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Microchip Technology MIC22205YML-TR
- Part No.:
- MIC22205YML-TR
- Manufacturer:
- Microchip Technology
- Package:
- 12-VFDFN Exposed Pad, 12-MLF®
- Datasheet:
-
MIC22205YML-TR.pdf
- Description:
- IC REG BUCK ADJ 2A 12MLF
- Quantity:
- Payment:
- Shipping:
Inventory:3,169
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Product details
Overview
MIC22205YML-TR from Micrel is a 2A, synchronous buck (step-down) DC-DC regulator IC with integrated high-side P-channel and low-side N-channel MOSFETs. It operates from 2.9V to 5.5V input, delivers adjustable output down to 0.7V, achieves >95% efficiency at 1MHz, and supports programmable switching frequency up to 4MHz. It is used in FPGA, DSP, and low-voltage ASIC power rails where fast transient response and pre-bias safe start-up are required.
For engineers reviewing the MIC22205YML-TR datasheet, MIC22205YML-TR pinout, MIC22205YML-TR application, or MIC22205YML-TR equivalent, key selection criteria include its 12-pin 3mm × 3mm MLF® package, ramp-controlled soft-start/tracking capability via RC pin, EN/DLY sequencing support, Power Good flag, and voltage-mode control architecture optimized for ceramic-capacitor-based point-of-load designs.
Technical Context
The MIC22205YML-TR implements voltage-mode PWM control with an internal fixed-frequency zero and pole for simplified external compensation. Its control loop uses a 1µA current source on the RC pin to enable precise output voltage ramping and inter-device tracking, and a separate 1µA source on EN/DLY to implement programmable turn-on delay.
It integrates fully matched MOSFETs (180mΩ high-side, 100mΩ low-side), supports 100% duty cycle in dropout, and features internal thermal shutdown (151°C trip) and overcurrent protection (5.5A typical limit). The device maintains regulation under extreme load transients common in FPGAs and low-voltage ASICs due to ultra-fast loop response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V–5.5V - supports single-cell Li-ion, USB, and 3.3V/5V rail inputs without external LDO pre-regulation. |
| Output Current | 2A continuous - sufficient for core power of mid-range FPGAs, DSPs, and SoCs. |
| Feedback Reference | 0.7V ±1.4% - enables precise output setting down to 0.7V using standard resistor dividers. |
| Switching Frequency | 300kHz–4MHz - programmable via CF capacitor; higher frequencies allow smaller inductors and faster transient response. |
| Efficiency | >95% at 1MHz, 5VIN/1.8VOUT, 1A - minimizes thermal load and extends battery life in portable applications. |
| Junction Temp Range | −40°C to +125°C - qualified for industrial and telecom infrastructure environments. |
| Protection Features | Thermal shutdown (151°C), overcurrent limit (5.5A typ), UVLO (2.72V rising), pre-bias safe start-up - ensures robust operation under fault and hot-plug conditions. |
Pinout & Package
The MIC22205YML-TR is housed in a 12-pin, 3mm × 3mm MLF® (MicroLeadFrame) package with exposed thermal pad (EP/GND). This RoHS-compliant, halogen-free package provides low θJA = 40°C/W and θJC = 28.7°C/W for efficient heat dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PG) | Open-drain Power Good flag | Asserts low when VOUT falls below 90% of target; used for system sequencing and fault monitoring. |
| 2 (RC) | Ramp Control input | 1µA current source sets output voltage slew rate during startup; enables tracking with other MIC22xxx/MIC68xxx devices. |
| 3 (CF) | Frequency programming node | Capacitor value determines switching frequency (e.g., 68pF → 4MHz); requires low-ESR ceramic placement adjacent to SGND. |
| 4 (SGND) | Signal ground reference | Low-noise return for feedback, compensation, and control circuitry; must be separated from PGND plane. |
| 5 (COMP) | Compensation network interface | Accepts RC network (e.g., 20kΩ + 15pF) to stabilize voltage-mode loop; simplifies design with internal pole-zero pair. |
| 6 (FB) | Feedback input | Regulated to 0.7V; connects to resistor divider from VOUT to set output voltage; sensitive to noise-requires local 50–100pF bypass. |
| 7 (SVIN) | Signal power supply | Bypassed with 2.2µF ceramic; powers internal logic and error amplifier; must connect externally to PVIN. |
| 8 (PVIN) | Main power input | Supplies internal MOSFETs; requires 10µF X5R/X7R ceramic per pin; shared with SVIN via short trace. |
| 9 (SW) | Switch node | High-frequency, high-current connection between internal MOSFET drains; demands short, wide PCB routing to minimize EMI and losses. |
| 10 (PGND) | Power ground | Return path for low-side MOSFET; must connect directly to EP/GND and high-current ground planes. |
| 11 (NC) | No-connect terminal | Must remain unconnected-no routing or grounding allowed. |
| 12 (EN/DLY) | Enable with delay function | 1µA current source charges external capacitor to delay startup; threshold = 1.24V; pulled low during UVLO. |
| EP (GND) | Exposed thermal pad | Must be soldered to solid GND plane for thermal performance and full 2A output capability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MOSFETs | 180mΩ P-ch high-side + 100mΩ N-ch low-side eliminate external switches and reduce BOM count and layout area. |
| Pre-bias safe start-up | Starts with low-side MOSFET disabled to prevent reverse inductor current and output overshoot when VOUT is already biased. |
| Full sequencing & tracking | RC and EN/DLY pins enable precise voltage ramp alignment and multi-rail power-up/down order without external controllers. |
| Voltage-mode control | Stable with ceramic output capacitors (22–470µF); supports fast transient response (100–200kHz gain bandwidth) and predictable EMI spectrum. |
| Ultra-fast transient response | Maintains output regulation within ±2% during 1A step loads (typical), critical for FPGA core voltage stability during burst-mode operation. |
Applications
| FPGA Core Power Supply | DSP/ASIC Point-of-Load Conversion |
|---|---|
Use Scenario: Powers 1.0V–1.8V core rails of Xilinx Spartan or Intel Cyclone FPGAs during dynamic reconfiguration and high-clock bursts. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated, low-noise DC output with <100ns response to load steps. Use Value: Pre-bias safe start-up prevents damage during hot-swap; PG signal synchronizes configuration loading; RC tracking aligns with I/O bank supplies. | Use Scenario: Supplies 1.2V/1.5V domains in TI C6000 DSPs or custom ASICs in base station line cards and optical modules. IC Role / Device Role / Timing Role: High-efficiency, low-ripple POL converter operating at 2–3MHz to shrink filter components and avoid AM band interference. Use Value: >95% efficiency reduces board-level heat; 125°C junction rating supports convection-cooled telecom enclosures; EN/DLY enables staggered rail bring-up. |
| Server DDR Memory Termination | Blu-ray Player SoC Power |
Use Scenario: Generates 0.75V VTT termination voltage for DDR3/DDR4 memory interfaces in rack-mounted servers and storage controllers. IC Role / Device Role / Timing Role: Precision-adjustable buck regulator tracking VDDQ with ±1% accuracy and sub-10mV ripple. Use Value: RC pin enables ratio-metric tracking to VDDQ; FB reference tolerance (±1.4%) ensures JEDEC-compliant VTT stability across temperature. | Use Scenario: Powers 1.0V core and 1.2V I/O rails of Broadcom or MediaTek SoCs in consumer Blu-ray players and streaming media boxes. IC Role / Device Role / Timing Role: Compact, low-cost DC-DC solution replacing discrete buck controllers and external MOSFETs in space-constrained consumer PCBs. Use Value: 3mm × 3mm MLF® package fits tight layouts; 4MHz max frequency allows 0.47µH inductor; Pb-free RoHS compliance meets global regulatory requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54227PWR | 3A rated, 4.5–18V input, 500kHz–2.5MHz programmable frequency, no RC tracking pin | Higher input range suits 12V intermediate bus; lacks ramp-controlled tracking for multi-rail coordination | Choose for higher current or wider VIN; omit if RC-based sequencing is required. |
| RT7297BZSP | 2A, 4.5–18V input, 600kHz fixed frequency, integrated boot diode, no EN/DLY delay or RC pin | Fixed-frequency simplifies EMI filtering but limits optimization for size/noise; no soft-start or tracking capability | Choose for cost-sensitive, non-sequencing 12V-to-1.2V conversion; not suitable for FPGA tracking or pre-bias scenarios. |
Compared with TPS54227PWR and RT7297BZSP, the MIC22205YML-TR uniquely combines 2A capability with RC-based voltage tracking, EN/DLY programmable delay, and pre-bias safe start-up-making it optimal for tightly coordinated, low-voltage, multi-rail FPGA and ASIC power systems where timing integrity and reliability under hot-swap conditions are critical.
Availability
MIC22205YML-TR is available at Aetrix Electronics and suitable for FPGA power delivery, telecom base station POL conversion, and consumer SoC power management requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC22205YML-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. It specialized in high-performance power management, timing, and interface solutions.
The MIC22205YML-TR belongs to Micrel's MIC22xxx family of high-efficiency synchronous buck regulators designed specifically for low-voltage, high-transient point-of-load applications in computing, networking, and consumer electronics.
FAQ
What is the maximum supported switching frequency for MIC22205YML-TR?
The MIC22205YML-TR supports a programmable switching frequency range from 300kHz to 4MHz, set by an external capacitor on the CF pin. For example, a 68pF capacitor yields ~4MHz operation. Frequencies above 1MHz enable smaller magnetics and improved transient response, while lower frequencies improve light-load efficiency and reduce EMI filtering complexity. The device maintains stability and regulation across the full range when proper compensation and layout guidelines are followed.
Does MIC22205YML-TR support start-up into a pre-biased output?
Yes, the MIC22205YML-TR is explicitly designed for safe pre-bias start-up. It holds the low-side N-channel MOSFET off during initial power-on until the feedback voltage reaches 90% of the 0.7V reference, preventing reverse inductor current and output voltage overshoot. This behavior is confirmed in the datasheet's "Pre-Bias Start-Up" section and validated across −40°C to +125°C. The MIC22205YML-TR remains stable even when the output is pre-charged to voltages up to the input rail.
How is output voltage adjusted on MIC22205YML-TR?
The MIC22205YML-TR uses a resistor divider from VOUT to ground connected to the FB pin, which is internally regulated to 0.7V. The output voltage is calculated as VOUT = 0.7V × (1 + R1/R2), where R1 connects VOUT to FB and R2 connects FB to ground. A 10kΩ or lower value for R1 is recommended to minimize noise susceptibility. A 50–100pF capacitor across R2 further improves noise immunity. The MIC22205YML-TR supports outputs as low as 0.7V and scales linearly with the divider ratio.
What is the purpose of the RC pin on MIC22205YML-TR?
The RC pin on the MIC22205YML-TR provides a precision 1µA current source/sink that controls output voltage ramp rate during start-up and shutdown. When used with an external capacitor, it implements soft-start; when driven by another MIC22xxx or MIC68xxx device's RC pin, it enables voltage tracking between multiple regulators. This feature ensures monotonic, controlled power-up sequences and eliminates voltage mismatches in multi-rail systems-critical for FPGA and ASIC reliability. The MIC22205YML-TR's RC functionality is not replicated in most competing 2A buck regulators.
What package type and thermal characteristics does MIC22205YML-TR use?
The MIC22205YML-TR uses a 12-pin, 3mm × 3mm MLF® (MicroLeadFrame) package with an exposed thermal pad (EP/GND). Its thermal resistance is θJA = 40°C/W and θJC = 28.7°C/W when mounted on a standard 5-square-inch PCB with adequate copper pour. The exposed pad must be soldered to a solid GND plane to achieve full 2A output capability and meet the −40°C to +125°C junction temperature specification. This package is RoHS-compliant, halogen-free, and uses NiPdAu lead finish.
MIC22205YML-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 12-VFDFN Exposed Pad, 12-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):
- 2.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.7V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 2A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MLF™ (3x3)
MIC22205YML-TR FAQ
1.How can I place an order for MIC22205YML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC22205YML-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 MIC22205YML-TR reliable?
The price and inventory of MIC22205YML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC22205YML-TR is usually 5 days.
3.What payment methods are accepted for MIC22205YML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC22205YML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC22205YML-TR?
MIC22205YML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC22205YML-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 MIC22205YML-TR?
For technical support, including MIC22205YML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC22205YML-TR requirements.
6.How does Aetrix verify that MIC22205YML-TR is sourced from the original manufacturer or authorized distributors?
All MIC22205YML-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 MIC22205YML-TR meets industry standards.
7.What is the process for return or replacement of MIC22205YML-TR?
All MIC22205YML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC22205YML-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 MIC22205YML-TR part is unused and in its original packaging.
Return procedure for MIC22205YML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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