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Microchip Technology MIC2291-15YML-TR
- Part No.:
- MIC2291-15YML-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 8-VFDFN Exposed Pad, 8-MLF®
- Datasheet:
-
MIC2291-15YML-TR.pdf
- Description:
- IC LED DRVR RGLTR PWM 1.2A 8MLF
- Quantity:
- Payment:
- Shipping:
Inventory:18,479
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Product details
Overview
MIC2291-15YML-TR from Micrel is a 1.2A, 1.2MHz PWM boost regulator optimized for white LED photo flash applications, featuring 95mV feedback voltage, 15V overvoltage protection, and operation from 2.5V to 10V input - enabling efficient 3-LED series drive at 100mA in compact mobile devices.
For engineers reviewing the MIC2291-15YML-TR datasheet, MIC2291-15YML-TR pinout, MIC2291-15YML-TR application, or MIC2291-15YML-TR equivalent, key selection considerations include OVP threshold (15V), MLF-8 package thermal resistance (93°C/W), shutdown current (≤1µA), and compatibility with ceramic output capacitors in space-constrained flash LED designs.
Technical Context
The MIC2291-15YML-TR implements constant-frequency current-mode PWM control using an internal 1.2MHz oscillator, slope-compensated ramp generator, and gm error amplifier referenced to 95mV. Its bipolar switch delivers 1.2A peak current with 550mV saturation voltage at 1A.
OVP functionality is implemented via dedicated OVP pin (Pin 1) in the MLF-8 package only, clamping output at 13–16V (typical 14V). The device integrates UVLO (2.1V typ), thermal shutdown (150°C), and operates across –40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 10V - supports single-cell Li-ion (3.0–4.2V) without external regulation. |
| Switch Current Limit | 1.2A - enables driving 3× white LEDs in series at 100mA with margin. |
| Feedback Voltage | 95mV ±5% - minimizes I²R loss in current-sense resistor and reduces total output headroom. |
| OVP Threshold | 15V (MIC2291-15YML-TR) - protects switch node and external diode against overvoltage during FB fault conditions. |
| Shutdown Current | ≤1µA - preserves battery life in standby mode of portable flash systems. |
| Oscillator Frequency | 1.2MHz (1.05–1.35MHz) - allows use of small 10µH inductor and 0.22µF ceramic capacitor. |
| Thermal Resistance θJA | 93°C/W (MLF-8) - supports 1.2A switching in thin-profile handheld enclosures with minimal heatsinking. |
Pinout & Package
The MIC2291-15YML-TR is housed in an 8-pin, 2mm × 2mm MLF® package with exposed thermal pad (EP = GND), rated for –40°C to +125°C junction temperature and compatible with Pb-free reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OVP (Pin 1) | Overvoltage protection input | Connects to output node; disables SW when VOVP exceeds 14V (13–16V range), preventing uncontrolled rise during FB open/short faults. |
| VIN (Pin 2) | Power supply input | Accepts 2.5–10V DC; requires ≥1µF ceramic capacitor placed near pin for low-impedance decoupling. |
| EN (Pin 3) | Enable logic input | Active-high (≥1.5V); pulls <1µA when low; enables PWM dimming when driven by external 100Hz–10kHz signal. |
| AGND (Pin 4) | Analog ground reference | Separate ground for FB and OVP sensing; must be routed to PGND at single point near EP to minimize noise coupling. |
| SW (Pin 5) | Switch node output | Bipolar collector output; switches up to 1.2A; connects to inductor and Schottky diode anode. |
| FB (Pin 6) | Current-sense feedback input | Senses voltage across external RSET; regulates LED current as ILED = 95mV / RSET. |
| PGND (Pin 8) | Power ground return | High-current return path for SW and inductor; ties to EP for thermal conduction and low-inductance grounding. |
| NC (Pin 7) | No connect | Not internally bonded; must remain unconnected on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| 15V overvoltage protection | Dedicated OVP pin enables fail-safe shutdown if FB opens or shorts, protecting IC and external components without external circuitry. |
| 95mV feedback reference | Reduces power dissipation in current-sense resistor by >90% vs. conventional 1.25V references, improving efficiency and thermal performance. |
| Stable with ceramic capacitors | Eliminates need for bulky electrolytic or tantalum output caps; supports compact, high-reliability flash LED designs. |
| 1.2MHz fixed-frequency PWM | Enables use of 10µH inductors and sub-1µF ceramics, reducing board area by ~50% vs. 500kHz alternatives. |
| Ultra-low shutdown current | ≤1µA shutdown current extends battery runtime in always-on mobile devices between flash events. |
Applications
| Smartphone Photo Flash | Digital Camera Auxiliary Flash |
|---|---|
Use Scenario: High-intensity brief illumination for smartphone rear/front cameras in low-light conditions. IC Role / Device Role / Timing Role: Boost regulator providing regulated 100mA current to 3× white LEDs in series during 100–500ms flash pulse. Use Value: 15V OVP prevents damage during LED string open-circuit faults; 1.2MHz switching enables ultra-thin camera module integration. | Use Scenario: Secondary flash unit in compact digital cameras requiring consistent color temperature and brightness. IC Role / Device Role / Timing Role: Constant-current LED driver with precise 95mV feedback ensuring stable luminance across battery discharge cycle. Use Value: <1% load regulation maintains flash intensity from 3.0V to 4.2V input; thermal shutdown protects during repeated burst firing. |
| IP Phone Visual Alert | Portable LED Flashlight |
Use Scenario: Visual ring indicator using white LEDs on VoIP desk phones with USB or PoE power. IC Role / Device Role / Timing Role: Efficient boost converter powering 2–3 LEDs from 5V USB input with enable-controlled pulsing. Use Value: 2.5–10V input range accommodates both 5V USB and 3.7V Li-ion backup; EN pin supports software-triggered visual alerts. | Use Scenario: Rechargeable handheld flashlight requiring high lumen output and long runtime per charge. IC Role / Device Role / Timing Role: Primary LED driver converting single Li-ion cell to sufficient voltage for 3-LED series string. Use Value: 1.2A switch current supports >100mA continuous drive; 93°C/W θJA enables reliable operation in sealed plastic housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED flash driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61310DSKR | 1.5A switch, 1.5MHz, 36V OVP only, no dedicated OVP pin - uses internal comparator with external resistor divider. | Lacks pin-level OVP fault response; requires additional components for equivalent safety during FB faults. | Choose TPS61310DSKR only if 36V OVP suffices and board space allows external OVP circuitry. |
| MAX1561ETE+ | 1.2A switch, 1MHz, 16V OVP, 100mV feedback, but uses external MOSFET instead of integrated bipolar switch. | Requires external high-side N-MOSFET and gate driver; higher BOM count and layout complexity. | Select MAX1561ETE+ when higher efficiency at light loads or discrete switch control is required. |
Compared with TPS61310DSKR and MAX1561ETE+, the MIC2291-15YML-TR provides integrated 15V OVP with dedicated pin and bipolar switch - simplifying layout, reducing component count, and enhancing fault safety in space-constrained flash modules without compromising peak current capability.
Availability
MIC2291-15YML-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, Pb-free compliance, and guaranteed 15V overvoltage protection.
Supply support for MIC2291-15YML-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; known for high-performance power management and timing solutions.
The MIC2291 product line was designed specifically for compact, high-efficiency white LED photo flash applications in portable electronics, emphasizing integrated protection, low quiescent current, and minimal external component count.
FAQ
What is the function of the OVP pin on the MIC2291-15YML-TR?
The OVP pin (Pin 1) on the MIC2291-15YML-TR monitors output voltage and forces the internal switch off when voltage exceeds 13–16V (typical 14V), preventing destructive overvoltage during feedback loop faults such as open-circuit or shorted FB connections. This dedicated pin is exclusive to MLF-package variants like the MIC2291-15YML-TR and is not present in SOT23 versions.
How do I calculate the feedback resistor value for a target LED current with the MIC2291-15YML-TR?
Use the formula RSET = 95mV / ILED, where ILED is the desired forward current. For example, to set 100mA LED current, RSET = 0.095V / 0.1A = 950Ω. The MIC2291-15YML-TR's 95mV reference minimizes power loss and thermal drift compared to higher-voltage references.
Does the MIC2291-15YML-TR support PWM dimming, and how is it implemented?
Yes, the MIC2291-15YML-TR supports PWM dimming via its EN pin: applying a 100Hz–10kHz logic-level PWM signal toggles the regulator on/off, proportionally controlling average LED current while maintaining full brightness during active pulses. This method achieves high efficiency since the MIC2291-15YML-TR draws ≤1µA in shutdown state.
What is the maximum recommended output voltage for the MIC2291-15YML-TR?
The MIC2291-15YML-TR is rated for 15V overvoltage protection and has a maximum switch voltage rating of 34V. However, its OVP threshold is fixed at 13–16V (typical 14V), so sustained output above 15V will trigger shutdown. Designers should limit nominal output to ≤12V to maintain margin below the OVP trip point and ensure reliable operation.
Can the MIC2291-15YML-TR operate from a single-cell Li-ion battery throughout its discharge curve?
Yes, the MIC2291-15YML-TR operates from 2.5V to 10V input, fully covering the 3.0–4.2V range of a discharging single-cell Li-ion battery. Its <1% load and line regulation ensures stable LED current across this range, and UVLO (2.1V typical) prevents malfunction at end-of-discharge voltages.
MIC2291-15YML-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:
- 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)
MIC2291-15YML-TR FAQ
1.How can I place an order for MIC2291-15YML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2291-15YML-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 MIC2291-15YML-TR reliable?
The price and inventory of MIC2291-15YML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2291-15YML-TR is usually 5 days.
3.What payment methods are accepted for MIC2291-15YML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2291-15YML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2291-15YML-TR?
MIC2291-15YML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2291-15YML-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 MIC2291-15YML-TR?
For technical support, including MIC2291-15YML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2291-15YML-TR requirements.
6.How does Aetrix verify that MIC2291-15YML-TR is sourced from the original manufacturer or authorized distributors?
All MIC2291-15YML-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 MIC2291-15YML-TR meets industry standards.
7.What is the process for return or replacement of MIC2291-15YML-TR?
All MIC2291-15YML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2291-15YML-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 MIC2291-15YML-TR part is unused and in its original packaging.
Return procedure for MIC2291-15YML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC2291-15YML-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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