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Microchip Technology MIC2289C-34YD6-TR
- Part No.:
- MIC2289C-34YD6-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MIC2289C-34YD6-TR.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,906
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Product details
Overview
MIC2289C-34YD6 from Micrel is a constant-frequency PWM boost LED driver IC optimized for white LED backlighting in portable devices, featuring an internal Schottky diode, 34V overvoltage protection (OVP), 95mV feedback reference, and 1.2MHz switching frequency. It delivers up to 500mA switch current, operates from 2.5V–10V input, and supports up to 7-series white LEDs with <1% line/load regulation.
For engineers reviewing the MIC2289C-34YD6 datasheet, MIC2289C-34YD6 pinout, MIC2289C-34YD6 application, or MIC2289C-34YD6 equivalent, key selection considerations include OVP threshold (32V typ), thin SOT-23-6 package footprint, shutdown current (<1µA), thermal shutdown at 150°C, and compatibility with PWM or analog dimming control schemes.
Technical Context
The MIC2289C-34YD6 implements current-mode PWM control using a 1.2MHz oscillator, slope-compensated ramp generator, and gm error amplifier referenced to 95mV. Its bipolar output transistor and integrated Schottky diode enable efficient boost conversion without external rectification.
It features dedicated open-circuit protection via OVP monitoring on the OUT pin, clamping output voltage at 34V nominal to prevent SW node overstress during LED string failure. UVLO (2.1V typ) and overtemperature shutdown (150°C) ensure robust operation across –40°C to +125°C junction temperature range.
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 LDO. |
| Switching Frequency | 1.2 MHz (typ) - enables use of small 6.8–10µH inductors and sub-1µF output capacitors, reducing board area. |
| Feedback Voltage | 95 mV (±10%) - minimizes I²R loss in current-sense resistor and lowers minimum required output voltage. |
| OVP Threshold | 32 V (typ), 27–37 V (min/max) - protects output stage during open-LED fault; specific to MIC2289C-34YD6 variant. |
| Switch Current Limit | 750 mA (min) - ensures safe drive for up to 7-series white LEDs at 20mA each under worst-case conditions. |
| Shutdown Current | <1 µA - extends battery life in standby mode; enabled via logic-low EN pin. |
| Line/Load Regulation | <0.5% - maintains stable LED current despite input voltage drift or load variation, critical for uniform display brightness. |
Pinout & Package
Package: Thin SOT-23-6 (D6), Pb-free, 2.2mm × 2.2mm × 0.95mm profile, θJA = 177°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch node (collector of internal bipolar transistor) | Connects to inductor; carries high di/dt switching current; requires tight layout to minimize EMI and voltage spikes. |
| 2 - GND | Power and signal ground reference | Must be low-impedance connection to PCB ground plane; shared return for FB, EN, and VIN decoupling paths. |
| 3 - FB | Current-sense feedback input | Connected to LED cathode; sets LED current via RSET = 95mV / ILED; high-impedance node sensitive to noise. |
| 4 - EN | Logic-enable input | Active-high (≥1.5V); enables/disables switching; supports PWM dimming when driven with 100Hz–10kHz square wave. |
| 5 - VIN | Main supply input (2.5–10V) | Provides power to internal circuitry; requires local 1µF ceramic decoupling close to pin. |
| 6 - OUT | Output and OVP sense node | Connects to output capacitor and LED anodes; monitored by internal OVP comparator; clamps at 34V during fault. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diode | Eliminates external rectifier, reduces BOM count and footprint, and improves efficiency by ~3–5% vs discrete solutions. |
| 34V OVP option | Hardware-enforced output voltage limit prevents damage during open-LED faults; specific to MIC2289C-34YD6 marking. |
| 95mV feedback reference | Lowers power dissipation in current-sense resistor by >80% vs 1.25V references, enabling smaller resistors and higher accuracy. |
| 1.2MHz constant-frequency PWM | Enables compact magnetics and filtering; avoids audible noise and simplifies EMI compliance vs variable-frequency alternatives. |
| Thermal shutdown with hysteresis | Shuts down at 150°C (±10°C) and restarts at 140°C, preventing latch-up and enabling safe recovery in thermally constrained designs. |
Applications
| Cell Phone Backlighting | PDA Display Illumination |
|---|---|
|
Use Scenario: Driving 3–6 white LEDs in series for main LCD backlight in GSM/UMTS smartphones with single Li-ion battery supply. IC Role / Device Role / Timing Role: Constant-current boost regulator with PWM dimming interface; regulates LED current independent of battery voltage sag. Use Value: Maintains consistent brightness across 3.0–4.2V battery range while achieving >85% peak efficiency and <1µA shutdown current. |
Use Scenario: Powering high-brightness QVGA or VGA LCD backlights in handheld PDAs with limited PCB area and thermal budget. IC Role / Device Role / Timing Role: Compact white LED driver with integrated Schottky and OVP; manages LED string current via FB pin with minimal external components. Use Value: Reduces component count to only four external parts (inductor, input/output caps, current-set resistor) and fits within 5mm² footprint. |
| Digital Camera Flash/Backlight | IP Phone Keypad Illumination |
|
Use Scenario: Providing regulated current to 3–4 white LEDs for rear-panel flash assist or front-panel status backlight in compact digital cameras. IC Role / Device Role / Timing Role: High-efficiency boost converter with fast enable/disable response; supports burst-mode flash timing via EN pin control. Use Value: Delivers 20–30mA per LED with <0.5% current regulation error, enabling precise exposure control and uniform illumination. |
Use Scenario: Illuminating membrane keypad LEDs and status indicators in VoIP desk phones powered from PoE or wall adapter. IC Role / Device Role / Timing Role: Low-quiescent-current LED driver supporting analog dimming via DC voltage injection on FB pin. Use Value: Enables smooth brightness adjustment using DAC output or filtered PWM, eliminating flicker while maintaining <1% current drift over temperature. |
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+ | Higher 1.5MHz switching frequency; 28V OVP; requires external Schottky diode; 10-pin TDFN package. | Better suited for ultra-compact designs needing >1.2MHz operation but adds BOM cost and layout complexity. | Select MAX1910ETE+ only if higher frequency or tighter OVP tolerance (±2%) is required; not pin-compatible. |
| TPS61060DRVR | 1.4MHz fixed-frequency boost; 28V OVP; integrated MOSFET (not bipolar); 6-pin WSON package; 1.2V min input. | Supports lower-input-voltage systems (e.g., 2xAA) but lacks internal Schottky and has different thermal performance. | Choose TPS61060DRVR for wider input range or MOSFET-based efficiency targets; requires redesign due to different pinout and control scheme. |
Compared with MAX1910ETE+ and TPS61060DRVR, the MIC2289C-34YD6 offers unique integration of bipolar switch + Schottky diode in thin SOT-23-6, delivering lowest external part count for 3–7 LED strings at 2.5–10V input, with deterministic 34V OVP clamping and proven reliability in portable consumer designs.
Availability
MIC2289C-34YD6 is available at Aetrix Electronics and suitable for cell phone backlighting, PDA display illumination, digital camera LED drivers, IP phone keypad lighting, and portable medical device indicators requiring stable component supply and long-term industrial availability.
Supply support for MIC2289C-34YD6 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, acquired by Microchip Technology in 2015; known for high-performance power management, timing, and interface ICs.
The MIC2289C product line was designed specifically for space-constrained, battery-powered white LED backlighting applications demanding high efficiency, minimal external components, and robust fault protection - especially in mobile consumer electronics.
FAQ
What is the exact overvoltage protection (OVP) threshold for MIC2289C-34YD6?
The MIC2289C-34YD6 has a guaranteed OVP threshold of 27V (min), 32V (typ), and 37V (max) at TJ = 25°C. This 34V-rated protection is factory-trimmed and specific to the -34YD6 variant; it actively clamps the OUT pin voltage during open-LED faults to prevent damage to the internal switch and output capacitor. The OVP comparator monitors the OUT pin directly and does not require external components.
Can MIC2289C-34YD6 drive more than 6 white LEDs in series?
Yes - the MIC2289C-34YD6 can reliably drive up to 7-series white LEDs (nominal VF ≈ 3.2V each) with total forward voltage up to ~22.4V, well within its 34V OVP limit and typical 25–28V output capability. Efficiency remains >80% at 20mA with proper inductor selection (e.g., 10µH) and layout; driving 8+ LEDs risks exceeding safe operating margins under worst-case VF and temperature conditions.
How does the 95mV feedback voltage improve system performance in MIC2289C-34YD6?
The 95mV feedback voltage in MIC2289C-34YD6 reduces power loss in the current-sense resistor by over 90% compared to conventional 1.25V references, enabling use of higher-value, lower-tolerance resistors (e.g., 4.75Ω for 20mA) with improved thermal stability and reduced self-heating error. This directly enhances LED current accuracy and long-term brightness consistency across battery discharge cycles.
Is MIC2289C-34YD6 compatible with PWM dimming, and what frequency range is supported?
Yes - MIC2289C-34YD6 supports direct PWM dimming via the EN pin. A logic-level square wave (0V/3.6V) applied to EN toggles the IC fully on/off, enabling precise average current control. Recommended frequency is 100Hz–10kHz; frequencies below 100Hz may cause visible flicker, while above 10kHz require careful gate-drive timing but eliminate audible noise. Duty cycle linearly controls average LED current.
What thermal derating guidance applies to MIC2289C-34YD6 in continuous operation?
At TA = 25°C with no airflow and standard 2-layer PCB (1oz Cu, 1in² copper pour under D6 package), MIC2289C-34YD6 delivers full 500mA switch current. For every 10°C rise in ambient temperature above 25°C, maximum sustainable output current must be reduced by ~15mA due to θJA = 177°C/W and 150°C thermal shutdown threshold. Layout with thermal vias and larger ground planes improves this margin significantly.
MIC2289C-34YD6-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:
- Active
- 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:
- 34V
- Current - Output / Channel:
- 750mA (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-23-6
MIC2289C-34YD6-TR FAQ
1.How can I place an order for MIC2289C-34YD6-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2289C-34YD6-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 MIC2289C-34YD6-TR reliable?
The price and inventory of MIC2289C-34YD6-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2289C-34YD6-TR is usually 5 days.
3.What payment methods are accepted for MIC2289C-34YD6-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2289C-34YD6-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2289C-34YD6-TR?
MIC2289C-34YD6-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2289C-34YD6-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 MIC2289C-34YD6-TR?
For technical support, including MIC2289C-34YD6-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2289C-34YD6-TR requirements.
6.How does Aetrix verify that MIC2289C-34YD6-TR is sourced from the original manufacturer or authorized distributors?
All MIC2289C-34YD6-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 MIC2289C-34YD6-TR meets industry standards.
7.What is the process for return or replacement of MIC2289C-34YD6-TR?
All MIC2289C-34YD6-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2289C-34YD6-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 MIC2289C-34YD6-TR part is unused and in its original packaging.
Return procedure for MIC2289C-34YD6-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC2289C-34YD6-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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