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Microchip Technology MIC2842AYMT-TR
- Part No.:
- MIC2842AYMT-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 10-UFDFN Exposed Pad, 10-TMLF®
- Datasheet:
-
MIC2842AYMT-TR.pdf
- Description:
- IC LED DRIVER LINEAR DIM 10TMLF
- Quantity:
- Payment:
- Shipping:
Inventory:4,412
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Product details
Overview
MIC2842AYMT-TR from Micrel is a high-efficiency 4-channel linear white LED (WLED) driver IC designed for portable display and keypad backlighting. It operates from 3.0V to 5.5V input, delivers ±1.5% typical current matching across channels, achieves 40mV dropout at 20mA, and supports 49-step logarithmic brightness control via single-wire digital interface - enabling uniform illumination in mobile handsets and GPS devices.
For engineers reviewing the MIC2842AYMT-TR datasheet, MIC2842AYMT-TR pinout, MIC2842AYMT-TR application, or MIC2842AYMT-TR equivalent, this page provides verified technical context, package mapping, real-world dimming timing constraints, thermal performance (θJA = 90°C/W), and validated alternative options for WLED driver selection in battery-powered consumer electronics.
Technical Context
The MIC2842AYMT-TR implements a linear architecture with four independent current-mirror drivers, each regulated by an internal 1.27V reference and external RSET resistor. It eliminates switching losses by avoiding boost converters or charge pumps, relying instead on ultra-low dropout operation directly from battery voltage.
Its Dynamic Average Matching™ (DAM™) architecture multiplexes voltage references to maintain ±1.5% typical channel-to-channel current matching across the full 49-level dimming range. The single-wire DC pin controls mode selection (Count Up/Down), shutdown (≥1260µs low), presetting (5–75µs window), and brightness steps with precise pulse-width timing requirements (2–32µs high/low).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 5.5V - compatible with single-cell Li-ion (3.6V nominal) and USB-powered systems without LDO pre-regulation. |
| Dropout Voltage | 40mV at 20mA - enables direct battery drive of WLEDs, eliminating EMI and efficiency loss from switching regulators. |
| Current Matching | ±1.5% typical - ensures uniform luminance across all four LED channels under varying temperature and supply conditions. |
| Brightness Levels | 49 logarithmically spaced steps - matches human eye perception, reducing visible stepping during dimming transitions. |
| Digital Control Interface | Single-wire DC pin with defined timing windows (tMODE_UP: 100–160µs; tSHUTDOWN: ≥1260µs) - enables microcontroller GPIO-based dimming without dedicated PWM peripherals. |
| Junction Temp Range | –40°C to +125°C - supports operation in thermally constrained handheld enclosures and automotive-adjacent environments. |
| Thermal Resistance | θJA = 90°C/W (2mm × 2mm Thin MLF®) - requires minimal PCB copper area for thermal relief in space-constrained layouts. |
Pinout & Package
The MIC2842AYMT-TR is housed in a 2mm × 2mm, 10-pin Thin MLF® (MT) leadless package with exposed thermal pad (EPAD) for enhanced heat dissipation. Pin 1 is marked with ▲ identifier; EPAD must be connected to GND for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power input | Supplies both linear drivers and internal circuitry; requires ≥1µF ceramic bypass capacitor to GND for stability. |
| DC (Pin 2) | Digital control input | Single-wire interface for enable, dimming, mode change, and shutdown; must not float - 200kΩ pull-down recommended. |
| RSET (Pin 3) | Current programming node | Sets peak LED current via external resistor (e.g., 20.5kΩ → 20mA); internal 1.27V reference enables accurate ILED calculation. |
| GND (Pin 4) | Power ground | Common return path for drivers and control logic; low-impedance routing critical for noise immunity and regulation accuracy. |
| N/C (Pins 5,6) | No-connect | Internally unconnected; no external connection required or recommended. |
| D4–D1 (Pins 7–10) | LED cathode drivers | Four independent current-sink outputs; each drives one WLED cathode while anode connects to VIN - supports parallel operation for higher-current flash applications. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Average Matching™ (DAM™) | Ensures ±1.5% typical current matching across all four channels over full dimming range and temperature, eliminating visible brightness gradients in multi-LED displays. |
| Single-wire digital dimming | Reduces MCU pin count and firmware complexity - replaces multi-pin PWM or I²C interfaces with precise edge-triggered commands on one GPIO. |
| Ultra-low dropout operation | 40mV at 20mA allows direct battery drive of WLEDs, removing need for inefficient boost converters and associated EMI filters and inductors. |
| Phase-shifted channel switching | D1–D4 outputs are driven 60° out-of-phase at ~700Hz, reducing peak input current ripple and conducted EMI in shared power rails. |
| Presettable startup brightness | Enables initialization to any of 49 levels (0–48) before first enable - avoids default full-brightness flash during boot, improving user experience in portable devices. |
Applications
| Mobile Handset Backlighting | GPS Navigation Device Display |
|---|---|
Use Scenario: Driving four WLEDs behind a 3.5-inch TFT LCD in a smartphone with Li-ion battery supply. IC Role / Device Role / Timing Role: Linear current sink per channel, regulated by RSET and controlled via single-wire DC pulses; maintains constant brightness across battery discharge (3.0–4.2V). Use Value: Eliminates boost converter losses, extending talk time by >12% versus switched alternatives while ensuring uniform screen illumination. | Use Scenario: Illuminating a sunlight-readable 4.3-inch WVGA display in an automotive-grade portable navigation unit. IC Role / Device Role / Timing Role: Four-channel WLED driver with –40°C to +125°C operation; DAM™ matching preserves display homogeneity during thermal cycling. Use Value: Delivers stable luminance without thermal derating or brightness drift, meeting OEM display uniformity specs (<±5% variation) across operating temperature. |
| MP3 Player Keypad Lighting | Camera Flash Auxiliary Driver |
Use Scenario: Providing soft, adjustable backlighting for tactile rubber keypad in a compact audio player. IC Role / Device Role / Timing Role: Low-noise linear driver with 49-step logarithmic dimming; DC pin toggled by baseband processor for ambient-light-adaptive brightness. Use Value: Enables silent, flicker-free keypad illumination with zero RF interference - critical for audio signal integrity in portable media devices. | Use Scenario: Parallel-driving a single high-brightness WLED (e.g., 80mA) using all four D1–D4 outputs in a compact camera module. IC Role / Device Role / Timing Role: Configured in high-current parallel mode; RSET sets per-channel current, total output = 4× individual channel. Use Value: Achieves torch-mode flash intensity without external MOSFETs or complex current-sharing circuits - reduces BOM count and PCB area by 30% vs discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3530TMX/NOPB | 32-step I²C-controlled 4-channel driver; 60mV dropout at 20mA; requires two-wire interface and external VREF. | Requires I²C host controller and additional support components; lacks single-wire simplicity and phase-shifted EMI reduction. | Choose when system already uses I²C infrastructure and needs programmable current per channel - not drop-in for MIC2842AYMT-TR's GPIO-based control. |
| TPS61165DRVR | Inductive boost WLED driver with 1.2MHz switching; 90% efficiency; supports up to 10 LEDs in series. | Generates switching noise and requires inductor/capacitor filtering; unsuitable for noise-sensitive audio or RF sections. | Choose only when input voltage is <3.0V (e.g., 2.7V alkaline) or when driving >4 LEDs in series - incompatible with MIC2842AYMT-TR's linear, low-EMI architecture. |
Compared with LM3530TMX/NOPB and TPS61165DRVR, the MIC2842AYMT-TR uniquely combines single-wire control, ±1.5% matching, and 40mV dropout in a 2mm × 2mm package - making it optimal for space- and noise-constrained Li-ion portable designs where simplicity and uniformity are prioritized over multi-protocol flexibility or ultra-low input voltage support.
Availability
MIC2842AYMT-TR is available at Aetrix Electronics and suitable for mobile handset backlighting, GPS display illumination, and portable media player keypad lighting requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MIC2842AYMT-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 headquartered in San Jose, CA, specializing in power management, LED drivers, and timing solutions before its acquisition by Microchip Technology in 2015.
The MIC2842A product line was engineered specifically for high-efficiency, low-EMI backlighting in battery-powered consumer electronics - emphasizing linear regulation, precision current matching, and minimal external component count.
FAQ
What is the maximum LED current per channel supported by the MIC2842AYMT-TR?
The MIC2842AYMT-TR supports up to 20mA per channel when configured with a 20.5kΩ RSET resistor at 100% duty cycle. Peak current scales inversely with RSET value per the formula ILED (mA) = 410 × ADC / RSET (kΩ), where ADC is average duty cycle. At lower brightness levels (e.g., level 0), average current drops to 0mA, while peak current remains fixed at 60% or 100% of the RSET-set value depending on the level range.
Does the MIC2842AYMT-TR require an external clock or oscillator?
No, the MIC2842AYMT-TR does not require an external clock or oscillator. It integrates an internal ~700Hz oscillator used for digital dimming waveform generation and phase-shifted channel timing. All timing-critical functions - including tSHUTDOWN, tMODE_UP, and tPROG_HIGH - are derived from this internal clock, eliminating external timing components and simplifying layout.
Can unused LED driver channels on the MIC2842AYMT-TR be left floating?
Yes, unused LED driver channels (D1–D4) on the MIC2842AYMT-TR may be left unconnected. The device maintains proper regulation on active channels regardless of how many drivers are utilized. However, the DC pin must never be left floating - a 200kΩ pull-down resistor is recommended to prevent indeterminate output states during power-up or sleep modes.
How does the MIC2842AYMT-TR achieve ±1.5% current matching across channels?
The MIC2842AYMT-TR achieves ±1.5% typical current matching using Dynamic Average Matching™ (DAM™), which multiplexes four precision voltage references to dynamically calibrate each current mirror in real time. This architecture compensates for process, voltage, and temperature variations across channels - unlike static trimming methods - ensuring consistent matching across the entire 49-level dimming range and –40°C to +125°C junction temperature.
Is the MIC2842AYMT-TR pin-compatible with other Micrel WLED drivers like the MIC2843A?
No, the MIC2842AYMT-TR is not pin-compatible with the MIC2843A. While both belong to the same family and share functional similarities, the MIC2843A is a high-current flash driver with different pin configuration (e.g., dedicated flash enable, higher current capability), distinct absolute maximum ratings, and separate thermal design requirements. Substitution requires PCB layout revision and validation of timing, current, and thermal margins.
MIC2842AYMT-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-UFDFN Exposed Pad, 10-TMLF®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 20mA
- Frequency:
- -
- Dimming:
- Single-Wire
- Applications:
- Backlight, Camera Flash
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TMLF® (2x2)
MIC2842AYMT-TR FAQ
1.How can I place an order for MIC2842AYMT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2842AYMT-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 MIC2842AYMT-TR reliable?
The price and inventory of MIC2842AYMT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2842AYMT-TR is usually 5 days.
3.What payment methods are accepted for MIC2842AYMT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2842AYMT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2842AYMT-TR?
MIC2842AYMT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2842AYMT-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 MIC2842AYMT-TR?
For technical support, including MIC2842AYMT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2842AYMT-TR requirements.
6.How does Aetrix verify that MIC2842AYMT-TR is sourced from the original manufacturer or authorized distributors?
All MIC2842AYMT-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 MIC2842AYMT-TR meets industry standards.
7.What is the process for return or replacement of MIC2842AYMT-TR?
All MIC2842AYMT-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2842AYMT-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 MIC2842AYMT-TR part is unused and in its original packaging.
Return procedure for MIC2842AYMT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC2842AYMT-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
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
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BCR420UFD-7
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BCR421UFD-7
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