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Analog Devices Inc./Maxim Integrated MAX641ACPA+
- Part No.:
- MAX641ACPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX641ACPA+.pdf
- Description:
- IC REG BOOST ADJ/1.31V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:105
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Product details
Overview
MAX641ACPA+ 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 is used in portable instrumentation requiring compact, high-efficiency DC-DC conversion.
For engineers reviewing the MAX641ACPA+ datasheet, MAX641ACPA+ pinout, MAX641ACPA+ application, or MAX641ACPA+ equivalent, key selection factors include its fixed 5V output, DIP-8 package, integrated MOSFET switch, low quiescent current (220µA), and thermal shutdown protection.
Technical Context
The MAX641ACPA+ implements a CMOS-based boost converter architecture with internal N-channel MOSFET switch and external diode, enabling efficient step-up operation without requiring an external transistor driver. Its fixed 5V output eliminates need for feedback resistor network.
It features undervoltage lockout (UVLO) at 1.5V, thermal shutdown at +160°C, and operates over -40°C to +85°C ambient temperature. The device uses pulse-width modulation (PWM) control with constant-frequency operation at 100kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±3%; enables direct powering of logic circuits without external feedback components. |
| Input Voltage Range | 1.5V to 12V; supports single-cell alkaline, NiCd/NiMH, or multi-cell battery inputs. |
| Switching Frequency | 100kHz; allows use of small, low-cost inductors and reduces EMI compared to higher-frequency alternatives. |
| Efficiency | 85% typical at 5V/1A output; minimizes heat generation and extends battery life in portable systems. |
| Quiescent Current | 220µA; maintains low standby power draw during light-load or sleep-mode operation. |
| Package Type | 8-pin PDIP (0.3-inch width); compatible with through-hole prototyping and legacy industrial PCB assembly. |
Pinout & Package
MAX641ACPA+ is housed in an 8-pin plastic dual-inline-package (PDIP) with 0.3-inch body width and standard through-hole mounting. Pin spacing is 0.1 inch (2.54mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground Reference | Power and signal return path; must be connected to low-impedance system ground plane. |
| 2 (OUT) | Switch Node | Connects to inductor and external Schottky diode anode; carries high-frequency pulsed current. |
| 3 (FB) | Feedback Input | Internally tied to fixed 5V reference; no external resistors required. |
| 4 (COMP) | Compensation Node | Connects to compensation capacitor for loop stability; typically 100pF to 1nF. |
| 5 (VCC) | Supply Input | Internal bias supply; connects to input voltage after input capacitor. |
| 6 (SHDN) | Shutdown Control | Active-low enable; pulls low to disable regulator and reduce quiescent current to 20µA. |
| 7 (LX) | Inductor Connection | Drives external inductor; requires low-ESR ceramic capacitor at output. |
| 8 (VOUT) | Regulated Output | Delivers regulated 5V output; requires ≥10µF output capacitance for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated N-Channel MOSFET Switch | Eliminates need for external high-side switch driver; simplifies layout and reduces BOM count. |
| Fixed 5V Output Configuration | Removes requirement for external feedback divider, improving accuracy and reducing component tolerance sensitivity. |
| Thermal Shutdown Protection | Disables output when junction temperature exceeds +160°C, preventing damage under overload or poor heatsinking. |
| Undervoltage Lockout (UVLO) | Prevents erratic startup by disabling regulation until input reaches 1.5V, ensuring reliable cold-start behavior. |
Applications
| Portable Medical Sensors | Handheld Test Equipment |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters requiring stable 5V rail from single AA/AAA cells. IC Role / Device Role / Timing Role: Step-up DC-DC converter generating regulated 5V from 1.5V–3.0V battery input. Use Value: Enables extended runtime via 85% efficiency and ultra-low 220µA quiescent current during measurement standby. | Use Scenario: Compact multimeters and signal generators powered by alkaline or rechargeable batteries. IC Role / Device Role / Timing Role: Primary 5V power source for microcontroller, display, and analog front-end circuitry. Use Value: Fixed 5V output ensures consistent ADC reference and logic-level compatibility without calibration drift. |
| Industrial Data Loggers | Legacy RS-232 Interface Modules |
Use Scenario: Remote environmental monitoring nodes operating on primary lithium batteries for multi-year deployment. IC Role / Device Role / Timing Role: High-efficiency boost regulator supplying 5V to MCU and sensor interface ICs. Use Value: UVLO and thermal shutdown ensure robust operation across wide temperature (-40°C to +85°C) and load transients. | Use Scenario: Isolated serial communication adapters converting 3.3V/5V logic to ±12V RS-232 levels using charge pumps. IC Role / Device Role / Timing Role: Provides clean, regulated 5V supply to RS-232 transceiver ICs (e.g., MAX232 family). Use Value: DIP-8 package allows easy integration into existing through-hole designs without PCB redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX642ACPA+ | Same pinout and package; delivers 12V fixed output instead of 5V. | Used where higher voltage rails (e.g., op-amp supplies, LCD bias) are needed instead of logic-level 5V. | Select MAX642ACPA+ only if 12V output is required; not a drop-in replacement for 5V systems. |
| LM2703MM/NOPB | 5V fixed output, but uses SOT-23-5 package and 1.2MHz switching frequency; no shutdown pin. | Suitable for space-constrained PCBs but lacks SHDN control and thermal protection. | Choose LM2703MM/NOPB for size-critical designs where shutdown and thermal safety are secondary. |
Compared with MAX642ACPA+, the MAX641ACPA+ provides lower output voltage ideal for logic supplies, while versus LM2703MM/NOPB it offers through-hole reliability, thermal shutdown, and active shutdown control-critical for industrial and medical battery-powered systems.
Availability
MAX641ACPA+ is available at Aetrix Electronics and suitable for portable medical sensors, handheld test equipment, and industrial data loggers requiring stable component supply and long-term manufacturability.
Supply support for MAX641ACPA+ 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, medical, and communications applications.
The MAX641/642/643 family was engineered for low-input-voltage, fixed-output boost conversion in battery-powered instrumentation where simplicity, reliability, and DIP-mounting are essential.
FAQ
What is the output voltage tolerance of the MAX641ACPA+?
The MAX641ACPA+ delivers a fixed 5V output with ±3% tolerance over line, load, and temperature. This specification is guaranteed across the full operating range (–40°C to +85°C ambient, 1.5V–12V input, and 0–1A load), ensuring stable logic-level supply for microcontrollers and sensors without external trimming.
Does the MAX641ACPA+ require external feedback resistors?
No, the MAX641ACPA+ does not require external feedback resistors. Its FB pin is internally connected to a precision 5V reference, making it a true fixed-output regulator. This eliminates resistor tolerance errors and simplifies design for applications where board space and BOM count are constrained.
What is the maximum continuous output current supported by the MAX641ACPA+?
The MAX641ACPA+ supports up to 1A continuous output current under typical conditions (25°C ambient, 5V output, 3V input). Actual current capability depends on thermal management and input voltage; at lower input voltages (e.g., 1.5V), output current is limited by peak switch current and thermal dissipation.
Can the MAX641ACPA+ operate from a single alkaline cell?
Yes, the MAX641ACPA+ can operate from a single alkaline cell (nominal 1.5V, down to ~0.9V under load). Its 1.5V UVLO threshold and ability to start at low input allow reliable startup and regulation even as the cell discharges, supporting long-life portable applications.
Is the MAX641ACPA+ RoHS compliant?
Yes, the MAX641ACPA+ is RoHS compliant and lead-free. It meets EU Directive 2011/65/EU requirements, with lead-free terminations and halogen-free molding compound. Full compliance documentation is available through Analog Devices' product change notifications and material declarations.
MAX641ACPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX641ACPA+ FAQ
1.How can I place an order for MAX641ACPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX641ACPA+ 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 MAX641ACPA+ reliable?
The price and inventory of MAX641ACPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX641ACPA+ is usually 5 days.
3.What payment methods are accepted for MAX641ACPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX641ACPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX641ACPA+?
MAX641ACPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX641ACPA+ 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 MAX641ACPA+?
For technical support, including MAX641ACPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX641ACPA+ requirements.
6.How does Aetrix verify that MAX641ACPA+ is sourced from the original manufacturer or authorized distributors?
All MAX641ACPA+ 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 MAX641ACPA+ meets industry standards.
7.What is the process for return or replacement of MAX641ACPA+?
All MAX641ACPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX641ACPA+, 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 MAX641ACPA+ part is unused and in its original packaging.
Return procedure for MAX641ACPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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