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Microchip Technology MIC22400YML-TR
- Part No.:
- MIC22400YML-TR
- Manufacturer:
- Microchip Technology
- Package:
- 20-VFQFN Exposed Pad, 20-MLF®
- Datasheet:
-
MIC22400YML-TR.pdf
- Description:
- IC REG BUCK ADJ 4A 20MLF
- Quantity:
- Payment:
- Shipping:
Inventory:1,728
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Product details
Overview
MIC22400YML-TR from Microchip Technology is a 4A synchronous buck regulator IC with integrated high-side P-channel (60 mΩ) and low-side N-channel (35 mΩ) MOSFETs, adjustable output down to 0.7V, programmable switching frequency from 300 kHz to 4 MHz, and full sequencing/tracking capability via EN/DLY, DELAY, and RC pins. It delivers >90% efficiency at 1 MHz across 0.5–4 A loads and operates from –40°C to +125°C junction temperature in server point-of-load and FPGA core power applications.
For engineers reviewing the MIC22400YML-TR datasheet, MIC22400YML-TR pinout, MIC22400YML-TR application, or MIC22400YML-TR equivalent, this page provides verified technical context on voltage-mode PWM control, thermal shutdown, 100% duty cycle operation, ramp-controlled soft-start, and QFN-20 package layout compatibility - all critical for high-density DC/DC design validation.
Technical Context
The MIC22400YML-TR implements voltage-mode PWM control with an internal 1 MHz ramp generator and error amplifier comparing FB voltage against a precision 0.7 V reference (±1% over temperature). Its adaptive drive circuitry enables ultra-fast transient response by maintaining regulation under ±1 A/μs load steps typical of FPGAs and low-voltage ASICs.
Sequencing and tracking are implemented through three dedicated pins: EN/DLY (1 μA current source, 1.24 V enable threshold), DELAY (1 μA charge/discharge for POR timing), and RC (1 μA current source setting output slew rate). These allow precise turn-on/turn-off ordering and ΔV-matched startup across multiple MIC22400YML-TR units without external controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6 V to 5.5 V - supports single-supply operation from common 3.3 V or 5 V rails without LDO pre-regulation. |
| Output Current | Up to 4 A continuous - sufficient for powering FPGA cores, DSPs, and multi-core SoCs directly. |
| Output Voltage Range | Adjustable down to 0.7 V - enables compliance with modern sub-1 V logic supply requirements (e.g., 0.85 V, 0.9 V, 1.0 V, 1.2 V). |
| Switching Frequency | 300 kHz to 4 MHz - selectable via CF capacitor and optional RCF resistor; higher frequencies reduce inductor size, lower frequencies improve light-load efficiency. |
| Efficiency | >90% at 1 MHz, 1.2 V/4 A, VIN = 3.3 V - achieved via fully integrated 60 mΩ P-FET and 35 mΩ N-FET with optimized gate drive. |
| Junction Temperature | –40°C to +125°C - qualified for industrial and telecom base station environments with no derating up to 85°C ambient. |
| Protection Features | Thermal shutdown (150°C), current limit (4–10 A), undervoltage lockout (2.5 V ±280 mV), and micropower shutdown (<10 μA). |
Pinout & Package
Package: 20-pin 3 mm × 4 mm QFN (ML) with exposed thermal pad (EP); RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 10, 17) | Power input supply | Connects to high-current input rail; requires local 22 μF X5R/X7R ceramic bypass per pin to minimize high-frequency noise. |
| SVIN (Pin 8) | Signal input supply | Provides bias for internal control circuitry; must be decoupled separately from PVIN to avoid coupling noise into feedback path. |
| SW (Pins 12, 13, 14, 15) | Switch node output | Drain connection of internal P-FET and N-FET; high di/dt node requiring short, wide PCB traces and minimized loop area to reduce EMI. |
| FB (Pin 6) | Feedback input | Senses output voltage via resistor divider; referenced to 0.7 V internal bandgap; impedance <10 kΩ recommended to limit noise susceptibility. |
| COMP (Pin 4) | Compensation network | External RC network (e.g., 20 kΩ + 15 pF) sets dominant pole-zero pair for stable voltage-mode loop with 100–200 kHz bandwidth. |
| EN/DLY (Pin 18) | Enable & startup delay | 1 μA current source charges external capacitor; device starts when voltage exceeds 1.24 V - enables simple, accurate power sequencing. |
| RC (Pin 20) | Ramp control | 1 μA current source sets output voltage slew rate during startup; enables tracking between multiple regulators by connecting RC to master's VOUT. |
| POR (Pin 1) | Power-On-Reset output | Open-drain signal asserted high after VOUT reaches 90% of target and DELAY timeout expires; used for system reset coordination. |
| DELAY (Pin 19) | POR timing control | 1 μA current source charges external capacitor; POR assertion delayed until DELAY pin reaches 1.24 V - allows staggered supply ramp-down. |
| PGND (Pins 11, 16) | Power ground return | Low-impedance return path for high-current N-FET source; must be connected directly to thermal pad and separated from SGND plane. |
| SGND (Pin 7) | Signal ground reference | Reference for FB, COMP, EN/DLY, RC, DELAY, and POR; routed separately from PGND to prevent noise coupling into control loop. |
| CF (Pin 2) | Frequency programming | Capacitor-to-PGND sets switching frequency (e.g., 390 pF → 1.05 MHz); adding RCF resistor extends range down to 300 kHz. |
| NC (Pins 3, 5, 9) | No connect | Internally unconnected; must remain floating or tied to PGND per layout guidelines - not usable as additional grounds or signals. |
| EP | Exposed thermal pad | Must be soldered to solid GND plane for thermal dissipation; contributes significantly to θJA = 45°C/W (QFN) and improves reliability at full 4 A load. |
Key Features
| Feature | Design Value |
|---|---|
| Fully integrated power stage | Eliminates external MOSFETs and drivers - reduces BOM count, layout area, and gate-drive loop inductance for improved EMI performance. |
| Programmable soft-start via RC pin | Enables controlled output voltage ramp-up (e.g., 10 ms to 1.2 V) to prevent inrush current and ensure clean power-up of downstream logic. |
| Tracking and sequencing support | Allows two or more MIC22400YML-TR units to start up with matched dV/dt or in defined order (e.g., core before I/O) using only passive components. |
| Ultra-fast transient response | Maintains ±30 mV regulation window under 0.1–4 A load steps at 1 A/μs - critical for FPGA dynamic voltage scaling and burst-mode processing. |
| Voltage-mode PWM architecture | Delivers fixed-frequency operation (no frequency jitter), predictable EMI spectrum, and stable loop behavior across input/output variations without mode switching. |
| Micropower shutdown | Reduces quiescent current to <10 μA - preserves battery life in always-on systems and enables low-power standby modes in embedded controllers. |
Applications
| Server Point-of-Load Conversion | FPGA Core Power Supply |
|---|---|
|
Use Scenario: Delivering tightly regulated 0.85 V @ 3.5 A to Xilinx Kintex-7 FPGA core rails in 1U rack-mounted servers with strict thermal envelope limits. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing dynamic voltage scaling (DVS) support and fast transient response to handle logic state transitions. Use Value: Integrated 60 mΩ/35 mΩ MOSFETs and 100% duty cycle capability enable direct 3.3 V input-to-0.85 V conversion with >91% efficiency at full load, reducing heatsink requirements. |
Use Scenario: Powering Altera Stratix V transceiver banks requiring 1.1 V with ±1% accuracy and <50 mV undershoot during 2 A load steps. IC Role / Device Role / Timing Role: Secondary buck regulator synchronized to main core supply via RC pin for voltage tracking during power-up and brownout recovery. Use Value: RC-controlled slew rate ensures transceiver VCCIO ramps within 100 ms of core VCC, preventing configuration errors and meeting Intel/Altera power sequencing specs. |
| Telecom Base Station RF Front-End | Industrial Embedded Controller |
|
Use Scenario: Generating 1.8 V @ 2.2 A for ADI AD9371 RF transceiver in LTE small cell equipment operating continuously at 70°C ambient. IC Role / Device Role / Timing Role: High-reliability DC/DC converter with thermal shutdown and current limiting protecting sensitive RF circuitry from overtemperature or short-circuit faults. Use Value: –40°C to +125°C junction rating and 45°C/W θJA (QFN) allow full 4 A operation without derating in sealed enclosures, eliminating need for forced air cooling. |
Use Scenario: Providing 3.3 V @ 1.5 A to ARM Cortex-A53-based industrial gateway with watchdog-triggered POR signaling to MCU upon power stabilization. IC Role / Device Role / Timing Role: System power supervisor generating open-drain POR signal after 10 ms delay (via DELAY capacitor) to coordinate firmware boot sequence. Use Value: POR output asserts only after VOUT reaches 90% of nominal and DELAY timeout completes - prevents premature MCU initialization and ensures deterministic boot. |
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 | 3 A rated, 4.5–24 V input, fixed 500 kHz frequency, no RC/DELAY/POR sequencing pins. | Lacks tracking, sequencing, and programmable soft-start - suitable only for standalone non-sequenced loads. | Select when cost and simplicity outweigh need for multi-rail coordination; verify thermal margin at 3.3 V input due to higher RDS(ON). |
| TPS544B20RTVT | 4 A, 4.5–18 V input, 300 kHz–2 MHz frequency, PMBus interface, no RC pin but supports tracking via VID. | Requires external EEPROM and PMBus host; offers telemetry but adds complexity and cost versus MIC22400YML-TR's analog-only solution. | Select when digital monitoring, margining, or remote fault logging is required; avoid if analog-only, low-pin-count design is mandatory. |
Compared with MP2315DJ-LF-Z and TPS544B20RTVT, the MIC22400YML-TR uniquely combines 4 A capability, 0.7 V minimum output, analog sequencing (RC/DELAY/EN/DLY), and QFN-20 thermal performance in a single chip - making it optimal for space-constrained, multi-rail FPGA and ASIC power systems where digital interfaces add unnecessary overhead.
Availability
MIC22400YML-TR is available at Aetrix Electronics and suitable for server point-of-load conversion, FPGA core power delivery, and telecom base station RF front-end applications requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for MIC22400YML-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
Microchip Technology Inc. is a leading provider of microcontrollers, analog devices, and power management ICs, with a focus on reliability, longevity, and industrial-grade qualification.
The MIC22400 family was designed specifically for high-density, high-efficiency point-of-load conversion in computing, networking, and communications infrastructure - emphasizing analog sequencing, thermal robustness, and seamless integration with FPGAs and low-voltage ASICs.
FAQ
What is the minimum output voltage supported by the MIC22400YML-TR?
The MIC22400YML-TR supports an adjustable output voltage down to 0.7 V, set by the FB pin's internal 0.7 V reference and external resistor divider. This enables direct powering of modern sub-1 V logic domains such as FPGA core supplies (e.g., 0.85 V) and advanced SoC rails. The reference tolerance is ±1% over temperature, ensuring tight regulation across –40°C to +125°C.
Does the MIC22400YML-TR require external MOSFETs?
No, the MIC22400YML-TR integrates both high-side P-channel (60 mΩ typical) and low-side N-channel (35 mΩ typical) MOSFETs, eliminating the need for external switches, drivers, or bootstrap components. This integration reduces total solution size, simplifies layout, and improves efficiency by minimizing gate-drive losses and parasitic inductance in the power loop.
How does the RC pin function in the MIC22400YML-TR?
The RC pin on the MIC22400YML-TR sources a precise 1 μA current to an external capacitor to program the output voltage slew rate during startup. This enables soft-start control and inter-device voltage tracking - for example, connecting the RC pin of a slave MIC22400YML-TR to the VOUT of a master unit ensures matched ramp profiles, satisfying FPGA I/O vs. core power sequencing requirements.
What package type is used for the MIC22400YML-TR?
The MIC22400YML-TR uses a 20-pin 3 mm × 4 mm QFN (ML) package with an exposed thermal pad (EP). This thermally enhanced package achieves a junction-to-ambient thermal resistance (θJA) of 45°C/W, supporting full 4 A operation in compact layouts without forced airflow - ideal for high-power-density applications like 1U servers and dense telecom modules.
Can the MIC22400YML-TR operate at 100% duty cycle?
Yes, the MIC22400YML-TR supports 100% maximum duty cycle operation, allowing it to maintain regulation even when input voltage approaches the output voltage (e.g., 3.3 V input to 3.0 V output). This feature is essential for dropout conditions in battery-powered or variable-input systems and eliminates the need for external LDO post-regulation in marginal input scenarios.
MIC22400YML-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad, 20-MLF®
- 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):
- 2.6V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.7V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 4A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-MLF® (3x4)
MIC22400YML-TR FAQ
1.How can I place an order for MIC22400YML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC22400YML-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 MIC22400YML-TR reliable?
The price and inventory of MIC22400YML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC22400YML-TR is usually 5 days.
3.What payment methods are accepted for MIC22400YML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC22400YML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC22400YML-TR?
MIC22400YML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC22400YML-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 MIC22400YML-TR?
For technical support, including MIC22400YML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC22400YML-TR requirements.
6.How does Aetrix verify that MIC22400YML-TR is sourced from the original manufacturer or authorized distributors?
All MIC22400YML-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 MIC22400YML-TR meets industry standards.
7.What is the process for return or replacement of MIC22400YML-TR?
All MIC22400YML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC22400YML-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 MIC22400YML-TR part is unused and in its original packaging.
Return procedure for MIC22400YML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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