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Microchip Technology MIC22405YML-TR
- Part No.:
- MIC22405YML-TR
- Manufacturer:
- Microchip Technology
- Package:
- 20-VFQFN Exposed Pad, 20-MLF®
- Datasheet:
-
MIC22405YML-TR.pdf
- Description:
- IC REG BUCK ADJ 4A 20MLF
- Quantity:
- Payment:
- Shipping:
Inventory:4,475
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Product details
Overview
MIC22405YML-TR from Micrel is a 4A synchronous buck regulator IC with integrated high-side P-channel and low-side N-channel MOSFETs, operating from 2.9V–5.5V input and delivering adjustable output down to 0.7V. It achieves >95% efficiency at 1MHz switching, features programmable frequency (300kHz–4MHz), ultra-fast transient response for FPGA/ASIC loads, and pre-bias safe start-up. Used in high-density point-of-load power conversion for servers and base stations.
For engineers reviewing the MIC22405YML-TR datasheet, MIC22405YML-TR pinout, MIC22405YML-TR application, or MIC22405YML-TR equivalent, key selection considerations include its 20-pin 3mm×4mm MLF® package, 100% duty cycle capability, RC-controlled soft-start/tracking, EN/DLY sequencing, and ±0.3% feedback reference accuracy over temperature.
Technical Context
The MIC22405YML-TR implements voltage-mode PWM control with an internal ramp generator and error amplifier comparing FB to a 0.7V reference. Its control loop supports stable operation with ceramic output capacitors (22µF–470µF) and inductors (0.47µH–4.7µH), achieving 100–200kHz gain bandwidth for fast load transients.
It integrates dual MOSFETs (60mΩ high-side, 35mΩ low-side), thermal shutdown (150°C trip), current-limit protection (4–14A), and precision enable threshold (1.24V ±10mV) with 1µA pull-up. The RC pin provides 1µA current source/sink for accurate output voltage slew rate control during startup and shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 5.5V - supports single-supply operation from common logic rails (3.3V, 5V) without external LDO pre-regulation. |
| Output Current | Up to 4A continuous - sufficient for powering core logic of FPGAs, DSPs, and low-voltage ASICs. |
| Switching Frequency | Programmable 300kHz to 4MHz via CF capacitor - enables optimization of size (high-freq) vs. efficiency (low-freq) and EMI filtering. |
| Feedback Reference | 0.7V ±1.4% (0.686–0.714V) - sets output voltage via resistor divider; tight tolerance ensures <0.2% load/line regulation. |
| Efficiency | >95% at 1MHz, VIN=5V, VOUT=1.8V, IOUT=2A - minimizes thermal stress and PCB area in space-constrained PoL designs. |
| Duty Cycle Range | 0% to 100% - maintains regulation even during input dropout conditions (e.g., brown-out recovery). |
| Junction Temp Range | –40°C to +125°C - qualified for industrial and telecom infrastructure environments with no derating up to 125°C. |
Pinout & Package
Package: 20-pin 3mm × 4mm MLF® (MicroLeadFrame) with exposed thermal pad (EP/GND). RoHS-compliant, Pb-free NiPdAu lead finish, halogen-free mold compound.
| 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 (CF) | Frequency programming input | Capacitor-to-ground sets switching frequency (300kHz–4MHz); 400µA internal current source. |
| 4 (COMP) | Compensation network node | Accepts RC network (e.g., 20kΩ + 15–220pF) to stabilize voltage-mode loop with ceramic output caps. |
| 6 (FB) | Error amplifier inverting input | Regulated to 0.7V; connects to resistor divider from VOUT to set output voltage (VOUT = 0.7V × (1 + R1/R2)). |
| 7 (SGND) | Signal ground reference | Separate low-noise ground for analog circuits (error amp, reference, PG comparator); must be star-connected to EP. |
| 8 (SVIN) | Signal power supply | Bypassed with 2.2µF ceramic to SGND; powers internal analog circuitry; tied externally to PVIN. |
| 10,17 (PVIN) | Main power input | Connects to input rail (2.9–5.5V); each requires 22µF X5R/X7R ceramic bypass; feeds high-side MOSFET. |
| 11,16 (PGND) | Power ground return | Source connection for low-side N-MOSFET; must be low-inductance path to EP and input/output caps. |
| 12–15 (SW) | Switch node | Drain connection of both internal MOSFETs; high-di/dt node requiring short, wide copper traces to minimize EMI and losses. |
| 18 (EN/DLY) | Enable with programmable delay | 1µA internal current source charges external capacitor; turn-on delayed until voltage reaches 1.24V threshold. |
| 19 (NC) | No connect | Must remain unconnected; floating or grounded may cause malfunction. |
| 20 (RC) | Ramp Control for soft-start/tracking | 1µA current source/sink controls output voltage slew rate; enables precise voltage tracking across multiple rails. |
| EP (GND) | Exposed thermal pad | Must be soldered to solid GND plane for thermal conduction (θJC = 25°C/W) and full 4A output capability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual MOSFETs | 60mΩ P-ch high-side + 35mΩ N-ch low-side eliminate external switch losses and simplify layout. |
| Pre-bias safe start-up | Starts with low-side MOSFET disabled to prevent reverse inductor current and output oscillation on pre-charged outputs. |
| Full sequencing & tracking | EN/DLY + PG pins enable arbitrary power-on/off sequencing; RC pin allows ratio-metric voltage ramping across multiple regulators. |
| Ultra-fast transient response | Control loop maintains output regulation within ±1% during 1A–4A load steps typical of FPGA core switching. |
| Easy RC compensation | Internal pole-zero simplifies stability design; only one external capacitor (15–220pF) needed with 20kΩ resistor on COMP pin. |
Applications
| High-Density Point-of-Load Conversion | Servers and Base Stations |
|---|---|
Use Scenario: Compact DC-DC conversion directly adjacent to FPGA or ASIC core logic on dense server motherboard. IC Role / Device Role / Timing Role: Primary 4A step-down regulator delivering 0.7–3.3V core voltage with programmable 1MHz switching. Use Value: >95% efficiency reduces localized heat generation; 3mm×4mm MLF® package saves >40% board area vs. discrete solutions. | Use Scenario: Multi-rail power management in 5G base station RF front-end modules requiring synchronized voltage ramps. IC Role / Device Role / Timing Role: Sequenced output regulator using EN/DLY and RC pins to track auxiliary supply during power-up/down. Use Value: RC-controlled slew rate prevents voltage overshoot on sensitive RF ICs; PG flag enables downstream reset assertion. |
| DVD/Blu-ray Player SoC Power | FPGA Core Supply |
Use Scenario: Single-chip power solution for media processor SoC with dynamic DVFS voltage scaling between 1.0V and 1.2V. IC Role / Device Role / Timing Role: Adjustable-output buck regulator with 0.7V reference enabling precise low-voltage setting via FB divider. Use Value: 0.2% line/load regulation ensures stable SoC operation across varying input and load conditions. | Use Scenario: Dedicated core voltage supply for Xilinx Artix-7 FPGA requiring 1.0V ±3% with fast transient recovery. IC Role / Device Role / Timing Role: High-efficiency 4A synchronous buck delivering regulated 1.0V from 3.3V input with 100% duty cycle support. Use Value: Ultra-fast transient response holds output within spec during 2A load steps; pre-bias safety avoids damage during hot-swap events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS544B20RTWR | 4A, 4.5–18V input, 0.6V ref, 2MHz max freq, QFN-17 package (4×4mm) | Wider input range but higher minimum VIN; less suitable for 3.3V-only systems | Select if input exceeds 5.5V or higher-frequency operation required; not drop-in due to different pinout and bias requirements. |
| ISL85415IRZ-T7A | 5A, 3–18V input, 0.6V ref, 1MHz fixed freq, 20-pin QFN (4×4mm) | Higher current rating and wider VIN, but fixed frequency and no RC tracking capability | Choose for higher output current headroom or simpler design without frequency programming; lacks MIC22405YML-TR's soft-start precision. |
Compared with TPS544B20RTWR and ISL85415IRZ-T7A, the MIC22405YML-TR offers superior low-input-voltage operation (down to 2.9V), programmable frequency tuning, and dedicated RC-based voltage tracking-making it optimal for tightly regulated, multi-rail embedded systems where input headroom and sequencing fidelity are critical.
Availability
MIC22405YML-TR is available at Aetrix Electronics and suitable for high-density point-of-load conversion, FPGA core power, and telecom infrastructure applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC22405YML-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 semiconductor company specializing in power management, timing, and interface ICs before its acquisition by Microchip Technology in 2015. Known for high-efficiency DC-DC regulators and precision analog products.
The MIC22xxx family-including MIC22405YML-TR-is designed specifically for high-current, high-efficiency point-of-load conversion in space-constrained digital systems, emphasizing fast transient response, sequencing flexibility, and robust thermal performance.
FAQ
What is the maximum output current capability of the MIC22405YML-TR?
The MIC22405YML-TR delivers up to 4A continuous output current under thermal limits (θJA = 55°C/W, TJ ≤ 125°C). Its internal MOSFETs (60mΩ high-side, 35mΩ low-side) and 20-pin MLF® package with exposed pad enable this rating without external switches. Derating applies above 85°C ambient; full 4A is validated at TA = 25°C with proper PCB copper area.
How does the MIC22405YML-TR achieve pre-bias safe start-up?
The MIC22405YML-TR starts with the low-side N-channel MOSFET disabled, preventing reverse inductor current flow into a pre-charged output. Only after the RC pin voltage rises above the 0.7V reference-and FB reaches 90% of target-does the low-side switch activate. This behavior is confirmed in the datasheet's Figure 4 (EN Turn-On at 1V Pre-Bias) and eliminates output oscillation during hot-swap or multi-rail sequencing events.
Can the MIC22405YML-TR operate with 100% duty cycle, and under what conditions?
Yes, the MIC22405YML-TR supports 100% duty cycle operation when the feedback voltage drops below 0.5V-enabling regulation during input voltage dropout (e.g., VIN falling near VOUT). This is explicitly specified in the Electrical Characteristics table (Maximum Duty Cycle = 100% at VFB ≤ 0.5V) and critical for brown-out recovery in systems powered from weak or battery-derived supplies.
What is the purpose of the RC pin on the MIC22405YML-TR, and how is it used?
The RC pin on the MIC22405YML-TR provides a precision 1µA current source/sink to control output voltage slew rate during startup and shutdown. Connecting a capacitor to ground sets linear ramp time (tRAMP = 0.7 × CRC × 10⁶ seconds); driving RC with an external voltage enables ratio-metric tracking. This feature is documented in the Pin Description (page 3) and Application Information (page 17) of the MIC22405 datasheet.
Is the MIC22405YML-TR compatible with ceramic output capacitors, and what are the recommended values?
Yes, the MIC22405YML-TR is optimized for ceramic output capacitors with X5R or X7R dielectrics. Recommended range is 22µF to 470µF; 100µF is typical for 1µH inductors. Y5V/Z5U types are prohibited due to capacitance loss and ESR rise at high frequencies, which risk instability. These guidelines are detailed in the "Output Capacitor" section (page 14) of the datasheet.
MIC22405YML-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):
- 2.9V
- 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)
MIC22405YML-TR FAQ
1.How can I place an order for MIC22405YML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC22405YML-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 MIC22405YML-TR reliable?
The price and inventory of MIC22405YML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC22405YML-TR is usually 5 days.
3.What payment methods are accepted for MIC22405YML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC22405YML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC22405YML-TR?
MIC22405YML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC22405YML-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 MIC22405YML-TR?
For technical support, including MIC22405YML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC22405YML-TR requirements.
6.How does Aetrix verify that MIC22405YML-TR is sourced from the original manufacturer or authorized distributors?
All MIC22405YML-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 MIC22405YML-TR meets industry standards.
7.What is the process for return or replacement of MIC22405YML-TR?
All MIC22405YML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC22405YML-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 MIC22405YML-TR part is unused and in its original packaging.
Return procedure for MIC22405YML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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