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Microchip Technology MIC2287C-34BML-TR
- Part No.:
- MIC2287C-34BML-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 8-VFDFN Exposed Pad, 8-MLF®
- Datasheet:
-
MIC2287C-34BML-TR.pdf
- Description:
- IC LED DRVR RGLTR PWM 750MA 8MLF
- Quantity:
- Payment:
- Shipping:
Inventory:4,678
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Product details
Overview
MIC2287C-34BML-TR from Micrel is a 1.2MHz PWM white LED driver IC optimized for constant-current backlighting of up to six series-connected white LEDs. It features 34V output overvoltage protection (OVP), 95mV feedback reference, 2.5–10V input range, and delivers >500mA switch current in an 8-pin 2mm × 2mm MLF™ package. It is used in portable consumer devices requiring compact, high-efficiency LED biasing with open-circuit protection.
For engineers reviewing the MIC2287C-34BML-TR datasheet, MIC2287C-34BML-TR pinout, MIC2287C-34BML-TR application, or MIC2287C-34BML-TR equivalent, this page provides verified technical context, exact pin functions, real-world dimming implementation details, OVP-level-specific design implications, and validated alternative options for 6-LED boost driver designs.
Technical Context
The MIC2287C-34BML-TR implements a constant-frequency, current-mode PWM boost regulator architecture with internal bipolar switch, slope-compensated current sensing, and gm error amplifier. Its 1.2MHz oscillator enables small external inductors (e.g., 10µH) and ceramic output capacitors (e.g., 0.22µF), reducing board area and input ripple.
OVP is implemented via dedicated OVP pin connected to converter output, triggering shutdown when voltage exceeds 32–37V (typ. 34V). The 95mV FB reference minimizes power loss in current-sense resistor and lowers minimum required output headroom, directly improving battery runtime in single-cell Li-ion systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.2 MHz ±15% - Enables use of 10 µH inductors and 0.22 µF ceramic output capacitors, minimizing PCB footprint. |
| Feedback Voltage | 95 mV ±10% - Sets LED current as ILED = 95 mV / RFB; low value reduces sense-resistor power loss and extends battery life. |
| OVP Threshold | 34 V (27–37 V range) - Clamps output during LED open-circuit fault; matches 6-series white LED string (≈21–24 V nominal) with safety margin. |
| Input Voltage Range | 2.5 V to 10 V - Supports single-cell Li-ion (2.7–4.2 V), Li-polymer, and 3.3 V/5 V rail inputs without external regulation. |
| Switch Current Limit | 750 mA (min) - Sustains >500 mA continuous switch current needed for 20–30 mA per LED across 6-LED string. |
| Junction Temp Range | –40°C to +105°C - Validated for operation in handheld device enclosures under sustained display brightness. |
| Package | 8-pin 2 mm × 2 mm MLF™ with exposed pad - Provides low thermal resistance (θJA = 93°C/W) for power dissipation in space-constrained layouts. |
Pinout & Package
8-pin 2mm × 2mm MLF™ package with exposed thermal pad (EP = GND). Pin 1 marked by vertical bar; Pb-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SW | Internal bipolar switch collector node - connects to inductor and output diode anode; carries high di/dt switching current. |
| 2 | VIN | Main supply input (2.5–10 V) - powers internal circuitry and switch base drive; requires local 1 µF ceramic decoupling. |
| 3 | EN | Active-high enable control - logic high ≥1.5 V enables regulation; low ≤0.4 V disables switching and reduces quiescent current to <1 µA. |
| 4 | GND | Analog ground reference - separate from PGND; must be tied to EP and system ground at single point near IC. |
| 5 | FB | Current-sense feedback input - connected to cathode of LED string via sense resistor; regulates LED current to 95 mV / RFB. |
| 6 | OVP | Dedicated overvoltage monitor input - connected directly to output node; triggers shutdown if voltage exceeds 34 V threshold. |
| 7 | AGND | Analog ground - internal reference ground for FB and OVP comparators; tied externally to GND pin and EP. |
| 8 | PGND | Power ground - return path for switch emitter current; must be low-inductance connection to EP and input capacitor ground. |
| EP | GND | Exposed thermal pad - electrically and thermally connected to internal GND; soldered to PCB copper for heat dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| 34 V OVP level | Matches 6-white-LED strings (≈21–24 V nominal) with 30% margin; prevents SW pin overstress during open-circuit faults. |
| 95 mV feedback reference | Reduces sense-resistor power loss by >50% vs. typical 1.25 V references, extending single-cell Li-ion runtime by ~8–12%. |
| 1.2 MHz fixed-frequency PWM | Enables 10 µH inductors and 0.22 µF ceramic capacitors - cuts passive component volume by ~65% vs. 300 kHz designs. |
| Integrated bipolar switch | Supports >500 mA continuous switch current without external transistor; eliminates gate-drive complexity and layout sensitivity. |
| –40°C to +105°C operation | Validated for full performance in sealed consumer enclosures under peak brightness and ambient temperature extremes. |
Applications
| Cell Phone Backlighting | PDA Display Driver |
|---|---|
Use Scenario: Driving 4–6 white LEDs in portrait-oriented LCD backlight for GSM/UMTS handsets with Li-ion battery supply. IC Role / Device Role / Timing Role: Constant-current boost controller regulating LED string current via FB pin; OVP pin monitors output to prevent damage during LED failure. Use Value: 34 V OVP ensures safe operation with 6-LED string (24 V max) while enabling smallest possible output capacitor (0.22 µF) and inductor (10 µH). | Use Scenario: Powering high-resolution TFT LCD backlight in enterprise PDAs operating across –20°C to +60°C ambient. IC Role / Device Role / Timing Role: High-frequency PWM LED driver with thermal shutdown and UVLO, managing brightness via EN pin PWM dimming at 1–5 kHz. Use Value: 95 mV FB reference minimizes sense-resistor self-heating in confined PDA chassis, maintaining current accuracy over temperature. |
| Digital Camera Flash Support | IP Phone LCD Backlight |
Use Scenario: Providing steady-state backlight current for rear-panel status LCD during camera boot and menu navigation. IC Role / Device Role / Timing Role: Low-noise constant-current source with 1.2 MHz switching - avoids audible coil whine and minimizes RF interference near image sensor. Use Value: Fixed-frequency operation reduces input ripple injection into shared 3.3 V rail, preventing noise coupling into analog camera circuits. | Use Scenario: Driving 3–5 white LEDs for monochrome or color LCD backlight in VoIP desk phones powered from PoE or wall adapter. IC Role / Device Role / Timing Role: Compact LED driver supporting both EN-based PWM dimming and FB-based analog dimming via DAC interface. Use Value: Dual-dimming capability allows smooth brightness control without flicker, meeting office environment visual comfort requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED boost driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1910EEE+T | 30 V OVP, 1.3 MHz switching, 2.6–5.5 V input, uses external MOSFET switch | Requires external high-side N-MOSFET and gate driver; larger BOM and layout area | Choose when higher efficiency (>88%) at 20 mA is critical and board space permits discrete FET layout. |
| TPS61160DRVR | 28 V OVP, 1.2 MHz, integrated 1.5 A MOSFET, 2.7–5.5 V input, I²C programmable current | Supports digital current tuning and fault reporting via I²C; no dedicated OVP pin - relies on internal comparator | Choose when system-level brightness calibration or LED fault logging is required, and 28 V OVP suffices for ≤5-LED strings. |
Compared with MIC2287C-34BML-TR, MAX1910EEE+T offers higher efficiency but demands external power components and lacks integrated OVP, while TPS61160DRVR adds digital control and higher switch current but reduces OVP margin and requires I²C infrastructure - MIC2287C-34BML-TR remains optimal for cost-sensitive, space-constrained 6-LED designs needing robust 34 V fault clamping.
Availability
MIC2287C-34BML-TR is available at Aetrix Electronics and suitable for cell phone backlighting, PDA display drivers, digital camera status LCDs, and IP phone LCD backlights requiring stable component supply and long-term industrial availability.
Supply support for MIC2287C-34BML-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 (acquired by Microchip in 2015) was a U.S.-based analog and mixed-signal IC designer focused on power management, timing, and interface solutions for portable and industrial markets.
The MIC2287C product line was designed specifically for high-efficiency, ultra-compact white LED backlighting in battery-powered consumer electronics - prioritizing low quiescent current, integrated protection, and minimal external component count.
FAQ
What is the exact OVP threshold voltage for MIC2287C-34BML-TR?
The MIC2287C-34BML-TR has a guaranteed OVP threshold of 32 V to 37 V, with typical activation at 34 V. This is factory-trimmed and specified in the Electrical Characteristics table under VOVP for "MIC2287CBML-34 only". The OVP pin must be connected directly to the output node to enable clamping behavior during LED open-circuit faults.
Can MIC2287C-34BML-TR drive more than six white LEDs?
No - MIC2287C-34BML-TR is rated for up to six white LEDs in series, based on its 34 V OVP limit and maximum output voltage of 37 V. Driving seven or more LEDs would exceed safe operating voltage margins and risk OVP-induced shutdown or switch overstress; the datasheet explicitly states "up to 6 white LEDs" in General Description and Application sections.
How does the 95 mV feedback voltage affect LED current accuracy in MIC2287C-34BML-TR?
The 95 mV feedback voltage in MIC2287C-34BML-TR sets LED current as ILED = 95 mV / RFB. Its ±10% tolerance (85–105 mV) directly translates to ±10% LED current variation at room temperature; however, the datasheet confirms <0.5% load regulation and <0.5% line regulation, meaning current stability remains high across input voltage and load changes despite reference tolerance.
Is MIC2287C-34BML-TR compatible with PWM dimming, and what frequency range is supported?
Yes - MIC2287C-34BML-TR supports PWM dimming via its EN pin, with recommended frequencies between 100 Hz and 10 kHz. At 1 kHz, it achieves smooth brightness control without visible flicker; the IC fully enables/disables within microseconds, ensuring accurate duty-cycle tracking and zero current during off periods for maximum efficiency.
What thermal considerations apply to MIC2287C-34BML-TR in the 2mm × 2mm MLF™ package?
MIC2287C-34BML-TR has θJA = 93°C/W in the 2mm × 2mm MLF™ package. With typical 0.5 W power dissipation (e.g., 3.6 V input, 25 mA × 6 LEDs), junction rise is ~46°C above ambient - well within the –40°C to +105°C rating. Proper soldering of the EP pad to ≥1 cm² copper pour is essential to maintain this thermal performance.
MIC2287C-34BML-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad, 8-MLF®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.5V
- Voltage - Supply (Max):
- 10V
- Voltage - Output:
- -
- Current - Output / Channel:
- 750mA (Switch)
- Frequency:
- 1.2MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 105°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MLF® (2x2)
MIC2287C-34BML-TR FAQ
1.How can I place an order for MIC2287C-34BML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2287C-34BML-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 MIC2287C-34BML-TR reliable?
The price and inventory of MIC2287C-34BML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2287C-34BML-TR is usually 5 days.
3.What payment methods are accepted for MIC2287C-34BML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2287C-34BML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2287C-34BML-TR?
MIC2287C-34BML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2287C-34BML-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 MIC2287C-34BML-TR?
For technical support, including MIC2287C-34BML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2287C-34BML-TR requirements.
6.How does Aetrix verify that MIC2287C-34BML-TR is sourced from the original manufacturer or authorized distributors?
All MIC2287C-34BML-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 MIC2287C-34BML-TR meets industry standards.
7.What is the process for return or replacement of MIC2287C-34BML-TR?
All MIC2287C-34BML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2287C-34BML-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 MIC2287C-34BML-TR part is unused and in its original packaging.
Return procedure for MIC2287C-34BML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC2287C-34BML-TR Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
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BCR421UW6-7
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
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