Analog Devices Inc./Maxim Integrated MAX16929FGUI/V+

Overview

MAX16929FGUI/V+ from Maxim Integrated is an automotive-grade, highly integrated TFT-LCD power supply IC featuring a 5V/3.3V buck converter (1.2A or 2A), a 2.2MHz boost converter (up to 18V, 6W), dual gate voltage regulators (GH: +20mA at 28V; GL: −24V to −2V), and a 1.8V/3.3V linear regulator controller. It operates from 4V–28V (buck) and 3V–5.5V (boost), supports spread-spectrum EMI reduction, and targets dashboard and central infotainment displays.

For engineers reviewing the MAX16929FGUI/V+ datasheet, MAX16929FGUI/V+ pinout, MAX16929FGUI/V+ application, or MAX16929FGUI/V+ equivalent, key selection criteria include its dual-gate sequencing capability via SEQ input, PGOOD fault monitoring across all rails, thermal shutdown thresholds (+175°C buck / +165°C boost), TSSOP-28EP package with exposed pad, and AEC-Q100 qualification for automotive environments.

Technical Context

The MAX16929FGUI/V+ integrates five independent power regulation blocks in one die: a current-mode buck converter with internal high-side FET and 2.1MHz switching, a current-mode boost converter with 2.2MHz fixed-frequency PWM and slope compensation (COMPI), two dedicated gate drivers (GH and DRVN) supporting external charge-pump topologies, and a feedback-controlled 1.8V/3.3V linear regulator controller driving an external NPN transistor.

Its digital control architecture enables flexible sequencing (via SEQ pin), True Shutdown™ of the boost path using an external p-channel FET (GATE pin), and coordinated fault detection - PGOOD asserts low on any rail undervoltage (e.g., VOUTB < 92%, VFBP < 85%, VFBGH < 85%, VFBGL < 85%, or VFB < 85%), overvoltage (VCP > 30.5V), or LXP overvoltage (>21V).

Key Specifications

Pinout & Package

MAX16929FGUI/V+ is housed in a 28-pin TSSOP package with exposed thermal pad (EP). The EP must be soldered to a large contiguous copper ground plane for effective heat dissipation and cannot serve as the sole electrical ground connection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TFT-LCD power supply applications.

Compared with MAX16929FGUI/V+, MAX20075ATPA/V+ offers wider input range but requires external gate bias solutions, while TPS65150RHAR provides higher boost voltage but sacrifices the flexible 1.8V/3.3V controller and digital sequencing - making MAX16929FGUI/V+ optimal for compact, fully integrated automotive TFT-LCD power systems.

Availability

MAX16929FGUI/V+ is available at Aetrix Electronics and suitable for automotive dashboards, central infotainment systems, and navigation systems requiring stable component supply, AEC-Q100-compliant sourcing, and long-term production continuity.

Supply support for MAX16929FGUI/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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.

The MAX16929FGUI/V+ belongs to Maxim's automotive power management product line, designed specifically to consolidate multiple TFT-LCD panel power rails into a single AEC-Q100-qualified IC with integrated sequencing and fault monitoring.

FAQ

What is the input voltage range supported by the MAX16929FGUI/V+ buck and boost converters?

The MAX16929FGUI/V+ buck converter operates from 4V to 28V (or 5.5V to 28V depending on version), while the boost converter accepts 3V to 5.5V on the INA pin. This dual-input architecture allows the buck to handle direct battery connections (including cold-crank down to 4V), and the boost to run from a clean 5V intermediate rail - a key design feature for automotive TFT-LCD power integrity.

How does the MAX16929FGUI/V+ implement gate voltage sequencing, and what role does the SEQ pin play?

The MAX16929FGUI/V+ uses the SEQ pin to select between two factory-defined gate-rail power-up sequences: when SEQ = VINA, GH powers first; when SEQ = GND, GL powers first. This eliminates external timing components and ensures reliable, repeatable startup behavior across temperature and voltage - critical for preventing LCD panel damage during power application.

Does the MAX16929FGUI/V+ integrate internal MOSFETs, and which converters use them?

Yes, the MAX16929FGUI/V+ integrates a high-side DMOS FET for the buck converter (R_DS(on) = 180–400mΩ) and an n-channel MOSFET for the boost converter (R_DS(on) = 110–250mΩ). These internal switches eliminate external power transistors, reducing board area and improving efficiency - confirmed in the Electrical Characteristics table under "High-Side DMOS R_{DS_ON}" and "LXP On-Resistance".

What fault conditions cause the PGOOD pin of the MAX16929FGUI/V+ to assert low?

The PGOOD pin of the MAX16929FGUI/V+ pulls low on seven defined faults: buck output <92% nominal, boost output <85% nominal, GH output <85% nominal, GL output <85% nominal, 1.8V/3.3V output <85% nominal, LXP voltage >21V, or CP voltage >30.5V. This comprehensive monitoring is explicitly listed in the "Fault Conditions and PGOOD" section of the datasheet.

Can the MAX16929FGUI/V+ generate both positive and negative gate voltages without external transistors?

No - the MAX16929FGUI/V+ requires external components for full gate bias generation: an external charge pump (e.g., MAX16910) and resistor divider for GH, and an external NPN transistor driven by DRVN for GL. The IC provides regulation control (FBGH/FBGL) and driver outputs (GH/DRVN), but not complete gate-rail power stages - as confirmed in the "Detailed Description" and "Typical Application Circuit" sections.