Analog Devices Inc./Maxim Integrated MAX1889EVKIT

Overview

MAX1889EVKIT from Maxim Integrated is an evaluation kit for the MAX1889 triple-output TFT LCD power supply IC. It implements a 500kHz/1MHz step-up regulator, positive and negative linear-regulator controllers, and integrated fault protection-including input switch control, output overload detection with timer latch, and thermal shutdown. Designed to generate +9V, +20V, and –7V outputs from a 2.7V–5.5V input, it supports ultra-thin notebook, monitor, and automotive navigation display power systems.

For engineers reviewing the MAX1889EVKIT datasheet, MAX1889EVKIT pinout, MAX1889EVKIT application, or MAX1889EVKIT equivalent, this kit enables rapid validation of TFT LCD panel power architecture-including transient response under pulsed gate-driver loads, sequencing of VMAIN/VPL/VNL rails, soft-start behavior, and fault recovery timing-using the reference design in Figure 1 of the MAX1889 datasheet.

Technical Context

The MAX1889EVKIT implements the full MAX1889 functional block diagram (Figure 2), including current-mode step-up regulation with internal N-MOSFET, dual open-drain linear-regulator drivers (DRVP/DRVN), and triple-level protection circuitry. It validates the IC's ability to post-regulate charge-pump outputs while monitoring all three regulated rails (VMAIN, VPL, VNL) and input current via OCP/OCN comparators.

It demonstrates the MAX1889's unique input switch control using an external P-channel MOSFET (P1), fault latching with 64ms timer period (VFREQ-dependent), and thermal shutdown at +160°C. The board supports both 500kHz and 1MHz switching frequencies via FREQ pin configuration and includes all recommended passive components per Table 1 of the datasheet.

Key Specifications

Availability

MAX1889EVKIT is available at Aetrix Electronics and suitable for TFT LCD display development, automotive infotainment system prototyping, and industrial HMI panel power validation requiring stable component supply and documented reference design implementation.

Supply support for MAX1889EVKIT 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 solutions for demanding applications.

The MAX1889EVKIT belongs to Maxim's display power management product line, designed specifically to accelerate development of compact, reliable, and fault-protected power architectures for active-matrix TFT LCD panels in portable and automotive environments.

FAQ

What is the primary function of the MAX1889EVKIT?

The MAX1889EVKIT is an evaluation kit that demonstrates and validates the full functionality of the MAX1889 triple-output TFT LCD power supply IC. It implements the standard application circuit (Figure 1) to generate +9V, +20V, and –7V rails from a 2.7V–5.5V input, enabling engineers to verify step-up regulation, linear post-regulation, fault protection behavior, and power-up sequencing before integrating the MAX1889 into final designs.

Does the MAX1889EVKIT include the MAX1889 IC?

Yes, the MAX1889EVKIT includes one mounted MAX1889 IC in its 16-pin thin QFN package (5mm × 5mm, 0.8mm max thickness). The board populates all critical external components specified in the MAX1889 datasheet-including inductors, capacitors, diodes, pass transistors (Q1/Q2), and the input protection P-channel MOSFET (P1)-to fully realize the reference design.

Can the MAX1889EVKIT be used to test different output voltage configurations?

Yes. The MAX1889EVKIT supports reconfiguration of VMAIN, VPL, and VNL output voltages by modifying feedback resistors (R1–R10, R12–R14 per Figure 1), adjusting charge-pump stage count, and selecting appropriate external pass transistors. Its layout provides test points and jumper options to validate alternative configurations up to +13V (VMAIN), >+30V (VPL), and <–15V (VNL) as described in the MAX1889 datasheet.

How does the MAX1889EVKIT demonstrate fault protection features?

The MAX1889EVKIT validates all three layers of MAX1889 fault protection: (1) input overcurrent latching via OCP/OCN comparators and GATE-driven P-MOSFET disconnect, (2) thermal shutdown at +160°C (observable via thermal pad temperature rise), and (3) individual rail fault detection with 64ms timer latch. Test procedures are documented in the MAX1889EVKIT user guide, including forced overload and thermal stress scenarios.

Is the MAX1889EVKIT compatible with other Maxim display power ICs?

No-the MAX1889EVKIT is purpose-built for the MAX1889 and not pin-compatible or functionally interchangeable with other Maxim display power ICs such as the MAX1710 or MAX1711. Its component selection, layout, and firmware-free operation are optimized exclusively for the MAX1889's architecture, including its DRVP/DRVN linear-controller interface, FREQ-selectable oscillator, and triple-rail fault monitoring scheme.