Analog Devices Inc./Maxim Integrated MAX8648ETE+GA8

Overview

MAX8648ETE+GA8 from Maxim Integrated is a six-channel white/RGB LED driver IC with serial-pulse dimming control, inverting charge pump architecture, and adaptive current regulators delivering 0.1–24mA per channel with ±2% accuracy and ±0.4% matching (typ). It operates from 2.7V to 5.5V input, achieves >90% efficiency across Li+ battery range, and integrates thermal shutdown, open/short-circuit protection, and temperature derating for display backlighting in smartphones and portable devices.

For engineers reviewing the MAX8648ETE+GA8 datasheet, MAX8648ETE+GA8 pinout, MAX8648ETE+GA8 application, or MAX8648ETE+GA8 equivalent, key selection criteria include its 16-pin 3mm×3mm thin QFN package, serial-pulse interface timing (tHI ≥1µs, tLO = 1–500µs), 1MHz fixed-frequency switching, 70µA quiescent current, and thermal derating activation at +60°C.

Technical Context

The MAX8648ETE+GA8 employs an inverting charge pump generating up to 5V below VIN on the NEG pin, enabling efficient LED driving even with large forward-voltage mismatch. Its six independent current regulators switch return path between GND and NEG on a per-LED basis-only activating the charge pump where required-to minimize power loss.

Dimming is implemented via three enable inputs (ENA, ENB, ENC) accepting logic pulses: each low pulse (1–500µs width) steps current down pseudo-logarithmically across 32 levels (24mA → 0.1mA), with automatic wraparound to full scale after minimum current. Thermal derating reduces output by −2.5%/°C above +60°C to protect LEDs.

Key Specifications

Pinout & Package

MAX8648ETE+GA8 is housed in a 16-pin, 3mm × 3mm thin QFN package with exposed paddle (EP), 0.8mm max height, and lead-free finish. The EP must be connected to NEG for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED driver applications.

Compared with MAX8647ETE+, the MAX8648ETE+GA8 trades I²C flexibility for simpler GPIO-based dimming and smaller software footprint; versus TPS61165DRVR, it provides six matched channels, thermal protection, and true independent control-making it uniquely suitable for dual-display or RGB backlight systems demanding reliability and uniformity.

Availability

MAX8648ETE+GA8 is available at Aetrix Electronics and suitable for smartphone display backlighting, portable media player indicators, and wearable RGB fun light systems requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.

Supply support for MAX8648ETE+GA8 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 portable, industrial, and communications applications.

The MAX8647/MAX8648 product line was designed specifically for ultra-efficient, space-constrained LED backlighting in battery-powered consumer electronics-emphasizing minimal external components, thermal resilience, and flexible dimming interfaces.

FAQ

What interface does the MAX8648ETE+GA8 use for LED dimming control?

The MAX8648ETE+GA8 uses a three-wire serial-pulse logic interface with ENA, ENB, and ENC inputs. Each low-going pulse (1–500µs width) decrements LED current in 32 pseudo-logarithmic steps from 24mA down to 0.1mA. No clock or data lines are required-only simple GPIO toggling. This differs from the I²C interface used by the MAX8647ETE+, making MAX8648ETE+GA8 ideal for resource-constrained microcontrollers.

How does the MAX8648ETE+GA8 handle LED forward-voltage mismatch?

The MAX8648ETE+GA8 dynamically switches individual LED current regulators between GND and NEG return paths. When VIN exceeds an LED's forward voltage plus 150mV headroom, that regulator uses GND; otherwise, it routes current to NEG-activated only where needed. This per-LED switchover maintains >90% efficiency even with large V_F mismatches across six LEDs, unlike fixed-architecture drivers that activate the charge pump globally.

What is the thermal derating behavior of the MAX8648ETE+GA8?

The MAX8648ETE+GA8 begins reducing LED current at +60°C at a rate of −2.5%/°C to protect connected LEDs from thermal stress. At +70°C, output drops to ~75% of full scale (18mA); at +85°C, it reaches ~37.5% (~9mA). This function operates automatically without host intervention and resets upon cooling-enabling safe use of 24mA full-scale settings during normal operation while preventing damage during sustained high-temperature exposure.

What protection features are integrated into the MAX8648ETE+GA8?

The MAX8648ETE+GA8 includes thermal shutdown (trip at +160°C, hysteresis 20°C), open-circuit and short-circuit LED detection at power-up, inrush current limiting, and internal 10kΩ pull-down on NEG and C2N during shutdown. These features prevent battery drain, overheating, and voltage transients-critical for unattended portable devices. Unlike basic drivers, MAX8648ETE+GA8 disables faulty regulators rather than continuing regulation into fault conditions.

What are the key layout requirements for the MAX8648ETE+GA8?

Place all four 1µF ceramic capacitors (C1P/C1N, C2P/C2N) as close as possible to their respective pins; use solid copper ground plane beneath the IC; connect the exposed paddle (EP) directly to NEG via multiple thermal vias; keep IN and NEG traces wide and short; avoid routing sensitive analog traces near switching nodes. These practices minimize EMI, reduce input ripple (<16mV RMS typical), and ensure stable 1MHz charge pump operation-verified in the MAX8648 evaluation kit layout (Figure 4).