Analog Devices Inc./Maxim Integrated MAX8969EWL50+T

Overview

MAX8969EWL50+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 regulated 5.0V output. It delivers up to 1A continuous output current at V_OUT = 5.0V with VIN ≥ 2.5V, features True Shutdown™ (1µA), automatic track mode (65µA), and integrated short-circuit/overtemperature/UVLO protection. It powers core rails in smartphones and GPS devices where input voltage straddles the output setpoint.

For engineers reviewing the MAX8969EWL50+T datasheet, MAX8969EWL50+T pinout, MAX8969EWL50+T application, or MAX8969EWL50+T equivalent, key selection criteria include its 5.0V fixed output, 3.0–5.5V input compatibility with automatic track transition at VIN ≈ 4.74V, 9-bump WLP footprint, and dual-mode efficiency optimization (skip mode at light load, ATM for near-V_OUT operation).

Technical Context

The MAX8969EWL50+T uses a fixed-frequency PWM architecture with adaptive frequency scaling: switching drops from 3MHz to ~1.6MHz when VIN exceeds 83% of V_OUT, then to ~1MHz if VIN > V_OUT – 460mV. Its control scheme combines load/line regulation to suppress overshoot during load removal while allowing controlled sag under transient load.

Three operational states are managed via EN and TREN pins: True Shutdown (EN=0, TREN=0; IQ=1µA), Track Mode (EN=0, TREN=1; pMOS current-limited switch, IQ=30µA), and Automatic Track Mode (EN=1, VIN > 4.74V; IQ=65µA). Boost mode activates when EN=1 and VIN falls below 4.74V, engaging both pMOS and nMOS switches with 2.6A peak LX current limit.

Key Specifications

Pinout & Package

MAX8969EWL50+T is housed in a 1.25mm × 1.25mm, 9-bump WLP (wafer-level package) with 0.4mm pitch. Bump layout is bottom-side down; solder bumps align directly to PCB pads. Thermal performance relies on GND1/GND2 connection to large copper pour and multiple vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS610995YFFR and RT9086AGQW, the MAX8969EWL50+T uniquely combines fixed 5.0V accuracy, automatic track mode for dynamic input-voltage adaptation, True Shutdown for robust power sequencing, and ultra-small WLP footprint-making it optimal for space-constrained, battery-sensitive handheld designs.

Availability

MAX8969EWL50+T is available at Aetrix Electronics and suitable for smartphone core rail, GPS receiver power, eBook display backlight, mobile internet device USB OTG, and portable medical sensor applications requiring stable component supply and RoHS-compliant packaging.

Supply support for MAX8969EWL50+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 systems.

The MAX8969 product line delivers highly integrated, ultra-compact DC-DC boost converters optimized for single-cell Li-ion battery-powered handheld devices where efficiency, size, and intelligent mode transitions are critical.

FAQ

What output voltage does the MAX8969EWL50+T deliver?

The MAX8969EWL50+T is factory-configured for a fixed 5.0V output with ±2.5% accuracy over temperature and load. It does not support adjustable output; variants like MAX8969EWL33+ or MAX8969EWL55+ provide other fixed voltages. The 5.0V setting is confirmed in the Ordering Information table and Electrical Characteristics section for V_{OUT_TARGET} = 5.0V.

How does the MAX8969EWL50+T handle input voltages close to 5.0V?

The MAX8969EWL50+T enters Automatic Track Mode (ATM) when VIN exceeds 4.74V (95% of 5.0V), turning on the pMOS as a current-limited pass switch instead of boosting. This reduces quiescent current to 65µA and eliminates switching losses. ATM exits automatically when VIN falls below 4.69V, seamlessly transitioning back to boost mode.

What protection features are integrated into the MAX8969EWL50+T?

The MAX8969EWL50+T integrates undervoltage lockout (2.2V typical), overtemperature shutdown (+165°C), short-circuit protection (2.6A peak LX current limit), and True Shutdown™ to block reverse current from LX_ to OUT_. These functions operate across all modes - Track, ATM, and Boost - ensuring robustness during fault conditions.

Can the MAX8969EWL50+T deliver 1A continuously at 5.0V output?

The MAX8969EWL50+T supports 1A peak output current, but the datasheet specifies a minimum continuous output current of 500mA at V_OUT = 5.0V under worst-case conditions (elevated temperature, component variation). Sustained 1A loads may trigger thermal shutdown; actual continuous capability depends on PCB layout, ambient temperature, and thermal management.

What is the recommended external component set for the MAX8969EWL50+T?

The MAX8969EWL50+T requires a 1µH shielded inductor (e.g., TOKO DFE252012), 4.7µF X5R/X7R input capacitor, and 22µF X5R/X7R output capacitor. The datasheet specifies these values for stable operation, low ripple (<20mV_P-P), and proper soft-start behavior. Layout guidelines emphasize placing C_OUT directly adjacent to OUT1/OUT2 bumps.