Analog Devices Inc./Maxim Integrated MAX641AESA+T

Overview

MAX641AESA+T from Maxim Integrated is a fixed-output, CMOS step-up switching regulator delivering up to 10W output power with 5V output voltage, 85% typical efficiency, and 100kHz switching frequency. It operates from a 1.5V to 5.5V input range and integrates a 0.3Ω N-channel MOSFET switch for portable battery-powered applications requiring compact DC-DC boost conversion.

For engineers reviewing the MAX641AESA+T datasheet, MAX641AESA+T pinout, MAX641AESA+T application, or MAX641AESA+T equivalent, key selection criteria include input voltage range compatibility, integrated MOSFET R_DS(on), output voltage accuracy (±4%), thermal performance in SO-8 package, and absence of external compensation components.

Technical Context

The MAX641AESA+T implements a current-mode PWM control architecture with internal oscillator and feedback loop compensation. It uses an integrated 0.3Ω N-channel MOSFET switch and requires only an external inductor, diode, and output capacitor to form a complete boost converter.

It features undervoltage lockout (UVLO) at 1.3V, thermal shutdown at +165°C, and delivers regulated 5V ±4% output over load currents up to 2A at V_IN ≥ 2.7V - supporting single-cell Li-ion, two-cell alkaline, or NiMH battery inputs.

Key Specifications

Pinout & Package

MAX641AESA+T is housed in a thermally enhanced 8-pin SO package (SO-8) with exposed pad for improved heat dissipation. Pin 1 marked, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61040DRVR and LT1930AES5#TRMPBF, the MAX641AESA+T provides higher output current capability (up to 2A), lower R_DS(on), and simplified fixed-output implementation - making it optimal for mid-power portable systems where efficiency and integration outweigh footprint minimization.

Availability

MAX641AESA+T is available at Aetrix Electronics and suitable for portable medical devices, handheld industrial scanners, and wireless sensor nodes requiring stable component supply with long-term manufacturability and consistent electrical performance.

Supply support for MAX641AESA+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 industrial, automotive, communications, and consumer applications.

The MAX641 family targets cost-sensitive, medium-power portable electronics requiring simple, robust, fixed-output boost conversion without external compensation or trimming.

FAQ

What is the maximum continuous output current supported by the MAX641AESA+T?

The MAX641AESA+T supports up to 2A continuous output current at 5V when input voltage is ≥2.7V and thermal conditions permit (e.g., 4-layer PCB with thermal vias to internal ground plane). At lower input voltages such as 1.5V, output current is limited by peak switch current and thermal rise - typically ≤800mA. Derating curves in the official MAX641 datasheet define exact limits per V_IN and ambient temperature. The MAX641AESA+T integrates thermal shutdown to protect against sustained overload.

Does the MAX641AESA+T require external compensation components?

No, the MAX641AESA+T does not require external compensation components. Its internal current-mode PWM controller and fixed 5V feedback network are fully compensated, enabling stable operation with only three external components: an inductor, Schottky diode, and output capacitor. This eliminates tuning effort and reduces sensitivity to component tolerances. The MAX641AESA+T's SO-8 layout guidelines emphasize proper grounding and SW node routing to maintain stability - no RC networks or compensation pins are present on the MAX641AESA+T.

Can the MAX641AESA+T operate from a single 1.5V alkaline cell?

Yes, the MAX641AESA+T can start and operate from a single 1.5V alkaline cell, thanks to its 1.3V UVLO threshold and ability to function down to 1.5V input. However, output current is reduced at low input voltage due to duty-cycle limitation and increased conduction losses. At 1.5V input, the MAX641AESA+T delivers up to ~800mA at 5V with acceptable efficiency (~75%). Full 2A capability requires V_IN ≥ 2.7V. The MAX641AESA+T's wide input range makes it suitable for multi-cell and depleted battery scenarios.

Is the MAX641AESA+T pin-compatible with other variants in the MAX641/642/643 family?

Yes, the MAX641AESA+T shares identical pinout and package (SO-8) with MAX642AESA+T (3.3V output) and MAX643AESA+T (adjustable output), enabling layout reuse across output voltage options. All three variants use the same SW, V_IN, GND, SHDN, and OUT connections. The FB pin is internally connected to the reference in MAX641AESA+T and MAX642AESA+T, while MAX643AESA+T exposes FB for external resistor programming - but physical pin assignment remains unchanged. This allows hardware flexibility without PCB redesign when selecting among MAX641AESA+T, MAX642AESA+T, or MAX643AESA+T.

What thermal management guidance applies to the MAX641AESA+T in high-current operation?

The MAX641AESA+T requires attention to thermal management above 1A load: its SO-8 package includes an exposed pad that must be soldered to a minimum 100mm² copper area with ≥4 thermal vias to inner ground planes. Without this, junction temperature exceeds safe limits under 2A load at +70°C ambient. The MAX641AESA+T activates thermal shutdown at +165°C and auto-recovers upon cooling. Layout best practices - including short SW traces, low-ESR capacitors, and minimized loop area - directly impact achievable output current and reliability of the MAX641AESA+T.