuperSwitcher II™ family, designed specifically for high-efficiency, high-transient-response synchronous buck conversion in distributed power systems where simplicity, reliability, and wide input range are critical.
FAQ
What is the recommended output capacitor type for MIC26400YJL-TR?
The MIC26400YJL-TR supports Any Capacitor™ operation, meaning it remains stable with ceramic, tantalum, OS-CON, and low-ESR aluminum electrolytic capacitors. For best transient performance and minimal footprint, 22–47µF X5R/X7R ceramics with ≤10mΩ ESR are recommended. If using low-ESR types, ensure ≥20mV peak-to-peak ripple at the FB pin via intentional ripple injection per the datasheet guidelines.
Does MIC26400YJL-TR support startup into a pre-biased output?
Yes, MIC26400YJL-TR supports safe startup into a pre-biased output rail. Its control architecture prevents reverse current flow during turn-on by disabling the low-side MOSFET until the internal reference ramps above the existing output voltage. This feature is essential for hot-swap and multi-rail sequencing applications where output voltage may already be present.
What is the minimum off-time specification for MIC26400YJL-TR and why does it matter?
The MIC26400YJL-TR has a fixed minimum off-time (tOFF(min)) of 360ns. This parameter ensures sufficient time to recharge the BST capacitor and maintain high-side gate drive integrity. Operating near this limit-especially in high-VIN/low-VOUT conditions-can reduce effective switching frequency and impact line regulation; therefore, designs should avoid steady-state operation where calculated off-time approaches 360ns.
How does MIC26400YJL-TR implement current limiting without an external sense resistor?
MIC26400YJL-TR senses current by measuring the voltage drop across the internal low-side MOSFET's RDS(ON) during its conduction phase (OFF-time of the high-side switch). This eliminates external components while providing accurate foldback current limiting (6–13A range) and hiccup-mode short-circuit protection-reducing BOM cost and board area without sacrificing protection fidelity.
Can MIC26400YJL-TR operate with input voltage below 4.5V?
No-MIC26400YJL-TR has a specified absolute minimum input voltage of 4.5V for both PVIN and VIN pins. Operation below this threshold violates Absolute Maximum Ratings and may result in improper UVLO behavior, unstable regulation, or failure to initiate soft-start. For sub-4.5V applications, consider alternative regulators such as Micrel's MIC2295 or compatible low-input buck devices.
MIC26400YJL-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:
- 5A
- 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)
MIC26400YJL-TR FAQ
1.How can I place an order for MIC26400YJL-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC26400YJL-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 MIC26400YJL-TR reliable?
The price and inventory of MIC26400YJL-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC26400YJL-TR is usually 5 days.
3.What payment methods are accepted for MIC26400YJL-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC26400YJL-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC26400YJL-TR?
MIC26400YJL-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC26400YJL-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 MIC26400YJL-TR?
For technical support, including MIC26400YJL-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC26400YJL-TR requirements.
6.How does Aetrix verify that MIC26400YJL-TR is sourced from the original manufacturer or authorized distributors?
All MIC26400YJL-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 MIC26400YJL-TR meets industry standards.
7.What is the process for return or replacement of MIC26400YJL-TR?
All MIC26400YJL-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC26400YJL-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 MIC26400YJL-TR part is unused and in its original packaging.
Return procedure for MIC26400YJL-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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