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Microchip Technology MIC22950YML-TR
- Part No.:
- MIC22950YML-TR
- Manufacturer:
- Microchip Technology
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
MIC22950YML-TR.pdf
- Description:
- IC REG BUCK ADJ 10A 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:700
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Product details
Overview
MIC22950YML-TR from Micrel is a 10A integrated synchronous buck regulator IC with programmable switching frequency (400 kHz to 2 MHz), adjustable output voltage down to 0.7 V, and ultra-fast transient response optimized for FPGA and low-voltage ASIC power delivery in high-density point-of-load applications.
For engineers reviewing the MIC22950YML-TR datasheet, MIC22950YML-TR pinout, MIC22950YML-TR application, or MIC22950YML-TR equivalent, key selection considerations include its 32-pin 5 mm × 5 mm MLF® package, 2.6 V–5.5 V input range, integrated 11 mΩ P-FET / 8 mΩ N-FET switches, ramp-controlled soft-start via RC pin, and full sequencing capability using EN/DLY, DELAY, and POR/PG pins.
Technical Context
The MIC22950YML-TR implements a voltage-mode PWM control architecture with an internal ramp generator driven by the CF pin's 200 µA current source charging an external capacitor. Its control loop achieves >95% efficiency at 2 MHz across broad load ranges while maintaining regulation under extreme transient loads typical of FPGAs.
Sequencing and tracking are enabled through three dedicated pins: EN/DLY (1.24 V enable threshold with 1 µA pull-up), DELAY (1 µA timer for POR/PG assertion delay), and RC (1 µA programmable slew-rate control for output voltage ramp-up/down). All functions operate across −40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 10 A continuous - supports high-power digital loads like FPGAs without external current sharing. |
| Input Voltage Range | 2.6 V to 5.5 V - compatible with standard 3.3 V and 5 V intermediate bus rails. |
| Adjustable Output Voltage | Down to 0.7 V - enables direct regulation for sub-1 V core supplies (e.g., 0.85 V, 0.9 V, 1.0 V, 1.2 V, 1.8 V). |
| Switching Frequency | 400 kHz to 2 MHz - selectable via CF pin capacitor; higher frequencies reduce inductor/capacitor size but increase switching losses. |
| Efficiency | >95% at 2 MHz - achieved with integrated 11 mΩ P-FET and 8 mΩ N-FET, enabling compact, high-efficiency PoL designs. |
| Thermal Protection | 160°C over-temperature shutdown with 20°C hysteresis - prevents thermal runaway during sustained overload or poor PCB heatsinking. |
| Feedback Reference | 0.714 V (max) ±2% over temperature - sets output accuracy; used with external resistor divider on FB pin. |
Pinout & Package
Package: 32-pin 5 mm × 5 mm MLF® (MicroLeadFrame) with exposed center thermal pad (EP/GND), rated for −40°C to +125°C junction operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 1,2,7,8,17,23,24) | Power Input Supply | Bypassed with 22 µF ceramic per pin; feeds high-side P-FET; requires low-ESR capacitors near IC. |
| EN/DLY (Pin 3) | Enable & Startup Delay Control | 1.24 V threshold; 1 µA internal current source charges external capacitor to set turn-on delay before regulation begins. |
| RC (Pin 5) | Ramp Control | 1 µA current source/sink controls output voltage slew rate; minimum 120 pF required; enables soft-start and tracking. |
| POR/PG (Pin 6) | Power-On Reset / Power-Good Output | Open-drain signal asserted high when VOUT ≥90% nominal and after DELAY timeout; indicates stable regulation. |
| SW (Pins 11,12,13,14,27,28,29,30) | Switch Node | Connection between internal P-FET source and N-FET drain; high-frequency, high-current path requiring short/wide PCB traces. |
| FB (Pin 20) | Feedback Input | Connects to resistor divider; compares against 0.7 V reference to regulate output; <1 nA input bias minimizes divider error. |
| COMP (Pin 21) | Compensation Network | External RC network (e.g., 1 kΩ + 10–47 pF) stabilizes voltage-mode loop; simplifies design vs. full external compensation. |
| EP / GND (Center Pad) | Thermal & Power Ground | Must be fully soldered to internal GND plane; critical for thermal dissipation and achieving full 10 A output capability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MOSFETs | 11 mΩ P-channel and 8 mΩ N-channel switches eliminate external FETs and gate drivers, reducing BOM count and layout complexity. |
| Programmable Frequency | 400 kHz–2 MHz via CF pin capacitor - allows trade-off between efficiency (lower fSW) and solution size (higher fSW). |
| Full Sequencing Support | EN/DLY, DELAY, and POR/PG pins enable precise power-up/power-down ordering across multiple rails without external logic. |
| Ramp-Controlled Soft-Start | RC pin sets monotonic output ramp rate - prevents inrush current, enables voltage tracking, and eliminates need for external soft-start ICs. |
| Ultra-Fast Transient Response | Stabilizes output within microseconds under step-load changes up to 10 A - critical for FPGA core supply stability during burst-mode operation. |
Applications
| Base Station RF Power Amplifier Bias | FPGA Core Voltage Regulation |
|---|---|
Use Scenario: Providing tightly regulated, low-noise 1.0 V bias to GaN RF power amplifiers in 5G macro base stations where rapid load transients occur during TDD switching. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 10 A peak current with <10 µs transient recovery and <±1% output deviation. Use Value: Enables single-chip 1.0 V generation with no external MOSFETs or complex compensation, reducing board area by >35% vs. controller+discrete solution. |
Use Scenario: Supplying configurable core voltage (0.7–1.2 V) to Xilinx Kintex or Intel Stratix FPGA banks during dynamic partial reconfiguration. IC Role / Device Role / Timing Role: Adjustable PoL converter with programmable soft-start (RC pin) and sequenced enable (EN/DLY) to meet FPGA power-up timing requirements. Use Value: Eliminates need for discrete sequencing ICs; RC-controlled ramp ensures voltage tracking between I/O and core rails during configuration. |
| Server CPU VRM Auxiliary Rail | Blu-ray Player SoC Power |
Use Scenario: Generating 1.8 V auxiliary rail for memory interface buffers and PCIe SerDes in dual-socket server motherboards with strict ripple and sequencing constraints. IC Role / Device Role / Timing Role: Secondary synchronous buck regulator synchronized via RC pin to primary VRM for ratio-metric tracking during power-up. Use Value: Achieves <±20 mV tracking error between 1.8 V and 1.2 V rails using only passive components - no additional ICs or firmware required. |
Use Scenario: Delivering 3.3 V and 1.2 V rails to Broadcom BCM7445 SoC in Blu-ray disc players where EMI compliance and thermal limits constrain solution size. IC Role / Device Role / Timing Role: Compact 5 mm × 5 mm MLF® buck regulator operating at 1.5 MHz to minimize filter component size and meet CISPR-32 Class B radiated emissions. Use Value: 95% efficiency at 2 MHz reduces heat sink requirement; lead-free MLF® package meets RoHS and halogen-free mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ8633BGLE-10-Z | 10 A, 2.7–16 V input, fixed 10 mΩ/8 mΩ FETs, 300 kHz–2.2 MHz fSW, QFN-16 package | Wider VIN range but lacks RC-based ramp control and multi-rail sequencing pins (no DELAY/POR/PG) | Preferred for industrial 12 V input systems needing higher VIN tolerance; not drop-in for FPGA sequencing-critical designs. |
| TPS546D24RSAR | 10 A, 4–18 V input, PMBus interface, 3.3 mΩ/1.9 mΩ FETs, 250 kHz–1.5 MHz fSW, 20-pin QFN | Digital control with telemetry and fault logging; no analog RC ramp or DELAY pin; larger footprint | Chosen when system-level monitoring, margining, or dynamic voltage scaling is required; adds firmware overhead vs. MIC22950YML-TR's analog simplicity. |
Compared with MPQ8633BGLE-10-Z and TPS546D24RSAR, the MIC22950YML-TR uniquely integrates analog sequencing (EN/DLY, DELAY, POR/PG) and programmable slew rate (RC) in a compact MLF® package-enabling deterministic, firmware-free multi-rail coordination ideal for FPGA and ASIC power trees.
Availability
MIC22950YML-TR is available at Aetrix Electronics and suitable for high-power density point-of-load conversion, FPGA/ASIC core supply, and telecom infrastructure applications requiring stable component supply and long-term production continuity.
Supply support for MIC22950YML-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, analog, and mixed-signal ICs, acquired by Microchip Technology in 2015. Its legacy power products emphasize high integration and robust analog control.
The MIC22950YML-TR belongs to Micrel's MIC22x00 family of integrated synchronous buck regulators, designed specifically for high-current, low-voltage point-of-load applications in computing, networking, and consumer electronics where small size, fast transient response, and sequencing capability are essential.
FAQ
What is the maximum output current capability of the MIC22950YML-TR?
The MIC22950YML-TR delivers up to 10 A continuous output current under proper thermal conditions - verified across −40°C to +125°C junction temperature with adequate PCB copper area and the EP/GND pad fully soldered to a thermal plane. Peak current limit is internally set at 16.5 A (typical), providing headroom for transient loads without external current sensing.
How is the switching frequency programmed on the MIC22950YML-TR?
The MIC22950YML-TR switching frequency is set by an external capacitor connected to the CF pin. A 200 µA internal current source charges this capacitor to 1 V, defining the switching period. Using a 390 pF capacitor yields ~510 kHz (typical); values from 68 pF to 560 pF scale frequency from ~1.7 MHz down to ~400 kHz, as shown in the datasheet's Figure 3.
Can the MIC22950YML-TR be used for voltage tracking between multiple rails?
Yes - the MIC22950YML-TR supports both ratio-metric and normal voltage tracking via its RC pin. When the RC pin of one device is driven by the output of another (or by a shared ramp source), output voltages track during startup/shutdown. The datasheet provides explicit circuit examples for two-MIC22950 tracking configurations with matched rise/fall times.
What is the purpose of the DELAY pin on the MIC22950YML-TR?
The DELAY pin on the MIC22950YML-TR controls the timing of the POR/PG signal assertion. A capacitor from DELAY to SGND is charged by a 1 µA current source once FB reaches 90% of nominal output. When DELAY voltage hits 1.24 V, POR/PG goes high - enabling controlled sequencing of downstream circuits or other regulators without external timers.
Does the MIC22950YML-TR require external compensation components?
Yes - the MIC22950YML-TR uses simplified external compensation via the COMP pin. A series RC network (e.g., 1 kΩ resistor + 10–47 pF capacitor to SGND) is required to stabilize the voltage-mode control loop. The recommended values depend on inductor and output capacitor selection, with tables provided in the datasheet for common L/C combinations.
MIC22950YML-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- 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:
- 10A
- Frequency - Switching:
- 400kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
MIC22950YML-TR FAQ
1.How can I place an order for MIC22950YML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC22950YML-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 MIC22950YML-TR reliable?
The price and inventory of MIC22950YML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC22950YML-TR is usually 5 days.
3.What payment methods are accepted for MIC22950YML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC22950YML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC22950YML-TR?
MIC22950YML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC22950YML-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 MIC22950YML-TR?
For technical support, including MIC22950YML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC22950YML-TR requirements.
6.How does Aetrix verify that MIC22950YML-TR is sourced from the original manufacturer or authorized distributors?
All MIC22950YML-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 MIC22950YML-TR meets industry standards.
7.What is the process for return or replacement of MIC22950YML-TR?
All MIC22950YML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC22950YML-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 MIC22950YML-TR part is unused and in its original packaging.
Return procedure for MIC22950YML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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