Analog Devices Inc./Maxim Integrated MAX9669ETI+

Overview

The MAX9669ETI+ from Maxim Integrated is a 10-bit programmable gamma reference system with integrated MTP memory, designed specifically for TFT LCD panel gamma correction and VCOM voltage generation. It delivers 16 buffered gamma reference outputs (each with 10-bit DAC + buffer) and one amplified VCOM output (10-bit DAC + op-amp), supporting analog supplies from 9V to 20V and digital supply from 2.7V to 3.6V. Its 1µs settling time, 200mA peak gamma drive, and 600mA peak VCOM drive enable stable voltage delivery during fast display transitions.

For engineers reviewing the MAX9669ETI+ datasheet, MAX9669ETI+ pinout, MAX9669ETI+ application, or MAX9669ETI+ equivalent, key selection considerations include I²C-programmable gamma/VCOM values, on-chip MTP storage (100 write cycles), channel-to-channel isolation (80dB), thermal shutdown (+160°C), and TQFN-EP package compatibility with high-current LCD biasing requirements.

Technical Context

The MAX9669ETI+ integrates seventeen 10-bit DACs - sixteen gamma channels with rail-to-rail output buffers and one VCOM channel with a dedicated operational amplifier - all sharing a common I²C interface and dual-supply architecture (AVDD/AVDD_AMP up to 20V, DVDD 2.7–3.6V). Its internal MTP memory stores factory- or user-programmed gamma and VCOM values independently of external EEPROM.

Each gamma output guarantees monotonicity, ±1 LSB INL/DNL, and 0.5 mV/mA load regulation; the VCOM amplifier provides 60 MHz bandwidth, 100 V/µs slew rate, and current limiting to protect bond wires under 600mA peak load. Thermal shutdown activates at +160°C with 15°C hysteresis, disabling all gamma outputs until die temperature drops below +145°C.

Key Specifications

Pinout & Package

MAX9669ETI+ is housed in a 28-pin Thin QFN with exposed pad (5mm × 5mm), RoHS-compliant and lead-free. The EP (exposed pad) must be connected to DGND for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar gamma reference and VCOM driver applications.

Compared with MAX9669ETI+, MAX9670ETI+ removes VCOM amplification but improves EMI robustness, while THS788IRHBT shifts complexity to external components - making MAX9669ETI+ the only single-chip solution with integrated MTP, VCOM op-amp, and thermal protection for full TFT biasing.

Availability

MAX9669ETI+ is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial HMIs, medical imaging displays, and avionics display systems requiring stable component supply, long-term calibration retention, and high-current LCD biasing capability.

Supply support for MAX9669ETI+ 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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.

The MAX9669 belongs to Maxim's TFT LCD power and timing management product line, engineered to consolidate gamma correction, VCOM generation, and calibration storage into a single high-voltage, high-current IC for next-generation display subsystems.

FAQ

What is the maximum analog supply voltage supported by the MAX9669ETI+?

The MAX9669ETI+ supports analog supply voltages up to +20V on both AVDD and AVDD_AMP pins. Absolute maximum rating is +22V, but guaranteed operation - including total output error and thermal performance - is specified from 9V to 20V. Exceeding 20V may compromise DAC linearity or trigger undervoltage lockout behavior outside datasheet conditions.

Does the MAX9669ETI+ require external EEPROM for gamma calibration storage?

No, the MAX9669ETI+ does not require external EEPROM. It integrates on-chip multiple-time programmable (MTP) memory capable of storing gamma and VCOM values permanently. This MTP supports at least 100 write cycles and retains data without external power, enabling panel-specific calibration directly on the production line.

How many I²C addresses does the MAX9669ETI+ support, and how is addressing configured?

The MAX9669ETI+ supports four I²C slave addresses determined by the logic level on the A0 pin and connection of DVDD/AGND to the A0 pin. With A0 tied to DGND, address is E8h (write) / E9h (read); with A0 tied to DVDD, address is EAh (write) / EBh (read). This allows up to two MAX9669ETI+ devices on the same I²C bus without address conflict.

What is the purpose of the VCOM_FB pin on the MAX9669ETI+?

The VCOM_FB pin is the feedback input for the integrated VCOM amplifier. It must be connected directly to the VCOM output pin to configure the amplifier as a unity-gain voltage follower. This closed-loop configuration ensures precise regulation of the VCOM voltage despite load variations and maintains stability when driving large capacitive LCD backplanes.

Can the MAX9669ETI+ drive a TFT LCD panel without additional external components?

Yes - the MAX9669ETI+ is designed as a complete gamma/VCOM reference subsystem. It requires only bypass capacitors (0.1µF on AVDD, AVDD_AMP, DVDD, and EP), pull-up resistors on SDA/SCL (≥500Ω), and proper grounding. No external DACs, op-amps, EEPROM, or level shifters are needed, significantly reducing BOM count and PCB area versus discrete solutions.