Microchip Technology CL88031T-E/MF

Overview

CL88031T-E/MF from Microchip Technology is a 6-tap sequential linear LED driver IC designed for offline AC mains-powered LED lighting systems. It supports 120VAC/230VAC/277VAC nominal input with ±15% tolerance, delivers ≥2W output power, features programmable overtemperature protection with gradual thermal derating, and uses active line regulation with adjustable "knee" to maintain stable output power across input voltage variations. It targets high-efficiency LED lamps and fixtures requiring flicker reduction and phase-cut dimming compatibility.

For engineers reviewing the CL88031T-E/MF datasheet, CL88031T-E/MF pinout, CL88031T-E/MF application, or CL88031T-E/MF equivalent, key selection considerations include its 6-tap current-sinking architecture, DFN-10 thermally enhanced package with bottom heatslug, external FET gate drive capability, OTP interface for remote NTC-based thermal monitoring, and ALR pin for line-voltage adaptive regulation - all critical for robust, low-EMI, no-PFC LED driver design.

Technical Context

The CL88031T-E/MF implements self-commutating sequential regulation using six independent gate drivers (GT1–GT6), each tied to a dedicated tap on a series/parallel LED string. Regulation occurs via a single shared current sense node (CS pin), where error amplifiers activate in voltage-ordered sequence based on internal reference hierarchy (VGT6 > VGT5 > … > VGT1).

Its Active Line Regulation (ALR) circuit monitors rectified AC voltage through an external RC network to dynamically adjust the OTP limiting voltage, enabling stable output power without closed-loop feedback. Overtemperature protection operates by scaling down tap currents proportionally as an external NTC-thermistor resistance decreases, ensuring smooth, non-abrupt light-output reduction.

Key Specifications

Pinout & Package

CL88031T-E/MF is housed in a thermally enhanced 10-lead DFN package (3 mm × 3 mm × 0.9 mm) with exposed bottom thermal pad (EP) for PCB-level heat dissipation. No high-voltage pins are present; power dissipation occurs externally in FETs and LEDs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CL88030T-E/MF, the CL88031T-E/MF adds two gate drivers and expanded current-ratio tables for finer THD control and higher-power scalability; versus AL8862T-13, it offers superior thermal derating linearity and flicker-reduction circuit support - making it preferred for thermally demanding, dimmable, or globally rated fixtures.

Availability

CL88031T-E/MF is available at Aetrix Electronics and suitable for LED lamps, commercial lighting fixtures, and dimmable downlights requiring stable component supply, long-lifecycle assurance, and traceable sourcing for production programs.

Supply support for CL88031T-E/MF 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

Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with broad expertise in energy-efficient lighting control solutions.

The CL88031T-E/MF belongs to Microchip's sequential linear LED driver product line, engineered specifically for cost-sensitive, high-reliability AC-mains LED lighting where simplicity, thermal resilience, and dimming compatibility are prioritized over isolated topology complexity.

FAQ

What is the primary function of the CL88031T-E/MF in an LED lighting system?

The CL88031T-E/MF serves as a sequential linear LED driver IC that regulates current across six taps on a series/parallel LED string directly from AC mains. It replaces isolated switch-mode drivers in medium-power applications, using external FETs and a single current-sense resistor (CS pin) to achieve high efficiency, low THD, and flicker reduction - all while supporting phase-cut dimming and thermal derating. Its architecture eliminates the need for transformers, PFC circuits, or EMI filters in many designs.

How does the ALR pin on the CL88031T-E/MF improve line regulation performance?

The ALR pin on the CL88031T-E/MF connects to an external resistive divider across the rectified AC input, allowing the IC to monitor line voltage magnitude in real time. This signal adjusts the internal reference voltage used for tap current regulation, compensating for ±15% input variation. Unlike closed-loop power regulation, ALR achieves stable output power by proactively scaling references - resulting in consistent lumen output across 120VAC, 230VAC, and 277VAC systems without additional sensing circuitry.

Can the CL88031T-E/MF be used with both leading-edge and trailing-edge dimmers?

Yes, the CL88031T-E/MF is explicitly designed for compatibility with both leading-edge (TRIAC-based) and trailing-edge (electronic) phase-cut dimmers. Its internal circuitry tolerates the distorted waveforms and varying zero-crossing behavior of both types, and its ALR function prevents brightness shifts during dimmer adjustment. Application circuits in the datasheet confirm stable operation with standard residential and commercial dimmers - no external dimmer interface IC is required.

What thermal management features does the CL88031T-E/MF provide?

The CL88031T-E/MF integrates programmable overtemperature protection (OTP) that accepts voltage from an external NTC-thermistor bridge. As LED temperature rises, OTP gradually reduces all tap currents in a linear fashion - avoiding abrupt shutdown and preserving visual continuity. Combined with its DFN-10 package featuring an exposed thermal pad (EP), the CL88031T-E/MF enables direct PCB copper pour conduction, achieving 8°C/W junction-to-case thermal resistance for reliable operation in thermally constrained fixtures.

Is the CL88031T-E/MF pin-compatible with the CL88030T-E/MF?

No, the CL88031T-E/MF is not pin-compatible with the CL88030T-E/MF. While both share the same 10-lead DFN package and identical pin assignments for GT1–GT4, CS, OTP, BIAS, ALR, GND, and EP, the CL88031T-E/MF repurposes pins 5 and 6 as GT5 and GT6 - whereas CL88030T-E/MF leaves those pins as NC (no-connect). PCB layout must allocate routing for two additional gate drive traces and associated FETs to use CL88031T-E/MF in place of CL88030T-E/MF.