My Inquiry
My Account
Microchip Technology MIC2291-34BML-TR
- Part No.:
- MIC2291-34BML-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 8-VFDFN Exposed Pad, 8-MLF®
- Datasheet:
-
MIC2291-34BML-TR.pdf
- Description:
- IC LED DRVR RGLTR PWM 1.2A 8MLF
- Quantity:
- Payment:
- Shipping:
Inventory:3,180
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MIC2291-34BML-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 flash circuits.
For engineers reviewing the MIC2291-34BML-TR datasheet, MIC2291-34BML-TR pinout, MIC2291-34BML-TR application, or MIC2291-34BML-TR equivalent, key selection criteria include OVP threshold (34V), MLF-8 package thermal resistance (93°C/W), shutdown current (≤1µA), and compatibility with ceramic output capacitors in space-constrained handheld imaging systems.
Technical Context
The MIC2291-34BML-TR implements constant-frequency current-mode PWM control using an internal 1.2MHz oscillator, slope-compensated ramp generator, and gm error amplifier. Its bipolar output switch delivers up to 1.2A peak current with 550mV saturation voltage at 1.0A, enabling high-efficiency boost conversion in discontinuous conduction mode.
It integrates dedicated OVP functionality via Pin 1 (OVP) - unique to the MLF-8 variant - which clamps output voltage when feedback is lost. The 95mV reference minimizes power loss in the external current-sense resistor, while UVLO (2.1V typ) and thermal shutdown (150°C) ensure robust operation 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 (3–4.2V) and dual-cell alkaline inputs without external regulation. |
| Switch Current Limit | 1.2A - enables driving ≥3 white LEDs in series at 100mA with margin for transient loads. |
| OVP Threshold | 34V - matches high-output-voltage flash configurations; prevents damage during FB open-circuit faults. |
| Feedback Voltage | 95mV ±5% - reduces I²R loss in current-sense resistor by >50% vs. standard 1.25V references. |
| Shutdown Current | ≤1µA - extends battery life in standby mode for portable imaging devices. |
| Oscillator Frequency | 1.2MHz (±12.5%) - allows use of small 10µH inductors and 1µF ceramic output capacitors. |
| Junction Temp Range | –40°C to +125°C - qualified for automotive cabin and industrial handheld environments. |
Pinout & Package
The MIC2291-34BML-TR is housed in an 8-pin 2mm × 2mm MLF® package with exposed pad (EP) for thermal dissipation. Pin 1 is OVP; Pin 5 is NC; Pins 4 and 8 are separated AGND and PGND for noise isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OVP) | Overvoltage protection input | Connects to output node; triggers shutdown if VOVP exceeds 34V, preventing uncontrolled rise during FB fault. |
| 2 (VIN) | Power supply input | Accepts 2.5–10V DC; internal UVLO disables regulator below 2.1V to prevent brownout instability. |
| 3 (EN) | Enable control input | Logic-high (≥1.5V) activates switching; logic-low (≤0.4V) reduces quiescent current to ≤1µA. |
| 4 (AGND) | Analog ground reference | Provides low-noise return for FB and OVP; internally tied to PGND but kept separate on PCB for EMI reduction. |
| 5 (NC) | No-connect terminal | Not bonded; must remain unconnected to avoid parasitic coupling or latch-up risk. |
| 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 inductor; rated for –0.3V to 34V; requires Schottky catch diode for boost topology. |
| 8 (PGND) | Power ground return | Carries high-pulsed switch current; must be routed separately from AGND and connected to EP for thermal performance. |
| EP | Exposed thermal pad | Internally connected to GND; soldered to PCB copper pour to achieve θJA = 93°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency PWM control | 1.2MHz operation enables <10µH inductors and eliminates audible noise in consumer imaging devices. |
| Dual-ground architecture | Separated AGND and PGND pins reduce switching noise coupling into feedback path, improving current regulation accuracy. |
| Low-feedback reference | 95mV reference cuts sense-resistor power loss by 92% vs. 1.25V references, extending battery runtime in flash mode. |
| Integrated OVP with dedicated pin | OVP pin (Pin 1) provides hardware-level protection independent of FB loop, critical for fail-safe flash driver reliability. |
| Ceramic capacitor compatibility | Stable with X5R/X7R 1µF+ output caps - eliminates need for bulkier tantalum or electrolytic capacitors in thin-profile cameras. |
Applications
| Smartphone Camera Flash | Digital Still Camera Flash |
|---|---|
Use Scenario: High-intensity burst flash in sub-10mm-thick smartphone modules with single Li-ion battery. IC Role / Device Role / Timing Role: Boost regulator and LED current controller; delivers regulated 100mA to 3× white LEDs in <50ms pulse width. Use Value: 34V OVP prevents overvoltage failure during LED string open-circuit events, ensuring field reliability in mass-produced handsets. | Use Scenario: Dual-mode flash (still capture + video assist) in compact digital cameras powered by AA/AAA batteries. IC Role / Device Role / Timing Role: Constant-current LED driver with PWM dimming interface via EN pin for adjustable flash intensity. Use Value: 1.2MHz switching frequency allows miniaturized 10µH inductors, reducing PCB area by >40% vs. 500kHz alternatives. |
| IP Phone Visual Alert | Portable LED Flashlight |
Use Scenario: Bright visual ring indicator in VoIP desk phones using 3.3V system rail and minimal board space. IC Role / Device Role / Timing Role: Step-up current source converting 3.3V to ~12V for 3-LED string; enabled only during call alerts. Use Value: ≤1µA shutdown current ensures negligible battery drain during weeks of standby between calls. | Use Scenario: Rechargeable flashlight with Li-ion input and programmable brightness levels via microcontroller. IC Role / Device Role / Timing Role: Primary LED driver IC; accepts analog dimming voltage on FB pin for smooth intensity control. Use Value: 95mV feedback reference enables use of 0805-size 0.95Ω sense resistor, minimizing BOM cost and footprint. |
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 current, 2.5–6.5V input, no integrated OVP; requires external OVP circuit for 34V protection. | Lacks dedicated OVP pin; suitable for lower-voltage flash designs (<20V) where fault protection is handled at system level. | Select when board space permits external protection and higher switch current is needed for multi-string configurations. |
| MAX1910EUT+T | 1.0A switch current, 2.6–5.5V input, fixed 15V OVP; no MLF-8 package option - offered only in SOT23-6. | Lower OVP threshold limits max LED string voltage; smaller package lacks thermal pad, limiting continuous flash duration. | Prefer for cost-sensitive, low-power flash in PDAs where 15V OVP suffices and thermal constraints are less stringent. |
Compared with TPS61310DSKR and MAX1910EUT+T, the MIC2291-34BML-TR uniquely combines 34V hardware OVP, MLF-8 thermal performance (93°C/W), and 95mV reference in a single die - making it optimal for compact, high-reliability photo flash where output fault containment and battery efficiency are co-prioritized.
Availability
MIC2291-34BML-TR is available at Aetrix Electronics and suitable for smartphone camera flash, digital still camera flash, and IP phone visual alert applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC2291-34BML-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, space-constrained white LED photo flash drivers in portable consumer electronics, emphasizing thermal robustness, fault protection, and battery longevity.
FAQ
What is the maximum output voltage supported by the MIC2291-34BML-TR?
The MIC2291-34BML-TR features a factory-trimmed overvoltage protection threshold of 34V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This value is fixed for this variant and applies to the OVP pin (Pin 1); exceeding 34V at the output triggers immediate shutdown to protect the internal switch and external components. The device can regulate outputs up to just below this limit, e.g., 32V typical under load.
Does the MIC2291-34BML-TR require an external Schottky diode?
Yes, the MIC2291-34BML-TR requires an external Schottky diode for boost converter operation. The internal bipolar switch connects to the SW pin, and energy transfer to the output occurs through the diode during switch-off periods. Micrel's datasheet specifies a 1A/40V Schottky diode (e.g., SS14) as typical; reverse voltage rating must exceed the 34V OVP threshold, and forward current rating must handle peak inductor current.
How is LED current set on the MIC2291-34BML-TR?
LED current is set by an external resistor connected between the FB pin and ground. The MIC2291-34BML-TR regulates the voltage at FB to 95mV (±5%), so the LED current equals 95mV divided by the sense resistor value (ILED = 0.095 / RSENSE). For example, a 0.95Ω resistor sets 100mA. This low-reference design minimizes power loss and heat generation in the sense resistor.
Can the MIC2291-34BML-TR operate from a 3.3V supply?
Yes, the MIC2291-34BML-TR operates from 2.5V to 10V input, fully supporting 3.3V rails. At 3.3V input and 12V output (3-LED string), the calculated duty cycle is ~73%, well within the 85% maximum limit. Performance remains stable with ceramic input/output capacitors, and quiescent current stays below 5mA per Electrical Characteristics data.
What is the thermal performance of the MIC2291-34BML-TR in its MLF-8 package?
The MIC2291-34BML-TR in the 2mm × 2mm MLF-8 package has a junction-to-ambient thermal resistance (θJA) of 93°C/W when mounted on a standard 4-layer PCB with 1in² copper pour under the exposed pad. This enables continuous 100mA LED drive at +85°C ambient without thermal shutdown, provided the EP pad is fully soldered and thermally connected to the ground plane.
MIC2291-34BML-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:
- 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)
MIC2291-34BML-TR FAQ
1.How can I place an order for MIC2291-34BML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2291-34BML-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 MIC2291-34BML-TR reliable?
The price and inventory of MIC2291-34BML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2291-34BML-TR is usually 5 days.
3.What payment methods are accepted for MIC2291-34BML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2291-34BML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2291-34BML-TR?
MIC2291-34BML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2291-34BML-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 MIC2291-34BML-TR?
For technical support, including MIC2291-34BML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2291-34BML-TR requirements.
6.How does Aetrix verify that MIC2291-34BML-TR is sourced from the original manufacturer or authorized distributors?
All MIC2291-34BML-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 MIC2291-34BML-TR meets industry standards.
7.What is the process for return or replacement of MIC2291-34BML-TR?
All MIC2291-34BML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2291-34BML-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 MIC2291-34BML-TR part is unused and in its original packaging.
Return procedure for MIC2291-34BML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC2291-34BML-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
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
