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Microchip Technology MIC2291YD5-TR
- Part No.:
- MIC2291YD5-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MIC2291YD5-TR.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,563
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Product details
Overview
MIC2291YD5-TR from Micrel is a 1.2A, 1.2MHz PWM boost regulator optimized for white LED photo flash applications, featuring 95mV feedback voltage, 2.5V–10V input range, and 34V max output capability. It drives three-series white LEDs at 100mA from a single Li-ion cell (3V–4.2V), eliminating ballast resistors while maintaining high brightness in compact mobile devices.
For engineers reviewing the MIC2291YD5-TR datasheet, MIC2291YD5-TR pinout, MIC2291YD5-TR application, or MIC2291YD5-TR equivalent, key selection criteria include its Thin SOT23-5 Pb-free package, 1.2A switch current rating, OVP absence (vs. MLF variants), and suitability for space-constrained flash LED drivers requiring low quiescent current (1µA shutdown) and stable ceramic capacitor operation.
Technical Context
The MIC2291YD5-TR implements constant-frequency current-mode PWM control with a 1.2MHz oscillator, slope-compensated ramp generator, and gm error amplifier. Its internal bipolar switch delivers 1.2A peak current with 550mV saturation voltage at 1.0A, enabling efficient energy transfer in discontinuous conduction mode for LED flash bursts.
Feedback regulation uses a precise 95mV reference to set LED current via an external sense resistor, minimizing power loss and allowing minimal total output voltage. The device integrates UVLO (2.1V typ), overtemperature shutdown (150°C), and <1% line/load regulation-critical for battery-powered imaging systems where input voltage varies across discharge cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 10V - supports single-cell Li-ion (3V–4.2V) and multi-cell alkaline inputs without external LDO pre-regulation. |
| Switch Current Limit | 1.2A - enables driving 3× white LEDs in series at 100mA with margin for transient surge during flash activation. |
| Oscillator Frequency | 1.2MHz (typ) - allows use of small 10µH inductors and 0.22µF/1µF ceramic capacitors, reducing PCB area by >40% vs. 500kHz designs. |
| Feedback Voltage | 95mV ±5% - lowers I²R loss in current-sense resistor, improving efficiency and thermal performance in thin-profile handhelds. |
| Shutdown Current | 1µA (max) - extends standby battery life in camera modules where flash is infrequently activated. |
| Junction Temp Range | –40°C to +125°C - ensures reliable operation in automotive cabin cameras and industrial handheld scanners. |
| Line/Load Regulation | <1% - maintains consistent LED brightness despite battery voltage sag or load variation during flash pulse. |
Pinout & Package
Package: 5-pin Thin SOT23 (D5), 1.3mm height, Pb-free matte tin lead finish, θJA = 256°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch node (output) | Internal bipolar collector node; connects to inductor and Schottky diode anode - must be routed with short, low-inductance trace to minimize switching noise. |
| 2 (GND) | Ground return | Common analog/power ground reference; ties to exposed pad on bottom of package for thermal dissipation. |
| 3 (FB) | Feedback input | Senses voltage across external current-set resistor; cathode of LED string connects here to close current regulation loop. |
| 4 (EN) | Enable input | Logic-controlled shutdown: ≥1.5V enables switching; ≤0.4V disables regulator and reduces input current to 1µA. |
| 5 (VIN) | Supply input | Primary power input (2.5V–10V); requires ≥1µF ceramic capacitor placed adjacent to pin for high-frequency decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with ceramic capacitors | Eliminates need for bulky electrolytic or tantalum output caps - enables ultra-thin camera module designs using only X5R/X7R MLCCs. |
| Constant-frequency PWM control | Reduces EMI spread and simplifies filtering vs. variable-frequency topologies; critical for meeting FCC Class B radiated emissions in smartphones. |
| Low 95mV feedback threshold | Reduces power loss in current-sense resistor by ~75% vs. typical 200mV references, lowering thermal stress in sealed enclosures. |
| UVLO and overtemperature protection | Prevents malfunction during cold-start battery conditions or sustained flash operation - shuts down before junction exceeds 150°C. |
| 1µA shutdown current | Extends system-level standby time in always-on camera subsystems, e.g., facial recognition modules in foldable phones. |
Applications
| Smartphone Photo Flash | Digital Camera Auxiliary Flash |
|---|---|
Use Scenario: High-intensity burst illumination for low-light smartphone photography with rapid recharge between shots. IC Role / Device Role / Timing Role: Boost regulator providing regulated 100mA current to 3× white LEDs in series, synchronized to camera shutter timing. Use Value: Enables full-brightness flash from 3.6V nominal Li-ion supply with <1.5ms turn-on delay and no external ballast resistors. | Use Scenario: Compact auxiliary flash module in portable digital cameras requiring consistent color temperature and minimal PCB footprint. IC Role / Device Role / Timing Role: Constant-current LED driver supporting programmable flash duration (10–200ms) via EN pin PWM control. Use Value: Delivers stable 100mA LED current across 3V–4.2V battery range, maintaining ±3% brightness accuracy without recalibration. |
| IP Phone Visual Alert | Industrial Barcode Scanner Flash |
Use Scenario: Visual ring indicator and message alert in VoIP desk phones operating from PoE or local 5V supply. IC Role / Device Role / Timing Role: Low-duty-cycle flash driver triggered by SIP signaling, powered from 5V rail with minimal heat generation. Use Value: Achieves 10,000+ flash cycles/hour with <100mW average power draw due to 1µA shutdown state and ceramic-capacitor efficiency. | Use Scenario: High-speed illumination for CMOS image sensor capture in rugged handheld barcode scanners used in warehouses. IC Role / Device Role / Timing Role: Robust LED driver delivering microsecond-precision flash pulses synchronized to image exposure timing. Use Value: Maintains 100mA output current at –20°C ambient (per spec) ensuring reliable decode performance in refrigerated logistics environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED flash driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1561ETA+ | 1.2A switch, 1.2MHz, but uses 200mV FB reference and requires larger sense resistor; no integrated OVP. | Same Thin SOT23-8 package; higher FB voltage increases sense resistor power loss and thermal load. | Select MAX1561ETA+ only if legacy design reuse mandates identical pinout and existing 200mV-based feedback network. |
| TPS61310DSKR | 1.5A switch, 1.5MHz, 100mV FB, but rated only to 85°C junction; no UVLO hysteresis or thermal shutdown. | Supports up to 28V output; lacks overtemperature protection needed for sustained flash in enclosed housings. | Choose TPS61310DSKR for cost-sensitive consumer electronics where ambient temperature stays below 60°C and flash duty cycle is <5%. |
Compared with MAX1561ETA+ and TPS61310DSKR, the MIC2291YD5-TR provides superior thermal robustness (125°C rating), lower feedback loss (95mV), and guaranteed 1.2A switch current in a Pb-free Thin SOT23-5 - making it optimal for high-reliability, space-constrained flash applications demanding long-term stability.
Availability
MIC2291YD5-TR is available at Aetrix Electronics and suitable for smartphone photo flash, digital camera auxiliary lighting, and IP phone visual alerts requiring stable component supply across extended production lifecycles.
Supply support for MIC2291YD5-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 semiconductor company specializing in analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015.
The MIC2291 product line was engineered specifically for high-efficiency, compact white LED flash drivers in battery-powered imaging systems - prioritizing low profile, minimal external components, and robust thermal performance.
FAQ
What is the maximum output voltage supported by the MIC2291YD5-TR?
The MIC2291YD5-TR supports output voltages up to 34V, determined by external component ratings and circuit topology. Unlike MLF-package variants, it does not integrate OVP circuitry - so designers must select output capacitors and Schottky diodes rated for ≥34V to ensure safe operation under worst-case boost conditions.
Does the MIC2291YD5-TR include overvoltage protection?
No, the MIC2291YD5-TR does not include overvoltage protection. Per the datasheet's Ordering Information table, only MLF-package variants (e.g., MIC2291-15YML, MIC2291-34YML) feature OVP pins. The MIC2291YD5-TR uses the 5-pin Thin SOT23 package with pins VIN, EN, SW, FB, and GND - omitting both OVP and AGND/PGND separation found in the 8-pin version.
What is the recommended inductor value for the MIC2291YD5-TR in a typical photo flash application?
The datasheet specifies 10µH as the recommended inductor value for the MIC2291YD5-TR in standard photo flash designs. This value balances efficiency, stability, size, and cost - delivering optimal peak-to-peak ripple current while maintaining compatibility with the 1.2MHz switching frequency and ceramic output capacitors.
Can the MIC2291YD5-TR drive more than three white LEDs in series?
Yes, the MIC2291YD5-TR can drive more than three white LEDs in series if the total forward voltage remains within its 34V output capability and the current-sense resistor is adjusted accordingly. For example, four 3.2V LEDs (12.8V total VF) plus headroom still falls well below 34V, enabling flexible LED string configuration without changing the MIC2291YD5-TR itself.
How does the MIC2291YD5-TR achieve dimming control?
The MIC2291YD5-TR supports two dimming methods: PWM dimming via the EN pin (applying external 100Hz–10kHz signal to enable/disable the regulator) and continuous dimming via DC voltage injection into the FB pin through a series resistor. Both methods preserve the 95mV reference-based current regulation while varying average LED intensity.
MIC2291YD5-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:
- 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:
- -
- 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
MIC2291YD5-TR FAQ
1.How can I place an order for MIC2291YD5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2291YD5-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 MIC2291YD5-TR reliable?
The price and inventory of MIC2291YD5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2291YD5-TR is usually 5 days.
3.What payment methods are accepted for MIC2291YD5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2291YD5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2291YD5-TR?
MIC2291YD5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2291YD5-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 MIC2291YD5-TR?
For technical support, including MIC2291YD5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2291YD5-TR requirements.
6.How does Aetrix verify that MIC2291YD5-TR is sourced from the original manufacturer or authorized distributors?
All MIC2291YD5-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 MIC2291YD5-TR meets industry standards.
7.What is the process for return or replacement of MIC2291YD5-TR?
All MIC2291YD5-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2291YD5-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 MIC2291YD5-TR part is unused and in its original packaging.
Return procedure for MIC2291YD5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC2291YD5-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
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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
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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