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Microchip Technology MIC2145YML
- Part No.:
- MIC2145YML
- Manufacturer:
- Microchip Technology
- Package:
- 10-VFDFN Exposed Pad, 10-MLF®
- Datasheet:
-
MIC2145YML.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 10MLF
- Quantity:
- Payment:
- Shipping:
Inventory:4,976
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Product details
Overview
MIC2145YML from Micrel is a programmable-peak-current boost switching regulator IC delivering over 2.5W output power, operating from 2.4V–16V input to adjustable up-to-16V output, with 450kHz switching frequency, 200µA quiescent current, and 0.5µA shutdown current-used in portable LCD bias and white LED driver circuits.
For engineers reviewing the MIC2145YML datasheet, MIC2145YML pinout, MIC2145YML application, or MIC2145YML equivalent, key selection criteria include peak current programmability via RSET, soft-start control, thermal shutdown protection, and compatibility with MLF-10L layout for space-constrained designs.
Technical Context
The MIC2145YML implements constant-off-time regulation using dual comparators: one monitors inductor peak current (set externally via RSET), the other regulates output voltage via FB feedback with 1.08V reference and 18mV hysteresis. It features an integrated 250–750mΩ MOSFET switch and built-in soft-start circuitry tied to the SS pin.
Its architecture supports boost, SEPIC, and flyback topologies; bootstrap configuration (VDD connected to VOUT) enables >85% efficiency at heavy loads (>70mA), while basic configuration (VDD to VIN) optimizes light-load performance. Thermal shutdown activates at ~150°C junction temperature.
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. |
| Switching Frequency | Up to 450kHz - enables use of compact 4.7µH or 10µH surface-mount inductors. |
| Peak Switch Current | Programmable 420mA–2A via RSET - allows optimization of efficiency and inductor saturation margin. |
| Quiescent Current | 200µA typical - minimizes battery drain in always-on portable systems. |
| Shutdown Current | 0.5µA typical - ensures ultra-low leakage during system sleep modes. |
| Efficiency | Over 85% at 10V/100mA with 3.3V input - achieved using low-RDS(on) internal MOSFET and optimized gate drive. |
Pinout & Package
The MIC2145YML is housed in a 3mm×3mm, 10-lead MLF™ package with exposed thermal pad, rated for –40°C to +85°C ambient operation and θJA = 60°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EN) | Enable input | Logic-high ≥1.5V enables regulation; ≤0.7V shuts down IC with 0.5µA leakage. |
| 2 (SS) | Soft-start capacitor node | Connect external capacitor to ground to control output voltage ramp rate and initial current limit threshold. |
| 3 (RSET) | Peak current limit programming | Resistor from this pin to SGND sets peak switch current between 420mA–2A. |
| 4,5 (PGND) | Power ground return | Low-impedance path for internal MOSFET source current; must be routed separately from SGND. |
| 6,7 (SW) | Switch node | Drain of internal MOSFET; connects to inductor and catch diode anode in boost topology. |
| 8 (VDD) | Supply input | 2.4V–16V input powering internal circuitry; can be tied to VOUT (bootstrap) or VIN (basic config). |
| 9 (FB) | Feedback input | Senses output voltage via resistor divider; regulates output to 1.08V × (1 + R1/R2). |
| 10 (SGND) | Small-signal ground | Reference for FB, EN, SS, and RSET; must be isolated from PGND to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable peak current limit | Enables precise trade-off between inductor size, efficiency, and saturation margin via single external resistor. |
| Integrated soft-start | Prevents inrush current and output overshoot by gradually ramping both output voltage and current limit threshold. |
| Thermal shutdown protection | Disables switching when junction temperature exceeds ~150°C, preventing damage under overload or poor heatsinking. |
| Low-RDS(on) internal MOSFET | 250mΩ typical at 10V VDD reduces conduction loss and improves full-load efficiency in compact layouts. |
| Multi-topology support | Configurable as boost, SEPIC, or flyback by re-routing external components-no change to IC functionality. |
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 high-voltage output with programmable current limiting to match LED forward voltage and pulse timing. Use Value: Achieves >85% efficiency at 150mA load with 10µH inductor and MBR0530 Schottky diode, minimizing thermal stress in thin form factors. | Use Scenario: Generating 10V bias for TFT-LCD panel gate drivers in handheld medical displays powered by 3.6V Li-ion cells. IC Role / Device Role / Timing Role: Adjustable-output boost regulator supplying clean, ripple-controlled voltage with feed-forward capacitor (CFF) for reduced AC noise. Use Value: Delivers 10V/100mA with <167mV output hysteresis and <10mVpp ripple using GRM42-2 X5R 10µF/16V capacitor and bootstrap configuration. |
| White LED driver | DSL line bias supply |
Use Scenario: Powering 4–10 parallel white LEDs in portable lighting modules with input from 3.0–5.0V USB or battery sources. IC Role / Device Role / Timing Role: Constant-voltage boost controller maintaining LED string voltage across varying load and temperature conditions. Use Value: Supports up to 2.5W output with RSET-adjusted peak current to prevent LED current droop and ensure uniform brightness. | Use Scenario: Providing isolated 12–15V bias for DSL line interface ICs in residential gateways operating from 5V system rails. IC Role / Device Role / Timing Role: High-efficiency boost stage enabling local voltage generation without transformer-based isolation. Use Value: Enables >80% efficiency at 50mA load with 4.7µH inductor and achieves <0.5µA shutdown current for low-power standby compliance. |
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 output; no RSET-based peak current programming; 500kHz fixed frequency; 2.7–5.5V input only. | Not suitable for >5.5V input or adjustable outputs beyond 28V; lacks programmable current limit for inductor optimization. | Select when fixed-output, higher-frequency, and tighter input range are acceptable trade-offs for simplified design. |
| MAX1706BETE+ | Fixed 5V output; 1.2MHz switching; 2.6–5.5V input; integrated diode; no RSET or SS pins. | Designed for low-profile 5V-only applications; cannot support >5.5V input or >5V output; no soft-start or current limit adjustment. | Choose for cost-sensitive, space-limited 5V boost needs where flexibility and wide input range are secondary. |
Compared with TPS61040DRVR and MAX1706BETE+, the MIC2145YML offers broader input (2.4–16V) and output (up to 16V) ranges, plus RSET-programmable peak current for inductor sizing and efficiency tuning-making it uniquely suited for multi-chemistry battery-powered systems requiring configurable high-voltage rails.
Availability
MIC2145YML is available at Aetrix Electronics and suitable for LCD bias supply, white LED driver, flash LED driver, and DSL line bias supply applications requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MIC2145YML 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 headquartered in San Jose, CA, acquired by Microchip Technology in 2015; known for high-performance power management and interface ICs.
The MIC2145 product line delivers compact, high-efficiency boost conversion for portable and space-constrained applications-designed specifically for battery-powered LCD, LED, and telecom biasing where programmability, low quiescent current, and thermal robustness are critical.
FAQ
What is the maximum output voltage supported by the MIC2145YML?
The MIC2145YML 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 reconfiguration-not supported directly by the MIC2145YML's standard boost layout.
How does the RSET pin function in the MIC2145YML?
The RSET pin on the MIC2145YML sets the peak switch current limit via an external resistor to SGND. With RSET = 200Ω, peak current is ~0.8A at 3.6V VDD; with RSET = 1kΩ, it rises to ~0.9A at 10V VDD. This programmability allows designers to match inductor saturation current and optimize efficiency across load conditions.
Can the MIC2145YML operate with a 2.4V input supply?
Yes, the MIC2145YML operates down to 2.4V input, making it compatible with single-cell Li-ion batteries at end-of-discharge. At 2.4V input, it maintains regulation up to 5V output with appropriate RSET and inductor selection; efficiency drops at very low input but remains functional per datasheet operating ratings.
What is the purpose of the SS (soft-start) pin on the MIC2145YML?
The SS pin on the MIC2145YML controls soft-start behavior by accepting an external capacitor to ground. This capacitor linearly ramps the output voltage and simultaneously scales the peak current limit threshold during startup-preventing inrush current, output overshoot, and inductor saturation during turn-on.
Does the MIC2145YML include thermal protection?
Yes, the MIC2145YML incorporates thermal shutdown circuitry that disables the internal MOSFET when junction temperature exceeds approximately 150°C. Recovery occurs automatically once temperature falls below the hysteresis threshold. This feature protects the MIC2145YML and surrounding components during sustained overload or inadequate PCB thermal relief.
MIC2145YML Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad, 10-MLF®
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for MIC2145YML through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2145YML 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 reliable?
The price and inventory of MIC2145YML are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2145YML is usually 5 days.
3.What payment methods are accepted for MIC2145YML?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2145YML transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2145YML?
MIC2145YML orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2145YML 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?
For technical support, including MIC2145YML datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2145YML requirements.
6.How does Aetrix verify that MIC2145YML is sourced from the original manufacturer or authorized distributors?
All MIC2145YML 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 meets industry standards.
7.What is the process for return or replacement of MIC2145YML?
All MIC2145YML units undergo pre-shipment inspection (PSI). If there is an issue with MIC2145YML, 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 part is unused and in its original packaging.
Return procedure for MIC2145YML:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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