Analog Devices Inc./Maxim Integrated MAX9660ATA+T

Overview

MAX9660ATA+T from Maxim Integrated is a 7-bit programmable VCOM reference IC for TFT-LCD panel biasing, integrating a current-sinking DAC, nonvolatile MOTP memory (30× write), and a high-current VCOM buffer with ±900mA peak output capability. It operates from 2.5V–3.6V digital supply and 8V–20V analog supply, and uses I²C interface for DAC/MOTP programming.

For engineers reviewing the MAX9660ATA+T datasheet, MAX9660ATA+T pinout, MAX9660ATA+T application, or MAX9660ATA+T equivalent, key selection criteria include VCOM output error (±22mV), load regulation (±0.2mV/mA), short-circuit protection, MOTP endurance, and TDFN-EP thermal performance in high-current LCD timing systems.

Technical Context

The MAX9660ATA+T implements a ratiometric 7-bit current DAC whose full-scale sink current is set by external RSET (6.75kΩ–135kΩ), enabling programmable VCOM voltage generation across an external resistor-divider. The DAC output drives an integrated rail-to-rail VCOM buffer capable of sourcing/sinking up to ±900mA with 45V/µs slew rate and 20MHz bandwidth.

It embeds 30-cell MOTP memory that stores the DAC code at power-up; each write requires ≤500ms burn time and is acknowledged via I²C. The I²C interface supports 400kHz operation, uses slave address 0x9E/0x9F, and distinguishes DAC vs. MOTP writes via the M-bit in the data byte.

Key Specifications

Pinout & Package

MAX9660ATA+T is housed in an 8-pin TDFN-EP (3mm × 3mm, 0.5mm pitch) package with exposed pad soldered to GND for thermal management and EMI reduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX9660ATA+T, MAX9661ATA+T offers identical functionality at reduced MOTP endurance, while TPS65150RGER trades embedded nonvolatility and VCOM-only optimization for broader power integration - making MAX9660ATA+T optimal for high-precision, EEPROM-free VCOM biasing in discrete LCD timing designs.

Availability

MAX9660ATA+T is available at Aetrix Electronics and suitable for TFT-LCD panel manufacturing, industrial HMI development, and medical imaging display design requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for MAX9660ATA+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 demanding industrial, automotive, and consumer applications.

The MAX9660 belongs to Maxim's LCD timing and bias IC product line, engineered specifically to replace mechanical VCOM potentiometers with programmable, high-current, nonvolatile solutions for TFT-LCD panels.

FAQ

What is the maximum allowable analog supply voltage for MAX9660ATA+T?

The absolute maximum analog supply voltage (AVDD) for MAX9660ATA+T is +22V, but the recommended operating range is 8V to 20V per the datasheet. Operation above 20V risks exceeding thermal limits and degrading long-term reliability, especially under full-load conditions. The device's VCOM output swing and PSRR are characterized within the 8V–20V range, and sustained use beyond 20V voids guaranteed specifications. Always observe the 22V absolute max rating to prevent permanent damage.

How does the RSET resistor affect the VCOM voltage range in MAX9660ATA+T?

The RSET resistor connected from SET pin to GND determines the full-scale sink current as I_FS = V_AVDD/(20 × RSET), which directly scales the VCOM output range. For example, with RSET = 6.8kΩ and AVDD = 16V, I_FS ≈ 118µA, yielding a VCOM range of ~0.2V to ~15.8V using typical R1/R2 divider values. Smaller RSET increases full-scale current and lowers minimum VCOM; larger RSET reduces current and raises minimum VCOM. The datasheet specifies RSET from 6.75kΩ to 135kΩ to maintain DAC linearity and buffer stability.

Can MAX9660ATA+T operate with DVDD and AVDD powered independently, and what is the correct power sequencing?

Yes, MAX9660ATA+T requires independent DVDD (2.5V–3.6V) and AVDD (8V–20V) supplies, and strict power sequencing is mandatory. DVDD must be applied and stabilized before AVDD is ramped up; this ensures the MOTP value loads correctly into the DAC register at power-up (default 0x40). During power-down, AVDD must be removed first down to 0V before DVDD is shut off. Violating this sequence may cause undefined VCOM output or latch-up. The evaluation kit layout and bypassing scheme (0.1µF + 10µF on AVDD, 0.1µF on DVDD) support robust sequencing compliance.

What is the purpose of the M-bit in the I²C data frame for MAX9660ATA+T?

The M-bit (bit B0) in the second I²C data byte determines whether the 7-bit payload is written to the volatile DAC register (M = 1) or to nonvolatile MOTP memory (M = 0). When M = 1, the value updates the live VCOM output immediately but is lost on power cycle. When M = 0, the same value is burned into MOTP memory after a 500ms programming interval and automatically restores at next power-up. This dual-register architecture enables both runtime tuning and persistent calibration - a core differentiator of MAX9660ATA+T versus basic DACs or EEPROM-dependent solutions.

Does MAX9660ATA+T provide any built-in protection against output short circuits?

Yes, MAX9660ATA+T integrates output short-circuit protection on its VCOM pin. When VCOM is shorted to GND or AVDD, the output current is limited to ±900mA peak (1µs pulsed), preventing bond-wire failure or thermal runaway. This protection operates continuously and does not require external components. Additionally, the device features soft-start to limit inrush current during power-up, reducing stress on the VCOM buffer and external capacitive loads. These protections are validated across the full −40°C to +125°C operating range and are specified in the Absolute Maximum Ratings and Electrical Characteristics tables.