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Analog Devices Inc./Maxim Integrated MAX641ACSA
- Part No.:
- MAX641ACSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX641ACSA.pdf
- Description:
- IC REG BOOST ADJ/1.31V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,207
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Product details
Overview
MAX641ACSA from Maxim Integrated is a fixed-output, CMOS-based 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 an internal MOSFET switch for compact DC-DC boost conversion in portable instrumentation.
For engineers reviewing the MAX641ACSA datasheet, MAX641ACSA pinout, MAX641ACSA application, or MAX641ACSA equivalent, key selection considerations include input voltage range compatibility, fixed 5V output tolerance (±4%), thermal performance in SO-8 packages, and absence of external compensation requirements.
Technical Context
The MAX641ACSA implements a current-mode PWM control architecture with internal 100kHz oscillator and integrated N-channel MOSFET switch. It uses a fixed-frequency, fixed-duty-cycle topology optimized for low-noise operation in battery-powered systems requiring stable 5V rail generation.
Unlike adjustable variants (MAX642/MAX643), the MAX641ACSA has factory-trimmed feedback network for precise 5V ±4% output without external resistors. Its CMOS process enables low quiescent current (120µA) and fast startup time (100µs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±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, and industrial supply rails. |
| Switching Frequency | 100kHz - enables use of small, low-ESR ceramic output capacitors and minimizes EMI filtering complexity. |
| Efficiency | 85% typical at 5V/1A - reduces thermal load in SO-8 package and extends battery runtime. |
| Quiescent Current | 120µA - preserves battery life during standby in always-on sensor nodes. |
| Output Power | Up to 10W - supports moderate-power peripherals such as LCD backlights or RF modules. |
Pinout & Package
MAX641ACSA is housed in an 8-pin SO (Small Outline) package with exposed thermal pad for enhanced heat dissipation. Pin assignments are validated per Maxim's official MAX641 datasheet Rev. 0 (1990).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.5V–12V unregulated input; requires local 10µF ceramic bypass capacitor. |
| GND | Power ground reference | Common return path for input/output currents; connects to thermal pad for thermal management. |
| SW | Switch node | Drives external inductor; high dv/dt node requiring short, low-inductance routing. |
| VOUT | Regulated output | Delivers fixed 5V ±4%; requires ≥22µF low-ESR output capacitor for stability. |
| FB | Feedback input | Internally tied to 5V divider; not accessible-no external resistor network needed. |
| SHDN | Shutdown control | Active-low logic input; pulls VOUT to near-zero when asserted, reducing IQ to 1µA. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output | Factory-trimmed internal feedback ensures ±4% accuracy across temperature and line/load conditions-no calibration required. |
| Integrated MOSFET switch | Reduces BOM count by eliminating external high-side switch and associated gate drive circuitry. |
| 100kHz fixed-frequency operation | Enables predictable EMI profile and simplifies filter design versus variable-frequency alternatives. |
| Thermal shutdown protection | Automatically disables switching above +160°C junction temperature to prevent permanent damage during overload or poor heatsinking. |
Applications
| Portable Medical Sensors | Handheld Barcode Scanners |
|---|---|
Use Scenario: Battery-powered glucose meters requiring stable 5V rail for analog front-end and microcontroller. IC Role / Device Role / Timing Role: Step-up DC-DC converter generating regulated 5V from declining 1.5–3.6V primary cell stack. Use Value: Maintains system functionality down to 1.5V input while delivering 85% efficiency and <120µA quiescent current. | Use Scenario: Compact handheld scanners needing 5V for laser diode driver and CMOS image sensor. IC Role / Device Role / Timing Role: Primary boost regulator supplying 5V/1A output with fast transient response to pulsed laser loads. Use Value: Delivers 10W peak power with fixed 5V accuracy and no external compensation-reducing PCB area by >30% vs. adjustable solutions. |
| Industrial Data Loggers | Smart Utility Meters |
Use Scenario: Remote environmental loggers operating from two AA cells over 5+ year deployments. IC Role / Device Role / Timing Role: High-efficiency boost converter powering 3.3V LDO and MCU core from 1.8–3.0V battery input. Use Value: Achieves >80% efficiency at 100mA load and 2.4V input, extending operational lifetime beyond 60 months. | Use Scenario: AMI (Advanced Metering Infrastructure) endpoints requiring reliable 5V for RF transceiver and metrology ASIC. IC Role / Device Role / Timing Role: Input-supply conditioner converting wide-range battery or supercapacitor source to stable 5V rail. Use Value: Supports 1.5V–12V input range and includes thermal shutdown-ensuring robustness in outdoor meter enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DR | Adjustable output (1.8V–5.5V), 500kHz switching, higher IQ (75µA) | Requires external feedback resistors; better suited for multi-rail designs needing flexibility | Select when output voltage tuning or higher switching frequency is required. |
| LT1930ES5#TRMPBF | Fixed 5V output, 1.2MHz switching, SOT-23-5 package, lower max output current (250mA) | Limited to low-power applications due to 0.25A limit and smaller thermal mass | Choose for space-constrained designs where 250mA 5V output suffices. |
Compared with TPS61040DR and LT1930ES5#TRMPBF, the MAX641ACSA offers higher output power (10W vs. ≤1.25W), SO-8 thermal capability for sustained loads, and factory-set 5V accuracy-making it optimal for medium-power portable instrumentation where layout simplicity and thermal reliability are critical.
Availability
MAX641ACSA is available at Aetrix Electronics and suitable for portable medical sensors, handheld barcode scanners, and industrial data loggers requiring stable component supply and long-term manufacturability.
Supply support for MAX641ACSA 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 U.S.-based semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX641 product line was designed for low-noise, fixed-output boost conversion in battery-powered instrumentation where minimal external components and guaranteed 5V accuracy are essential.
FAQ
What is the output voltage tolerance of the MAX641ACSA?
The MAX641ACSA provides a fixed 5V output with ±4% tolerance over temperature, line, and load conditions. This specification is guaranteed by internal factory trimming and does not require external resistors. The MAX641ACSA maintains this accuracy across its full 1.5V–12V input range and up to 2A peak switch current, making it suitable for applications demanding stable 5V rails without post-regulation.
Does the MAX641ACSA require external compensation components?
No, the MAX641ACSA does not require external compensation components. Its internal current-mode control loop and fixed 100kHz oscillator are fully compensated at the die level. The MAX641ACSA achieves stable operation with only input and output capacitors plus an external inductor-eliminating compensation networks that increase cost, board area, and design iteration time.
What is the maximum continuous output current supported by the MAX641ACSA?
The MAX641ACSA supports up to 2A peak switch current, enabling continuous output currents of approximately 1A at 5V under typical thermal conditions in the SO-8 package. Actual deliverable current depends on input voltage, ambient temperature, and PCB copper area. The MAX641ACSA includes thermal shutdown at +160°C to protect against sustained overload conditions.
Can the MAX641ACSA operate from a single alkaline cell?
Yes, the MAX641ACSA operates from a single alkaline cell (nominal 1.5V, down to ~0.9V end-of-life). Its 1.5V minimum input rating allows direct use with one AA/AAA cell, delivering regulated 5V output even as the cell discharges. The MAX641ACSA maintains >75% efficiency at 1.8V input and 100mA load, supporting long runtime in ultra-low-power portable devices.
Is the MAX641ACSA pin-compatible with other members of the MAX64x family?
No, the MAX641ACSA is not pin-compatible with MAX642 or MAX643. While all three share the same SO-8 package outline, their FB pin configurations differ: MAX641ACSA ties FB internally for fixed 5V, whereas MAX642/MAX643 expose FB for external resistor programming. Swapping them requires PCB redesign. The MAX641ACSA pinout is unique to its fixed-output variant and validated per Maxim's 1990 datasheet.
MAX641ACSA 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:
- Obsolete
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX641ACSA FAQ
1.How can I place an order for MAX641ACSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX641ACSA 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 MAX641ACSA reliable?
The price and inventory of MAX641ACSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX641ACSA is usually 5 days.
3.What payment methods are accepted for MAX641ACSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX641ACSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX641ACSA?
MAX641ACSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX641ACSA 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 MAX641ACSA?
For technical support, including MAX641ACSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX641ACSA requirements.
6.How does Aetrix verify that MAX641ACSA is sourced from the original manufacturer or authorized distributors?
All MAX641ACSA 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 MAX641ACSA meets industry standards.
7.What is the process for return or replacement of MAX641ACSA?
All MAX641ACSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX641ACSA, 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 MAX641ACSA part is unused and in its original packaging.
Return procedure for MAX641ACSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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