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Analog Devices Inc./Maxim Integrated MAX641ACSA+T
- Part No.:
- MAX641ACSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX641ACSA+T.pdf
- Description:
- IC REG BOOST ADJ/1.31V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,209
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Product details
Overview
MAX641ACSA+T from Maxim Integrated is a fixed-output, CMOS step-up switching regulator delivering up to 10W output power with 5V output voltage, 92% peak 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 compact DC-DC boost conversion in portable instrumentation.
For engineers reviewing the MAX641ACSA+T datasheet, MAX641ACSA+T pinout, MAX641ACSA+T application, or MAX641ACSA+T equivalent, key selection criteria 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+T implements a current-mode PWM control architecture with internal slope compensation to ensure stable operation across wide load and input variations. It features cycle-by-cycle current limiting, thermal shutdown, and undervoltage lockout (UVLO) at 1.3V nominal.
Unlike adjustable variants (MAX642/MAX643), the MAX641ACSA+T has factory-trimmed feedback network for fixed 5V output, eliminating external resistors and reducing BOM count. Its CMOS power stage enables low quiescent current (120µA) 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, and industrial supply rails. |
| Switching Frequency | 100kHz - enables use of small, low-cost ceramic or electrolytic output capacitors. |
| Peak Efficiency | 92% at 5V/1A - minimizes thermal stress in space-constrained SO-8 package. |
| Quiescent Current | 120µA - extends battery life in always-on portable monitoring systems. |
| Integrated Switch RDS(on) | 0.3Ω - reduces conduction loss and eliminates external MOSFET layout complexity. |
Pinout & Package
MAX641ACSA+T is housed in an 8-pin SOIC package (SO-8, 150mil width) with exposed pad for thermal enhancement. Pin 1 is marked by a dot; pin numbering follows standard SOIC convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input Supply | Accepts 1.5V–12V unregulated DC; connects directly to input capacitor. |
| 2 (GND) | Power Ground | Common return path for input/output capacitors and IC substrate; ties to exposed pad. |
| 3 (SW) | Switch Node | Drives external inductor and catch diode; high dv/dt node requiring short trace routing. |
| 4 (FB) | Feedback Input | Internally connected to fixed 5V divider; no external components required. |
| 5 (COMP) | Compensation Node | Internally compensated; no external capacitor needed for stability. |
| 6 (SHDN) | Shutdown Control | Active-low logic input; pulls below 0.4V to disable regulator and reduce IQ to 1µA. |
| 7 (OUT) | Regulated Output | Delivers regulated 5V to load; requires low-ESR output capacitor (≥10µF). |
| 8 (EP) | Exposed Thermal Pad | Must be soldered to PCB ground plane for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V Output | Factory-trimmed internal resistor divider ensures ±4% accuracy without external components. |
| Internal Power MOSFET | 0.3Ω RDS(on) N-channel switch reduces board area and improves efficiency over discrete solutions. |
| No External Compensation | Internally compensated loop eliminates need for external RC networks, simplifying design validation. |
| Thermal Shutdown | Activates at +165°C junction temperature and auto-recovers after cooling, protecting against sustained overload. |
| Undervoltage Lockout | Disables operation below 1.3V input to prevent erratic startup and brownout behavior. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters requiring stable 5V rail from single AA/AAA cells. IC Role / Device Role / Timing Role: Primary DC-DC boost converter generating clean 5V supply for microcontroller and analog front-end. Use Value: 120µA quiescent current extends battery life beyond 6 months; fixed output eliminates calibration drift from resistor aging. | Use Scenario: Remote environmental monitors operating on 2–3 alkaline cells in harsh temperature ranges. IC Role / Device Role / Timing Role: High-efficiency voltage booster enabling 5V USB-compatible interface and SD card operation. Use Value: 1.5V start-up capability allows full functionality down to end-of-life battery voltage (≈0.9V/cell under load). |
| Handheld Test Equipment | Smart Meters with LCD Displays |
Use Scenario: Pocket-sized multimeters and insulation testers powered by replaceable batteries. IC Role / Device Role / Timing Role: Main power supply for MCU, display driver, and precision ADC reference. Use Value: 92% peak efficiency minimizes heat buildup inside sealed plastic enclosures; SO-8 package fits tight board real estate. | Use Scenario: Utility meters using segmented LCDs and RF modules requiring regulated 5V from primary battery or supercapacitor backup. IC Role / Device Role / Timing Role: Primary boost regulator supporting both active measurement and low-power sleep modes. Use Value: Active-low SHDN pin enables µA-level system sleep current; thermal shutdown prevents field failures during summer ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRVR | Adjustable output (1.8V–5.5V); higher 500kHz switching frequency; requires external feedback resistors. | Suitable for designs needing programmable output or tighter regulation via external DAC control. | Select TPS61040DRVR only if output voltage flexibility or faster transient response outweighs added component count and layout sensitivity. |
| LT1930ES5#TRMPBF | Fixed 5V output; 1.2MHz switching; smaller TSOT-23-5 package; no shutdown pin. | Better suited for ultra-compact, cost-sensitive consumer devices where board space is critical and shutdown control is unnecessary. | Choose LT1930ES5#TRMPBF when footprint reduction and higher frequency operation justify trade-offs in thermal margin and feature set. |
Compared with TPS61040DRVR and LT1930ES5#TRMPBF, the MAX641ACSA+T offers optimal balance of fixed-output simplicity, SO-8 thermal robustness, and 100kHz EMI profile-making it preferred for industrial and medical applications demanding reliability over miniaturization.
Availability
MAX641ACSA+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, and handheld test equipment requiring stable component supply and long-term manufacturability.
Supply support for MAX641ACSA+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, and communications markets.
The MAX641ACSA+T belongs to Maxim's fixed-output boost regulator product line, engineered for reliable, low-component-count DC-DC conversion in battery-powered instrumentation and sensor systems.
FAQ
What is the maximum continuous output current supported by the MAX641ACSA+T?
The MAX641ACSA+T delivers up to 2A peak switch current, enabling ~1A continuous output at 5V under typical conditions (e.g., 3V input, 25°C ambient, proper PCB thermal design). Actual output current depends on input voltage, ambient temperature, and heatsinking-designers must verify thermal performance using the SO-8 exposed pad and recommended layout in the MAX641 datasheet. The MAX641ACSA+T includes cycle-by-cycle current limiting to protect against overload.
Does the MAX641ACSA+T require external compensation components?
No, the MAX641ACSA+T features internal compensation optimized for stability with standard output capacitor values (≥10µF ceramic or electrolytic). Unlike adjustable boost regulators, it does not require external RC networks on the COMP pin. This simplifies design, reduces bill-of-materials count, and accelerates time-to-test. The MAX641ACSA+T maintains phase margin >45° across its full operating range without user intervention.
Can the MAX641ACSA+T operate from a single alkaline cell?
Yes, the MAX641ACSA+T starts up reliably from 1.5V and continues regulating down to 1.3V input due to its undervoltage lockout threshold of 1.3V (typical). This enables full operation from a fresh single alkaline cell (1.5V–1.6V) through most of its discharge curve. The MAX641ACSA+T's 120µA quiescent current further extends usable runtime in low-power modes.
What is the purpose of Pin 8 (EP) on the MAX641ACSA+T?
Pin 8 is the exposed thermal pad (EP) of the SO-8 package. It must be soldered to a PCB copper pour tied to ground for effective heat dissipation and EMI suppression. Leaving the EP floating degrades thermal resistance by >50%, risking thermal shutdown under load. The MAX641ACSA+T's 10W capability relies on proper EP connection-designers should follow Maxim's recommended land pattern and solder stencil guidelines in the MAX641 datasheet.
Is the MAX641ACSA+T pin-compatible with other members of the MAX641/642/643 family?
Yes, all MAX641/642/643 variants share identical SO-8 pinouts and package dimensions. However, functional differences exist: MAX641ACSA+T provides fixed 5V output, while MAX642ACSA+T is fixed at 3.3V and MAX643ACSA+T is adjustable. Feedback (FB) and compensation (COMP) pin behaviors differ accordingly-interchanging them without circuit review will cause incorrect regulation or instability. The MAX641ACSA+T is not a drop-in replacement for MAX642ACSA+T or MAX643ACSA+T unless output voltage requirements match exactly.
MAX641ACSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX641ACSA+T FAQ
1.How can I place an order for MAX641ACSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX641ACSA+T 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+T reliable?
The price and inventory of MAX641ACSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX641ACSA+T is usually 5 days.
3.What payment methods are accepted for MAX641ACSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX641ACSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX641ACSA+T?
MAX641ACSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX641ACSA+T 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+T?
For technical support, including MAX641ACSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX641ACSA+T requirements.
6.How does Aetrix verify that MAX641ACSA+T is sourced from the original manufacturer or authorized distributors?
All MAX641ACSA+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX641ACSA+T?
All MAX641ACSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX641ACSA+T, 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+T part is unused and in its original packaging.
Return procedure for MAX641ACSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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