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Microchip Technology MIC2289-34YML-TR
- Part No.:
- MIC2289-34YML-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 8-VFDFN Exposed Pad, 8-MLF®
- Datasheet:
-
MIC2289-34YML-TR.pdf
- Description:
- IC LED DRVR RGLTR PWM 750MA 8MLF
- Quantity:
- Payment:
- Shipping:
Inventory:11,058
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Product details
Overview
MIC2289-34YML-TR from Microchip Technology is a constant-frequency PWM boost switching regulator optimized for constant-current white LED driver applications, featuring an internal Schottky diode, 34V output overvoltage protection (OVP), 1.2 MHz switching frequency, 95 mV feedback reference, and operation across 2.5V–10V input range. It delivers up to 500 mA switch current and supports LED backlighting in compact portable devices.
For engineers reviewing the MIC2289-34YML-TR datasheet, MIC2289-34YML-TR pinout, MIC2289-34YML-TR application, or MIC2289-34YML-TR equivalent, this device is selected for high-efficiency, space-constrained LED drivers requiring precise current regulation, low quiescent current (<1 µA shutdown), and robust open-circuit protection with fixed 34V OVP clamping.
Technical Context
The MIC2289-34YML-TR implements current-mode PWM control with a 1.2 MHz oscillator, slope-compensated ramp generator, and gm error amplifier referenced to 95 mV. Its bipolar output transistor supports ≥500 mA peak switch current and integrates internal Schottky diode conduction path.
OVP is implemented via dedicated OUT pin monitoring with fixed 34V threshold-confirmed for this variant per Microchip's product identification system-and clamps output during open-LED fault conditions. Thermal shutdown activates at 150°C with 10°C hysteresis, and UVLO triggers between 1.8V–2.4V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 10 V - Supports single-cell Li-ion (3.0–4.2 V) and multi-cell alkaline/NiMH sources without external LDO pre-regulation. |
| Output OVP Threshold | 30 V to 34 V - Fixed 34V OVP option ensures safe clamping for ≥8-series white LED strings (≈28–32 V typical forward voltage). |
| Feedback Reference Voltage | 90–100 mV (typ. 95 mV) - Enables ultra-low-power current-sense resistor design, minimizing I²R loss and thermal drift in battery-powered systems. |
| Switching Frequency | 1.05–1.35 MHz (typ. 1.2 MHz) - Enables use of sub-10 µH inductors and <0.33 µF ceramic output capacitors, reducing board area by >40% vs. 500 kHz designs. |
| Shutdown Current | 0.1–1 µA - Ensures negligible battery drain in standby mode for always-on portable lighting and display systems. |
| Operating Junction Temp | –40°C to +125°C - Qualified for automotive cabin, industrial HMI, and extended-temperature consumer electronics environments. |
| Package | 2 mm × 2 mm DFN-8 (ML) - Exposed pad enhances thermal dissipation; footprint compatible with automated optical inspection and fine-pitch reflow. |
Pinout & Package
Package: 2 mm × 2 mm, 0.9 mm height, 8-pin DFN (ML) with exposed thermal pad (EP). RoHS-compliant, matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Output & OVP Sense Node | Connects to LED anodes and output capacitor; monitors output voltage for 34V OVP clamp activation during open-circuit faults. |
| 2 (VIN) | Main Power Input | Supplies internal circuitry and switch driver; accepts 2.5–10 V with UVLO (2.1 V typ.) and absolute max 12 V rating. |
| 3 (EN) | Enable Control Input | Active-high logic interface (1.5 V min high, 0.4 V max low); pulls VIN current to <1 µA in shutdown state. |
| 4 (AGND) | Analog Ground Reference | Separate ground return for FB and error amplifier; must be routed to PGND near IC to minimize noise coupling into 95 mV reference path. |
| 5 (NC) | No Connect | Internally unconnected; no PCB trace or solder mask required; leave floating or tie to AGND if mechanical stability needed. |
| 6 (SW) | Switch Node | Collector of integrated bipolar transistor; connects to inductor and Schottky cathode; rated for –0.3 V to +34 V swing. |
| 7 (FB) | Current-Sense Feedback Input | Connects to LED cathode via external resistor; regulates LED current as ILED = 95 mV / RFB; input bias ≤ –450 nA. |
| 8 (PGND) | Power Ground Return | High-current return path for switch and Schottky; must be low-inductance plane connected to EP for thermal and EMI performance. |
| EP | Exposed Thermal Pad | Internally tied to PGND; requires ≥80% solder coverage and thermal vias to inner ground planes for θJA = 93°C/W operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky Diode | Eliminates external diode, reduces BOM count by one component, and avoids reverse recovery losses in boost topology. |
| Fixed 34V Output OVP | Hardware-enforced clamping prevents SW node overvoltage during LED string open-circuit, protecting both IC and output capacitor. |
| 95 mV Feedback Reference | Enables use of low-value, low-tolerance sense resistors (e.g., 4.75 Ω for 20 mA), minimizing power loss and thermal derating impact. |
| 1.2 MHz Constant-Frequency PWM | Ensures predictable EMI spectrum, simplifies filtering, and allows smaller passive components versus variable-frequency alternatives. |
| Two-Ground Architecture (AGND/PGND) | Isolates sensitive analog feedback path from high-di/dt power switching currents, improving current regulation accuracy (<1% line/load). |
Applications
| Cell Phone Backlighting | Digital Camera Flash |
|---|---|
Use Scenario: Driving 4–6 series white LEDs in ultra-thin smartphone displays with dynamic brightness control. IC Role / Device Role / Timing Role: Constant-current boost controller regulating LED current via FB pin; enables PWM dimming at 1–10 kHz via EN pin toggling. Use Value: Delivers stable 20 mA per LED string across full battery discharge (3.6 V → 3.0 V), maintaining luminance uniformity without efficiency penalty. |
Use Scenario: Providing short-duration, high-intensity flash illumination in compact digital cameras and action cams. IC Role / Device Role / Timing Role: High-efficiency boost driver delivering up to 350 mA pulsed current to 2–3 series LEDs; supports soft-start to limit inrush. Use Value: Achieves >85% efficiency at 350 mA with 10 µH inductor, enabling rapid flash recharge and minimal thermal rise in sealed enclosures. |
| IP Phone Display Lighting | Portable LED Flashlight |
Use Scenario: Illuminating monochrome or color LCD status displays in enterprise VoIP handsets operating from PoE or wall adapters. IC Role / Device Role / Timing Role: Low-noise, constant-current source with continuous dimming via DC voltage on FB pin (e.g., DAC output). Use Value: Maintains flicker-free dimming down to 1% brightness using 0–1 V FB control, eliminating audible coil whine common in PWM-dimmed boost converters. |
Use Scenario: Powering high-brightness white LED modules in handheld emergency lights and tactical flashlights powered by 2×AA/AAA cells. IC Role / Device Role / Timing Role: Wide-input (2.5–10 V) boost regulator supporting alkaline, NiMH, and Li-ion sources; includes UVLO and thermal shutdown. Use Value: Extends runtime by >25% vs. linear drivers due to >90% peak efficiency and <1 µA shutdown current preserving battery shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC2289-24YML-TR | Fixed 24V OVP threshold instead of 34V; identical package, pinout, and electrical specs otherwise. | Suitable for ≤6-series LED strings (max ~21 V); requires higher-voltage-rated output capacitor for same LED count. | Select when lower OVP margin suffices and cost-sensitive sourcing favors volume-available 24V variant. |
| MAX1910ETE+ | 28V OVP, 500 kHz switching, external Schottky required, TQFN-16 package; no integrated diode. | Higher board area and BOM count; less suitable for space-constrained portable designs. | Consider only if legacy MAX1910 design reuse or specific 28V OVP requirement exists; not drop-in compatible. |
Compared with MIC2289-24YML-TR, the MIC2289-34YML-TR supports higher LED string voltages without capacitor derating, while the MAX1910ETE+ demands external diode placement and increases layout complexity-making MIC2289-34YML-TR optimal for new 7–8 LED designs prioritizing integration and miniaturization.
Availability
MIC2289-34YML-TR is available at Aetrix Electronics and suitable for cell phone backlighting, portable LED flashlights, IP phone displays, and digital camera flash circuits requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC2289-34YML-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
Microchip Technology is a global semiconductor company specializing in microcontrollers, analog devices, and timing solutions, with emphasis on reliability, low-power design, and embedded control.
The MIC2289 family is designed specifically for space-constrained, battery-powered white LED backlighting and flash applications-delivering high efficiency, integrated protection, and minimal external component count.
FAQ
What is the maximum LED string voltage supported by MIC2289-34YML-TR?
The MIC2289-34YML-TR features a fixed 34V output overvoltage protection threshold, allowing safe operation with LED strings up to ≈32 V forward voltage (e.g., 8× white LEDs at 3.8–4.0 V each). The actual maximum regulated output depends on input voltage, inductor selection, and load current-but OVP clamps at 34V to prevent damage during open-circuit faults. This makes MIC2289-34YML-TR ideal for high-string-count portable lighting where headroom exceeds 24V variants.
Does MIC2289-34YML-TR require an external Schottky diode?
No, MIC2289-34YML-TR integrates a Schottky diode internally-confirmed in the Functional Block Diagram and General Description sections of DS20006207A. This eliminates the need for an external diode, reduces bill-of-materials count, saves PCB area, and avoids reverse-recovery losses. The internal diode supports up to 34V reverse voltage and 150 mA forward current per datasheet curves, sufficient for typical LED driver applications using the MIC2289-34YML-TR.
How is LED current set on MIC2289-34YML-TR?
LED current is set by a single external resistor (RFB) connected between the FB pin and LED cathode, using the formula ILED = 95 mV / RFB. For example, a 4.75 Ω resistor sets 20 mA. The 95 mV reference is tightly specified (±5%), enabling accurate current regulation without trimming. The FB pin draws only –450 nA, minimizing error from resistor self-heating or leakage-critical for stable performance in MIC2289-34YML-TR implementations.
Can MIC2289-34YML-TR be used with PWM dimming?
Yes, MIC2289-34YML-TR supports PWM dimming via its EN pin: applying a logic-level PWM signal (100 Hz–10 kHz) directly toggles the regulator on/off, proportionally controlling average LED current. This method achieves high efficiency because the IC draws <1 µA during off-cycles. The MIC2289-34YML-TR's fast enable response (<10 µs turn-on) ensures clean dimming without visible flicker or startup overshoot-verified in Figure 2-11 of the datasheet.
What thermal management is required for MIC2289-34YML-TR in DFN-8 package?
The MIC2289-34YML-TR in 2 mm × 2 mm DFN-8 has θJA = 93°C/W with proper PCB layout: the exposed thermal pad (EP) must be soldered with ≥80% coverage and connected via ≥4 thermal vias (0.3 mm diameter) to an internal ground plane. Without this, junction temperature can exceed +125°C under 500 mA load at +85°C ambient. The device includes overtemperature shutdown at +150°C (10°C hysteresis), but sustained operation above +125°C degrades reliability-so thermal design is essential for MIC2289-34YML-TR longevity.
MIC2289-34YML-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):
- 2.5V
- 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:
- 8-MLF® (2x2)
MIC2289-34YML-TR FAQ
1.How can I place an order for MIC2289-34YML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2289-34YML-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 MIC2289-34YML-TR reliable?
The price and inventory of MIC2289-34YML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2289-34YML-TR is usually 5 days.
3.What payment methods are accepted for MIC2289-34YML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2289-34YML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2289-34YML-TR?
MIC2289-34YML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2289-34YML-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 MIC2289-34YML-TR?
For technical support, including MIC2289-34YML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2289-34YML-TR requirements.
6.How does Aetrix verify that MIC2289-34YML-TR is sourced from the original manufacturer or authorized distributors?
All MIC2289-34YML-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 MIC2289-34YML-TR meets industry standards.
7.What is the process for return or replacement of MIC2289-34YML-TR?
All MIC2289-34YML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2289-34YML-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 MIC2289-34YML-TR part is unused and in its original packaging.
Return procedure for MIC2289-34YML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC2289-34YML-TR Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
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BCR420UFD-7
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BCR421UFD-7
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