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Microchip Technology MIC3289-24YML-TR
- Part No.:
- MIC3289-24YML-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 8-VFDFN Exposed Pad, 8-MLF®
- Datasheet:
-
MIC3289-24YML-TR.pdf
- Description:
- IC LED DRIVER RGLTR 1.2A 8MLF
- Quantity:
- Payment:
- Shipping:
Inventory:4,089
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Product details
Overview
MIC3289-24YML-TR from Micrel is a 1.2MHz PWM boost white LED driver IC with internal Schottky diode, true 1-wire digital dimming control (16 logarithmic steps), and 24V overvoltage protection - designed for constant-current driving of up to six series-connected WLEDs in portable backlighting applications. It operates from 2.5V–6.5V input, delivers ±5% LED current accuracy via 250mV feedback reference, and features <1µA shutdown current.
For engineers reviewing the MIC3289-24YML-TR datasheet, MIC3289-24YML-TR pinout, MIC3289-24YML-TR application, or MIC3289-24YML-TR equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for battery-powered LED backlighting and flash designs.
Technical Context
The MIC3289-24YML-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 the LED current-sense voltage against a 250mV reference, while the digital interface directly programs brightness level or shutdown via pulse-width-modulated logic transitions on the single DC pin.
It integrates a Schottky diode and supports OVP at 24V nominal (21–24V range), enabling safe operation with up to six white LEDs in series. The device uses pre-programmable startup brightness and includes UVLO (2.1V typ), overtemperature shutdown (150°C), and 2A switch current capability - all within a –40°C to +125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.2 MHz - enables compact external inductor (e.g., 4.7 µH) and output capacitor (e.g., 0.27 µF), reducing board area and input ripple. |
| Feedback Reference Voltage | 250 mV ±5% - minimizes power loss in current-sense resistor while maintaining high LED current accuracy across temperature. |
| OVP Threshold | 24 V (nominal), 21–24 V range - protects circuit when driving up to six series WLEDs with forward voltage ~3.5V each. |
| Input Voltage Range | 2.5 V to 6.5 V - supports direct connection to single-cell Li-ion (3.0–4.2 V) or 3–4-cell alkaline/NiMH batteries. |
| Shutdown Current | <1 µA - preserves battery life during standby in portable devices like cell phones and GPS units. |
| Digital Control Interface | True 1-wire, edge-triggered - requires no MCU PWM generation; brightness presetting and mode changes use defined pulse widths (e.g., tMODE_DOWN = 420–500 µs). |
| Switch Current Limit | 500–1200 mA - supports >500 mA peak switch current for high-brightness LED strings without external current limiting. |
Pinout & Package
The MIC3289-24YML-TR is housed in a 2 mm × 2 mm, 8-pin leadless MLF® (Micro Lead Frame) package with exposed thermal pad. Pin numbering follows standard MLF orientation (top view, pin 1 marked).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Output and Overvoltage Protection node - connects to anode of LED string; clamps at 24V to prevent damage during open-circuit or overvoltage events. |
| 2 | GND | Ground return - shared for power, analog, and digital sections; backside thermal pad must be soldered to PCB ground plane for thermal performance. |
| 3 | SW | Switch node - connects to inductor and internal bipolar collector; carries high di/dt switching current; requires tight layout to minimize EMI. |
| 4 | FB | Feedback input - connects to cathode of LED string via sense resistor; sets LED current via ILED = 250 mV / RSENSE. |
| 5 | DC | Digital control - single-wire interface for brightness programming (16 log steps) and shutdown; accepts logic-level pulses with precise timing windows. |
| 6 | VIN | Supply input - powers internal circuitry; accepts 2.5–6.5 V; includes UVLO (2.1 V typ) to prevent erratic startup at low battery. |
| 7,8 | GND | Additional ground terminals - electrically tied to pin 2 and thermal pad; improves grounding integrity and reduces noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diode | Eliminates need for external rectifier, reducing BOM count to only four external components (inductor, capacitor, sense resistor, input cap). |
| 16-step logarithmic dimming | Matches human eye sensitivity - finer resolution at low brightness levels (e.g., 1–3 mA) where perception is most acute. |
| Presettable startup brightness | Allows system to power-on at user-defined level (e.g., level 6) without MCU intervention, using timing-controlled pulses during tSTART_UP. |
| 24V OVP with hysteresis | Prevents destructive overvoltage during LED string disconnection or cold-start surge; threshold stable over temperature (±1.5V tolerance). |
| Thermal shutdown at 150°C | Protects die under sustained overload or poor heatsinking; auto-recovery after cooldown ensures robust field operation. |
Applications
| Cell Phone Backlighting | GPS Device Display |
|---|---|
|
Use Scenario: Driving 4–6 white LEDs in series for main LCD backlight in slim mobile handsets powered by single-cell Li-ion battery. IC Role / Device Role / Timing Role: Constant-current PWM boost regulator with integrated Schottky and 1-wire digital control - replaces discrete FET+diode+controller solution. Use Value: Enables ultra-thin design (2mm × 2mm MLF package), extends battery runtime via <1µA shutdown and 250mV reference, and simplifies firmware with presettable brightness. |
Use Scenario: Powering high-contrast monochrome or color TFT display in automotive-grade GPS units operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: High-efficiency LED driver with 24V OVP and thermal shutdown - ensures reliable operation during vehicle ignition transients and extended outdoor exposure. Use Value: Maintains ±5% LED current accuracy over full temperature range, withstands 12V system surges via 24V OVP, and avoids flicker with fixed 1.2MHz switching frequency. |
| Digital Camera Flash | Portable Media Player UI Lighting |
|
Use Scenario: Delivering short-duration, high-current pulses to white LED array for still-image capture in compact digital cameras. IC Role / Device Role / Timing Role: Fast-turn-on boost driver (140µs start-up delay) with programmable brightness and shutdown - synchronized to camera shutter signal via DC pin. Use Value: Achieves consistent flash intensity across battery voltage range (2.5–4.2V), eliminates need for external current DAC or PWM generator, and supports one-step brightness adjustment. |
Use Scenario: Illuminating keypad, status LEDs, or OLED menu indicators in MP3 players and handheld gaming devices. IC Role / Device Role / Timing Role: Low-quiescent-current LED controller with logarithmic dimming - interfaces directly to baseband processor GPIO without dedicated PWM peripheral. Use Value: Reduces MCU resource load (no continuous PWM generation), extends play time via 1µA shutdown, and provides smooth, perceptually linear brightness transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16832ETA+ | Higher 2.2MHz switching frequency; no integrated Schottky; requires external MOSFET and diode; 2.7–28V input. | Better suited for higher-input-voltage industrial LED lighting; lacks 1-wire interface - uses analog dimming or PWM input. | Select when input exceeds 6.5V or when higher efficiency at >100mA is required; not drop-in due to different topology and pinout. |
| TPS61165DRVR | 1.2MHz boost driver with integrated MOSFET (no Schottky); 2.7–6V input; 32V OVP; I²C interface instead of 1-wire. | Requires I²C host and external Schottky; supports up to 30mA per channel (dual-channel version); no pre-programmable startup. | Choose for systems already using I²C infrastructure; not compatible with MIC3289-24YML-TR's timing-based digital control or pinout. |
Compared with MAX16832ETA+ and TPS61165DRVR, the MIC3289-24YML-TR uniquely combines integrated Schottky diode, true 1-wire digital control with presettable startup, and 24V OVP in a 2mm × 2mm MLF package - making it optimal for space-constrained, battery-powered portable backlighting where minimal external components and zero-MCU-PWM overhead are critical.
Availability
MIC3289-24YML-TR is available at Aetrix Electronics and suitable for cell phone backlighting, GPS display illumination, and portable media player LED control requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MIC3289-24YML-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 semiconductor company specializing in analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015. Known for high-reliability, low-power ICs targeting portable and industrial markets.
The MIC3289-24YML-TR belongs to Micrel's white LED driver product line, engineered specifically for compact, battery-operated consumer electronics requiring efficient, digitally controllable constant-current sources with minimal external components.
FAQ
What is the OVP setting for MIC3289-24YML-TR?
The MIC3289-24YML-TR has a nominal overvoltage protection threshold of 24 V, with a specified range of 21 V to 24 V. This OVP feature safeguards the IC and connected LED string during open-circuit conditions or input surges. It is factory-set and not adjustable - distinct from the MIC3289-16YML-TR, which uses a 16 V OVP threshold.
Does MIC3289-24YML-TR require an external Schottky diode?
No, the MIC3289-24YML-TR integrates a Schottky diode internally, eliminating the need for an external rectifier. This integration reduces total component count to just four external parts: input capacitor, inductor, output capacitor, and current-sense resistor - simplifying layout and improving reliability in space-constrained designs.
How does the 1-wire digital interface of MIC3289-24YML-TR work?
The MIC3289-24YML-TR uses its DC pin for true 1-wire communication: brightness level changes and shutdown are triggered by precisely timed logic pulses (e.g., 420–500 µs low pulse for Count Down Mode change). No clock line or bidirectional protocol is needed - the IC interprets pulse width and edge timing to execute commands autonomously.
What is the feedback reference voltage of MIC3289-24YML-TR?
The MIC3289-24YML-TR uses a 250 mV ±5% internal reference voltage at the FB pin. LED current is calculated as ILED = 250 mV / RSENSE, enabling accurate constant-current regulation with minimal power loss across the sense resistor - critical for efficiency in battery-powered applications.
Can MIC3289-24YML-TR drive six white LEDs in series?
Yes, the MIC3289-24YML-TR supports up to six white LEDs in series thanks to its 24 V OVP rating and ability to generate output voltages up to VOVP. With typical white LED forward voltage of ~3.5 V, six LEDs require ~21 V - well within the 24 V protection limit and compatible with the IC's boost architecture and 2A switch current capability.
MIC3289-24YML-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad, 8-MLF®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.5V
- Voltage - Supply (Max):
- 6.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1.2A (Switch)
- Frequency:
- 1.2MHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MLF® (2x2)
MIC3289-24YML-TR FAQ
1.How can I place an order for MIC3289-24YML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC3289-24YML-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 MIC3289-24YML-TR reliable?
The price and inventory of MIC3289-24YML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC3289-24YML-TR is usually 5 days.
3.What payment methods are accepted for MIC3289-24YML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC3289-24YML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC3289-24YML-TR?
MIC3289-24YML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC3289-24YML-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 MIC3289-24YML-TR?
For technical support, including MIC3289-24YML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC3289-24YML-TR requirements.
6.How does Aetrix verify that MIC3289-24YML-TR is sourced from the original manufacturer or authorized distributors?
All MIC3289-24YML-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 MIC3289-24YML-TR meets industry standards.
7.What is the process for return or replacement of MIC3289-24YML-TR?
All MIC3289-24YML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC3289-24YML-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 MIC3289-24YML-TR part is unused and in its original packaging.
Return procedure for MIC3289-24YML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC3289-24YML-TR Tags
-
BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
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