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Microchip Technology MIC2291-34YML-TR
- Part No.:
- MIC2291-34YML-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 8-VFDFN Exposed Pad, 8-MLF®
- Datasheet:
-
MIC2291-34YML-TR.pdf
- Description:
- IC LED DRVR RGLTR PWM 1.2A 8MLF
- Quantity:
- Payment:
- Shipping:
Inventory:2,257
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Product details
Overview
MIC2291-34YML-TR from Micrel is a 1.2MHz PWM boost regulator optimized for white LED photo flash applications, featuring 1.2A switch current, 34V overvoltage protection, and 95mV feedback voltage. It drives three-series white LEDs at 100mA from a single Li-ion cell (3–4.2V), eliminating ballast resistors in compact mobile camera modules.
For engineers reviewing the MIC2291-34YML-TR datasheet, MIC2291-34YML-TR pinout, MIC2291-34YML-TR application, or MIC2291-34YML-TR equivalent, key selection criteria include OVP threshold accuracy, MLF-8 thermal resistance (93°C/W), shutdown current (<1µA), and compatibility with ceramic output capacitors in space-constrained flash circuits.
Technical Context
The MIC2291-34YML-TR implements constant-frequency current-mode PWM control using an internal 1.2MHz oscillator, slope-compensated ramp generator, and gm error amplifier. Its bipolar switch delivers 1.2A peak current with 550mV saturation voltage at 1A, enabling high-efficiency boost conversion up to 34V output.
It integrates overvoltage protection tied to the OVP pin (pin 1), which disables switching when output exceeds ~32–34V-critical for safeguarding LEDs and external diodes during FB pin fault conditions. The 95mV feedback reference minimizes power loss in the current-sense resistor and reduces total output headroom.
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 inputs without external regulation. |
| Switch Current Limit | 1.2A - guarantees reliable drive of 3× white LEDs at 100mA with margin for transient loads. |
| OVP Threshold | 30–34V - precise clamping for MLF-8 variant prevents destructive overvoltage during open-FB faults. |
| Feedback Voltage | 95mV ±5% - enables low-loss current sensing with minimal voltage overhead on LED string. |
| Shutdown Current | 0.1–1µA - preserves battery life in standby mode for portable imaging systems. |
| Oscillator Frequency | 1.05–1.35MHz - allows use of small 10µH inductors and 1µF ceramic output capacitors. |
| Junction Temp Range | –40°C to +125°C - ensures operation in sealed camera modules under thermal stress. |
Pinout & Package
Package: 8-pin 2mm × 2mm MLF® (exposed pad), Pb-free, RoHS-compliant, θJA = 93°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OVP) | Overvoltage protection input | Connects to output node; triggers shutdown if voltage exceeds 34V threshold - critical for fault-safe flash operation. |
| 2 (VIN) | Power supply input | Accepts 2.5–10V DC; must be decoupled with ≥1µF ceramic capacitor near pin. |
| 3 (EN) | Enable logic input | Active-high (≥1.5V); controls flash timing via microcontroller GPIO with <1µA leakage in shutdown. |
| 4 (AGND) | Analog ground reference | Internally connected to GND; separates noise-sensitive feedback path from power return. |
| 5 (NC) | No connect | Unbonded die pad; must remain unconnected on PCB to avoid parasitic coupling. |
| 6 (FB) | Current-sense feedback input | Monitors voltage across external sense resistor; regulates LED current to ILED = 95mV / RSENSE. |
| 7 (SW) | Switch node output | Drives external Schottky diode and inductor; handles 1.2A peak bipolar current with 550mV VCE(sat). |
| 8 (PGND) | Power ground return | Low-impedance path for switch current; requires direct connection to exposed pad for thermal performance. |
| EP (Exposed Pad) | Thermal & electrical ground | Soldered to PCB copper pour; essential for achieving 93°C/W thermal resistance and reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with ceramic capacitors | Eliminates need for electrolytic or tantalum output caps - improves reliability and saves board area in thin mobile designs. |
| 1.2MHz fixed-frequency PWM | Enables use of 10µH inductors and 1µF X5R/X7R ceramics - reduces BOM cost and footprint vs. lower-frequency boosters. |
| 95mV feedback reference | Reduces power dissipation in current-sense resistor by >50% vs. standard 200mV references - extends battery runtime per flash pulse. |
| Integrated OVP (34V) | Prevents catastrophic failure during FB pin short or open-circuit faults - protects LEDs, diode, and IC without external crowbar circuitry. |
| –40°C to +125°C operation | Validated for automotive-grade ambient environments and thermally dense camera modules without derating. |
Applications
| Smartphone Camera Flash | Digital Still Camera Module |
|---|---|
Use Scenario: High-intensity LED flash synchronized with image capture in sub-10mm-thick smartphone bezels. IC Role / Device Role / Timing Role: Boost regulator and LED current controller; triggered by baseband processor EN signal with <10µs startup delay. Use Value: Delivers 100mA to 3× white LEDs from 3.6V Li-ion with <1% load regulation - ensures consistent flash brightness across battery discharge cycle. | Use Scenario: Compact standalone camera module requiring programmable flash intensity and thermal safety. IC Role / Device Role / Timing Role: Primary LED driver with OVP fault response; interfaces with MCU via EN and FB for analog dimming. Use Value: 34V OVP and –40°C to +125°C rating enable robust operation in outdoor cameras exposed to temperature extremes. |
| IP Phone Visual Alert | Portable Medical Imaging Light |
Use Scenario: Status illumination and emergency alert flash in VoIP handsets with limited PCB real estate. IC Role / Device Role / Timing Role: Low-quiescent-current flash driver; activated by SIP signaling events via GPIO-controlled EN pin. Use Value: 1µA shutdown current preserves PoE-powered standby time; 2mm × 2mm MLF package fits within 12mm² footprint constraints. | Use Scenario: Battery-powered dermatoscope or otoscope requiring calibrated, repeatable flash intensity. IC Role / Device Role / Timing Role: Precision current source for diagnostic LED array; uses FB pin for DAC-based continuous dimming control. Use Value: 95mV reference and <1% line/load regulation ensure ±2% LED current accuracy - critical for clinical light consistency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED flash driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61310DSQR | 1.5A switch current, 32V OVP, 2.5–6.5V input, integrated MOSFET | Requires external current-sense resistor; no dedicated OVP pin - relies on internal comparator with less precise trip point | Preferred for higher-current flash arrays (>120mA) where MOSFET RDS(on) efficiency outweighs OVP granularity |
| MAX1910ETA+ | 1.0A switch current, 28V OVP, 2.6–5.5V input, 1.2MHz, same MLF-8 package | Fixed 28V OVP; lacks separate OVP pin - uses FB pin for both regulation and overvoltage detection | Drop-in replacement only for 28V OVP designs; not suitable where 34V clamping is required for 3× LED strings |
Compared with TPS61310DSQR and MAX1910ETA+, the MIC2291-34YML-TR provides superior OVP precision via dedicated pin, lower feedback voltage for reduced sense-resistor loss, and validated operation up to +125°C junction - making it optimal for thermally constrained, safety-critical flash systems.
Availability
MIC2291-34YML-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, Pb-free compliance, and guaranteed long-term availability.
Supply support for MIC2291-34YML-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 designed specifically for high-brightness, battery-powered LED photo flash applications - prioritizing compact size, low quiescent current, and robust fault protection in mobile imaging systems.
FAQ
What is the maximum output voltage supported by the MIC2291-34YML-TR?
The MIC2291-34YML-TR features 34V overvoltage protection, meaning it will shut down switching if the output exceeds approximately 32–34V. This threshold is factory-trimmed and applies specifically to the MLF-8 package variant. The device can regulate outputs up to this limit, but sustained operation above 30V requires careful thermal design due to increased switch stress.
Does the MIC2291-34YML-TR require an external Schottky diode?
Yes, the MIC2291-34YML-TR requires an external Schottky diode (e.g., 1A/40V rated) connected between the SW pin and output capacitor. The internal bipolar transistor does not integrate a body diode, so the external diode completes the boost converter's current path during switch-off periods and prevents reverse current flow.
How is LED current set on the MIC2291-34YML-TR?
LED current is set by connecting a resistor between the FB pin and ground. Using the 95mV internal reference, current is calculated as ILED = 95mV / RFB. For example, a 950Ω resistor sets 100mA. The FB pin must be connected directly to the LED cathode to maintain accurate current regulation and enable OVP functionality.
Can the MIC2291-34YML-TR operate from a 1.5V alkaline cell?
No, the MIC2291-34YML-TR has a minimum input voltage of 2.5V and an under-voltage lockout (UVLO) threshold of 1.8–2.4V. A single 1.5V alkaline cell falls below this range and cannot power the device. It is designed for single Li-ion (3–4.2V) or two-series alkaline (3–3.2V fresh) inputs.
What is the role of the exposed pad (EP) on the MIC2291-34YML-TR MLF package?
The exposed pad (EP) on the MIC2291-34YML-TR serves as both a thermal dissipation path and an electrical ground connection. It must be soldered to a PCB copper pour tied to PGND to achieve the specified 93°C/W junction-to-ambient thermal resistance. Leaving it unconnected degrades thermal performance and risks thermal shutdown under full-load conditions.
MIC2291-34YML-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:
- 34V
- 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)
MIC2291-34YML-TR FAQ
1.How can I place an order for MIC2291-34YML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2291-34YML-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 MIC2291-34YML-TR reliable?
The price and inventory of MIC2291-34YML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2291-34YML-TR is usually 5 days.
3.What payment methods are accepted for MIC2291-34YML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2291-34YML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2291-34YML-TR?
MIC2291-34YML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2291-34YML-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 MIC2291-34YML-TR?
For technical support, including MIC2291-34YML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2291-34YML-TR requirements.
6.How does Aetrix verify that MIC2291-34YML-TR is sourced from the original manufacturer or authorized distributors?
All MIC2291-34YML-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 MIC2291-34YML-TR meets industry standards.
7.What is the process for return or replacement of MIC2291-34YML-TR?
All MIC2291-34YML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2291-34YML-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 MIC2291-34YML-TR part is unused and in its original packaging.
Return procedure for MIC2291-34YML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC2291-34YML-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
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