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Microchip Technology MIC2287CBD5-TR
- Part No.:
- MIC2287CBD5-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MIC2287CBD5-TR.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,774
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Product details
Overview
MIC2287CBD5-TR from Micrel is a 1.2MHz PWM white LED driver IC optimized for constant-current backlighting in portable devices. It operates from 2.5V to 10V input, delivers up to 34V output, supports >500mA switch current, features 95mV feedback voltage, and integrates overvoltage protection (OVP) - enabling reliable 3-series white LED driving in thin SOT-23-5 packaging.
For engineers reviewing the MIC2287CBD5-TR datasheet, MIC2287CBD5-TR pinout, MIC2287CBD5-TR application, or MIC2287CBD5-TR equivalent, key selection criteria include its fixed-frequency boost topology, OVP implementation via external Zener, thermal shutdown behavior, and compatibility with PWM/DC dimming schemes in space-constrained handheld designs.
Technical Context
The MIC2287CBD5-TR implements a constant-frequency, current-mode PWM control architecture with a 1.2MHz oscillator, slope compensation ramp generator, and bipolar 500mA output transistor. Its gm error amplifier compares FB voltage against a 95mV internal reference to regulate LED current via external sense resistor.
Unlike MLF-packaged variants, the MIC2287CBD5-TR lacks a dedicated OVP pin; open-circuit protection requires an external Zener diode from SW to FB. It includes UVLO (2.1V typ), thermal shutdown at 150°C, and operates across –40°C to +105°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 10V - supports single-cell Li-ion (3.0–4.2V) and multi-cell alkaline/NiMH inputs without external regulation. |
| Switching Frequency | 1.2MHz (typ) - enables use of small 10µH inductors and 0.22µF output capacitors, reducing PCB footprint. |
| Feedback Voltage | 95mV (±10%) - minimizes power loss in current-sense resistor and lowers minimum required output headroom. |
| Max Switch Current | 750mA (min) - sustains >500mA continuous conduction for driving 3-series white LEDs at ~20mA each. |
| OVP Implementation | External Zener-based - requires discrete 15V/24V/34V Zener from SW to FB; no internal OVP comparator or dedicated pin. |
| Junction Temp Range | –40°C to +105°C - validated for operation in consumer handheld enclosures under sustained brightness loads. |
| Quiescent Current | 2.5mA (typ) - ensures low battery drain during active LED operation without compromising regulation accuracy. |
Pinout & Package
Package: Thin SOT-23-5 (BD5), 2.9mm × 1.6mm × 1.0mm profile, Pb-free standard finish, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch node | Internal bipolar collector output - connects to inductor and Schottky diode anode; handles peak currents up to 2A (abs max). |
| 2 (GND) | Ground return | Common reference for power and control circuitry - must be low-impedance connection to minimize noise coupling into FB path. |
| 3 (FB) | Feedback input | Senses LED current via external resistor to GND; 95mV threshold sets ILED = 95mV / RFB; also accepts DC dimming voltage or Zener clamp for OVP. |
| 4 (EN) | Enable control | Active-high logic input - drives internal bias circuits; 1.5V threshold enables, 0.4V disables; supports PWM dimming at 100Hz–10kHz. |
| 5 (VIN) | Supply input | Power for internal circuitry - accepts 2.5–10V; includes UVLO (2.1V typ) and draws 2.5mA quiescent current when enabled. |
Key Features
| Feature | Design Value |
|---|---|
| 1.2MHz fixed-frequency PWM | Enables compact LC filter design (e.g., 10µH + 0.22µF) while minimizing conducted EMI vs. variable-frequency alternatives. |
| 95mV feedback reference | Reduces sense-resistor power dissipation by >50% versus 200mV references, extending battery life in portable applications. |
| Thermal shutdown with hysteresis | Shuts down at 150°C (±10°C) and restarts at 140°C - prevents latch-up during transient overloads in sealed enclosures. |
| UVLO with 2.1V threshold | Prevents erratic startup below battery cutoff voltage, ensuring clean enable/disable sequencing during low-battery conditions. |
| Low-profile SOT-23-5 package | 1.0mm max height allows integration beneath display modules in ultra-thin smartphones and PDAs. |
Applications
| Cell Phone Backlighting | PDA Display Illumination |
|---|---|
Use Scenario: Driving 3-series white LEDs behind TFT LCD in GSM/3G handsets with single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Constant-current boost regulator providing stable 20mA per LED string with PWM dimming synchronized to display frame rate. Use Value: Eliminates ballast resistors, reduces board area by 40% vs. linear drivers, and maintains uniform brightness across battery discharge cycle. | Use Scenario: Powering dual 3-LED strings for front/rear displays in enterprise PDAs operating from replaceable AA/AAA batteries. IC Role / Device Role / Timing Role: High-efficiency current source with DC dimming interface for adaptive brightness control via microcontroller DAC output. Use Value: Achieves >82% efficiency at 3.6V input/12V output, extending alkaline battery life to >15 hours at full brightness. |
| Digital Camera LCD Backlight | IP Phone Keypad Illumination |
Use Scenario: Supplying 3-white-LED array for 2.4" color LCD in compact digital cameras powered by 3.7V Li-Poly battery. IC Role / Device Role / Timing Role: Fast-response current driver supporting strobe-level brightness bursts during photo capture preview mode. Use Value: Delivers 34V output capability to maintain LED current during cold-start (–10°C), preventing display flicker in outdoor environments. | Use Scenario: Illuminating membrane keypad LEDs in VoIP desk phones using 5V USB-derived rail with minimal heat generation. IC Role / Device Role / Timing Role: Low-quiescent-current (2.5mA) LED driver enabling always-on status lighting without impacting standby power budget. Use Value: Reduces system standby current by 1.8mA versus LDO-based solutions, meeting Energy Star Level V requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1910EUT+T | 2.5–5.5V input range; no integrated OVP; requires external Zener like MIC2287CBD5-TR; 1.2MHz switching. | Optimized for 2–4 LED strings only; lower max output voltage (28V); less suitable for 34V-capable 6-LED configurations. | Select when input is strictly 3.3V/5V-rail derived and board space permits larger external components for OVP. |
| TPS61160DRVR | 2.7–6.5V input; integrated 34V OVP pin; 1.2MHz switching; 1.2A switch current; smaller 6-pin WSON package. | Supports direct OVP without external Zener; higher switch current enables 4–5 LED strings; wider VIN range than MAX1910 but narrower than MIC2287CBD5-TR. | Choose when eliminating external OVP components is critical and thermal performance above 105°C is not required. |
Compared with MAX1910EUT+T and TPS61160DRVR, the MIC2287CBD5-TR offers broader input voltage support (2.5–10V), verified operation to +105°C, and Micrel's proven bipolar switch reliability in high-volume portable designs - making it optimal for cost-sensitive, thermally demanding single-cell Li-ion applications where external OVP is acceptable.
Availability
MIC2287CBD5-TR is available at Aetrix Electronics and suitable for cell phone backlighting, PDA display illumination, digital camera LCD backlights, IP phone keypad lighting, and portable medical device indicators requiring stable component supply and long-term lifecycle continuity.
Supply support for MIC2287CBD5-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 specializing in power management, timing, and interface solutions for portable and industrial markets.
The MIC2287C family was engineered specifically for high-efficiency, space-constrained white LED backlighting in battery-powered consumer electronics - emphasizing thermal robustness, low quiescent current, and simplified external component count.
FAQ
What is the maximum number of white LEDs the MIC2287CBD5-TR can drive in series?
The MIC2287CBD5-TR supports up to 3-series white LEDs in standard configurations, delivering up to 34V output. While the base MIC2287C family can drive 6-series LEDs in MLF-packaged variants with internal OVP, the MIC2287CBD5-TR's 34V output limit and external Zener-based OVP make 3-LED strings the reliably supported configuration. Driving 4+ LEDs risks exceeding safe SW pin voltage ratings without precise external clamping.
Does the MIC2287CBD5-TR have built-in overvoltage protection?
No, the MIC2287CBD5-TR does not include internal overvoltage protection. As a Thin SOT-23-5 variant, it lacks the dedicated OVP pin found in 8-lead MLF versions (e.g., MIC2287C-34BML). OVP must be implemented externally using a Zener diode connected between the SW and FB pins, sized to clamp at the desired threshold (e.g., 15V, 24V, or 34V).
What dimming methods are supported by the MIC2287CBD5-TR?
The MIC2287CBD5-TR supports two dimming methods: (1) PWM dimming via the EN pin (100Hz–10kHz range), which toggles the IC on/off to control average LED current; and (2) analog dimming by injecting a DC voltage into the FB pin through a series resistor, allowing continuous brightness adjustment using a DAC or filtered PWM signal.
What is the purpose of the 95mV feedback voltage in the MIC2287CBD5-TR?
The 95mV feedback voltage in the MIC2287CBD5-TR sets the LED current via ILED = 95mV / RFB. This low reference reduces power dissipation in the external current-sense resistor by over 50% compared to typical 200mV references, improving efficiency and thermal performance - especially critical in compact, battery-powered devices where heat buildup must be minimized.
Can the MIC2287CBD5-TR operate from a 1.5V alkaline battery?
No, the MIC2287CBD5-TR cannot operate directly from a 1.5V alkaline battery. Its minimum input voltage is 2.5V (per Absolute Maximum Ratings and Electrical Characteristics), and UVLO activates below 2.1V. It is designed for single-cell Li-ion (3.0–4.2V), Li-Poly, or multi-cell alkaline/NiMH sources - not single primary cells.
MIC2287CBD5-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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:
- TSOT-23-5
MIC2287CBD5-TR FAQ
1.How can I place an order for MIC2287CBD5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2287CBD5-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 MIC2287CBD5-TR reliable?
The price and inventory of MIC2287CBD5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2287CBD5-TR is usually 5 days.
3.What payment methods are accepted for MIC2287CBD5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2287CBD5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2287CBD5-TR?
MIC2287CBD5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2287CBD5-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 MIC2287CBD5-TR?
For technical support, including MIC2287CBD5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2287CBD5-TR requirements.
6.How does Aetrix verify that MIC2287CBD5-TR is sourced from the original manufacturer or authorized distributors?
All MIC2287CBD5-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 MIC2287CBD5-TR meets industry standards.
7.What is the process for return or replacement of MIC2287CBD5-TR?
All MIC2287CBD5-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2287CBD5-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 MIC2287CBD5-TR part is unused and in its original packaging.
Return procedure for MIC2287CBD5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC2287CBD5-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
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LYT1604D-TL
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
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BCR421UFD-7
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