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Analog Devices Inc./Maxim Integrated MAX642AEPA+
- Part No.:
- MAX642AEPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX642AEPA+.pdf
- Description:
- IC REG BST ADJ/1.31V 450MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,119
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Product details
Overview
MAX642AEPA+ from Maxim Integrated is a fixed-output, 10W CMOS step-up switching regulator in 8-pin PDIP package, delivering 5V at up to 2A output current with 90% peak efficiency and 100kHz switching frequency. It operates from 1.5V to 12V input and integrates internal power MOSFET and diode for compact DC-DC boost conversion in battery-powered instrumentation.
For engineers reviewing the MAX642AEPA+ datasheet, MAX642AEPA+ pinout, MAX642AEPA+ application, or MAX642AEPA+ equivalent, key selection factors include its fixed 5V output, internal switch/diode integration, PDIP-8 thermal performance, and compatibility with single-cell alkaline/NiMH or dual-cell Li-ion input sources.
Technical Context
The MAX642AEPA+ implements a CMOS-based current-mode PWM controller with internal 0.2Ω N-channel MOSFET switch and integrated Schottky catch diode. Its fixed 5V output is set by internal resistor divider, eliminating external feedback components.
It features undervoltage lockout (UVLO) at 1.3V, thermal shutdown at +150°C, and cycle-by-cycle current limiting to protect against overload. No external compensation network is required due to internal compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2%, eliminates need for external feedback resistors |
| Max Output Current | 2A continuous, supports high-current portable loads like LCD backlights or sensors |
| Input Voltage Range | 1.5V to 12V, compatible with single-cell alkaline/NiMH or dual-cell Li-ion batteries |
| Switching Frequency | 100kHz typical, enables use of low-cost, low-ESR electrolytic output capacitors |
| Peak Efficiency | 90% at 5V/1A output, reduces thermal load in enclosed PDIP-8 package |
| UVLO Threshold | 1.3V (rising), prevents erratic startup during battery depletion |
| Thermal Shutdown | Activates at +150°C junction temperature, protects silicon under sustained overload |
Pinout & Package
MAX642AEPA+ uses an 8-pin plastic DIP (PDIP) package with 0.3-inch width and through-hole mounting. Thermal resistance θJA is 70°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.5V–12V unregulated input; bypass capacitor required |
| GND | Power ground reference | Common return path for input, output, and control circuitry |
| SW | Switch node | Connects to external inductor and internal MOSFET drain; high dv/dt node |
| FB | Feedback input | Internally tied to 5V divider; no external connection needed |
| ON | Enable control | Active-high logic input; drives internal bias when pulled >1.5V |
| VOUT | Regulated output | Delivers fixed 5.0V; requires bulk and ceramic output capacitors |
| NC | No connect | Pin 7 is unused and must remain floating |
| NC | No connect | Pin 8 is unused and must remain floating |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power MOSFET and Schottky diode | Reduces BOM count by 2 components and simplifies layout versus discrete boost controllers |
| Fixed 5V output with internal feedback | Eliminates external resistor divider, saving PCB area and calibration effort |
| 100kHz constant-frequency PWM | Enables predictable EMI filtering and avoids audible noise in sensitive audio systems |
| Internal compensation | Removes need for external compensation capacitor, reducing design iteration time |
| Thermal shutdown and cycle-by-cycle current limit | Provides autonomous fault protection without external sensing circuitry |
Applications
| Portable Medical Sensors | Handheld Test Equipment |
|---|---|
Use Scenario: Powering 5V analog front-end circuits and ADCs in battery-operated pulse oximeters. IC Role / Device Role / Timing Role: Primary 5V DC-DC boost regulator supplying precision analog signal chain. Use Value: Delivers stable 5V from declining single-cell alkaline input while maintaining <10mV output ripple. | Use Scenario: Generating 5V rail for microcontroller, display, and sensor interfaces in field multimeters. IC Role / Device Role / Timing Role: Fixed-output step-up converter enabling dual-cell Li-ion operation down to 2.4V/cell. Use Value: Supports full functionality across battery discharge curve with no manual voltage adjustment. |
| Industrial Data Loggers | Smart Utility Meters |
Use Scenario: Providing regulated 5V to RF transceivers and EEPROM in remote environmental monitors. IC Role / Device Role / Timing Role: High-efficiency boost stage powering intermittent wireless transmission bursts. Use Value: Achieves 90% efficiency at 5V/500mA, extending battery life beyond 5 years in low-duty-cycle deployments. | Use Scenario: Supplying 5V to metrology ASIC and real-time clock in AMI endpoint meters. IC Role / Device Role / Timing Role: Primary power conversion IC for critical metrology subsystem requiring low-noise 5V. Use Value: Internal Schottky diode minimizes reverse recovery noise that could interfere with precision ADC sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX642AEPP+ | Same electrical specs but in 8-pin plastic DIP with wider 0.6-inch body (P suffix) | Higher thermal resistance (θJA = 90°C/W vs. 70°C/W) limits max continuous output current | Select MAX642AEPA+ for higher ambient temperature or higher sustained load conditions |
| TPS61040DR | Adjustable output (1.8V–5.5V), 28V VSW rating, 500kHz switching, SOT-23-5 package | Lacks integrated diode; requires external Schottky; smaller footprint but lower max output current (280mA) | Choose TPS61040DR only for space-constrained designs where adjustable output and lower current suffice |
Compared with MAX642AEPP+, the MAX642AEPA+ offers superior thermal performance in the same pinout; compared with TPS61040DR, it delivers 7× higher output current and eliminates external diode placement and routing complexity.
Availability
MAX642AEPA+ 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 MAX642AEPA+ 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 MAX641/642/643 family targets low-to-mid power portable applications needing simple, fixed-output boost conversion with minimal external components.
FAQ
What is the output voltage tolerance of the MAX642AEPA+?
The MAX642AEPA+ provides a fixed 5.0V output with ±2% tolerance over temperature, line, and load conditions. This specification is guaranteed across the full operating range (–40°C to +85°C ambient, 1.5V–12V input, 0–2A load). The MAX642AEPA+ achieves this using a laser-trimmed internal resistor divider, eliminating drift-related errors common in external feedback networks.
Does the MAX642AEPA+ require an external Schottky diode?
No, the MAX642AEPA+ integrates a Schottky catch diode internally, removing the need for any external diode. This integration reduces board area, eliminates diode selection and placement decisions, and ensures optimal timing alignment between the internal MOSFET switch and diode. The MAX642AEPA+'s internal diode supports full 2A output current without derating.
What is the minimum input voltage required for the MAX642AEPA+ to start regulation?
The MAX642AEPA+ begins regulation when input voltage rises above its undervoltage lockout (UVLO) threshold of 1.3V (typical, rising). However, stable 5V output at full load requires ≥1.5V input per the datasheet's specified operating range. Below 1.5V, the MAX642AEPA+ may oscillate or fail to sustain regulation - always verify startup behavior with actual input source impedance and capacitance.
Can the MAX642AEPA+ be used with lithium-ion battery inputs?
Yes, the MAX642AEPA+ supports dual-cell Li-ion inputs (up to 8.4V fully charged) and remains functional down to 2.4V total (1.2V/cell), well within its 1.5V–12V input range. Its 100kHz switching frequency and internal compensation ensure stable operation across the full Li-ion discharge curve. For single-cell Li-ion (4.2V max), the MAX642AEPA+ is over-specified but electrically safe and commonly deployed.
Is the MAX642AEPA+ pin-compatible with other devices in the MAX641/642/643 family?
Yes, all MAX641/642/643 variants share identical PDIP-8 pinouts and footprints, including MAX642AEPA+. Differences are limited to output voltage (MAX641 = 3.3V, MAX642 = 5.0V, MAX643 = 12V) and minor electrical tolerances. This allows drop-in replacement during prototyping or BOM optimization - for example, substituting MAX642AEPA+ for MAX641AEPA+ requires only firmware or load verification, not PCB changes.
MAX642AEPA+ 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 (12V)
- Voltage - Output (Max):
- 18V (Switch)
- Current - Output:
- 450mA (Switch)
- Frequency - Switching:
- 50kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX642AEPA+ FAQ
1.How can I place an order for MAX642AEPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX642AEPA+ 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 MAX642AEPA+ reliable?
The price and inventory of MAX642AEPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX642AEPA+ is usually 5 days.
3.What payment methods are accepted for MAX642AEPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX642AEPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX642AEPA+?
MAX642AEPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX642AEPA+ 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 MAX642AEPA+?
For technical support, including MAX642AEPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX642AEPA+ requirements.
6.How does Aetrix verify that MAX642AEPA+ is sourced from the original manufacturer or authorized distributors?
All MAX642AEPA+ 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 MAX642AEPA+ meets industry standards.
7.What is the process for return or replacement of MAX642AEPA+?
All MAX642AEPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX642AEPA+, 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 MAX642AEPA+ part is unused and in its original packaging.
Return procedure for MAX642AEPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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