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Microchip Technology MIC2291BD5-TR
- Part No.:
- MIC2291BD5-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MIC2291BD5-TR.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,928
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Product details
Overview
MIC2291BD5-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 (OVP), and operation from 2.5V–10V input to drive 3-series white LEDs at 100mA in mobile camera modules.
For engineers reviewing the MIC2291BD5-TR datasheet, MIC2291BD5-TR pinout, MIC2291BD5-TR application, or MIC2291BD5-TR equivalent, key selection criteria include guaranteed 1.2A switch current, thin SOT23-5 package compatibility, 1.2MHz fixed-frequency operation for low EMI, and OVP-limited output for Li-ion-powered flash circuits.
Technical Context
The MIC2291BD5-TR implements constant-frequency current-mode PWM control using an internal bipolar switch, slope-compensated ramp generator, and gm error amplifier referenced to 95mV. It operates exclusively in boost topology with internal 1.2MHz oscillator and no OVP pin - unlike MLF variants, OVP is disabled in this D5 version.
It supports PWM dimming via EN pin (logic-high enable ≥1.5V, shutdown current ≤1µA) and continuous dimming via FB pin voltage injection. UVLO triggers at 2.1V typical, and thermal shutdown activates at 150°C with 10°C hysteresis.
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. |
| Oscillator Frequency | 1.2MHz ±12.5% - allows use of small 10µH inductors and ceramic capacitors. |
| Feedback Voltage | 95mV ±5% - minimizes power loss in current-sense resistor and reduces total output headroom. |
| Shutdown Current | ≤1µA - preserves battery life during flash standby in portable devices. |
| UVLO Threshold | 2.1V typical - prevents unstable operation during Li-ion discharge below 3.0V. |
| Junction Temp Range | –40°C to +125°C - qualified for automotive cabin and industrial handheld environments. |
Pinout & Package
Package: 5-pin Thin SOT23 (D5), 1.3mm height, RoHS-compliant standard lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch node | Internal bipolar collector output - connects to inductor and Schottky diode anode; rated to 34V max. |
| 2 (GND) | Ground return | Common reference for power and control circuitry; ties to PCB ground plane. |
| 3 (FB) | Feedback input | Senses voltage across external current-set resistor; regulates LED current to ILED = 95mV / RSET. |
| 4 (EN) | Enable input | Active-high logic control (≥1.5V enables); pulls <1µA when disabled - ideal for microcontroller GPIO drive. |
| 5 (VIN) | Supply input | Accepts 2.5–10V DC input; bypassed with ≥1µF ceramic capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with ceramic capacitors | Eliminates need for electrolytic or tantalum output caps - improves reliability and saves board space. |
| <1% line and load regulation | Maintains consistent LED brightness across battery voltage sag and varying LED forward voltage. |
| Overtemperature protection | Shuts down at 150°C junction temperature with 10°C hysteresis - prevents thermal runaway during sustained flash bursts. |
| UVLO with hysteresis | Ensures clean startup/shutdown at battery voltages below 2.4V - avoids erratic flash triggering. |
| Low-profile Thin SOT23-5 | 0.95mm max height - fits under compact camera module assemblies in smartphones and digital cameras. |
Applications
| Smartphone Camera Flash | Digital Still Camera Module |
|---|---|
|
Use Scenario: High-intensity, short-duration white LED flash for image capture in low-light conditions. IC Role / Device Role / Timing Role: Boost regulator providing regulated 100mA current to 3-series white LEDs from single Li-ion cell. Use Value: 1.2A switch current and 1.2MHz switching enable compact 10µH inductor and 1µF ceramic output cap - reducing BOM count and footprint by >30% vs. lower-frequency alternatives. |
Use Scenario: Synchronized flash illumination during high-resolution still capture in consumer digital cameras. IC Role / Device Role / Timing Role: Constant-current LED driver with PWM dimming control via microcontroller EN signal. Use Value: ≤1µA shutdown current extends standby battery life between shots; 95mV feedback reference minimizes heat in current-sense resistor during repeated flash cycles. |
| IP Phone Visual Alert | Portable LED Flashlight |
|
Use Scenario: Bright visual notification for incoming calls or voicemail on VoIP desk phones. IC Role / Device Role / Timing Role: Efficient boost converter powering multi-LED array from 3.3V or 5V system rail. Use Value: Fixed 1.2MHz frequency ensures predictable EMI profile - simplifies FCC/CE compliance in communication equipment. |
Use Scenario: High-brightness emergency lighting in handheld battery-powered flashlights. IC Role / Device Role / Timing Role: Current-regulated boost driver supporting 3–4 white LEDs in series from alkaline or Li-ion sources. Use Value: –40°C to +125°C operating range ensures reliable flash output in outdoor environments; UVLO prevents dim or flickering light as batteries deplete. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED flash boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61310DSKR | 1.5A switch current, 1.5MHz switching, 0.5V minimum input, no integrated OVP. | Supports lower-input-voltage systems (e.g., 2xAA alkaline), but lacks OVP - requires external clamping for 34V-capable designs. | Select TPS61310DSKR when input can drop below 2.5V or higher peak current is needed; verify external OVP if output exceeds 15V. |
| MAX8630YETA+ | 1.0A switch current, 2.5MHz switching, 900mV feedback voltage, integrated soft-start. | Higher feedback voltage increases sense resistor power loss; 2.5MHz allows smaller passives but raises EMI filtering complexity. | Choose MAX8630YETA+ only when ultra-small inductor size is critical and thermal budget permits higher I²R loss in RSET. |
Compared with MIC2291BD5-TR, the TPS61310DSKR offers wider input range and higher current but no OVP, while the MAX8630YETA+ trades efficiency for size reduction - MIC2291BD5-TR remains optimal for cost-sensitive, Li-ion-based flash where 15V OVP and 95mV feedback deliver best-in-class thermal and layout efficiency.
Availability
MIC2291BD5-TR is available at Aetrix Electronics and suitable for smartphone camera flash, digital still camera modules, and IP phone visual alerts requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC2291BD5-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 drivers in portable imaging systems - prioritizing low quiescent current, minimal external components, and robust thermal performance in thin SOT23 packages.
FAQ
What is the maximum output voltage supported by the MIC2291BD5-TR?
The MIC2291BD5-TR does not include an OVP pin and relies on external component ratings for overvoltage protection. Its switch node is rated to 34V, and the datasheet specifies operation up to 34V output - however, safe design requires selecting external diodes, capacitors, and resistors rated for ≥34V. The MIC2291BD5-TR itself has no internal OVP clamp.
Does the MIC2291BD5-TR support PWM dimming, and how is it implemented?
Yes, the MIC2291BD5-TR supports PWM dimming via its EN pin: applying a logic-level PWM signal (100Hz–10kHz) toggles the regulator on/off, delivering average LED current proportional to duty cycle. This method achieves high efficiency because both the MIC2291BD5-TR and LEDs draw zero current during off periods - confirmed in the Functional Description section of the datasheet.
What is the recommended inductor value for the MIC2291BD5-TR, and why?
The datasheet recommends a 10µH inductor for the MIC2291BD5-TR as the optimal balance of efficiency, stability, size, and cost. At 1.2MHz switching, this value yields manageable peak-to-peak ripple current while avoiding right-half-plane zero instability - verified in the Application Information section, which notes that larger inductors require increased output capacitance to maintain loop stability.
Can the MIC2291BD5-TR operate from a 1.5V input source?
No, the MIC2291BD5-TR cannot operate from 1.5V. Its absolute minimum input voltage is 2.5V, and UVLO disables operation below ~2.1V. Attempting to power the MIC2291BD5-TR from 1.5V will prevent startup and may cause erratic behavior - it is designed exclusively for 2.5–10V inputs such as single-cell Li-ion (3.0–4.2V) or regulated 3.3V/5V rails.
How is LED current set in the MIC2291BD5-TR, and what is the formula?
LED current in the MIC2291BD5-TR is set by a single external resistor connected between FB and GND. The formula is ILED = 95mV / RSET, where 95mV is the internal feedback reference voltage. For example, a 950Ω resistor sets 100mA LED current - directly stated in the Functional Description and confirmed in the Typical Application schematic.
MIC2291BD5-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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:
- -
- 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:
- TSOT-23-5
MIC2291BD5-TR FAQ
1.How can I place an order for MIC2291BD5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2291BD5-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 MIC2291BD5-TR reliable?
The price and inventory of MIC2291BD5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2291BD5-TR is usually 5 days.
3.What payment methods are accepted for MIC2291BD5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2291BD5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2291BD5-TR?
MIC2291BD5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2291BD5-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 MIC2291BD5-TR?
For technical support, including MIC2291BD5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2291BD5-TR requirements.
6.How does Aetrix verify that MIC2291BD5-TR is sourced from the original manufacturer or authorized distributors?
All MIC2291BD5-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 MIC2291BD5-TR meets industry standards.
7.What is the process for return or replacement of MIC2291BD5-TR?
All MIC2291BD5-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2291BD5-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 MIC2291BD5-TR part is unused and in its original packaging.
Return procedure for MIC2291BD5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC2291BD5-TR Tags
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