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Microchip Technology MIC2843AYMT-TR
- Part No.:
- MIC2843AYMT-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 10-UFDFN Exposed Pad, 10-TMLF®
- Datasheet:
-
MIC2843AYMT-TR.pdf
- Description:
- IC LED DRVR LIN DIM 20MA 10TMLF
- Quantity:
- Payment:
- Shipping:
Inventory:3,172
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Product details
Overview
MIC2843AYMT-TR from Micrel is a high-efficiency 6-channel linear white LED (WLED) driver IC designed for portable display and keypad backlighting, as well as camera flash applications. It delivers constant current up to 20mA per channel with 40mV dropout at 20mA, ±1.5% typical current matching across all six channels, and supports Ultra Fast PWM dimming from 200Hz to 500kHz.
For engineers reviewing the MIC2843AYMT-TR datasheet, MIC2843AYMT-TR pinout, MIC2843AYMT-TR application, or MIC2843AYMT-TR equivalent, key selection criteria include linear WLED driver architecture, DAM™-enabled channel matching, RSET-based current programming, Thin MLF® package thermal performance, and END-pin PWM/enable dual-function interface.
Technical Context
The MIC2843AYMT-TR implements six independent linear current sources controlled by a shared 1.27V internal reference and external RSET resistor. Its Dynamic Average Matching™ (DAM™) architecture multiplexes four voltage references to achieve ±1.5% typical channel matching across full dimming range - not dependent on number of active channels.
Dimming is executed via PWM signal applied directly to the END pin, supporting both low-frequency (200Hz–20kHz, 1–100% duty cycle) and ultra-fast (20kHz–500kHz) modes. The device enters low-IQ sleep mode if END remains low >24ms, and features 0.3µs current source transient time (10%–90%) for rapid response in flash applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 5.5V - compatible with single-cell Li-ion/Li-poly battery systems without boost conversion. |
| Dropout Voltage | 40mV at 20mA - enables direct battery drive, eliminating switching noise and efficiency loss from charge pumps. |
| Current Matching | ±1.5% typical - ensures uniform illumination across all six WLEDs under varying temperature and load conditions. |
| PWM Frequency Range | 200Hz to 500kHz - supports flicker-free dimming at high frequencies and legacy low-frequency control interfaces. |
| Thermal Resistance θJA | 90°C/W - defined for 2mm × 2mm Thin MLF® package, enabling predictable junction temperature rise in compact layouts. |
| Shutdown Current | 0.01µA to 1µA - minimizes battery drain during system standby or sleep states. |
| Current Accuracy | ±1.5% typical - guarantees consistent brightness calibration across production units using same RSET value. |
Pinout & Package
Package: 10-pin 2mm × 2mm Thin MLF® (MT), RoHS-compliant, NiPdAu lead finish, halogen-free mold compound, exposed thermal pad (EPAD) to be connected to GND.
| 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. |
| END (Pin 2) | Enable / PWM input | Dual-function pin: logic enable (high = active) and PWM dimming input; floating prohibited; 200kΩ pull-down recommended. |
| RSET (Pin 3) | Current reference setting | Connects to GND via resistor to set master current; ILED(mA) = 410 × D / RSET(kΩ), where D = duty cycle. |
| GND (Pin 4) | Analog/digital ground return | Low-impedance return path for all drivers and control circuitry; must be routed with minimal loop area. |
| D6–D1 (Pins 5–10) | LED cathode current sinks | Each drives one WLED cathode; anodes connect to VIN; unused pins left unconnected; parallel operation supported for higher current. |
| EPAD | Thermal pad | Not internally connected; must be soldered to PCB GND plane for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Average Matching™ (DAM™) | Enables ±1.5% typical channel-to-channel current matching across full dimming range and temperature, critical for uniform LCD backlighting. |
| Ultra Fast PWM™ interface | Accepts 200Hz–500kHz PWM signals on END pin, eliminating need for external PWM generators or microcontroller GPIO expansion. |
| Low dropout linear regulation | 40mV dropout at 20mA allows direct battery drive - avoids EMI, component count, and efficiency loss of boost converters. |
| Configurable per-channel current | Single RSET resistor sets identical current for all channels; parallel connection of D1–D6 enables up to 1.5A flash current (e.g., 250mA × 6). |
| Integrated shutdown delay | Prevents backlight flicker during low-frequency PWM by maintaining internal bias during dimming transitions. |
Applications
| LCD Display Backlighting | Handset Keypad Illumination |
|---|---|
Use Scenario: Driving six series-connected or individually wired WLEDs behind a 3.5″–5″ smartphone or PDA LCD panel. IC Role / Device Role / Timing Role: Linear current sink per channel, regulated by RSET and modulated by END-pin PWM for brightness control. Use Value: Delivers uniform luminance without color shift or visible banding, enabled by ±1.5% DAM™ matching and sub-1µs current transients. | Use Scenario: Illuminating alphanumeric keys on mobile handsets or ruggedized industrial handhelds with discrete WLEDs. IC Role / Device Role / Timing Role: Six independent constant-current sources, each driving one or more small-form-factor WLEDs. Use Value: Eliminates need for individual current-limiting resistors and reduces BOM count while maintaining precise brightness consistency. |
| Digital Camera Flash | Portable Media Player Backlight |
Use Scenario: High-current torch/flash mode using paralleled D1–D6 outputs to drive a single high-brightness WLED at up to 1.5A. IC Role / Device Role / Timing Role: Synchronized current source array delivering fast-rising (0.3µs) and fast-falling (0.3µs) LED current pulses. Use Value: Enables bright, short-duration flash without thermal throttling or voltage droop, leveraging 40mV dropout and 90°C/W thermal design. | Use Scenario: Backlighting OLED or TFT displays in MP3 players, GPS units, or e-readers powered by 3.7V Li-ion batteries. IC Role / Device Role / Timing Role: Low-noise, non-switching WLED driver ensuring clean audio and RF performance in battery-constrained devices. Use Value: Removes switching ripple and EMI interference that would otherwise degrade analog audio stages or GPS receiver sensitivity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear WLED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3530TMX/NOPB | 4-channel linear WLED driver; I²C interface for digital dimming; no Ultra Fast PWM™ support; 60mV dropout at 20mA. | Requires microcontroller I²C bus; less suitable for simple GPIO/PWM-only systems; lower channel count limits multi-zone backlighting. | Select when digital control granularity and closed-loop ambient light integration are required over pure PWM simplicity. |
| TPS61165DRVR | Inductive boost WLED driver; 1.2MHz switching frequency; 30V output capability; supports up to 10 LEDs in series. | Introduces switching noise and EMI; requires inductor and diode; higher efficiency only when VLED > VBAT; unsuitable for noise-sensitive audio/RF sections. | Select only when driving high-VF WLED strings exceeding battery voltage; avoid where low-noise linear operation is mandatory. |
Compared with LM3530TMX/NOPB and TPS61165DRVR, the MIC2843AYMT-TR provides superior channel matching (±1.5% vs. ±2.5%), lower dropout (40mV vs. 60mV), and native high-frequency PWM compatibility - making it optimal for compact, noise-sensitive, six-WLED backlighting where layout space and EMI are constrained.
Availability
MIC2843AYMT-TR is available at Aetrix Electronics and suitable for LCD display backlighting, handset keypad illumination, and digital camera flash applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC2843AYMT-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 MIC2843A product line was engineered specifically for high-precision, low-noise portable lighting - targeting battery-powered devices where EMI, efficiency, and optical uniformity are critical design constraints.
FAQ
What is the maximum WLED forward voltage the MIC2843AYMT-TR can support?
The MIC2843AYMT-TR does not regulate forward voltage - it regulates current. Maximum supported WLED forward voltage equals VIN minus dropout (40mV at 20mA). With VIN = 5.5V, it supports WLED strings up to ~5.46V. Each WLED must be connected anode-to-VIN, cathode-to-Dx, so total string VF must remain ≤ VIN − VDROPOUT. The MIC2843AYMT-TR itself imposes no upper VF limit beyond this constraint.
How do I calculate the RSET resistor value for a target LED current using the MIC2843AYMT-TR?
Use the formula ILED(mA) = 410 × D / RSET(kΩ), where D is PWM duty cycle (e.g., D = 1 for 100%). For 20mA at full brightness, RSET = 410 / 20 = 20.5kΩ. The MIC2843AYMT-TR's internal 1.27V reference and precision current mirror ensure this calculation holds across temperature and process variation.
Can unused channels on the MIC2843AYMT-TR be left floating?
Yes - unused D1–D6 pins may be left unconnected. The MIC2843AYMT-TR maintains proper regulation on active channels regardless of how many drivers are utilized. No external termination or dummy loads are required. However, the END pin must never be left floating; a 200kΩ pull-down resistor is recommended for robust enable/PWM operation.
Does the MIC2843AYMT-TR support parallel operation of multiple channels for higher current drive?
Yes - the MIC2843AYMT-TR supports parallel connection of any combination of D1–D6 outputs to increase per-LED current. When all six channels are paralleled with RSET = 1.65kΩ, the MIC2843AYMT-TR delivers up to 1.5A for camera flash applications. Current scales linearly: ITOTAL = 6 × (410 × D / RSET(kΩ)).
What is the function of the EPAD on the MIC2843AYMT-TR package?
The EPAD is an exposed thermal pad on the underside of the 2mm × 2mm Thin MLF® package. It is not internally connected to any die node and must be soldered to a PCB GND plane to provide thermal conduction and EMI shielding. Proper EPAD connection reduces junction temperature by up to 25°C and improves electromagnetic immunity - essential for reliable operation in high-current or thermally constrained designs using the MIC2843AYMT-TR.
MIC2843AYMT-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:
- 6
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 20mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight, Camera Flash
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TMLF® (2x2)
MIC2843AYMT-TR FAQ
1.How can I place an order for MIC2843AYMT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2843AYMT-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 MIC2843AYMT-TR reliable?
The price and inventory of MIC2843AYMT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2843AYMT-TR is usually 5 days.
3.What payment methods are accepted for MIC2843AYMT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2843AYMT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2843AYMT-TR?
MIC2843AYMT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2843AYMT-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 MIC2843AYMT-TR?
For technical support, including MIC2843AYMT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2843AYMT-TR requirements.
6.How does Aetrix verify that MIC2843AYMT-TR is sourced from the original manufacturer or authorized distributors?
All MIC2843AYMT-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 MIC2843AYMT-TR meets industry standards.
7.What is the process for return or replacement of MIC2843AYMT-TR?
All MIC2843AYMT-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2843AYMT-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 MIC2843AYMT-TR part is unused and in its original packaging.
Return procedure for MIC2843AYMT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC2843AYMT-TR Tags
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