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Microchip Technology MIC2145BMM-TR
- Part No.:
- MIC2145BMM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MIC2145BMM-TR.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,255
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Product details
Overview
MIC2145BMM-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. The device is used in portable white LED drivers and LCD bias supplies requiring compact DC-DC conversion.
For engineers reviewing the MIC2145BMM-TR datasheet, MIC2145BMM-TR pinout, MIC2145BMM-TR application, or MIC2145BMM-TR equivalent, key selection criteria include adjustable output up to 16V, external RSET-based peak current programming, soft-start control via capacitor, MSOP-8 package thermal performance (θJA = 206°C/W), and feedback reference voltage of 1.08V ±2%.
Technical Context
The MIC2145BMM-TR implements a constant-off-time, current-mode boost controller with dual comparator regulation: one for peak inductor current (set by RSET) and one for output voltage (via FB pin with 1.08V reference). Its internal 250–750mΩ 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) efficiency, while basic mode favors light-load operation. 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 (3.0–4.2V) and 3–4-cell alkaline/NiMH (4.5–6.0V) inputs. |
| Output Voltage Range | Adjustable up to 16V - set via external resistor divider on FB pin; limited by internal switch voltage rating. |
| Peak Switch Current | Programmable 0.42A–2A via RSET - enables optimization of inductor size and efficiency at specific load points. |
| Switching Frequency | Up to 450kHz - allows use of small 4.7µH or 10µH surface-mount inductors in space-constrained designs. |
| Quiescent Current | 200µA typical - minimizes battery drain during active operation in portable systems. |
| Shutdown Current | 0.5µA typical - ensures ultra-low leakage during system sleep or standby modes. |
| Feedback Reference | 1.08V ±2% - defines output voltage accuracy; hysteresis of 18mV reduces output ripple without feed-forward capacitor. |
| Package | 8-pin MSOP (MIC2145BMM-TR) - 3mm × 3mm footprint with exposed pad option; θJA = 206°C/W. |
Pinout & Package
Package: 8-pin MSOP (MM), 3mm × 3mm body, 0.65mm pitch, exposed thermal pad (not electrically connected in standard version).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable input | Logic-high ≥1.5V enables regulation; ≤0.7V disables with 0.5µA shutdown current - must not be left floating. |
| 2 - SS | Soft-start capacitor node | Connect external capacitor to ground to control output voltage ramp rate and limit inrush current during startup. |
| 3 - RSET | Peak current limit programming | External resistor sets peak switch current (0.42–2A); lower RSET increases current limit and inductor stress. |
| 4 - PGND | Power ground return | High-current return path for internal MOSFET source - requires low-inductance PCB connection to minimize noise and losses. |
| 5 - SW | Switch node | Drain of internal MOSFET - connects to inductor and catch diode; high dv/dt node requiring careful layout and grounding. |
| 6 - VDD | Supply input | +2.4V to +16V input for internal circuitry - in bootstrap configuration, tied to VOUT for improved heavy-load efficiency. |
| 7 - FB | Feedback input | Senses output voltage via resistor divider; 1.08V reference sets regulation point - high-impedance (40nA input current) node. |
| 8 - SGND | Small-signal ground | Analog ground reference for FB, EN, SS, RSET - must be separated from PGND and joined at single point near IC. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable peak current limit | Enables precise matching of inductor saturation current and load requirements - avoids overdesign and improves efficiency. |
| Integrated 250–750mΩ MOSFET switch | Eliminates external high-side switch - reduces BOM count and layout area while maintaining >85% efficiency at 100mA output. |
| Soft-start with external capacitor control | Prevents output overshoot and limits inrush into output capacitors - critical for driving capacitive loads like LCD bias rails. |
| Constant off-time current-mode control | Provides inherent cycle-by-cycle current limiting and stable regulation across wide input/output ratios - no compensation network required. |
| Thermal shutdown protection | Disables switching when junction temperature exceeds ~150°C - prevents damage during overload or poor heatsinking conditions. |
Applications
| Flash LED driver | LCD bias supply |
|---|---|
Use Scenario: Driving high-brightness flash LEDs in smartphone or camera modules requiring 5–10V at 500mA peak from 3.3V battery input. IC Role / Device Role / Timing Role: Boost converter providing regulated high-voltage, high-current pulses synchronized to camera shutter timing. Use Value: Delivers 2.5W output with >85% efficiency and programmable peak current to match LED forward voltage and pulse duration. | Use Scenario: Generating 10–15V bias rails for TFT-LCD panel gate drivers and source drivers in portable displays. IC Role / Device Role / Timing Role: Adjustable-output boost regulator supplying stable high-voltage rail with low output ripple (<100mVpp) under dynamic load. Use Value: Achieves 80–90% efficiency at 100mA load using 10µH inductor and supports feed-forward capacitor to reduce ripple below 50mVpp. |
| White LED driver | DSL line bias supply |
Use Scenario: Powering 1–10 parallel white LEDs (3.2–3.6V each) from 3.0–5.0V input in backlight or indicator applications. IC Role / Device Role / Timing Role: Constant-voltage boost controller regulating LED string voltage; soft-start prevents current surge during turn-on. Use Value: Supports RSET-based current limiting to avoid LED overcurrent; 200µA quiescent current extends battery life in always-on indicators. | Use Scenario: Providing isolated 12–16V bias for DSL line driver amplifiers in customer-premises equipment (CPE) powered from 5V or 12V rails. IC Role / Device Role / Timing Role: High-voltage boost stage generating clean, stable bias voltage independent of main system rail fluctuations. Use Value: Withstands 16V output swing and maintains <1% line/load regulation - verified in Figure 13 for 10V output at 100mA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Higher 2.2MHz switching frequency; integrated 13mΩ FET; fixed 500kHz/2.2MHz option; 10V max output (non-adjustable beyond) | Optimized for ultra-compact layouts with ceramic inductors <1µH; less suitable for >10V outputs or discrete RSET tuning | Select TPS61088RHLR when board space is critical and output ≤10V; MIC2145BMM-TR preferred for 12–16V outputs and fine current limit adjustment. |
| LT3467EDD-TR | Fixed 1.3MHz frequency; 2A switch; 1.25V FB reference; no RSET pin - uses internal current sense; smaller 10-lead DFN | Better suited for fixed-output, high-frequency, low-ripple applications; lacks programmable peak current and soft-start capacitor control | Choose LT3467EDD-TR for simpler design with minimal external components; MIC2145BMM-TR offers superior flexibility in current limit tuning and startup behavior. |
Compared with TPS61088RHLR and LT3467EDD-TR, the MIC2145BMM-TR provides unique RSET-based peak current programming and soft-start capacitor control - enabling precise inductor sizing, reduced EMI, and robust startup into capacitive loads, especially where output voltages exceed 10V.
Availability
MIC2145BMM-TR is available at Aetrix Electronics and suitable for flash LED drivers, LCD bias supplies, and DSL line bias applications requiring stable component supply and long-term industrial availability.
Supply support for MIC2145BMM-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 power management, interface, and timing solutions.
The MIC2145 product line was designed for space-constrained, battery-powered DC-DC conversion - targeting portable consumer electronics needing high-efficiency, adjustable-output boost capability with minimal external components.
FAQ
What is the maximum output voltage supported by the MIC2145BMM-TR?
The MIC2145BMM-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 with a 1.08V reference. Outputs above 16V require flyback topology reconfiguration - the MIC2145BMM-TR itself does not support >16V in standard boost mode.
How is peak switch current programmed on the MIC2145BMM-TR?
Peak switch current on the MIC2145BMM-TR is programmed via an external resistor (RSET) connected between the RSET pin and ground. Values from 200Ω to 10kΩ set peak current from 0.8A to 0.42A (at VDD = 3.6V); higher VDD yields slightly higher current for same RSET. The relationship is shown in Figure 15 of the datasheet.
Does the MIC2145BMM-TR require an external Schottky diode?
Yes, the MIC2145BMM-TR requires an external Schottky diode (e.g., MBR0530T1) in the boost path. Its internal MOSFET is a single N-channel switch; the diode provides the freewheeling path during switch-off. Using a low-VF Schottky minimizes conduction loss and preserves efficiency - standard PN diodes like 1N4148 degrade efficiency significantly.
What is the purpose of the SS (soft-start) pin on the MIC2145BMM-TR?
The SS pin on the MIC2145BMM-TR controls output voltage rise time and peak current limit threshold during startup. An external capacitor to ground sets the soft-start duration - larger values increase ramp time and reduce inrush current. Shorting SS to ground halves the peak current limit, useful for reducing stress during initial power-up.
Can the MIC2145BMM-TR operate with input voltage below 2.4V?
No, the MIC2145BMM-TR has a minimum specified input voltage of 2.4V per Absolute Maximum Ratings and Operating Ratings. Operation below this level is not guaranteed and may result in failure to start, unstable regulation, or undefined behavior. For sub-2.4V inputs, alternative regulators such as the MIC2280 or TPS61200 should be evaluated.
MIC2145BMM-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- 8-MSOP
MIC2145BMM-TR FAQ
1.How can I place an order for MIC2145BMM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2145BMM-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 MIC2145BMM-TR reliable?
The price and inventory of MIC2145BMM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2145BMM-TR is usually 5 days.
3.What payment methods are accepted for MIC2145BMM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2145BMM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2145BMM-TR?
MIC2145BMM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2145BMM-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 MIC2145BMM-TR?
For technical support, including MIC2145BMM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2145BMM-TR requirements.
6.How does Aetrix verify that MIC2145BMM-TR is sourced from the original manufacturer or authorized distributors?
All MIC2145BMM-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 MIC2145BMM-TR meets industry standards.
7.What is the process for return or replacement of MIC2145BMM-TR?
All MIC2145BMM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2145BMM-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 MIC2145BMM-TR part is unused and in its original packaging.
Return procedure for MIC2145BMM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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