Analog Devices Inc./Maxim Integrated MAX8969EWL42+T

Overview

MAX8969EWL42+T from Maxim Integrated is a 1A, 3MHz synchronous step-up DC-DC converter in a 1.25mm × 1.25mm WLP package, designed for single-cell Li-ion systems requiring 4.25V output. It delivers up to 1A peak current with 90%+ efficiency, features True Shutdown™ (1µA), and supports Automatic Track Mode (ATM) for seamless VIN-to-VOUT transition when input exceeds 95% of 4.25V target - ideal for GPS/PND power rails.

For engineers reviewing the MAX8969EWL42+T datasheet, MAX8969EWL42+T pinout, MAX8969EWL42+T application, or MAX8969EWL42+T equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (Boost/ATM/Track/True Shutdown), real-world efficiency curves at VOUT = 4.25V, and two field-tested alternative parts with documented functional trade-offs.

Technical Context

The MAX8969EWL42+T uses a fixed-frequency PWM architecture with automatic frequency adjustment: switching drops from 3MHz to ~1.6MHz when VIN > 83% of 4.25V, then to ~1MHz when VIN > VOUT − 460mV. Its control logic implements load/line regulation to suppress overshoot during load removal while allowing controlled sag under heavy load.

Three distinct operational states are hardware-defined by EN and TREN inputs: True Shutdown (EN=0, TREN=0; IQ=1µA), Track Mode (EN=0, TREN=1; pMOS current-limited switch, IQ=30µA), and ATM (EN=1, VIN > 4.04V; pMOS active, IQ=65µA). Boost mode activates when EN=1 and VIN < 4.04V, engaging both pMOS and nMOS switches with 2.6A current limiting on LX_.

Key Specifications

Pinout & Package

MAX8969EWL42+T is housed in a 1.25mm × 1.25mm, 9-bump Wafer-Level Package (WLP) with 0.4mm pitch. The bump-side-down top view places all terminals in a 3×3 grid (A1–C3).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-up converter applications.

Compared with MAX8969EWL42+T, TPS610992DSER offers lower cost but sacrifices ATM functionality and current capability, while RT9086AGQW provides design flexibility at the expense of added components and absence of hardware-managed track modes.

Availability

MAX8969EWL42+T is available at Aetrix Electronics and suitable for GPS navigation devices, smartphone baseband subsystems, and mobile internet device USB OTG power management requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.

Supply support for MAX8969EWL42+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for portable, industrial, and communications applications.

The MAX8969 product line delivers ultra-compact, high-efficiency step-up converters for handheld devices with integrated protection and intelligent mode management - specifically engineered for single-cell Li-ion systems where board space, battery life, and seamless voltage transition are critical.

FAQ

What output voltage does the MAX8969EWL42+T regulate to, and how accurate is it?

The MAX8969EWL42+T is factory-trimmed to deliver a fixed 4.25V output. At no load, its accuracy is ±2.5% (3.95V to 4.35V). Under load (0–600mA), steady-state output remains within 3.95V–4.35V when using the recommended 22µF X5R/X7R ceramic output capacitor and 1µH inductor. This specification is guaranteed over −40°C to +85°C ambient temperature.

How does the MAX8969EWL42+T enter and exit Automatic Track Mode (ATM)?

The MAX8969EWL42+T enters ATM when EN is high and VIN rises above 4.04V (95% of 4.25V target), with a 50mV hysteresis. It exits ATM and re-enters Boost mode when VIN falls below 3.99V. Both transitions occur in ≤1µs. ATM is disabled if EN is low - in that case, TREN controls Track Mode or True Shutdown instead.

What is the maximum continuous output current the MAX8969EWL42+T can sustain at 4.25V?

The MAX8969EWL42+T supports 600mA continuous output current at VOUT = 4.25V, as specified in the Electrical Characteristics table under "Minimum Continuous Output Current" for that voltage setting. This value accounts for thermal limits, MOSFET RDS(ON), inductor DCR, and capacitor ESR across temperature. Peak current capability remains 1A for short pulses.

Does the MAX8969EWL42+T require external compensation components?

No, the MAX8969EWL42+T uses an internally compensated voltage-mode control loop. No external compensation network is needed - only the required input (4.7µF), output (22µF), and inductor (1µH) components must be placed per the Typical Operating Circuit. Stability is guaranteed with the specified passive component values and layout guidelines.

Can the MAX8969EWL42+T be used with input voltages above 4.25V, and what happens then?

Yes - the MAX8969EWL42+T accepts input voltages up to 5.5V. When VIN exceeds 4.04V, it automatically enters ATM mode, turning on the pMOS switch to pass input to output with minimal dropout (typical RDS(ON) = 100mΩ at 4.25V). In this mode, output closely follows input, reducing switching losses and improving efficiency compared to forced boost operation.