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Microchip Technology MIC3289-24YD6-TR
- Part No.:
- MIC3289-24YD6-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MIC3289-24YD6-TR.pdf
- Description:
- IC LED DRVR RGLTR 1.2A TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,114
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Product details
Overview
MIC3289-24YD6-TR from Micrel is a constant-frequency 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 driving up to six series-connected WLEDs in portable backlighting applications powered by single-cell Li-ion (2.5V–6.5V).
For engineers reviewing the MIC3289-24YD6-TR datasheet, MIC3289-24YD6-TR pinout, MIC3289-24YD6-TR application, or MIC3289-24YD6-TR equivalent, this device offers precise ±5% LED current accuracy via 250mV feedback reference, <1µA shutdown current, integrated thermal/UVLO/OVP protection, and compact TSOT23-6L packaging - critical for space-constrained, battery-sensitive designs.
Technical Context
The MIC3289-24YD6-TR implements current-mode PWM control with a fixed 1.2MHz oscillator, slope compensation, and dual-loop regulation: the current amplifier monitors switch current via internal sense, while the gm error amplifier compares LED current-derived feedback against a digitally scaled 250mV reference. Its single-wire DC pin handles both brightness programming (logarithmic 16-step counter) and shutdown activation.
It integrates a bipolar output transistor and Schottky diode, enabling a minimal 4-component solution. The 24V OVP threshold (typ. 22.5V) supports up to six WLEDs in series, and its –40°C to +125°C junction range ensures operation across consumer and industrial ambient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.2 MHz - enables small external inductors/capacitors and reduces input ripple/noise. |
| Feedback Reference Voltage | 250 mV ±5% - minimizes power loss in current-sense resistor and improves efficiency at high LED currents. |
| 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 - directly compatible with single-cell Li-ion and 3–4-cell alkaline/NiMH batteries. |
| Shutdown Current | <1 µA - preserves battery life during standby in portable devices. |
| LED Dimming Control | True 1-wire interface with 16 logarithmic steps - matches human eye sensitivity and eliminates need for continuous MCU PWM generation. |
| Max Switch Current | 750 mA typ. - supports >500 mA continuous LED drive capability with headroom for transient peaks. |
Pinout & Package
Package: TSOT23-6L (Thin SOT-23, 6-lead, low-profile). Pinout validated per Micrel MIC3289 datasheet Rev. June 2007, Figure 1 (SOT23-6 configuration).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Output / OVP Sense Node | Connects to anode of LED string; monitors output voltage for 24V overvoltage protection triggering. |
| 2 (VIN) | Power Input | Supplies internal circuitry; accepts 2.5V–6.5V - direct connection to battery or regulated rail. |
| 3 (DC) | Digital Control Input | Single-wire interface for brightness programming (16 log steps) and shutdown activation (≥1260 µs low pulse). |
| 4 (GND) | Ground Return | Primary ground reference for internal circuits, feedback, and switch node return path. |
| 5 (SW) | Switch Node | Internal bipolar collector node; connects to inductor and Schottky cathode - carries high-frequency switching current. |
| 6 (FB) | Feedback Input | Connects to LED cathode via external sense resistor; regulates LED current using 250mV reference. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky Diode | Eliminates external rectifier, reducing BOM count and PCB area while improving efficiency in boost topology. |
| Logarithmic 16-Step Dimming | Provides perceptually uniform brightness steps - higher resolution at low currents where human eye sensitivity peaks. |
| Presettable Startup Brightness | Allows initialization to any of 16 levels before first LED turn-on - avoids default full-brightness flash on power-up. |
| 24V Overvoltage Protection | Hardware-enforced clamping at 24V nominal prevents damage when driving long LED strings under fault or transient conditions. |
| Thermal & UVLO Protection | Automatic shutdown at 150°C junction temp and below 2.1V VIN ensures robust operation across battery discharge profiles. |
Applications
| Cell Phone Backlighting | PDA Display Illumination |
|---|---|
Use Scenario: Driving 4–6 white LEDs in series for main LCD backlight in slim mobile handsets powered by single-cell Li-ion. IC Role / Device Role / Timing Role: Constant-current boost controller with integrated OVP and 1-wire dimming - replaces discrete FET/diode/PWM IC solutions. Use Value: Reduces component count to four external parts, extends battery runtime via <1µA shutdown and 250mV FB reference, and enables smooth, flicker-free dimming without MCU resource overhead. |
Use Scenario: Powering high-contrast monochrome or color TFT displays in handheld PDAs with variable ambient light conditions. IC Role / Device Role / Timing Role: Digitally programmable WLED driver with preset startup level - supports instant-on display brightness matching user preference or ambient sensor input. Use Value: Eliminates need for external PWM generator or I²C interface; logarithmic scaling delivers consistent perceived brightness changes across full dimming range. |
| Digital Camera Flash Support | GPS System Backlighting |
Use Scenario: Providing stable current for auxiliary white LED flash in compact digital cameras requiring brief high-current pulses. IC Role / Device Role / Timing Role: High-efficiency boost driver with fast turn-on delay (140 µs) and robust OVP - ensures safe LED operation during burst illumination. Use Value: Supports reliable flash output without thermal runaway; 750 mA switch current headroom accommodates short-duration peak loads beyond steady-state 20 mA. |
Use Scenario: Illuminating outdoor-readable LCDs in automotive-grade GPS units operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Automotive-qualified LED driver with –40°C to +125°C junction rating and integrated UVLO/OVP - maintains consistent backlight intensity despite battery voltage sag. Use Value: Ensures uninterrupted visibility under cold cranking or hot parking conditions; 2.5V minimum VIN allows operation down to deeply discharged battery states. |
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 | Fixed 1.3MHz frequency, no internal Schottky, requires external diode; 16V OVP only; 5-pin SOT23 package. | Limited to ≤4 WLEDs; higher BOM count and board area due to external diode requirement. | Select when lower cost outweighs integration benefits and 24V OVP is not required. |
| TPS61061DRVR | 1.4MHz PWM, internal diode, but uses analog/digital hybrid dimming (not pure 1-wire); 20V OVP; 6-pin WSON package. | Lacks true 1-wire simplicity - requires separate enable and dim pins; less intuitive for ultra-low-pin-count MCU interfaces. | Prefer when analog dimming flexibility or higher switching frequency is prioritized over single-wire protocol simplicity. |
Compared with MAX1910EUT+T and TPS61061DRVR, the MIC3289-24YD6-TR uniquely combines 24V OVP, true 1-wire digital control, internal Schottky, and TSOT23-6L packaging - delivering the lowest external component count and highest integration for 6-LED portable backlighting.
Availability
MIC3289-24YD6-TR is available at Aetrix Electronics and suitable for cell phone backlighting, PDA display illumination, GPS system backlighting, and digital camera flash applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MIC3289-24YD6-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, acquired by Microchip Technology in 2015. Known for high-reliability, application-optimized ICs.
The MIC3289-24YD6-TR belongs to Micrel's white LED driver product line, engineered specifically for space- and power-constrained portable electronics requiring simple, efficient, and robust constant-current LED drive with minimal external components.
FAQ
What is the OVP threshold for MIC3289-24YD6-TR?
The MIC3289-24YD6-TR features a nominal 24V overvoltage protection threshold, with a specified range of 21V to 24V per the datasheet. This OVP setting is factory-trimmed and fixed for this variant, enabling safe operation with up to six series-connected white LEDs (assuming ~3.5V forward voltage each). It triggers hardware shutdown to protect downstream components if output exceeds this limit.
Does MIC3289-24YD6-TR require an external Schottky diode?
No, the MIC3289-24YD6-TR integrates a Schottky diode internally, eliminating the need for an external rectifier. This integration reduces total component count to just four external parts (inductor, output capacitor, feedback resistor, and input capacitor), simplifies layout, and improves overall efficiency compared to discrete boost LED drivers.
How does the 1-wire digital control work on MIC3289-24YD6-TR?
The MIC3289-24YD6-TR uses its DC pin for true 1-wire communication: logic-level pulses configure brightness (16 logarithmic steps) or initiate shutdown (≥1260 µs low pulse). No clock or data lines are needed - all timing is self-contained. The IC interprets pulse widths and sequences to change modes (count up/down) or preset startup level, making it ideal for microcontroller GPIO-limited designs.
What is the minimum input voltage for MIC3289-24YD6-TR to operate?
The MIC3289-24YD6-TR operates from a minimum input voltage of 2.5V, with under-voltage lockout (UVLO) releasing at approximately 2.1V. This allows direct use with partially discharged single-cell Li-ion batteries (down to ~2.8V typical cutoff) and compatibility with 3-cell alkaline/NiMH systems, supporting extended runtime in portable applications.
Is MIC3289-24YD6-TR pin-compatible with other MIC3289 variants?
Yes, the MIC3289-24YD6-TR shares identical pinout and footprint with other TSOT23-6L variants like MIC3289-16YD6, differing only in factory-set OVP threshold (24V vs. 16V) and marking code. This allows design reuse across different LED string configurations without PCB revision - simply select the appropriate OVP version based on maximum expected output voltage.
MIC3289-24YD6-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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:
- TSOT-23-6
MIC3289-24YD6-TR FAQ
1.How can I place an order for MIC3289-24YD6-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC3289-24YD6-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 MIC3289-24YD6-TR reliable?
The price and inventory of MIC3289-24YD6-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC3289-24YD6-TR is usually 5 days.
3.What payment methods are accepted for MIC3289-24YD6-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC3289-24YD6-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC3289-24YD6-TR?
MIC3289-24YD6-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC3289-24YD6-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 MIC3289-24YD6-TR?
For technical support, including MIC3289-24YD6-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC3289-24YD6-TR requirements.
6.How does Aetrix verify that MIC3289-24YD6-TR is sourced from the original manufacturer or authorized distributors?
All MIC3289-24YD6-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 MIC3289-24YD6-TR meets industry standards.
7.What is the process for return or replacement of MIC3289-24YD6-TR?
All MIC3289-24YD6-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC3289-24YD6-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 MIC3289-24YD6-TR part is unused and in its original packaging.
Return procedure for MIC3289-24YD6-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC3289-24YD6-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
-
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
-
BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
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