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Microchip Technology MIC2145YML-TR
- Part No.:
- MIC2145YML-TR
- Manufacturer:
- Microchip Technology
- Package:
- 10-VFDFN Exposed Pad, 10-MLF®
- Datasheet:
-
MIC2145YML-TR.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 10MLF
- Quantity:
- Payment:
- Shipping:
Inventory:3,642
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Product details
Overview
MIC2145YML-TR from Micrel is a high-efficiency, adjustable-output boost switching regulator delivering over 2.5W output power with input range 2.4V–16V and programmable peak switch current up to 2A. It features 450kHz switching frequency, 200µA quiescent current, and 0.5µA shutdown current. Designed for space-constrained portable systems, it supports LCD bias, white LED driving, and DSL local voltage conversion.
For engineers reviewing the MIC2145YML-TR datasheet, MIC2145YML-TR pinout, MIC2145YML-TR application, or MIC2145YML-TR equivalent, key selection criteria include programmable peak current limit (via RSET), soft-start control (SS pin), feedback reference voltage (1.08V ±2%), thermal shutdown protection, and compatibility with 3mm×3mm MLF-10L package layout constraints.
Technical Context
The MIC2145YML-TR implements constant-off-time regulation with dual comparator control: one monitors inductor peak current (programmed via external RSET resistor), the other regulates output voltage via FB pin with 18mV hysteresis. Its internal 250mΩ (typ) MOSFET switch enables high efficiency at light-to-moderate loads.
It supports both basic (VDD tied to VIN) and bootstrapped (VDD tied to VOUT) configurations to optimize efficiency across load ranges-bootstrap mode improves heavy-load (>70mA) performance while basic mode favors light-load operation. Soft start is implemented via external capacitor on SS pin, controlling both output rise time and initial current limit threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.4V to 16V - supports single-cell Li-ion and 3–4-cell alkaline/NiMH battery inputs. |
| Output Voltage Range | Adjustable up to 16V - set via external resistor divider on FB pin with 1.08V reference. |
| Peak Switch Current | Programmable 0.42A–2A - configured by RSET resistor to match inductor saturation and optimize efficiency. |
| Switching Frequency | Up to 450kHz - enables use of compact 4.7µH or 10µH surface-mount inductors. |
| Quiescent Current | 200µA (typ) - minimizes battery drain in always-on portable applications. |
| Shutdown Current | 0.5µA (typ) - ensures ultra-low leakage during system sleep modes. |
| Feedback Reference | 1.08V ±2% - determines output voltage accuracy and stability across temperature. |
| Package | 3mm×3mm MLF-10L - thermally enhanced 10-pin exposed-pad package with θJA = 60°C/W. |
Pinout & Package
The MIC2145YML-TR is housed in a 3mm×3mm, 10-lead MLF™ package with exposed thermal pad. Pin numbering follows standard MLF orientation with Pin 1 marked by dot or bevel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | EN | Enable input: logic-high ≥1.5V activates regulator; ≤0.7V disables with 0.5µA shutdown current. |
| 2 | SS | Soft-start capacitor node: external capacitor sets output voltage ramp rate and initial current limit. |
| 3 | RSET | Peak current limit programming: resistor value sets switch current threshold (0.42A–2A range). |
| 4,5 | PGND | Power ground return: low-impedance path for MOSFET source and high-current switching loop. |
| 6,7 | SW | Switch node: connects to MOSFET drain and external inductor/diode; handles high dv/dt switching transitions. |
| 8 | VDD | Supply input: powers internal circuitry; can be connected to VIN (basic) or VOUT (bootstrap) for efficiency tuning. |
| 9 | FB | Feedback input: senses output voltage via resistor divider; regulates to 1.08V reference with 18mV hysteresis. |
| 10 | SGND | Small-signal ground: separate analog ground return for FB, EN, SS, RSET to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Peak Current Limit | Set externally via RSET resistor to match inductor saturation and maximize efficiency across load conditions. |
| Configurable Power Topology | Supports BOOST, SEPIC, and FLYBACK topologies - enables flexible voltage step-up, buck-boost, or isolated designs. |
| Thermal Shutdown Protection | Automatic shutdown at ~150°C junction temperature - prevents damage during overload or poor heatsinking. |
| Low-Noise Feedback Architecture | 18mV comparator hysteresis + optional feed-forward capacitor (CFF) reduces output ripple and improves transient response. |
| High-Efficiency MOSFET Switch | 250mΩ (typ) on-resistance at 10V VDD - minimizes conduction loss and enables >85% efficiency at 10V/100mA output. |
Applications
| Flash LED Driver | LCD Bias Supply |
|---|---|
Use Scenario: Driving high-brightness flash LEDs in smartphone cameras requiring stable 5V–15V rail from 3.0–5.0V battery input. IC Role / Device Role / Timing Role: Boost converter providing regulated, programmable current-limited output with soft-start to prevent inrush. Use Value: Achieves >85% efficiency at 15V/100mA using 10µH inductor and MBR0530 Schottky diode per reference design. | Use Scenario: Generating 10V bias for TFT-LCD panel gate drivers in handheld displays powered by 3.6V Li-ion battery. IC Role / Device Role / Timing Role: Adjustable boost regulator operating in bootstrap configuration to sustain high efficiency (>80%) at 10V/250mA load. Use Value: Enables compact 3mm×3mm MLF layout with integrated soft-start and thermal shutdown for reliable field operation. |
| White LED Driver | DSL Local 3V-to-5V Conversion |
Use Scenario: Powering 1–10 parallel white LEDs in portable lighting or backlighting with dimming control via EN pin. IC Role / Device Role / Timing Role: Constant-voltage boost source with programmable peak current limiting to avoid LED overcurrent during transients. Use Value: Delivers 2.5W output with <0.5µA shutdown current, extending battery life in always-ready devices. | Use Scenario: Generating clean 5V local supply from 3.3V system rail in DSL line card or modem subsystems. IC Role / Device Role / Timing Role: High PSRR, low-noise boost converter supporting noise-sensitive analog front-end circuits. Use Value: Maintains >80% efficiency at 5V/500mA with 3.3V input using basic configuration and 4.7µH inductor per Table 3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRVR | Fixed 28V OVP, 500kHz switching, 0.5A internal switch, no RSET programmability | Lacks peak current adjustment; less flexible for inductor optimization or wide output range | Preferred when fixed 28V OVP and simpler BOM outweigh need for programmable current limit |
| LT3467EDD#TRPBF | 2.5MHz switching, 1.3A switch, integrated soft-start, ±1.5% FB reference | Higher frequency allows smaller magnetics but higher EMI; tighter FB tolerance improves output accuracy | Chosen for space-critical designs needing sub-2mm inductors and tighter regulation, accepting higher quiescent current (1.2mA) |
Compared with TPS61040DRVR and LT3467EDD#TRPBF, the MIC2145YML-TR offers unique programmable peak current control for inductor size/efficiency trade-off, lower quiescent current (200µA vs. 1.2mA), and wider input range (2.4–16V), making it optimal for battery-powered systems requiring adaptable power stage tuning.
Availability
MIC2145YML-TR is available at Aetrix Electronics and suitable for LCD bias supplies, white LED drivers, DSL local converters, and portable flash lighting requiring stable component supply and long-term production continuity.
Supply support for MIC2145YML-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. Known for high-performance power management and timing solutions.
The MIC2145 product line was designed specifically for compact, high-efficiency DC-DC boost conversion in battery-powered portable electronics, emphasizing low quiescent current, thermal robustness, and topology flexibility (BOOST/SEPIC/FLYBACK).
FAQ
What is the maximum output voltage supported by the MIC2145YML-TR?
The MIC2145YML-TR supports output voltages up to 16V, limited by its internal switch voltage rating. This is achieved using an external resistor divider on the FB pin referenced to the 1.08V internal bandgap. Output voltages above 16V require flyback topology implementation rather than basic boost configuration.
How does the RSET pin function in the MIC2145YML-TR?
The RSET pin on the MIC2145YML-TR sets the peak switch current limit via an external resistor. With RSET = 200Ω, peak current is ~0.8A at 3.6V VDD; with RSET = 1kΩ, it rises to ~0.9A at 10V VDD. The relationship is nonlinear and documented in the "Peak Current Limit vs. RSET" curve - enabling precise matching to inductor saturation and load requirements.
Can the MIC2145YML-TR operate in SEPIC or flyback topologies?
Yes, the MIC2145YML-TR explicitly supports SEPIC and flyback topologies per its datasheet Features section and Functional Diagram. Its constant-off-time architecture and integrated current-limit comparator allow reconfiguration beyond basic boost - for example, flyback operation enables isolated outputs or voltages exceeding 16V, provided transformer design meets voltage/current ratings.
What is the thermal performance difference between the MLF-10L and MSOP-8 packages for the MIC2145YML-TR?
The MIC2145YML-TR's 3mm×3mm MLF-10L package has θJA = 60°C/W, significantly better than the MSOP-8's θJA = 206°C/W. This 3.4× improvement in thermal resistance allows higher continuous output power in compact layouts - critical for sustained 2.5W operation in portable devices without forced airflow or large copper areas.
Does the MIC2145YML-TR include built-in protection features?
Yes, the MIC2145YML-TR integrates thermal shutdown (trips at ~150°C junction temperature), overcurrent protection via programmable peak current limit, and undervoltage lockout inherent to its 2.4V minimum input specification. It also features soft-start to limit inrush current and feedback hysteresis (18mV) to prevent oscillation near regulation thresholds.
MIC2145YML-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad, 10-MLF®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.4V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 2.4V
- Voltage - Output (Max):
- 16V
- Current - Output:
- 500mA
- Frequency - Switching:
- 450kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MLF® (3x3)
MIC2145YML-TR FAQ
1.How can I place an order for MIC2145YML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2145YML-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 MIC2145YML-TR reliable?
The price and inventory of MIC2145YML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2145YML-TR is usually 5 days.
3.What payment methods are accepted for MIC2145YML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2145YML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2145YML-TR?
MIC2145YML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2145YML-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 MIC2145YML-TR?
For technical support, including MIC2145YML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2145YML-TR requirements.
6.How does Aetrix verify that MIC2145YML-TR is sourced from the original manufacturer or authorized distributors?
All MIC2145YML-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 MIC2145YML-TR meets industry standards.
7.What is the process for return or replacement of MIC2145YML-TR?
All MIC2145YML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2145YML-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 MIC2145YML-TR part is unused and in its original packaging.
Return procedure for MIC2145YML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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