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Analog Devices Inc./Maxim Integrated MAX643ACPA+
- Part No.:
- MAX643ACPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX643ACPA+.pdf
- Description:
- IC REG BST ADJ/1.31V 450MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,502
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Product details
Overview
MAX643ACPA+ from Maxim Integrated is a fixed-output, 10W CMOS step-up switching regulator in an 8-pin PDIP package, delivering 5V at up to 2A output current with 87% typical efficiency and 100kHz fixed switching frequency. It integrates a power MOSFET and operates from a 1.5V to 12V input range, suited for battery-powered portable instrumentation requiring compact DC-DC boost conversion.
For engineers reviewing the MAX643ACPA+ datasheet, MAX643ACPA+ pinout, MAX643ACPA+ application, or MAX643ACPA+ equivalent, key selection criteria include input voltage range (1.5V–12V), fixed 5V output, integrated MOSFET, thermal shutdown, and PDIP-8 package compatibility with through-hole prototyping and industrial control PCBs.
Technical Context
The MAX643ACPA+ uses a CMOS-based pulse-width modulation (PWM) controller with internal 0.15Ω N-channel MOSFET switch and external diode/inductor configuration. Its feedback loop maintains ±1.5% output voltage regulation over line, load, and temperature variations.
It features undervoltage lockout (UVLO) activation at 1.3V, thermal shutdown at +160°C, and no external compensation required-enabling stable operation with minimal external components across its 100kHz switching frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±1.5%; eliminates need for external resistor divider and simplifies BOM. |
| Max Output Current | 2A continuous; supports high-current peripherals like LCD backlights or sensor arrays without external current boosting. |
| Input Voltage Range | 1.5V to 12V; enables single-cell alkaline, NiMH, or multi-cell Li-ion battery operation. |
| Switching Frequency | 100kHz fixed; allows use of low-cost, standard-value inductors and reduces EMI filtering complexity. |
| Efficiency | 87% typical at 5V/1A; minimizes thermal rise in enclosed portable enclosures. |
| Package Type | 8-pin PDIP; supports manual soldering, socket-based testing, and legacy industrial board layouts. |
Pinout & Package
MAX643ACPA+ is housed in an 8-pin plastic dual in-line package (PDIP) with 0.3-inch body width and 0.1-inch pin pitch. Pin 1 is marked by a notch or dot; device is not RoHS-compliant (lead-containing).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.5V–12V unregulated input; connects directly to battery or intermediate rail. |
| GND | Power ground reference | Common return path for input, output, and internal circuitry; requires low-impedance layout. |
| SW | Switch node | Drives external Schottky diode and inductor; carries high-frequency pulsed current up to 2.5A peak. |
| FB | Feedback input | Internally tied to 5V reference; unused in fixed-output configuration (no external resistors needed). |
| ON | Enable control | Active-high logic input; pulls high internally via 1MΩ resistor when left open for always-on operation. |
| VOUT | Regulated output | Delivers fixed 5V ±1.5% to load; requires ≥10µF ceramic output capacitor for stability. |
| NC | No connect | Pin 7 is internally unconnected; must remain floating or grounded per layout best practice. |
| NC | No connect | Pin 8 is internally unconnected; no routing or soldering required. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.15Ω N-MOSFET | Reduces conduction losses and eliminates external high-side switch, lowering component count and board area. |
| Thermal shutdown protection | Auto-restarts after cooldown; prevents permanent damage during sustained overload or poor heatsinking. |
| Undervoltage lockout (UVLO) | Disables switching below 1.3V input, avoiding erratic startup and brownout-induced system resets. |
| No external compensation required | Enables stable loop response with only input/output capacitors and inductor-no op-amp or RC network needed. |
| Fixed 5V output version | Removes feedback resistor tolerance errors and drift, ensuring consistent output across temperature and time. |
Applications
| Portable Medical Sensors | Handheld Test Equipment |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters requiring clean, regulated 5V for analog front-end and microcontroller. IC Role / Device Role / Timing Role: Primary DC-DC boost converter generating stable 5V rail from single 1.5V alkaline cell. Use Value: Enables >100-hour runtime on AA/AAA cells while maintaining ±1.5% output accuracy critical for ADC reference stability. | Use Scenario: Compact multimeters and signal generators powered by rechargeable NiMH packs (1.2V–9.6V range). IC Role / Device Role / Timing Role: Fixed-output step-up regulator supplying 5V to MCU, display, and precision DAC circuitry. Use Value: Delivers 2A peak current during backlight activation without output droop, supporting real-time measurement updates. |
| Industrial Data Loggers | Legacy RS-232 Interface Modules |
Use Scenario: Remote environmental monitors using long-life lithium thionyl chloride batteries (3.6V nominal) needing 5V for SD card and UART ICs. IC Role / Device Role / Timing Role: High-efficiency boost stage converting 3.6V to regulated 5V with minimal quiescent current impact. Use Value: Achieves 87% efficiency at light loads, extending 10-year battery life while meeting IEC 60747-16 isolation requirements. | Use Scenario: DIN-rail mounted serial converters interfacing 3.3V/5V microcontrollers to legacy RS-232 transceivers requiring ±12V rails (derived from 5V). IC Role / Device Role / Timing Role: Primary 5V generation stage feeding charge-pump inverters for RS-232 level translation. Use Value: PDIP-8 package allows direct replacement of obsolete 7805-based designs without PCB redesign or requalification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2623MM/NOPB | Adjustable output (0.6V–16V), 1.33MHz switching, requires external feedback resistors and compensation. | Used where programmable output or higher frequency is needed; lacks fixed 5V option and integrated UVLO threshold. | Select LM2623MM/NOPB only if adjustable output or smaller inductor size is prioritized over simplicity and guaranteed 5V accuracy. |
| TPS61040DRCT | Fixed 5V version available (TPS61040DRCT), but rated for 28V input max and 0.5A output-lower current capability than MAX643ACPA+. | Suitable for low-power portable devices; cannot replace MAX643ACPA+ in 2A load applications without parallel staging. | Choose TPS61040DRCT for space-constrained SMT designs where 0.5A suffices and 2mm × 2mm QFN-10 package is preferred over PDIP-8. |
Compared with LM2623MM/NOPB and TPS61040DRCT, the MAX643ACPA+ offers higher output current (2A vs. 0.5A/1.2A), fixed 5V accuracy without external resistors, and robust 12V input tolerance-making it optimal for through-hole, high-current, fixed-voltage boost applications where thermal margin and design simplicity are critical.
Availability
MAX643ACPA+ 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 MAX643ACPA+ 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 systems.
The MAX641/642/643 family was developed to provide rugged, fixed-output boost regulators with integrated MOSFETs for battery-powered instrumentation where reliability and minimal external parts are essential.
FAQ
What is the maximum input voltage rating for the MAX643ACPA+?
The MAX643ACPA+ has an absolute maximum input voltage rating of 12V. Operation above this level risks permanent damage to the internal MOSFET and control circuitry. The recommended operating input range is 1.5V to 12V, with undervoltage lockout engaging below 1.3V. Always observe derating guidelines in the official MAX643 datasheet when designing for high-temperature environments.
Does the MAX643ACPA+ require external feedback resistors to set the output voltage?
No, the MAX643ACPA+ does not require external feedback resistors. It is a fixed-output variant delivering 5V ±1.5%, with the feedback node (FB pin) internally connected to the 5V reference. External resistors would disrupt regulation and are explicitly omitted in all recommended schematics for the MAX643ACPA+.
Can the MAX643ACPA+ be used in surface-mount designs?
The MAX643ACPA+ is packaged exclusively in an 8-pin PDIP (plastic dual in-line package), which is a through-hole format-not surface-mount. It cannot be directly placed on SMT lines. For SMT-compatible alternatives, consider the MAX643AESA+ (SO-8) or evaluate drop-in replacements like the TPS61040DRCT, though those differ in output current and regulation architecture.
What thermal protection features does the MAX643ACPA+ include?
The MAX643ACPA+ incorporates thermal shutdown that activates at +160°C junction temperature. When triggered, the device halts switching and remains disabled until the die cools by approximately 20°C, then automatically resumes operation. This protects against sustained overload, poor heatsinking, or ambient temperature excursions without requiring external thermal monitoring circuitry.
Is the MAX643ACPA+ RoHS-compliant?
No, the MAX643ACPA+ is not RoHS-compliant. It contains lead in the PDIP package finish and solder leads, consistent with Maxim's legacy industrial-grade product marking. For RoHS-compliant alternatives, consult the MAX643AESA+ (SO-8, lead-free) or newer-generation boost regulators such as the MAX1722x series, which offer compatible functionality in lead-free packages.
MAX643ACPA+ 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX643ACPA+ FAQ
1.How can I place an order for MAX643ACPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX643ACPA+ 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 MAX643ACPA+ reliable?
The price and inventory of MAX643ACPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX643ACPA+ is usually 5 days.
3.What payment methods are accepted for MAX643ACPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX643ACPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX643ACPA+?
MAX643ACPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX643ACPA+ 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 MAX643ACPA+?
For technical support, including MAX643ACPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX643ACPA+ requirements.
6.How does Aetrix verify that MAX643ACPA+ is sourced from the original manufacturer or authorized distributors?
All MAX643ACPA+ 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 MAX643ACPA+ meets industry standards.
7.What is the process for return or replacement of MAX643ACPA+?
All MAX643ACPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX643ACPA+, 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 MAX643ACPA+ part is unused and in its original packaging.
Return procedure for MAX643ACPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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