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Microchip Technology MIC2846A-MFYMT-TR
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- Part No.:
- MIC2846A-MFYMT-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 14-UFQFN Exposed Pad, 14-TMLF®
- Datasheet:
-
MIC2846A-MFYMT-TR.pdf
- Description:
- IC LED DRIVER LINEAR 20MA 14TMLF
- Quantity:
- Payment:
- Shipping:
Inventory:3,268
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Product details
Overview
MIC2846A-MFYMT-TR from Micrel is a 6-channel linear white LED driver with dual low-IQ LDOs (2.8V and 1.5V), Dynamic Average Matching™ (±1.5% typical channel matching), 40mV dropout at 20mA, and single-wire digital dimming across 49 logarithmic brightness steps - designed for LCD and keypad backlighting in mobile handsets and portable media devices.
For engineers reviewing the MIC2846A-MFYMT-TR datasheet, MIC2846A-MFYMT-TR pinout, MIC2846A-MFYMT-TR application, or MIC2846A-MFYMT-TR equivalent, key selection criteria include linear WLED efficiency without boost noise, dual-LDO voltage accuracy (±3%), thermal shutdown protection, and compatibility with 1µF ceramic output capacitors for compact portable designs.
Technical Context
The MIC2846A-MFYMT-TR integrates six independent current-sink drivers with DAM™ architecture that multiplexes four voltage references to maintain ±1.5% matching across all channels and temperature. Its linear topology eliminates switching losses and EMI by driving LEDs directly from battery voltage (3.0–5.5V) with only 40mV dropout at 20mA.
Two independently enabled LDOs deliver stable 2.8V and 1.5V outputs with 150mV dropout at 150mA, 35µA ground current, and ±3% output accuracy over –40°C to +125°C. Each LDO uses internal feedback resistors and a PFET pass element, requiring only 1µF ceramic output capacitance for stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 6 independent current-sink drivers, each configurable up to 20mA via RSET resistor |
| Current Matching | ±1.5% typical across all 6 channels - ensures uniform backlight luminance without per-channel calibration |
| Digital Dimming | 49 logarithmic brightness steps via single-wire DC pin - matches human eye perception and reduces MCU PWM overhead |
| LDO Outputs | 2.8V (LDO1) and 1.5V (LDO2), both with ±3% accuracy and 150mV dropout at 150mA - supports dual-rail analog/RF subsystems |
| Quiescent Current | 35µA typical per LDO in active mode; <1µA in shutdown - extends battery life in always-on standby states |
| Operating Temp | –40°C to +125°C junction range - qualified for automotive infotainment and industrial handheld environments |
| Package | 14-pin 2.5mm × 2.5mm Thin MLF® (TMLF) with exposed thermal pad - enables high-power-density PCB layout |
Pinout & Package
The MIC2846A-MFYMT-TR is housed in a 2.5mm × 2.5mm 14-pin Thin MLF® (TMLF) package with an exposed heat sink pad (EPAD) that must be connected to GND for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power input | Supplies all internal blocks; requires ≥1µF ceramic bypass capacitor to GND for noise suppression and stability |
| LDO2 (Pin 2) | LDO2 output | Delivers regulated 1.5V; connect ≥1µF ceramic capacitor to GND for transient response and ripple rejection |
| EN2 (Pin 3) | LDO2 enable | Active-high logic control; floating state prohibited - use pull-down if unused to prevent erratic LDO activation |
| DC (Pin 4) | Digital dimming & enable | Single-wire interface for brightness programming and sleep mode entry (≥1260µs low = shutdown) |
| RSET (Pin 5) | LED current reference | Sets master current via external resistor; e.g., 20.5kΩ yields 20mA at 100% duty cycle |
| D1–D6 (Pins 6–8, 10–12) | LED cathode drivers | Current-sink outputs; connect LED anodes to VIN and cathodes to respective D pins - no external FETs required |
| GND (Pin 9) | Common ground return | Low-impedance path for LED sinks and LDOs; tie EPAD directly to this node for optimal thermal dissipation |
| EN1 (Pin 13) | LDO1 enable | Independent active-high control for 2.8V rail; allows dynamic power gating of subsystems |
| LDO1 (Pin 14) | LDO1 output | Delivers regulated 2.8V; same capacitor requirements as LDO2 for consistent noise performance |
Key Features
| Feature | Design Value |
|---|---|
| No-boost linear WLED drive | Eliminates EMI and efficiency loss from inductive boost or charge-pump topologies - critical for RF-sensitive handset designs |
| DAM™ architecture | Uses time-multiplexed reference averaging to achieve ±1.5% matching across process, voltage, and temperature - removes need for factory binning |
| Single-wire digital dimming | Reduces MCU GPIO count and firmware complexity versus PWM; supports preset startup brightness and one-step level changes |
| Dual low-IQ LDOs | Each draws only 35µA quiescent current and shuts down to <1µA - preserves battery during display-off periods |
| Thermal & current protection | Integrated thermal shutdown and current limiting on both LDOs - prevents damage during short-circuit or overload conditions |
Applications
| Mobile Handset Backlighting | Keypad Illumination System |
|---|---|
Use Scenario: Driving 6-series WLED strings for main LCD panel backlight in GSM/UMTS smartphones with 3.7V Li-ion battery supply. IC Role / Device Role / Timing Role: Linear WLED driver with DAM™ matching and dual-LDO power rails for display controller and touch IC. Use Value: Delivers uniform brightness at 49 dimming levels while eliminating boost converter noise that interferes with cellular RX sensitivity. | Use Scenario: Low-current illumination of alphanumeric keypad in ruggedized field phones operating across –20°C to +60°C ambient. IC Role / Device Role / Timing Role: Six-channel current sink with programmable per-key dimming via single-wire interface and integrated 1.5V LDO for keypad controller logic. Use Value: Achieves ±1.5% LED matching without trimming resistors, reducing BOM cost and assembly time versus discrete solutions. |
| Digital Camera Flash Support | Portable Media Player UI Lighting |
Use Scenario: Parallel connection of all 6 D-pins to drive high-brightness flash LED in 5MP camera modules with burst-mode operation. IC Role / Device Role / Timing Role: High-current WLED driver (6× channel current) with fast start-up (<140µs) and phase-shifted dimming to minimize EMI during photo capture. Use Value: Enables 120mA flash current using existing 2.5mm × 2.5mm footprint - avoids redesign for dedicated flash ICs. | Use Scenario: Backlighting OLED status indicators and navigation buttons in MP3 players powered by 3.6V Li-Po batteries. IC Role / Device Role / Timing Role: Dual-LDO provider (2.8V for audio codec, 1.5V for microcontroller I/O) with synchronized LED dimming via shared DC pin. Use Value: Reduces component count by integrating three power domains (LED bias, analog rail, digital rail) into one TMLF package. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear WLED driver with dual-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3631DSXR | 5-channel WLED driver + single 3.3V LDO; no DAM™ matching; 60mV dropout at 20mA | Lacks second LDO and tighter current matching - suitable only when 1.5V rail is generated elsewhere | Select LM3631DSXR only if system already provides 1.5V and tolerates ±3% LED mismatch |
| TPS61165DRVR | Inductive boost WLED driver (not linear); 6-channel; no integrated LDOs; higher EMI | Requires external inductor and compensation components - increases board area and noise filtering complexity | Choose TPS61165DRVR only when input voltage falls below 3.0V and battery headroom is insufficient for linear operation |
Compared with LM3631DSXR and TPS61165DRVR, the MIC2846A-MFYMT-TR uniquely combines 6-channel DAM™ matching, dual-LDO integration, and zero-EMI linear drive - making it the only option for noise-sensitive, space-constrained, dual-rail portable designs requiring ±1.5% LED uniformity.
Availability
MIC2846A-MFYMT-TR is available at Aetrix Electronics and suitable for mobile handset backlighting, keypad illumination systems, and portable media player UI lighting requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.
Supply support for MIC2846A-MFYMT-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 fabless semiconductor company specializing in power management, analog, and timing solutions before its acquisition by Microchip Technology in 2015.
The MIC2846A-MFYMT-TR belongs to Micrel's linear LED driver product line, engineered specifically for battery-powered portable displays where EMI-free operation, ultra-low quiescent current, and precise multi-channel current matching are mandatory design requirements.
FAQ
What is the maximum LED current per channel supported by the MIC2846A-MFYMT-TR?
The MIC2846A-MFYMT-TR supports up to 20mA per channel when configured with a 20.5kΩ RSET resistor at 100% duty cycle. Peak current scales linearly with RSET value using the formula ILED(mA) = 410 × ADC / RSET(kΩ), where ADC is the average duty cycle. The device maintains regulation down to 40mV dropout at 20mA, enabling direct battery drive without boost circuitry.
How does the DAM™ technology in the MIC2846A-MFYMT-TR improve LED matching compared to standard current mirrors?
The DAM™ (Dynamic Average Matching™) architecture in the MIC2846A-MFYMT-TR uses time-multiplexed sampling of four internal voltage references to continuously correct for process, voltage, and temperature variations across all six channels. This achieves ±1.5% typical matching - significantly tighter than conventional current mirrors (±5–10%) - ensuring uniform backlight luminance without factory binning or per-channel calibration.
Can the MIC2846A-MFYMT-TR drive more than six LEDs, and if so, how?
Yes - the MIC2846A-MFYMT-TR can drive higher-current LEDs by paralleling its D1–D6 outputs. Connecting all six cathode driver pins to a single high-brightness WLED (e.g., flash LED) delivers up to 6× the per-channel current (e.g., 120mA with 20mA/channel setting). Phase-shifted dimming across channels reduces peak EMI, making this configuration suitable for camera flash applications without requiring external MOSFETs.
What are the recommended capacitor types and values for the LDO outputs of the MIC2846A-MFYMT-TR?
The MIC2846A-MFYMT-TR requires ≥1µF ceramic output capacitors on both LDO1 and LDO2 pins for stability. X7R or X5R dielectric types are recommended due to their stable capacitance over temperature (±15% for X7R); Y5V dielectrics are not recommended as they lose >50% capacitance across the operating range. Increasing to 2.2µF improves ripple rejection without impacting footprint.
Does the MIC2846A-MFYMT-TR support presetting brightness at power-up, and how is it implemented?
Yes - the MIC2846A-MFYMT-TR supports brightness presetting during start-up. Within 5–75µs after pulling the DC pin high, a falling edge sets the initial brightness level (0–48); each subsequent edge decrements the level. This allows the device to power on at any desired luminance without MCU intervention, reducing boot-time latency and simplifying firmware for portable UIs.
MIC2846A-MFYMT-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 14-UFQFN Exposed Pad, 14-TMLF®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 20mA
- Frequency:
- -
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TMLF® (2.5x2.5)
MIC2846A-MFYMT-TR FAQ
1.How can I place an order for MIC2846A-MFYMT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2846A-MFYMT-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 MIC2846A-MFYMT-TR reliable?
The price and inventory of MIC2846A-MFYMT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2846A-MFYMT-TR is usually 5 days.
3.What payment methods are accepted for MIC2846A-MFYMT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2846A-MFYMT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2846A-MFYMT-TR?
MIC2846A-MFYMT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2846A-MFYMT-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 MIC2846A-MFYMT-TR?
For technical support, including MIC2846A-MFYMT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2846A-MFYMT-TR requirements.
6.How does Aetrix verify that MIC2846A-MFYMT-TR is sourced from the original manufacturer or authorized distributors?
All MIC2846A-MFYMT-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 MIC2846A-MFYMT-TR meets industry standards.
7.What is the process for return or replacement of MIC2846A-MFYMT-TR?
All MIC2846A-MFYMT-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2846A-MFYMT-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 MIC2846A-MFYMT-TR part is unused and in its original packaging.
Return procedure for MIC2846A-MFYMT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC2846A-MFYMT-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
-
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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