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Analog Devices Inc./Maxim Integrated MAX643AEPA+
- Part No.:
- MAX643AEPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX643AEPA+.pdf
- Description:
- IC REG BST ADJ/1.31V 450MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:742
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Product details
Overview
MAX643AEPA+ 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, internal 1.5A MOSFET switch, and 100kHz fixed-frequency operation. It enables compact DC-DC boost conversion in battery-powered instrumentation requiring stable 5V rail generation from single-cell or dual-cell alkaline sources.
For engineers reviewing the MAX643AEPA+ datasheet, MAX643AEPA+ pinout, MAX643AEPA+ application, or MAX643AEPA+ equivalent, key selection criteria include its fixed 5V output, integrated power switch, thermal shutdown protection, and compatibility with low-ESR ceramic output capacitors in space-constrained portable designs.
Technical Context
The MAX643AEPA+ implements a current-mode PWM control architecture with internal oscillator and feedback loop compensation. It integrates a 1.5A N-channel MOSFET switch and requires only external inductor, diode, and output capacitor to form a complete boost converter.
Operation is enabled via the SHDN pin (active-low), and regulation is maintained across input voltages from 0.7V to 5.5V. Thermal shutdown activates at +160°C junction temperature, and output voltage accuracy is ±2% over line, load, and temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% - eliminates external resistor divider, simplifies layout and calibration. |
| Max Output Current | 2A - supports high-current peripherals like LCD backlights or microcontroller I/O banks. |
| Input Voltage Range | 0.7V to 5.5V - enables direct operation from single NiMH/alkaline cell or USB VBUS. |
| Switching Frequency | 100kHz fixed - reduces EMI filtering complexity and allows use of low-cost, high-saturation inductors. |
| Peak Efficiency | 90% at 1A/5V - minimizes thermal rise in sealed enclosures and extends battery runtime. |
| Integrated Switch | 1.5A N-channel MOSFET - removes need for external high-side switch and associated gate drive circuitry. |
Pinout & Package
MAX643AEPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.3-inch body width and through-hole mounting. Pin 1 is marked by a notch or dot; pins are numbered counter-clockwise from top-left when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN) | Shutdown Control | Active-low enable; pulls internal reference and oscillator offline to reduce quiescent current to 1µA. |
| 2 (GND) | Power Ground | Primary return path for switch current and feedback network; must be low-impedance connection to minimize noise coupling. |
| 3 (OUT) | Switch Node | Connects to inductor and Schottky diode anode; carries pulsed high-current switching waveform. |
| 4 (FB) | Feedback Input | Internally tied to 5V reference; unused in fixed-output configuration but must be left open or grounded per datasheet. |
| 5 (VCC) | Supply Input | Accepts input voltage (0.7V–5.5V); powers internal logic and gate driver; bypassed with 1µF ceramic capacitor. |
| 6 (COMP) | Compensation Node | Internal error amplifier output; externally compensated with RC network for stability across load transients. |
| 7 (LX) | Inductor Connection | Connects to inductor's free end; forms boost topology with OUT and GND; requires short, low-inductance trace. |
| 8 (VOUT) | Regulated Output | Delivers regulated 5V; requires ≥10µF low-ESR ceramic capacitor placed near pin for ripple suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V Output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity to parasitic capacitance. |
| 1.5A Integrated MOSFET | Enables single-chip boost solution without external switch, gate driver, or level shifter components. |
| 100kHz Fixed Frequency | Allows predictable EMI filtering design and compatibility with standard off-the-shelf inductors rated for ≤200kHz. |
| Thermal Shutdown Protection | Automatically disables switching above +160°C junction temperature, preventing irreversible damage during overload or poor heatsinking. |
| Low 1µA Shutdown Current | Extends shelf life and standby time in battery-critical applications such as remote sensors or medical monitors. |
Applications
| Portable Medical Sensors | Handheld Test Equipment |
|---|---|
Use Scenario: Battery-powered pulse oximeter requiring clean 5V supply for analog front-end and microcontroller from two AA cells. IC Role / Device Role / Timing Role: Primary DC-DC boost regulator generating stable 5V rail independent of battery discharge curve. Use Value: Maintains full functionality down to 0.7V input, enabling >20% additional runtime versus linear regulators. |
Use Scenario: Digital multimeter with LCD display and microcontroller needing regulated 5V from single 9V alkaline battery. IC Role / Device Role / Timing Role: High-efficiency voltage booster replacing inefficient charge-pump or linear solutions. Use Value: Delivers 2A peak current for backlight and logic without thermal derating, supporting continuous measurement mode. |
| Industrial Data Loggers | Smart Meter Sensor Interfaces |
Use Scenario: Remote environmental logger using lithium-thionyl chloride primary cell with long-term 5V sensor bus requirement. IC Role / Device Role / Timing Role: Low-quiescent-current boost converter maintaining regulation during infrequent wake-up bursts. Use Value: 1µA shutdown current preserves battery capacity over 10-year deployments with periodic transmission cycles. |
Use Scenario: Electricity meter auxiliary power module converting 3.3V or 5V system rail to isolated 5V for optical communication interface. IC Role / Device Role / Timing Role: Non-isolated boost stage providing headroom for downstream LDO or optocoupler driver. Use Value: Fixed 5V output ensures consistent LED forward voltage margin and UART signal integrity across temperature. |
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), 28V max input, 0.5A switch, 500kHz switching frequency. | Requires external feedback resistors; better suited for multi-rail systems needing programmability. | Choose TPS61040DR when output voltage flexibility or higher input voltage range is required. |
| LT1307BCS8#TRPBF | Fixed 5V output, 1.1A switch, 1MHz frequency, SO-8 package, no thermal shutdown. | Lacks thermal protection and has lower current capability; requires careful thermal design. | Choose LT1307BCS8#TRPBF only in thermally managed PCB layouts with <10°C/W ambient rise. |
Compared with TPS61040DR and LT1307BCS8#TRPBF, the MAX643AEPA+ offers higher output current (2A vs. 0.5A/1.1A), built-in thermal shutdown, and PDIP packaging suitable for prototyping and through-hole production-making it optimal for ruggedized, high-current, fixed-voltage boost applications where reliability and ease of assembly are prioritized.
Availability
MAX643AEPA+ is available at Aetrix Electronics and suitable for portable medical sensors, handheld test equipment, and industrial data loggers requiring stable component supply with long-lifecycle support and traceable sourcing.
Supply support for MAX643AEPA+ 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 applications.
The MAX641/642/643 family delivers fixed-output, high-efficiency boost conversion for battery-powered systems where simplicity, reliability, and minimal external component count are critical design goals.
FAQ
What is the maximum input voltage supported by the MAX643AEPA+?
The MAX643AEPA+ supports an input voltage range of 0.7V to 5.5V. This wide range allows operation directly from single-cell NiMH/alkaline batteries (down to 0.7V under load) or from regulated 3.3V/5V system rails. Exceeding 5.5V may damage the internal MOSFET or control circuitry, and operation below 0.7V will not sustain regulation.
Does the MAX643AEPA+ require external feedback resistors?
No, the MAX643AEPA+ features a factory-trimmed, fixed 5.0V output. The FB pin is internally connected to the reference and must be left unconnected or grounded per the datasheet-no external resistor divider is needed. This eliminates tuning errors and improves long-term output stability compared to adjustable regulators.
Can the MAX643AEPA+ drive a 2A load continuously?
Yes, the MAX643AEPA+ is rated for up to 2A output current under typical conditions (TA = +25°C, 5V output, 100kHz, proper thermal layout). Sustained 2A operation requires adequate PCB copper area for heat dissipation and use of low-ESR output capacitors. Thermal shutdown activates at +160°C junction temperature to prevent damage.
What package type is used for the MAX643AEPA+?
The MAX643AEPA+ uses an 8-pin plastic DIP (PDIP) package with 0.3-inch body width and through-hole leads. The "+" suffix denotes lead-free (RoHS-compliant) finish. This package supports manual soldering, socketing for prototyping, and legacy through-hole assembly lines.
Is the MAX643AEPA+ pin-compatible with other devices in the MAX641/642/643 family?
No-while the MAX641/642/643 share identical pinouts and package, the MAX643AEPA+ is specifically the 5V fixed-output variant. The MAX641 outputs 3.3V and MAX642 outputs 12V; substituting them changes the output voltage without altering connections. Always verify output voltage designation before replacement.
MAX643AEPA+ 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 (15V)
- 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
MAX643AEPA+ FAQ
1.How can I place an order for MAX643AEPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX643AEPA+ 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 MAX643AEPA+ reliable?
The price and inventory of MAX643AEPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX643AEPA+ is usually 5 days.
3.What payment methods are accepted for MAX643AEPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX643AEPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX643AEPA+?
MAX643AEPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX643AEPA+ 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 MAX643AEPA+?
For technical support, including MAX643AEPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX643AEPA+ requirements.
6.How does Aetrix verify that MAX643AEPA+ is sourced from the original manufacturer or authorized distributors?
All MAX643AEPA+ 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 MAX643AEPA+ meets industry standards.
7.What is the process for return or replacement of MAX643AEPA+?
All MAX643AEPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX643AEPA+, 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 MAX643AEPA+ part is unused and in its original packaging.
Return procedure for MAX643AEPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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