My Inquiry
My Account
Microchip Technology MIC2289-34BML-TR
- Part No.:
- MIC2289-34BML-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 8-VFDFN Exposed Pad, 8-MLF®
- Datasheet:
-
MIC2289-34BML-TR.pdf
- Description:
- IC LED DRVR RGLTR PWM 750MA 8MLF
- Quantity:
- Payment:
- Shipping:
Inventory:4,094
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MIC2289-34BML-TR from Microchip Technology is a constant-frequency PWM boost switching regulator optimized for constant-current white LED driver applications. It operates from 2.5V to 10V input, delivers up to 34V output with internal Schottky diode, features 95 mV feedback voltage and 1.2 MHz switching frequency, and is used in backlighting for portable devices such as digital cameras and IP phones.
For engineers reviewing the MIC2289-34BML-TR datasheet, MIC2289-34BML-TR pinout, MIC2289-34BML-TR application, or MIC2289-34BML-TR equivalent, key selection criteria include OVP level (34 V), thermal performance in DFN-8 package (θJA = 93°C/W), shutdown current (<1 μA), and compatibility with single-cell Li-ion input sources.
Technical Context
The MIC2289-34BML-TR implements current-mode PWM control with a fixed 1.2 MHz oscillator, slope-compensated ramp generator, and gm error amplifier referenced to 95 mV. Its bipolar output switch supports >500 mA peak current and integrates internal Schottky diode to reduce external component count.
OVP is hardwired to 34 V via the OUT pin and clamps output during open-LED fault conditions. The device uses separate analog ground (AGND) and power ground (PGND) pins in its DFN-8 package to minimize noise coupling and improve regulation stability under dynamic load steps.
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 inputs without pre-regulation. |
| Output OVP Threshold | 30–34 V - factory-set 34 V option enables safe driving of 7–8 series white LEDs (~3.2 V each) with margin. |
| Feedback Voltage | 95 mV ±5% - low reference reduces I²R loss in current-sense resistor and improves efficiency at high LED currents. |
| Switching Frequency | 1.2 MHz typical - enables use of small 10 µH inductors and 0.22 µF ceramic output capacitors, saving PCB area. |
| Shutdown Current | <1 µA - minimizes battery drain in always-on portable systems during display-off or sleep states. |
| Junction Temp Range | –40°C to +125°C - qualified for industrial and automotive cabin ambient environments with full parameter guarantee. |
| Package Thermal Resistance | 93°C/W (θJA, DFN-8) - allows >350 mW power dissipation at TA = 85°C before reaching TJ = 125°C limit. |
Pinout & Package
The MIC2289-34BML-TR is supplied in an 8-pin 2 mm × 2 mm DFN package (ML suffix) with exposed thermal pad (EP). Pin numbering follows standard DFN top-view orientation with pin 1 marked by dot or delta.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Output & OVP monitor | Connects to output capacitor anode and LED string anode; internally monitors 34 V OVP threshold and clamps SW node during fault. |
| 2 (VIN) | Power supply input | Accepts 2.5–10 V DC; powers internal bias circuitry and gate drive; requires local 1 µF ceramic decoupling. |
| 3 (EN) | Enable control input | Active-high logic input (VEN_H ≥ 1.5 V); pulls VIN current to <1 µA in shutdown; must not be left floating. |
| 4 (AGND) | Analog ground reference | Return for FB, EN, and internal error amplifier; must be routed separately from PGND to avoid noise injection into feedback path. |
| 5 (NC) | No connect | Internally unconnected; no electrical function; may be left unconnected or tied to AGND for mechanical stability. |
| 6 (SW) | Switch node | Collector of internal bipolar transistor; connects to inductor and cathode of internal Schottky diode; carries high di/dt switching current. |
| 7 (FB) | Current sense input | Connects to LED string cathode and external sense resistor; regulates LED current via 95 mV reference (ILED = 95 mV / RFB). |
| 8 (PGND) | Power ground return | Return path for SW node current and internal Schottky cathode; must be low-inductance connection to minimize EMI and voltage spikes. |
| EP | Exposed thermal pad | Internally connected to PGND; must be soldered to large copper pour for thermal conduction and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diode | Eliminates need for external 30 V+ Schottky, reducing BOM count, footprint, and forward-drop losses. |
| 34 V factory-trimmed OVP | Prevents overvoltage damage to LEDs and output capacitor during open-circuit faults without external sensing circuitry. |
| 95 mV precision feedback reference | Enables accurate LED current regulation with minimal power loss in sense resistor across temperature and line/load variations. |
| 1.2 MHz constant-frequency PWM | Ensures predictable EMI spectrum and allows use of miniature passive components while avoiding audible noise. |
| Separate AGND and PGND pins | Reduces ground bounce and improves current regulation accuracy by isolating sensitive analog reference from high-current return paths. |
Applications
| Cell Phone Backlighting | Digital Camera Flash |
|---|---|
Use Scenario: Driving 4–6 series white LEDs in ultra-thin smartphone displays with single-cell Li-ion battery input. IC Role / Device Role / Timing Role: Constant-current boost controller regulating LED string current via FB pin; OVP protects against LED string open failure. Use Value: 95 mV feedback reference minimizes sense resistor power loss, extending battery life by ~8% versus 1.25 V references at 20 mA per string. | Use Scenario: Providing high-intensity pulsed current to 3–4 series white LEDs for camera flash illumination in compact form factor. IC Role / Device Role / Timing Role: High-efficiency boost converter delivering up to 34 V to enable full-brightness flash mode; EN pin enables precise PWM dimming control. Use Value: 1.2 MHz operation allows use of 10 µH inductor and 0.22 µF ceramic capacitor, reducing solution size by 40% vs. 500 kHz alternatives. |
| IP Phone Display Backlight | Portable GPS System UI Lighting |
Use Scenario: Powering monochrome or color LCD backlight in enterprise VoIP handsets operating across –20°C to +70°C ambient. IC Role / Device Role / Timing Role: Stable current source with –40°C to +125°C guaranteed operation; UVLO prevents erratic startup below 2.1 V battery voltage. Use Value: <1 µA shutdown current ensures negligible battery drain during standby, supporting >1-year shelf life on primary lithium cells. | Use Scenario: Illuminating high-contrast TFT display in automotive-grade portable navigation devices with wide input voltage range. IC Role / Device Role / Timing Role: Boost regulator tolerant of 2.5–10 V input transients; 34 V OVP accommodates 8-LED strings for maximum brightness in sunlight. Use Value: DFN-8 package with 93°C/W θJA enables full 20 mA per string operation at 85°C ambient without derating or thermal throttling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409QMY/NOPB | External MOSFET driver; no integrated Schottky; adjustable OVP via resistor divider; 1.6 MHz max switching frequency. | Requires external high-VF Schottky and OVP circuitry; better suited for >1 A LED currents and custom OVP thresholds. | Select when higher output current (>700 mA) or programmable OVP is required; adds 3–4 components but offers greater flexibility. |
| TPS61165DRVR | Integrated MOSFET; no internal Schottky; fixed 40 V OVP; 1.2 MHz switching; 1.6 V to 6.5 V input range. | Narrower input range excludes 9 V battery or 2-cell alkaline use; 40 V OVP exceeds MIC2289-34BML-TR's 34 V, increasing capacitor voltage rating requirement. | Choose for cost-sensitive designs where 40 V OVP is acceptable and input is strictly single-cell Li-ion or 3.3 V rail; smaller solution size but less input flexibility. |
Compared with LM3409QMY/NOPB and TPS61165DRVR, the MIC2289-34BML-TR provides the lowest BOM count for 34 V OVP-compliant LED strings, integrates both Schottky diode and precision 95 mV reference, and supports the widest input range (2.5–10 V) among the three-making it optimal for multi-chemistry battery-powered portable devices.
Availability
MIC2289-34BML-TR is available at Aetrix Electronics and suitable for cell phone backlighting, digital camera flash circuits, and IP phone display lighting requiring stable component supply and guaranteed long-term production continuity.
Supply support for MIC2289-34BML-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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and timing solutions, with global design, manufacturing, and support infrastructure.
The MIC2289 product line is designed specifically for space-constrained, battery-powered white LED backlighting and flash applications, emphasizing integration, efficiency, and robust fault protection in portable consumer electronics.
FAQ
What is the exact OVP threshold of the MIC2289-34BML-TR?
The MIC2289-34BML-TR has a factory-trimmed output overvoltage protection threshold of 30 V minimum, 32.5 V typical, and 34 V maximum. This 34 V OVP option is permanently configured in the die and cannot be adjusted externally. It activates during open-LED conditions to clamp the output voltage and protect both the IC and external output capacitor, as verified in the Electrical Characteristics table on page 3 of DS20006207A.
Which package does the MIC2289-34BML-TR use, and what are its thermal characteristics?
The MIC2289-34BML-TR uses the 8-pin 2 mm × 2 mm DFN package (ML suffix) with exposed thermal pad. Its junction-to-ambient thermal resistance (θJA) is 93°C/W under standard JEDEC test conditions. This allows sustained operation at up to 350 mW power dissipation when ambient temperature is 85°C, making it suitable for thermally constrained handheld devices without forced airflow.
Can the MIC2289-34BML-TR drive more than six white LEDs in series?
Yes-the MIC2289-34BML-TR can safely drive up to eight white LEDs in series, assuming 3.2 V forward voltage per LED (25.6 V total), with 8.4 V headroom remaining before reaching the 34 V OVP limit. The datasheet confirms suitability for 7–8 LED strings in Table 5-1, recommending 0.22 µF/35 V or 0.27 µF/50 V output capacitors to maintain reliability under worst-case forward voltage variation and temperature drift.
How does the MIC2289-34BML-TR achieve high efficiency with low feedback voltage?
The MIC2289-34BML-TR achieves high efficiency by using a precision 95 mV feedback reference, which reduces power dissipation in the external current-sense resistor (P = I² × R). For a 20 mA LED current, a 4.75 Ω resistor dissipates only 19 µW versus 312 µW with a conventional 1.25 V reference-cutting sense loss by over 94%. This directly extends battery runtime in portable applications where the MIC2289-34BML-TR is deployed.
Is the MIC2289-34BML-TR RoHS compliant and lead-free?
Yes, the MIC2289-34BML-TR is RoHS compliant and lead-free. Per the Product Identification System section (page 19), the "Y" suffix denotes extended temperature range (–40°C to +125°C) and RoHS compliance, and the DFN-8 package carries the Pb-free JEDEC® matte tin (Sn) designation. The "TR" reel packaging further confirms industrial-grade environmental compliance per Microchip's published specifications.
MIC2289-34BML-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad, 8-MLF®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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)
MIC2289-34BML-TR FAQ
1.How can I place an order for MIC2289-34BML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2289-34BML-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 MIC2289-34BML-TR reliable?
The price and inventory of MIC2289-34BML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2289-34BML-TR is usually 5 days.
3.What payment methods are accepted for MIC2289-34BML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2289-34BML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2289-34BML-TR?
MIC2289-34BML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2289-34BML-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 MIC2289-34BML-TR?
For technical support, including MIC2289-34BML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2289-34BML-TR requirements.
6.How does Aetrix verify that MIC2289-34BML-TR is sourced from the original manufacturer or authorized distributors?
All MIC2289-34BML-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 MIC2289-34BML-TR meets industry standards.
7.What is the process for return or replacement of MIC2289-34BML-TR?
All MIC2289-34BML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2289-34BML-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 MIC2289-34BML-TR part is unused and in its original packaging.
Return procedure for MIC2289-34BML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC2289-34BML-TR Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
