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Microchip Technology MIC2291-15BML-TR
- Part No.:
- MIC2291-15BML-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 8-VFDFN Exposed Pad, 8-MLF®
- Datasheet:
-
MIC2291-15BML-TR.pdf
- Description:
- IC LED DRVR RGLTR PWM 1.2A 8MLF
- Quantity:
- Payment:
- Shipping:
Inventory:3,408
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Product details
Overview
MIC2291-15BML-TR from Micrel is a 1.2MHz PWM boost regulator optimized for white LED photo flash applications, featuring 1.2A switch current, 95mV feedback voltage, and 15V overvoltage protection. It drives three-series white LEDs at 100mA from a single Li-ion cell (3–4.2V), eliminating ballast resistors while maintaining high brightness in compact mobile devices.
For engineers reviewing the MIC2291-15BML-TR datasheet, MIC2291-15BML-TR pinout, MIC2291-15BML-TR application, or MIC2291-15BML-TR equivalent, key selection criteria include OVP threshold matching, MLF-8 package thermal performance, constant-frequency current-mode control stability, and low-quiescent shutdown current for battery-sensitive flash systems.
Technical Context
The MIC2291-15BML-TR implements a constant-frequency, current-mode PWM control architecture with a 1.2MHz oscillator, slope-compensated ramp generator, and gm error amplifier. Its internal bipolar switch delivers up to 1.2A peak current with 550mV saturation voltage at 1A, enabling efficient energy transfer in discontinuous conduction mode for LED flash bursts.
It uses a 95mV precision feedback reference to minimize power loss in the external current-sense resistor and integrates dedicated OVP functionality tied to the OVP pin-active only in the 8-pin MLF package-to clamp output at 15V and prevent uncontrolled voltage rise during FB pin fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 10V - supports single-cell Li-ion (3–4.2V) and dual-cell alkaline/NiMH inputs without external regulation. |
| Switch Current Limit | 1.2A - guarantees reliable drive of 3× white LEDs in series at 100mA under worst-case input and temperature conditions. |
| Oscillator Frequency | 1.2MHz (typ) - enables use of small 10µH inductors and 0.22µF ceramic capacitors, reducing PCB area by >40% vs. 500kHz designs. |
| Feedback Voltage | 95mV ±5% - lowers I²R loss in current-sense resistor by ~70% versus 1.25V references, extending battery life per flash event. |
| OVP Threshold | 15V (±1V) - protects downstream components when driving 3× white LEDs (VF ≈ 9–10.5V) plus headroom and transient overshoot. |
| Shutdown Current | 1µA (max) - minimizes standby drain on primary battery during idle periods between flash activations. |
| Junction Temp Range | –40°C to +125°C - ensures stable operation in handheld device enclosures exposed to ambient and self-heating conditions. |
Pinout & Package
The MIC2291-15BML-TR is housed in an 8-pin, 2mm × 2mm MLF® package with exposed thermal pad (EP), offering θJA = 93°C/W for sustained flash duty cycles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OVP) | Overvoltage protection input | Connects to output node; triggers shutdown if VOVP ≥15V, preventing destructive overvoltage during FB open-circuit faults. |
| 2 (VIN) | Power supply input | Accepts 2.5–10V DC; requires ≥1µF local ceramic decoupling placed near pin for EMI suppression and transient response. |
| 3 (EN) | Enable logic input | Active-high (≥1.5V); pulls <1µA when low; used for PWM dimming or system-level flash enable control. |
| 4 (AGND) | Analog ground reference | Internally connected to GND but isolated from PGND to reduce noise coupling into FB and OVP sensing paths. |
| 5 (NC) | No connect | Unbonded die pad; must remain floating-no PCB trace or solder mask opening required. |
| 6 (FB) | Current-sense feedback input | 95mV reference node; connects cathode of LED string and sense resistor to ground-sets LED current as ILED = 95mV/RSENSE. |
| 7 (SW) | Switch node output | Drives external inductor; swings from GND to VOUT; requires low-inductance Schottky catch diode (e.g., 1A/40V) to complete boost path. |
| 8 (PGND) | Power ground return | High-current return path for switch and inductor; must be routed separately from AGND and tied at single point near EP pad. |
| EP | Exposed thermal pad | Internally connected to GND; must be soldered to ≥100mm² copper pour for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency current-mode control | Enables predictable EMI filtering and stable loop compensation without subharmonic oscillation across load and input ranges. |
| 15V overvoltage protection (OVP) | Hardware-level fault response that disables SW within microseconds when output exceeds 15V-critical for protecting LEDs and camera sensors. |
| 95mV feedback reference | Reduces sense resistor power loss to <10mW at 100mA, enabling 0402/0603 resistors without derating or thermal drift concerns. |
| Stable with ceramic output capacitors | Eliminates need for electrolytic or tantalum capacitors-improves reliability, reduces size, and avoids aging-related capacitance loss in portable devices. |
| –40°C to +125°C operation | Validated performance across full automotive interior and industrial handheld temperature ranges without derating or external thermal management. |
Applications
| Smartphone Photo Flash | Digital Camera Auxiliary Flash |
|---|---|
Use Scenario: High-intensity burst illumination for smartphone rear/front cameras in low-light conditions, synchronized with image capture timing. IC Role / Device Role / Timing Role: Boost regulator and LED current controller; provides precise 100mA flash current with <1% line/load regulation and sub-10µs enable response. Use Value: Enables consistent color temperature and luminance across battery voltage range (3–4.2V), eliminating brightness drop during flash sequences. | Use Scenario: Compact auxiliary flash module in DSLR/mirrorless camera accessories or action cams requiring fast recharge and low standby drain. IC Role / Device Role / Timing Role: Primary LED driver with integrated OVP; handles rapid on/off cycling (≤100ms interval) and thermal foldback during extended use. Use Value: 15V OVP prevents damage to sensitive CMOS image sensors during LED string open-circuit failure modes. |
| IP Phone Visual Alert | Industrial Handheld Barcode Scanner |
Use Scenario: Visual ring indicator or message alert using white LEDs embedded in VoIP desk phone housing. IC Role / Device Role / Timing Role: Low-duty-cycle flash driver; activated via EN pin PWM at 1–5Hz with 10–20% duty cycle for visibility without overheating. Use Value: 1µA shutdown current extends backup battery life beyond 6 months in always-on enterprise deployments. | Use Scenario: Illumination assist for 2D barcode scanning in ruggedized handheld terminals operating in warehouses or field environments. IC Role / Device Role / Timing Role: Robust LED driver tolerant of wide input (2.5–10V) and ambient temperature extremes (–40°C to +85°C). Use Value: –40°C to +125°C junction rating ensures reliable flash activation even after cold-soak or prolonged operation in hot industrial enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED flash driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8630Y | 1.25V feedback reference; 1.5A switch current; no integrated OVP; uses external MOSFET | Requires external high-side switch and separate OVP circuit; higher BOM count and layout complexity | Select when higher peak current (>1.2A) or programmable OVP threshold is required; not drop-in compatible due to different pinout and control architecture. |
| TPS61310DRCR | 1.5A switch current; 0.8V feedback; integrated 34V OVP; 2.5MHz switching frequency | Higher frequency allows smaller inductors but increases EMI sensitivity; OVP fixed at 34V-not adjustable to 15V | Select when board space is constrained and 34V OVP suffices; requires redesign of feedback network and compensation due to different reference and loop characteristics. |
Compared with MAX8630Y and TPS61310DRCR, the MIC2291-15BML-TR offers a unique combination of 15V OVP, 95mV reference, and MLF-8 package thermal performance-making it optimal for cost-sensitive, space-constrained smartphone flash modules where precise 15V clamping and minimal sense-resistor loss are critical.
Availability
MIC2291-15BML-TR is available at Aetrix Electronics and suitable for smartphone photo flash, digital camera auxiliary lighting, and IP phone visual alert systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC2291-15BML-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 analog and mixed-signal semiconductor company founded in 1978, acquired by Microchip Technology in 2015. It specialized in power management, timing, and interface ICs for communications and consumer electronics.
The MIC2291 product line was designed specifically for high-efficiency, compact white LED photo flash drivers in portable devices-emphasizing low quiescent current, integrated protection, and minimal external component count.
FAQ
What is the maximum output voltage supported by the MIC2291-15BML-TR?
The MIC2291-15BML-TR features 15V overvoltage protection (OVP) tied to its OVP pin, limiting regulated output to ≤15V under normal operation. While the internal switch can withstand up to 34V, the OVP function actively shuts down the switch if output exceeds 15V ±1V-ensuring safe operation for 3× white LED strings (typically 9–10.5V) plus margin. This OVP threshold is fixed and not adjustable.
Does the MIC2291-15BML-TR require an external Schottky diode?
Yes, the MIC2291-15BML-TR requires an external Schottky diode connected between the SW pin and output capacitor. The internal bipolar transistor functions as a low-side switch, so the diode completes the boost converter path. A 1A/40V Schottky (e.g., RB055LAM-40) is recommended to minimize forward voltage drop and reverse recovery losses, directly impacting efficiency and thermal performance in flash applications.
How is LED current set on the MIC2291-15BML-TR?
LED current is set by a single external resistor connected between the FB pin and ground. Using the MIC2291-15BML-TR's 95mV internal reference, current is calculated as ILED = 95mV / RSENSE. For example, a 950Ω resistor sets 100mA. The FB pin must be connected to the LED string cathode; incorrect routing causes regulation failure or OVP triggering.
Can the MIC2291-15BML-TR operate from a 1.5V alkaline cell?
No-the MIC2291-15BML-TR has a minimum input voltage of 2.5V per its Absolute Maximum Ratings and Operating Ratings. A single 1.5V alkaline cell falls below this threshold and cannot power the device. It is designed for single-cell Li-ion (3–4.2V), two-cell alkaline/NiMH (2.5–3.2V), or regulated 3.3V/5V supplies meeting the 2.5–10V input range.
What is the purpose of the NC pin on the MIC2291-15BML-TR?
The NC (No Connect) pin on the MIC2291-15BML-TR is Pin 5 in the 8-pin MLF package and has no internal connection to the die. It must remain unconnected-no trace, solder, or pull-up/down component should be attached. Leaving it floating avoids unintended parasitic coupling or ESD discharge paths that could affect OVP or FB accuracy.
MIC2291-15BML-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:
- 16V
- Current - Output / Channel:
- 1.2A (Switch)
- Frequency:
- 1.2MHz
- Dimming:
- Analog, PWM
- Applications:
- Camera Flash
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MLF® (2x2)
MIC2291-15BML-TR FAQ
1.How can I place an order for MIC2291-15BML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2291-15BML-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 MIC2291-15BML-TR reliable?
The price and inventory of MIC2291-15BML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2291-15BML-TR is usually 5 days.
3.What payment methods are accepted for MIC2291-15BML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2291-15BML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2291-15BML-TR?
MIC2291-15BML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2291-15BML-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 MIC2291-15BML-TR?
For technical support, including MIC2291-15BML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2291-15BML-TR requirements.
6.How does Aetrix verify that MIC2291-15BML-TR is sourced from the original manufacturer or authorized distributors?
All MIC2291-15BML-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 MIC2291-15BML-TR meets industry standards.
7.What is the process for return or replacement of MIC2291-15BML-TR?
All MIC2291-15BML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2291-15BML-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 MIC2291-15BML-TR part is unused and in its original packaging.
Return procedure for MIC2291-15BML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC2291-15BML-TR Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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BCR420UE6433HTMA1
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LYT1604D-TL
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HV9910CLG-G
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CL2N8-G
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BCR421UW6-7
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