Microchip Technology MIC4812YMME

Overview

MIC4812YMME from Micrel is a high-efficiency 6-channel linear white LED driver for signage lighting, delivering ±1% typical current matching and 190mV dropout at 100mA per channel with Ultra Fast PWM™ dimming down to <1% duty cycle. It operates from 3.0V–5.5V input and drives up to six 100mA WLEDs in parallel anode configurations.

For engineers reviewing the MIC4812YMME datasheet, MIC4812YMME pinout, MIC4812YMME application, or MIC4812YMME equivalent, key selection criteria include linear WLED driver architecture, DAM™-enabled channel matching, ePad MSOP thermal performance, and EN-pin PWM interface compatibility with 200Hz–500kHz control signals.

Technical Context

The MIC4812YMME implements six independent linear current sources, each mirroring a master current set by the RSET resistor (1.27V reference), enabling precise per-channel regulation without switching losses. Its Dynamic Average Matching™ (DAM™) architecture multiplexes four voltage references to maintain ±1% typical matching across full dimming range and temperature.

Dimming is implemented via PWM applied directly to the EN pin-supporting 200Hz–20kHz (1–100% linear duty cycle) and 20kHz–500kHz (non-linear but functional). Shutdown current is ≤1µA, and wake-up requires ≥60µs logic-high pulse to ensure deterministic state initialization.

Key Specifications

Pinout & Package

Package: 10-pin MSOP with exposed thermal pad (ePad), RoHS-compliant, θ_JA = 76.7°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar linear WLED driver applications.

Compared with AL8862SP-13 and TPS61165DRVR, the MIC4812YMME provides superior channel uniformity (±1% vs. ±3–5%), zero EMI, and minimal external components-but requires VIN ≥ V_LED + 190mV, limiting use to low-V_F or short-string configurations.

Availability

MIC4812YMME is available at Aetrix Electronics and suitable for billboard displays, marquee signage, and instrument cluster backlighting requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for MIC4812YMME 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 founded in 1978 and acquired by Microchip Technology in 2015; known for precision analog, timing, and power management ICs.

The MIC4812YMME belongs to Micrel's high-accuracy linear LED driver product line, designed specifically for uniform-brightness signage and display applications demanding tight current matching and robust thermal performance.

FAQ

What is the maximum LED current per channel for the MIC4812YMME?

The MIC4812YMME supports up to 100mA per channel, set by the external RSET resistor. With RSET = 8.25kΩ, the nominal peak current is 100mA at 100% duty cycle. The device maintains regulation across all six channels simultaneously, and current accuracy remains within ±1% typical over temperature and supply variation.

Does the MIC4812YMME require an external inductor or transformer?

No, the MIC4812YMME is a fully linear WLED driver and contains no switching elements. It operates without inductors, transformers, or flyback diodes - relying solely on low-dropout current sinks and an external RSET resistor. This eliminates EMI, simplifies layout, and reduces BOM cost compared to inductive boost or charge-pump alternatives.

How does the DAM™ feature improve performance in the MIC4812YMME?

DAM™ (Dynamic Average Matching™) in the MIC4812YMME uses time-multiplexed voltage references to dynamically correct for process and thermal mismatches across all six channels. As a result, the MIC4812YMME achieves ±1% typical current matching across the full dimming range and temperature - critical for eliminating visible brightness gradients in multi-module signage displays.

Can the MIC4812YMME drive LEDs with different forward voltages?

Yes - each D1–D6 output operates independently as a current sink, allowing mixed WLED types (e.g., varying V_F) to be driven simultaneously. Since the MIC4812YMME regulates current-not voltage-and features only 190mV dropout, it accommodates V_F up to VIN – 190mV. For example, at VIN = 5.0V, max V_F supported is 4.81V per string.

What is the recommended PCB layout practice for thermal management of the MIC4812YMME?

For optimal thermal performance, the ePad of the MIC4812YMME must be soldered to a solid copper ground plane covering ≥250 mm², with ≥4 thermal vias (0.3mm diameter) connecting to inner/secondary ground layers. Input capacitor C1 (2.2µF X5R/X7R) must be placed within 2mm of VIN and GND pins, and GND traces should be wide and direct to minimize impedance in the high-current return path.