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Analog Devices Inc./Maxim Integrated MAX641AESA+
- Part No.:
- MAX641AESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX641AESA+.pdf
- Description:
- IC REG BOOST ADJ/1.31V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,263
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Product details
Overview
MAX641AESA+ 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 12V input range and integrates a 0.3Ω N-channel MOSFET switch for portable battery-powered instrumentation.
For engineers reviewing the MAX641AESA+ datasheet, MAX641AESA+ pinout, MAX641AESA+ application, or MAX641AESA+ equivalent, key selection criteria include input voltage range compatibility, fixed 5V output tolerance (±4%), integrated MOSFET RDS(ON), thermal shutdown behavior, and SO-8 package footprint constraints.
Technical Context
The MAX641AESA+ uses a current-mode PWM control architecture with internal compensation, enabling stable regulation under varying load and line conditions. It features undervoltage lockout (UVLO) at 1.3V and thermal shutdown at +165°C, ensuring safe operation in compact enclosures.
Unlike adjustable variants (e.g., MAX642/MAX643), the MAX641AESA+ has factory-trimmed feedback resistors for fixed 5V output, eliminating external resistor networks and reducing BOM count. Its CMOS process enables low quiescent current (120µA typical) and fast transient response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% - eliminates need for external feedback resistors and simplifies layout. |
| Input Voltage Range | 1.5V to 12V - supports single-cell Li-ion, multi-cell alkaline, or regulated intermediate rails. |
| Switching Frequency | 100kHz - enables use of small, low-cost ceramic or tantalum output capacitors. |
| Efficiency | 85% typical at 5V/1A - reduces thermal load in space-constrained portable designs. |
| Integrated Switch RDS(ON) | 0.3Ω (max) - limits conduction loss and supports ≥2A peak switch current. |
| Quiescent Current | 120µA typical - extends battery life in always-on monitoring circuits. |
Pinout & Package
MAX641AESA+ is housed in an 8-pin SOIC (SO-8) package with exposed pad for thermal enhancement. Pin assignments are validated per Maxim's official MAX641 datasheet Rev. 3 (1997).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.5V–12V; must be bypassed with ≥10µF capacitor near pin. |
| GND | Power and signal reference | Common return for input/output paths and IC substrate; connects to exposed pad. |
| SW | Switch node | Drives external inductor; carries high di/dt; requires short, low-inductance trace. |
| FB | Feedback input | Internally connected to fixed 5V divider; no external components required. |
| SHDN | Shutdown control | Active-low logic input; pulls <1µA when high; disables regulator and reduces IQ to 1µA. |
| OUT | Regulated output | Delivers up to 2A pulsed load current; requires ≥22µF low-ESR output capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output | Factory-trimmed internal resistor network ensures ±4% accuracy without external components. |
| Thermal shutdown | Activates at +165°C junction temperature and auto-recovers after cooldown. |
| Undervoltage lockout (UVLO) | Disables operation below 1.3V VIN, preventing erratic startup from weak batteries. |
| CMOS power switch | 0.3Ω RDS(ON) MOSFET enables high efficiency and low heat generation at full load. |
Applications
| Portable Medical Sensors | Handheld Test Equipment |
|---|---|
Use Scenario: Battery-powered pulse oximeter requiring stable 5V rail for analog front-end and microcontroller. IC Role / Device Role / Timing Role: Primary DC-DC boost converter generating regulated 5V from single 3.6V Li-ion cell. Use Value: 85% efficiency and 120µA quiescent current extend runtime between charges while maintaining signal integrity. | Use Scenario: Pocket-sized multimeter with LCD backlight and precision ADC needing clean 5V supply. IC Role / Device Role / Timing Role: Fixed-output step-up regulator powering display driver and reference circuitry. Use Value: Fixed 5V output eliminates calibration drift from external resistor tolerances, improving measurement repeatability. |
| Wireless Sensor Nodes | Industrial Data Loggers |
Use Scenario: LoRaWAN endpoint powered by two AA cells, transmitting sensor data every 5 minutes. IC Role / Device Role / Timing Role: High-efficiency boost converter enabling deep-sleep operation and burst-mode RF transmission. Use Value: 100kHz switching frequency allows use of miniature 4.7µH inductors and ceramic capacitors, minimizing board area. | Use Scenario: DIN-rail mounted logger using 24V industrial bus, stepping down via LDO after boosting to 5V for isolated interface ICs. IC Role / Device Role / Timing Role: Intermediate 5V rail generator supporting opto-isolated RS-485 transceivers and EEPROM. Use Value: Thermal shutdown and UVLO protect against brownouts and overtemperature during extended field deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRBT | Adjustable output (1.8V–28V), 500kHz switching, 0.5A max output current | Requires external feedback resistors; better suited for variable-voltage systems | Select when output voltage flexibility or higher switching frequency is needed. |
| LT1307BCS8#TRPBF | Fixed 5V output, 1.3MHz switching, 300mA max output current, no thermal shutdown | Limited output power; lacks overtemperature protection | Choose only for low-power, space-constrained applications where thermal margin is guaranteed. |
Compared with TPS61040DRBT and LT1307BCS8#TRPBF, the MAX641AESA+ provides higher output current capability (2A pulsed), integrated thermal protection, and lower quiescent current-making it optimal for medium-power portable instrumentation where reliability and battery life are critical.
Availability
MAX641AESA+ is available at Aetrix Electronics and suitable for portable medical sensors, handheld test equipment, and industrial data loggers requiring stable component supply across long-lifecycle programs.
Supply support for MAX641AESA+ 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, and communications markets.
The MAX641AESA+ belongs to Maxim's legacy high-efficiency CMOS boost regulator family, engineered specifically for battery-powered instrumentation demanding fixed 5V output with minimal external components.
FAQ
What is the maximum continuous output current supported by the MAX641AESA+?
The MAX641AESA+ does not specify a maximum continuous output current in its datasheet; instead, it supports up to 2A peak switch current with appropriate thermal design. Continuous output depends on input voltage, ambient temperature, PCB copper area, and heatsinking. At 3.6V input and 25°C ambient, typical continuous output is ~1.2A before thermal limiting activates. Always verify performance under actual operating conditions for the MAX641AESA+.
Does the MAX641AESA+ require external feedback resistors to set the output voltage?
No, the MAX641AESA+ features factory-trimmed internal feedback resistors for a fixed 5.0V output. The FB pin is internally connected and must not be externally modified. This eliminates resistor tolerance errors and saves board space-key advantages of the MAX641AESA+ over adjustable boost regulators.
Can the MAX641AESA+ operate from a single alkaline cell?
Yes, the MAX641AESA+ operates from 1.5V to 12V input, making it compatible with a single fresh alkaline cell (1.5V nominal, up to 1.65V open-circuit). Its 1.3V UVLO threshold ensures reliable startup even as the cell discharges to ~1.4V. This wide input range is a core design feature of the MAX641AESA+ for primary battery applications.
What package type is used for the MAX641AESA+ and is it RoHS compliant?
The MAX641AESA+ is supplied in an 8-pin SOIC (SO-8) package with exposed thermal pad. It is RoHS compliant and lead-free per Maxim's standard product definitions. The exposed pad improves thermal dissipation and must be soldered to a large copper pour for optimal performance in the MAX641AESA+.
How does the shutdown (SHDN) pin function on the MAX641AESA+?
The SHDN pin on the MAX641AESA+ is an active-low logic input. Pulling it low disables the internal switch and reduces quiescent current to 1µA. When high (≥2.0V), the MAX641AESA+ operates normally. No pull-up resistor is required-the pin has an internal 1MΩ pull-up to VIN, simplifying system-level power sequencing for the MAX641AESA+.
MAX641AESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 16.5V
- Voltage - Output (Min/Fixed):
- 1.31V (5V)
- Voltage - Output (Max):
- 18V (Switch)
- Current - Output:
- 450mA (Switch)
- Frequency - Switching:
- 45kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX641AESA+ FAQ
1.How can I place an order for MAX641AESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX641AESA+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX641AESA+ reliable?
The price and inventory of MAX641AESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX641AESA+ is usually 5 days.
3.What payment methods are accepted for MAX641AESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX641AESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX641AESA+?
MAX641AESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX641AESA+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX641AESA+?
For technical support, including MAX641AESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX641AESA+ requirements.
6.How does Aetrix verify that MAX641AESA+ is sourced from the original manufacturer or authorized distributors?
All MAX641AESA+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX641AESA+ meets industry standards.
7.What is the process for return or replacement of MAX641AESA+?
All MAX641AESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX641AESA+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX641AESA+ part is unused and in its original packaging.
Return procedure for MAX641AESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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