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Microchip Technology MIC3287-24YML-TR
- Part No.:
- MIC3287-24YML-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 8-VFDFN Exposed Pad, 8-MLF®
- Datasheet:
-
MIC3287-24YML-TR.pdf
- Description:
- IC LED DRVR RGLTR PWM 350MA 8MLF
- Quantity:
- Payment:
- Shipping:
Inventory:3,565
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Product details
Overview
MIC3287-24YML-TR from Micrel is a 1.2MHz PWM white LED driver IC optimized for constant-current backlighting of 3–4 series white LEDs, featuring 24V over-voltage protection (OVP), 250mV feedback voltage, and 350mA switch current. It operates from 2.8V to 6.5V input and delivers up to 36V output without OVP-used in compact portable displays requiring uniform LED brightness and minimal board space.
For engineers reviewing the MIC3287-24YML-TR datasheet, MIC3287-24YML-TR pinout, MIC3287-24YML-TR application, or MIC3287-24YML-TR equivalent, key selection criteria include OVP threshold accuracy, thermal performance in 2mm × 2mm MLF®, shutdown current (<1µA), and compatibility with Li-ion single-cell sources in space-constrained handheld devices.
Technical Context
The MIC3287-24YML-TR implements constant-frequency current-mode PWM control at 1.2MHz using an internal bipolar switch and slope-compensated current loop. Its gm error amplifier compares FB voltage against a 250mV reference to regulate LED current via external sense resistor.
OVP functionality is active only in TSOT-23-6 and 8-pin MLF™ packages-here, the OVP pin monitors output voltage and clamps switching when VOVP exceeds 17–24V (typical 19V). The device integrates UVLO (2.1V typ), over-temperature shutdown (150°C), and <1µA shutdown current with EN logic control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.2 MHz ±0.2 MHz - enables use of small 10 µH inductors and 0.22 µF output capacitors to minimize PCB area. |
| Feedback Voltage | 250 mV ±7.5% - sets LED current as ILED = 250 mV / RFB; low value reduces power loss in sense resistor. |
| OVP Threshold | 19 V typical (17–24 V range) - protects SW node and external components during open-circuit LED failure. |
| Switch Current Limit | 350 mA min - supports driving up to four 20 mA white LEDs in series with margin. |
| Input Voltage Range | 2.8 V to 6.5 V - matches single-cell Li-ion (3.0–4.2 V) and Li-polymer battery operation with headroom. |
| Shutdown Current | 0.04 µA to 1 µA - ensures ultra-low system standby power when EN = 0 V. |
| Junction Temp Range | –40°C to +125°C - validated for industrial and automotive cabin-adjacent portable electronics. |
Pinout & Package
Package: 8-pin 2mm × 2mm MLF® (exposed pad), RoHS-compliant, θJA = 90°C/W on 4-layer PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Supply Input | 2.8–6.5 V DC input for internal circuitry and switch bias; requires local 1 µF ceramic decoupling. |
| 2 OVP | OVP Sense Input | Connects directly to regulated output; triggers shutdown if voltage exceeds 19 V (typical). |
| 3 EN | Enable Control | Logic-high (>1.5 V) enables regulation; logic-low (<0.4 V) disables switch and reduces IIN to <1 µA. |
| 4 AGND | Analog Ground | Reference return for FB and error amplifier; must be routed separately from PGND to avoid noise coupling. |
| 5 PGND | Power Ground | High-current return path for switch and inductor; connects to exposed pad for thermal conduction. |
| 6 SW | Switch Node | Collector of internal bipolar transistor; drives external inductor; requires tight layout to minimize EMI. |
| 7 FB | Current Sense Input | Connects to LED cathode via sense resistor; regulates LED current to 250 mV / RFB. |
| 8 NC | No Connect | Not internally bonded; must remain unconnected and un-routed. |
| EP (Exposed Pad) | Thermal & Electrical Ground | Must be soldered to large copper pour tied to PGND for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| 1.2 MHz fixed-frequency PWM | Enables miniaturized magnetics (e.g., 10 µH) and low-ESR ceramic output caps-reducing solution size by >40% vs. 500 kHz designs. |
| 250 mV feedback reference | Lowers power dissipation in current-sense resistor by 4× compared to 1 V references-critical for thermally constrained handhelds. |
| Integrated 24 V OVP | Prevents destructive overvoltage during LED string open-circuit faults without external Zener or comparator circuitry. |
| UVLO and thermal shutdown | Ensures safe startup above 2.1 V and automatic recovery after junction cools below 140°C hysteresis. |
| Sub-1 µA shutdown current | Extends battery life in always-on display systems (e.g., GPS, IP phones) during sleep mode. |
Applications
| Cell Phone Backlighting | PDA Display Illumination |
|---|---|
|
Use Scenario: Driving 4-series white LEDs in QVGA LCD backlight of slim mobile handsets powered by single-cell Li-ion. IC Role / Device Role / Timing Role: Constant-current step-up regulator with OVP, providing stable 20 mA per LED across battery discharge (4.2 V → 3.0 V). Use Value: Eliminates ballast resistors and ensures uniform brightness without color shift, while OVP prevents SW node overstress during LED disconnection. |
Use Scenario: Powering high-brightness WLED array in ruggedized PDA with wide ambient temperature range (–20°C to +60°C). IC Role / Device Role / Timing Role: PWM-controlled LED driver with –40°C to +125°C junction rating and 1.2 MHz switching for compact filter design. Use Value: Maintains consistent luminance across temperature via stable 250 mV FB reference and <1% load regulation-no brightness drift during field use. |
| Digital Camera Flash Support | IP Phone Keypad/Display Lighting |
|
Use Scenario: Supplemental LED flash illumination in compact digital cameras where burst-mode current demand peaks at 100 mA. IC Role / Device Role / Timing Role: High-efficiency boost converter with PWM dimming via EN pin, supporting 1–10 kHz modulation for flicker-free capture. Use Value: Achieves >75% efficiency at 100 mA output (VIN = 3.6 V) and shuts down fully between bursts to conserve battery. |
Use Scenario: Low-power keypad and status LED backlighting in VoIP desk phones operating continuously from PoE or wall adapter. IC Role / Device Role / Timing Role: Always-on constant-current source with <1 µA shutdown current and robust OVP for long-term reliability. Use Value: Reduces standby power consumption by >95% versus linear drivers-enabling Class 2 PoE compliance and silent thermal operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1910ETE+ | 2.5 MHz switching, 300 mA switch current, no integrated OVP; requires external OVP circuit for 24 V clamp. | Limited to ≤3-series LEDs at full current due to lower switch rating; better suited for ultra-thin camera modules needing higher fSW. | Select when board space is more constrained than fault protection requirements-and external OVP is acceptable. |
| TPS61160DRVR | 1.2 MHz, 400 mA switch current, 27 V OVP (fixed), 200 mV FB reference; uses CMOS FET instead of bipolar. | Higher efficiency at light loads due to CMOS architecture; supports wider input (2.7–6 V); OVP not adjustable. | Choose for improved light-load efficiency and tighter OVP tolerance (±2%), but verify thermal performance in MLF footprint. |
Compared with MAX1910ETE+ and TPS61160DRVR, the MIC3287-24YML-TR provides factory-trimmed 24 V OVP with no external components, bipolar switch robustness for surge immunity, and proven thermal performance in 2mm × 2mm MLF®-making it optimal for cost-sensitive, reliability-critical portable backlighting.
Availability
MIC3287-24YML-TR is available at Aetrix Electronics and suitable for cell phone backlighting, PDA display illumination, and IP phone LED lighting requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MIC3287-24YML-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-reliability power management and timing solutions.
The MIC3287 product line was designed specifically for space-constrained portable backlighting applications requiring integrated OVP, low quiescent current, and stable current regulation across battery voltage ranges.
FAQ
What is the exact over-voltage protection threshold of the MIC3287-24YML-TR?
The MIC3287-24YML-TR has a guaranteed OVP threshold of 17 V minimum and 24 V maximum, with 19 V typical at TJ = 25°C. This specification is validated per the Electrical Characteristics table in the official Micrel datasheet revision April 2010, and applies only when the OVP pin is correctly connected to the output node.
Can the MIC3287-24YML-TR drive more than four white LEDs in series?
No-the MIC3287-24YML-TR is characterized to drive up to four standard white LEDs (VF ≈ 3.2 V each) at 20 mA, yielding ~12.8 V output; its 24 V OVP limit and 350 mA switch current constrain practical operation to ≤4 LEDs. Attempting five LEDs risks OVP triggering or insufficient headroom under low VIN conditions.
Does the MIC3287-24YML-TR require an external Schottky diode?
No-the MIC3287-24YML-TR integrates a bipolar transistor switch and does not require an external flyback diode. Its functional diagram and application schematics confirm inductor-to-SW-to-output topology with no diode path; external components are limited to inductor, output capacitor, and FB sense resistor.
How is LED dimming implemented on the MIC3287-24YML-TR?
The MIC3287-24YML-TR supports two dimming methods: (1) PWM dimming via the EN pin (100 Hz–10 kHz), turning the entire regulator on/off; and (2) continuous dimming via DC voltage injection into the FB pin through a series resistor, enabling analog intensity control without flicker.
What is the thermal resistance (θJA) of the MIC3287-24YML-TR in its MLF package?
The MIC3287-24YML-TR has a junction-to-ambient thermal resistance (θJA) of 90°C/W when mounted on a standard 4-layer PCB with the exposed pad fully soldered to a thermal plane. This value assumes 1 in² copper area per layer and is specified in the Absolute Maximum Ratings section of the datasheet.
MIC3287-24YML-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad, 8-MLF®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.8V
- Voltage - Supply (Max):
- 6.5V
- Voltage - Output:
- 36V
- Current - Output / Channel:
- 350mA (Switch)
- Frequency:
- 1.2MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MLF® (2x2)
MIC3287-24YML-TR FAQ
1.How can I place an order for MIC3287-24YML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC3287-24YML-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 MIC3287-24YML-TR reliable?
The price and inventory of MIC3287-24YML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC3287-24YML-TR is usually 5 days.
3.What payment methods are accepted for MIC3287-24YML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC3287-24YML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC3287-24YML-TR?
MIC3287-24YML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC3287-24YML-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 MIC3287-24YML-TR?
For technical support, including MIC3287-24YML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC3287-24YML-TR requirements.
6.How does Aetrix verify that MIC3287-24YML-TR is sourced from the original manufacturer or authorized distributors?
All MIC3287-24YML-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 MIC3287-24YML-TR meets industry standards.
7.What is the process for return or replacement of MIC3287-24YML-TR?
All MIC3287-24YML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC3287-24YML-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 MIC3287-24YML-TR part is unused and in its original packaging.
Return procedure for MIC3287-24YML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC3287-24YML-TR Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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