Analog Devices Inc./Maxim Integrated MAX9650AUA+

Overview

The MAX9650AUA+ from Maxim Integrated is a single-channel rail-to-rail input/output operational amplifier optimized as a high-current VCOM driver for TFT-LCD panels, delivering ±1.3A transient peak output current, 40V/μs slew rate, and 35MHz bandwidth while operating from 6V to 20V supply. It stabilizes common-mode voltage in large-format LCD backplanes under 120Hz frame rates and full HD resolution.

For engineers reviewing the MAX9650AUA+ datasheet, MAX9650AUA+ pinout, MAX9650AUA+ application, or MAX9650AUA+ equivalent, this page provides verified package mapping (8-pin μMAX-EP), thermal performance data (θJA = 77.6°C/W on four-layer board), output short-circuit protection, and confirmed VCOM-specific settling time (2.0μs to 0.1%) - all critical for LCD timing integrity and panel yield assurance.

Technical Context

The MAX9650AUA+ implements a BiCMOS-based op-amp architecture with rail-to-rail input stage using complementary differential pairs and a robust output stage capable of sourcing/sinking 1.3A into capacitive loads up to 150nF. Its 35MHz bandwidth and 40V/μs slew rate are co-optimized for fast settling during VCOM voltage transitions in high-refresh-rate displays.

Thermal shutdown activates at +170°C with 15°C hysteresis, and the exposed pad (internally connected to GND) enables low-thermal-resistance heat dissipation (θJC = 5°C/W). Input offset voltage remains within ±17mV over –40°C to +125°C, ensuring stable DC bias across automotive and industrial temperature ranges.

Key Specifications

Pinout & Package

The MAX9650AUA+ is housed in an 8-pin μMAX-EP package (Outline 21-0107, Land Pattern 90-0145) with an exposed pad electrically connected to GND for enhanced thermal performance (θJA = 77.6°C/W on four-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX9650ATA+ and MAX9651AUA+, the MAX9650AUA+ offers optimal thermal performance in μMAX-EP form factor for single-VCOM applications where board area is limited but power dissipation exceeds SOT23 capability - enabling reliable operation at 80mA continuous load without derating.

Availability

The MAX9650AUA+ is available at Aetrix Electronics and suitable for large-format TFT-LCD panels, automotive instrument clusters, and industrial HMI displays requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for MAX9650AUA+ 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 and mixed-signal ICs for demanding industrial, automotive, and consumer applications - with emphasis on reliability, thermal robustness, and system-level integration.

The MAX9650AUA+ belongs to Maxim's high-current VCOM amplifier product line, engineered specifically to replace discrete MOSFET-based VCOM drivers in TFT-LCD timing subsystems while guaranteeing sub-microsecond settling and ±1.3A transient capability.

FAQ

What is the maximum continuous output current specification for the MAX9650AUA+?

The MAX9650AUA+ is rated for 80mA continuous output current per channel under specified thermal conditions (four-layer board, TA = +70°C). This value is validated in the Electrical Characteristics table and reflects safe steady-state operation without thermal shutdown activation. The MAX9650AUA+ can deliver ±1.3A transient peak current for short durations required during LCD frame updates, but sustained loading must remain within the 80mA limit to maintain reliability.

Does the MAX9650AUA+ require external compensation for stability with capacitive loads?

No, the MAX9650AUA+ is internally compensated for stability with capacitive loads up to 150nF, as confirmed in the Applications Information section and Typical Operating Characteristics. A small series resistor (e.g., 2.2Ω) may further optimize settling behavior in edge cases, but it is not required for basic functionality. Layout best practices - including grounding the exposed pad and placing 10μF + 0.1μF bypass capacitors near VDD - are sufficient for stable operation in standard TFT-LCD applications.

What is the function of the exposed pad (EP) on the MAX9650AUA+ μMAX-EP package?

The exposed pad (EP) on the MAX9650AUA+ is internally connected to GND and serves as the primary thermal conduction path from the die to the PCB. It must be soldered directly to a solid ground plane to achieve the specified θJA = 77.6°C/W (four-layer board). Leaving the EP unconnected or routing traces beneath it degrades thermal performance and risks thermal shutdown under load. The EP also improves EMI immunity by lowering ground impedance.

Can the MAX9650AUA+ operate from a dual-supply configuration?

Yes, the MAX9650AUA+ supports dual-supply operation from ±4.5V to ±10V, as stated in the Applications Information section. In dual-supply mode, both positive (VDD) and negative (GND) rails require local 10μF + 0.1μF bypass capacitors placed adjacent to their respective pins. The exposed pad may be connected to the negative supply or left floating, though grounding remains preferred for thermal performance. Rail-to-rail inputs/outputs function symmetrically across the dual-rail range.

How does thermal shutdown with hysteresis work in the MAX9650AUA+?

The MAX9650AUA+ activates thermal shutdown at +170°C junction temperature and remains off until the die cools by 15°C (to +155°C), at which point it automatically resumes operation. This hysteresis prevents oscillatory cycling during marginal thermal conditions. In typical TFT-LCD use, duty cycle is low enough that even at 1.3A peak current, average power dissipation stays below shutdown threshold - making the feature a safety net rather than an operational constraint.