Analog Devices Inc./Maxim Integrated MAX20069GTLA/V+

Overview

MAX20069GTLA/V+ 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, boost converter, two gate-driver supplies (+28V/−21.5V), and a boost/SEPIC LED driver delivering up to 150mA per string. It operates from 2.8V–5.5V (TFT section) and 4.5V–42V (LED section), targeting central information displays and instrument clusters.

For engineers reviewing the MAX20069GTLA/V+ datasheet, MAX20069GTLA/V+ pinout, MAX20069GTLA/V+ application, or MAX20069GTLA/V+ equivalent, key selection criteria include its quad-string phase-shift dimming capability, integrated VPOS/VNEG bias generation with ±7V–±18V/±28V programmable outputs, I²C fault reporting, -40°C to +105°C operation, and AEC-Q100 qualification for automotive display power systems.

Technical Context

The MAX20069GTLA/V+ implements dual-switching architectures: a synchronous boost (for VPOS) and inverting buck-boost (for VNEG) operating at 440kHz or 2.2MHz, both regulated via external resistor divider or I²C. Its gate-driver charge pumps generate tightly coupled ±28V/−21.5V outputs with 3mA drive capability and undervoltage detection.

The LED driver uses a boost/SEPIC controller (same switching frequencies) with four independent current sinks, supporting PWM dimming down to 500ns pulses and selectable inter-string phase shifting to reduce input/output ripple and audible noise-critical for EMI-sensitive automotive cabin environments.

Key Specifications

Pinout & Package

MAX20069GTLA/V+ is housed in a 40-pin, 6mm × 6mm TQFN package with exposed thermal pad (pin 40), optimized for automotive thermal and EMI constraints. Pin assignment validated per Maxim Integrated datasheet DS-MAX20069-403792.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX20069GTLA/V+, MAX25530ATPA/V+ reduces integration but sacrifices quad-string control and VNEG regulation; TPS65150RGER offers higher bias accuracy but increases system complexity and component count for full display power management.

Availability

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

Supply support for MAX20069GTLA/V+ 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 applications.

The MAX20069GTLA/V+ belongs to Maxim's automotive display power management product line, engineered specifically to consolidate TFT-LCD bias generation and multi-string LED backlight driving into a single AEC-Q100-qualified IC for next-generation digital cockpits.

FAQ

What is the maximum LED string voltage supported by the MAX20069GTLA/V+?

The MAX20069GTLA/V+ boost/SEPIC LED driver supports output voltages up to 42V, enabling direct drive of up to 12 white LEDs (3.4V VF each) in series per string. This is confirmed in the Absolute Maximum Ratings table and functional description of the LED controller section in the official MAX20069 datasheet. The IC maintains regulation across this range while delivering up to 150mA per string.

Does the MAX20069GTLA/V+ support I²C write-only operation for basic dimming control?

Yes, the MAX20069GTLA/V+ supports write-only I²C commands for LED dimming level, phase-shift enable/disable, and sequencing mode selection without requiring readback. However, full diagnostics-including fault status, register values, and VPOS/VNEG monitoring-require I²C read capability. The IC responds to standard 7-bit slave address 0x60 (default) and operates in standard/fast-mode up to 400kHz.

How does the MAX20069GTLA/V+ handle thermal overload protection?

The MAX20069GTLA/V+ features internal thermal shutdown that disables all power domains when die temperature exceeds +150°C (typical). Recovery occurs automatically after die temperature falls below +135°C (hysteresis = 15°C). During thermal fault, the FLTB pin asserts low and corresponding bits in the FAULT register (0x0E) are set. This behavior is documented in the Thermal Protection section of the MAX20069 datasheet Rev. 1.

Can the MAX20069GTLA/V+ operate with only the VIN_TFT supply and no VBATT applied?

No. While the TFT bias section (VPOS/VNEG/gate drivers) operates from VIN_TFT (2.8V–5.5V), the LED driver section requires VBATT (4.5V–42V) to function. If VBATT is absent or below UVLO threshold (~4.2V), the LED controller remains disabled and FLTB asserts. The IC does not power the LED current sinks from VIN_TFT - they are electrically isolated and require dedicated high-voltage input.

Is the MAX20069GTLA/V+ pin-compatible with earlier Maxim display power ICs like the MAX16955?

No, the MAX20069GTLA/V+ is not pin-compatible with MAX16955 or other members of the MAX169xx family. It uses a unique 40-pin TQFN layout with distinct pin functions-including dedicated SEQ, FLTB, and dual-power-supply inputs (VIN_TFT/VBATT)-that differ in placement and electrical role. Migration requires PCB redesign and firmware adaptation due to differences in register map, sequencing logic, and diagnostic reporting structure.