Analog Devices Inc./Maxim Integrated MAX8969EWL35+T

Overview

MAX8969EWL35+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 3.5V output. It delivers up to 1A continuous output current at V_OUT = 3.5V with ≥90% efficiency, features True Shutdown™ (1µA), and supports automatic track mode (65µA) and skip mode (45µA) for battery-powered handheld devices.

For engineers reviewing the MAX8969EWL35+T datasheet, MAX8969EWL35+T pinout, MAX8969EWL35+T application, or MAX8969EWL35+T equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (Boost/ATM/Track/True Shutdown), exact quiescent current values per mode, and real-world load transient behavior under 3.5V output conditions.

Technical Context

The MAX8969EWL35+T implements a fixed-frequency PWM architecture with automatic frequency adjustment (3MHz → 1.6MHz → 1MHz) when input voltage exceeds 83% of V_{OUT_TARGET}, enabling stable regulation across VIN = 2.5V–5.5V while maintaining duty cycle control. Its dual-MOSFET topology uses an internal p-channel switch (115mΩ at 3.5V) and n-channel switch (63mΩ) with synchronous rectification.

Three distinct operational states are controlled by EN and TREN inputs: True Shutdown (EN=0, TREN=0; IQ=1µA), Track Mode (EN=0, TREN=1; IQ=30µA; pMOS current-limited), and Automatic Track Mode (EN=1, TREN=X; IQ=65µA; transitions at VIN = 3.35V for V_OUT=3.5V). Soft-start limits inrush current to 480mA, and thermal shutdown activates at +165°C with 20°C hysteresis.

Key Specifications

Pinout & Package

MAX8969EWL35+T uses a 9-bump wafer-level package (WLP) measuring 1.25mm × 1.25mm with 0.4mm pitch. Bump-side-down top view places all terminals in a 3×3 grid. OUT1/OUT2 and LX1/LX2 must be shorted directly under the IC; GND1/GND2 require low-inductance connection to a large ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX8969EWL35+T, TPS610995YFFR offers lower quiescent current (300nA shutdown) but cannot deliver 3.5V at 0.8A; RT9080-35GJ6 matches the 3.5V output but lacks ATM's seamless VIN-following behavior and thermal robustness (no overtemperature hysteresis spec).

Availability

MAX8969EWL35+T is available at Aetrix Electronics and suitable for smartphone main power rails, eBook display backlight drivers, GPS/PND RF front-end supplies, and mobile internet device USB OTG ports requiring stable component supply with RoHS-compliant packaging and guaranteed -40°C to +85°C operation.

Supply support for MAX8969EWL35+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) designs precision analog, mixed-signal, and power management ICs for demanding portable, industrial, and communications applications.

The MAX8969 product line delivers ultra-compact, high-efficiency step-up converters for space-constrained handheld devices, emphasizing battery life extension through adaptive modes (ATM, skip), integrated protection, and minimal external component count.

FAQ

What output voltage does the MAX8969EWL35+T regulate to?

The MAX8969EWL35+T is factory-trimmed to deliver a fixed 3.5V output with ±2.5% accuracy at no load (3.40V–3.60V). Under load, output remains within ±0.35V of 3.5V for currents up to 600mA, as specified in the electrical characteristics table for V_{OUT_TARGET} = 3.5V. This fixed output eliminates need for external feedback resistors.

How does the MAX8969EWL35+T enter Automatic Track Mode (ATM)?

The MAX8969EWL35+T enters ATM when EN is logic-high and VIN rises to or exceeds 3.35V - the 95% threshold of its 3.5V output target. In ATM, the p-channel MOSFET operates as a current-limited linear pass element, allowing V_OUT to closely follow VIN while drawing only 65µA quiescent current. The transition occurs within 1µs.

What is the maximum continuous output current for the MAX8969EWL35+T at 3.5V?

The MAX8969EWL35+T guarantees 0.8A continuous output current at V_OUT = 3.5V across the full -40°C to +85°C temperature range, as documented in the Electrical Characteristics table. This value reflects derating for thermal performance; peak current capability remains 1A for short pulses (<100ms).

Does the MAX8969EWL35+T support true shutdown with reverse current blocking?

Yes, the MAX8969EWL35+T implements True Shutdown™, a proprietary feature that actively reverses the internal p-channel MOSFET body diode to block reverse current flow from LX_ to OUT_. In True Shutdown (EN=0, TREN=0), supply current drops to 1µA typical and OUT_ can safely discharge to 0V without backfeeding the input.

What external components are required for basic operation of the MAX8969EWL35+T?

The MAX8969EWL35+T requires only three external components for functional operation: a 1µH shielded inductor between LX_ and IN, a 4.7µF X5R/X7R ceramic input capacitor (C_IN) from IN to GND_, and a 22µF X5R/X7R ceramic output capacitor (C_OUT) from OUT_ to GND_. All capacitors must be placed adjacent to the IC per layout guidelines.