Analog Devices Inc./Maxim Integrated MAX20069GTLA/V+T

Overview

MAX20069GTLA/V+T from Maxim Integrated is an automotive-grade, I²C-controlled 4-channel LED backlight driver and 4-output TFT-LCD bias power IC. It integrates a buck-boost converter (for VNEG), boost converter (for VPOS), two gate-driver charge pumps (+28V/–21.5V), and a boost/SEPIC LED driver supporting up to 150mA per string across four channels. It operates from 2.8V–5.5V for TFT supplies and 4.5V–42V for LED input, targeting central information displays and instrument clusters.

For engineers reviewing the MAX20069GTLA/V+T datasheet, MAX20069GTLA/V+T pinout, MAX20069GTLA/V+T application, or MAX20069GTLA/V+T equivalent, key selection considerations include its dual-domain sequencing control (SEQ pin or I²C), phase-shift dimming capability (500ns min PWM pulse), adaptive voltage optimization for LED sinks, integrated open/short diagnostics, and AEC-Q100 qualification for automotive ambient operation (–40°C to +105°C).

Technical Context

The MAX20069GTLA/V+T implements independent regulation paths: a synchronous boost converter generates up to +18V at 150mA for positive source drivers; an inverting buck-boost delivers tightly regulated –VPOS (down to –7V) at 100mA for negative source drivers. Gate drivers use regulated charge pumps delivering ±28V/±21.5V at 3mA each.

Its LED driver employs a programmable-frequency (440kHz/2.2MHz) boost/SEPIC controller with four current-sink channels, each supporting 150mA max with logic-controlled PWM dimming (10,000:1 ratio at 200Hz), phase-shifted switching, and adaptive voltage headroom control to minimize power loss in the current sinks.

Key Specifications

Pinout & Package

MAX20069GTLA/V+T is housed in a 40-pin, 6mm × 6mm TQFN package with exposed thermal pad (EP). The package supports high-power dissipation in automotive environments and requires solder paste stencil design per JEDEC MO-220.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TFT-LCD bias and multi-channel LED driver applications.

Compared with MAX20069GTLA/V+T, MAX25530ATPA/VY+ reduces integration but simplifies layout for LED-only use, while TPS65150RGER offers lower cost at the expense of automotive compliance, diagnostics, and four-channel dimming flexibility-making MAX20069GTLA/V+T the only option meeting full ASIL-B–aligned display power requirements.

Availability

MAX20069GTLA/V+T is available at Aetrix Electronics and suitable for automotive central information displays, instrument clusters, and head-up displays requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.

Supply support for MAX20069GTLA/V+T 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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications systems.

The MAX20069GTLA/V+T belongs to Maxim's automotive display power management product line, engineered specifically to consolidate TFT bias and multi-string LED backlight functions into a single AEC-Q100–qualified IC for next-generation digital cockpits.

FAQ

What is the input voltage range for the TFT-LCD power section of the MAX20069GTLA/V+T?

The MAX20069GTLA/V+T accepts 2.8V to 5.5V on its VIN pin to power the internal boost and buck-boost converters that generate VPOS and VNEG. This range supports direct connection to automotive 3.3V or 5V rails and remains functional during cold-crank events down to 2.8V, ensuring uninterrupted TFT bias operation in demanding automotive environments.

Does the MAX20069GTLA/V+T support I²C-based dynamic adjustment of VPOS and VNEG?

Yes, the MAX20069GTLA/V+T supports real-time I²C register writes to adjust VPOS output voltage. VNEG is automatically tracked to –VPOS (with minimum –7V limit), so adjusting VPOS via I²C inherently controls VNEG. This enables closed-loop brightness calibration and temperature-compensated bias tuning without external resistors.

How does the MAX20069GTLA/V+T implement open-string and short-circuit diagnostics?

The MAX20069GTLA/V+T monitors each LED channel's current-sink voltage drop and compares it against thresholds. An open string triggers high-voltage detection (>95% of LED string voltage), while short-to-GND or shorted-LED conditions cause abnormally low voltage. Faults are latched and reported via FLTB pin assertion and I²C status registers, enabling ASIL-B–compliant error recovery.

Can the MAX20069GTLA/V+T drive more than four LED strings?

No, the MAX20069GTLA/V+T integrates exactly four current-sink channels, each rated for up to 150mA. Parallel connection of channels is possible only when phase-shift dimming is disabled and external current-sharing resistors are added-but this is not recommended for production due to mismatch-induced current imbalance and reduced diagnostic coverage.

What thermal management features does the MAX20069GTLA/V+T include?

The MAX20069GTLA/V+T includes thermal foldback and shutdown protection triggered at +150°C junction temperature. It also supports low-quiescent-current standby mode (<25µA) and adaptive voltage optimization to minimize power dissipation in LED current sinks-reducing thermal load by up to 40% compared to fixed-headroom designs.