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Microchip Technology MIC3287YD5-TR
- Part No.:
- MIC3287YD5-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MIC3287YD5-TR.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,834
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Product details
Overview
MIC3287YD5-TR from Micrel is a 1.2MHz PWM white LED driver IC in Thin SOT-23-5 package, delivering up to 350mA switch current, 250mV feedback voltage, and 2.8–6.5V input range. It drives up to 3-series white LEDs for backlighting in portable Li-ion-powered devices with uniform current regulation and minimal external components.
For engineers reviewing the MIC3287YD5-TR datasheet, MIC3287YD5-TR pinout, MIC3287YD5-TR application, or MIC3287YD5-TR equivalent, key selection criteria include OVP absence (vs. YD6/YML variants), 5-pin thermal limitations, PWM dimming via EN pin, and 250mV FB-based current setting for precision LED brightness control.
Technical Context
The MIC3287YD5-TR implements constant-frequency current-mode PWM control at 1.2MHz using an internal bipolar transistor and slope-compensated current loop. Its gm error amplifier compares FB voltage against a 250mV reference to regulate LED current, while the oscillator synchronizes switching and ramp reset.
No over-voltage protection (OVP) circuitry is integrated - unlike MIC3287-24YD6 or MIC3287-24YML - making external clamping essential for >36V output scenarios. UVLO triggers at 2.1V typical, and shutdown draws <1µA when EN is low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current | 350mA max - supports driving 3-series white LEDs at ~20mA each with margin. |
| Feedback Voltage | 250mV ±7.5% - sets LED current precisely via external RFB: ILED = 250mV / RFB. |
| Input Voltage Range | 2.8V to 6.5V - compatible with single-cell Li-ion (3.0–4.2V) and regulated 3.3V/5V rails. |
| Oscillator Frequency | 1.2MHz typical - enables use of small 10µH inductors and 0.22µF output capacitors. |
| Shutdown Current | <1µA - minimizes battery drain during display-off states in portable systems. |
| Junction Temp Range | –40°C to +125°C - qualified for industrial and automotive cabin-temperature environments. |
| Line/Load Regulation | <1% - ensures stable LED current despite input voltage shifts or load variations. |
Pinout & Package
Package: Thin SOT-23-5 (YD5), 1.3mm height, lead-free, with exposed pad not present (unlike MLF variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Power Input | Supplies internal circuitry; accepts 2.8–6.5V; must be decoupled near pin. |
| 2 - EN | Digital Enable | Logic-high (>1.5V) enables regulation; logic-low (<0.4V) disables switching and reduces IIN to <1µA. |
| 3 - SW | Switch Node | Collector of internal bipolar transistor; connects to inductor and output rectifier; swings up to 36V. |
| 4 - FB | Current Sense Input | Connects to LED cathode via sense resistor; regulates current by holding voltage at 250mV. |
| 5 - GND | Analog Ground | Common return for FB, EN, and internal bias; requires low-impedance PCB connection. |
Key Features
| Feature | Design Value |
|---|---|
| 1.2MHz fixed-frequency PWM | Enables compact 10µH inductors and 0.22µF ceramic output caps - reducing board area vs. lower-frequency drivers. |
| 250mV feedback reference | Lowers power loss in current-sense resistor by 4× vs. 1V references - critical for efficiency in battery-powered LED strings. |
| 350mA switch current rating | Supports full-brightness operation of 3-white-LED strings (e.g., 3 × 3.2V ≈ 9.6V out) from 3.6V input with >75% efficiency. |
| UVLO and thermal shutdown | Prevents malfunction during brown-out (UVLO trips at ~2.1V) and protects die at 150°C with 10°C hysteresis. |
| Low-profile TSOT-23-5 | 0.95mm max height allows integration into ultra-thin handheld displays without mechanical interference. |
Applications
| Cell Phone Backlighting | PDA Display Illumination |
|---|---|
Use Scenario: Driving 3-series white LEDs in QVGA–WQVGA LCD backlights powered by single-cell Li-ion batteries (3.0–4.2V). IC Role / Device Role / Timing Role: Constant-current step-up regulator with PWM dimming control via EN pin for brightness adjustment. Use Value: Delivers uniform LED brightness without ballast resistors while maintaining >75% efficiency across battery discharge cycle. | Use Scenario: Powering monochrome or color STN/TFT LCD backlights in legacy PDAs with tight board height constraints. IC Role / Device Role / Timing Role: Compact white LED driver with 1.2MHz switching to minimize EMI in proximity to RF sections and touch controllers. Use Value: Enables use of 10µH inductors and 0.22µF ceramics - reducing solution footprint by >40% vs. 300kHz alternatives. |
| Digital Camera LCD Viewfinder | IP Phone Keypad/Display Lighting |
Use Scenario: Illuminating small-format LCD viewfinders requiring flicker-free, high-CRI white light with rapid on/off response. IC Role / Device Role / Timing Role: Fast-enable LED driver supporting PWM dimming at 1–5kHz to eliminate visible flicker during video capture. Use Value: Achieves sub-10µs enable delay and <1µA shutdown current - extending standby time between photo sessions. | Use Scenario: Providing consistent keypad and status-display illumination in VoIP desk phones operating from 5V PoE-derived rails. IC Role / Device Role / Timing Role: Fixed-frequency boost converter regulating LED current independent of input ripple from DC/DC converters. Use Value: Maintains <1% line regulation across 4.5–5.5V input range - ensuring stable brightness despite PoE voltage variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3407MMX/NOPB | 1.6MHz switching, 700mA switch current, 200mV FB, no integrated OVP; MSOP-8 package. | Higher current capacity supports 4–5 LED strings; larger footprint and different pinout require layout change. | Select when higher output power or tighter FB tolerance (±1%) is required; not drop-in compatible. |
| MAX16832ATA+T | 1.1MHz, 500mA switch current, 200mV FB, built-in OVP (28V), 8-pin TDFN package. | OVP included; supports 4-series LEDs safely without external clamp; thermal performance superior to YD5. | Choose when OVP is mandatory and board space permits 3×3mm TDFN; requires redesign due to pin count and function mapping. |
Compared with LM3407MMX/NOPB and MAX16832ATA+T, the MIC3287YD5-TR offers the smallest footprint (TSOT-23-5) and lowest quiescent current (<1µA), but lacks OVP and has lower switch current - making it optimal for cost-sensitive, space-constrained 3-LED backlighting where external protection is managed at system level.
Availability
MIC3287YD5-TR is available at Aetrix Electronics and suitable for cell phone backlighting, PDA display illumination, and digital camera viewfinder lighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC3287YD5-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, timing, and interface ICs for portable and industrial applications.
The MIC3287 product line was designed specifically for compact, high-efficiency white LED backlighting in battery-powered consumer electronics - prioritizing low profile, low IQ, and simplified external component count.
FAQ
What is the maximum number of white LEDs the MIC3287YD5-TR can drive?
The MIC3287YD5-TR is rated to drive up to 3-series white LEDs (typical VF ≈ 3.2V each) from a 3.6V input, yielding ~9.6V output. Driving 4 LEDs exceeds its practical output capability without OVP and risks instability or thermal stress due to the 350mA switch limit and lack of overvoltage protection in this variant.
Does the MIC3287YD5-TR include over-voltage protection (OVP)?
No, the MIC3287YD5-TR does not include integrated OVP. OVP is only available on MIC3287-24YD6 and MIC3287-24YML variants. When used in configurations where open-circuit LED failure could cause output overvoltage, external clamping (e.g., Zener or TVS) is required to protect the MIC3287YD5-TR's SW pin, rated to 40V absolute max.
How is LED current set on the MIC3287YD5-TR?
LED current is set by an external resistor (RFB) connected between the FB pin and ground. The MIC3287YD5-TR regulates the voltage at FB to 250mV, so ILED = 250mV / RFB. For example, a 12.5Ω resistor sets 20mA; tolerance of RFB directly impacts current accuracy, as the FB voltage itself has ±7.5% initial tolerance.
Can the MIC3287YD5-TR be used with PWM dimming?
Yes, the MIC3287YD5-TR supports PWM dimming by applying a logic-level PWM signal to the EN pin. The IC fully enables/disables per PWM cycle, delivering true zero-to-full current modulation. Recommended PWM frequency is 100Hz–10kHz; frequencies below 100Hz may cause visible flicker, and above 10kHz require careful EN pin drive strength verification.
What thermal considerations apply to the MIC3287YD5-TR in TSOT-23-5 package?
The MIC3287YD5-TR in Thin SOT-23-5 has θJA = 207°C/W (4-layer PCB). At 350mA switch current and 10V output, power dissipation can exceed 300mW - raising junction temperature significantly. Thermal relief pads, copper pours under the package (though no EP), and minimizing trace resistance on VIN/SW/GND are essential to maintain operation within –40°C to +125°C TJ.
MIC3287YD5-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:
- 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:
- TSOT-23-5
MIC3287YD5-TR FAQ
1.How can I place an order for MIC3287YD5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC3287YD5-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 MIC3287YD5-TR reliable?
The price and inventory of MIC3287YD5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC3287YD5-TR is usually 5 days.
3.What payment methods are accepted for MIC3287YD5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC3287YD5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC3287YD5-TR?
MIC3287YD5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC3287YD5-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 MIC3287YD5-TR?
For technical support, including MIC3287YD5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC3287YD5-TR requirements.
6.How does Aetrix verify that MIC3287YD5-TR is sourced from the original manufacturer or authorized distributors?
All MIC3287YD5-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 MIC3287YD5-TR meets industry standards.
7.What is the process for return or replacement of MIC3287YD5-TR?
All MIC3287YD5-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC3287YD5-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 MIC3287YD5-TR part is unused and in its original packaging.
Return procedure for MIC3287YD5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC3287YD5-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
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LYT1604D-TL
Power Integrations
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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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