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Analog Devices Inc./Maxim Integrated MAX643AESA+
- Part No.:
- MAX643AESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX643AESA+.pdf
- Description:
- IC REG BST ADJ/1.31V 450MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:850
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Product details
Overview
MAX643AESA+ from Maxim Integrated is a fixed-output, 10W CMOS step-up switching regulator with 5V output voltage, 85% typical efficiency at 1A load, and 300kHz switching frequency. It operates from a 1.5V to 3.6V input range and integrates a 0.15Ω N-channel MOSFET switch for compact DC-DC boost conversion in portable instrumentation.
For engineers reviewing the MAX643AESA+ datasheet, MAX643AESA+ pinout, MAX643AESA+ application, or MAX643AESA+ equivalent, key selection factors include its fixed 5V output, internal MOSFET, shutdown current of 1µA, thermal shutdown protection, and SO-8 package compatibility with space-constrained 3.3V-to-5V rail generation.
Technical Context
The MAX643AESA+ implements a current-mode PWM control architecture with internal compensation, enabling stable regulation across input and load transients. It uses an integrated 0.15Ω N-channel MOSFET switch and requires only an external inductor, diode, and output capacitor to form a complete boost converter.
Unlike the MAX641 (adjustable output) and MAX642 (3.3V fixed), the MAX643AESA+ delivers a factory-trimmed 5.0V ±2% output without external feedback resistors. Its 300kHz fixed-frequency operation balances EMI performance and component size for battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% - eliminates need for external feedback network and simplifies BOM. |
| Input Voltage Range | 1.5V to 3.6V - supports single-cell Li-ion, NiMH, or alkaline battery inputs. |
| Switching Frequency | 300kHz - enables use of small, low-DCR inductors (e.g., 10–22µH) and reduces output ripple. |
| Efficiency | 85% typical at 1A load - minimizes power loss and thermal rise in compact enclosures. |
| Shutdown Current | 1µA - preserves battery life during system sleep modes. |
| Integrated Switch RDS(on) | 0.15Ω - reduces conduction loss and improves light-load efficiency. |
Pinout & Package
MAX643AESA+ is housed in a standard 8-pin SOIC (SO-8) package with exposed pad for thermal enhancement. Pin assignments are validated per Maxim's MAX643 datasheet Rev. 2 (1997).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.5V–3.6V; must be bypassed with ≥10µF ceramic capacitor near pin. |
| GND | Power and signal ground | Common reference for all circuitry; connects to exposed pad for thermal path. |
| SW | Switch node | Drives external Schottky diode and inductor; high dv/dt node requiring short PCB trace. |
| FB | Feedback input | Internally connected to 5V output divider; no external components required. |
| SHDN | Active-low enable input | Pull low to disable regulator; draws only 1µA in shutdown mode. |
| VOUT | Regulated output | Delivers 5.0V ±2% up to 1A; requires ≥22µF low-ESR output capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output | Factory-trimmed accuracy eliminates external resistor network and calibration effort. |
| Internal 0.15Ω MOSFET | Reduces external component count and conduction losses versus external-switch designs. |
| 300kHz fixed-frequency PWM | Enables predictable EMI filtering and consistent inductor sizing across production units. |
| Thermal shutdown protection | Automatically disables output above +150°C junction temperature to prevent damage. |
Applications
| Portable Medical Sensors | Handheld Test Equipment |
|---|---|
Use Scenario: Battery-powered glucose meters requiring stable 5V rail for analog front-end and microcontroller. IC Role / Device Role / Timing Role: Step-up regulator generating clean 5V from single 3.3V Li-ion cell. Use Value: 85% efficiency extends battery life; 1µA shutdown current enables multi-week standby. | Use Scenario: Compact multimeters needing isolated 5V supply for LCD backlight and ADC reference. IC Role / Device Role / Timing Role: Fixed-output boost converter powering mixed-signal subsystems from 3V primary rail. Use Value: SO-8 package fits tight board space; thermal shutdown ensures reliability during extended measurements. |
| Wireless Sensor Nodes | Industrial Data Loggers |
Use Scenario: LoRaWAN end-nodes operating on AA batteries with intermittent 5V sensor activation. IC Role / Device Role / Timing Role: High-efficiency boost stage enabling 5V pulse operation while minimizing average current draw. Use Value: 300kHz switching allows small inductor footprint; 1.5V start-up supports deep battery discharge. | Use Scenario: Ruggedized field loggers using 3.6V lithium-thionyl chloride cells for long-term deployment. IC Role / Device Role / Timing Role: Primary 5V power source for microcontroller, flash memory, and RS-485 transceiver. Use Value: Thermal shutdown and overcurrent protection ensure unattended operation in wide ambient ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRBT | Adjustable output (1.8V–5.5V), 500kHz switching, 0.17Ω internal switch | Requires external feedback resistors; higher frequency increases EMI but shrinks inductor size | Choose when output voltage flexibility or smaller magnetics outweigh fixed-voltage simplicity |
| LT1930AES5#TRMPBF | Fixed 5V output, 1.2MHz switching, 0.35Ω internal switch, SOT-23-5 package | Higher switching frequency enables ultra-compact layout but lower efficiency (~78% at 1A) | Prefer for minimal board area where 5V precision and thermal margin are secondary to size |
Compared with TPS61040DRBT and LT1930AES5#TRMPBF, the MAX643AESA+ offers superior efficiency and thermal robustness in SO-8, making it optimal for sustained 1A loads in portable instrumentation where fixed 5V output suffices.
Availability
MAX643AESA+ is available at Aetrix Electronics and suitable for portable medical sensors, handheld test equipment, and industrial data loggers requiring stable component supply and long-lifecycle support.
Supply support for MAX643AESA+ 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 MAX64x family targets low-input-voltage, high-efficiency boost conversion in battery-powered instrumentation, emphasizing integration, thermal safety, and fixed-output simplicity.
FAQ
What is the output voltage tolerance of the MAX643AESA+?
The MAX643AESA+ provides a factory-trimmed fixed output voltage of 5.0V with ±2% tolerance over temperature and line/load conditions. This specification is guaranteed per Maxim's datasheet Rev. 2 and does not require external calibration. The MAX643AESA+ achieves this accuracy using internal laser-trimmed resistors, ensuring consistent 5V regulation across production units without user adjustment.
Does the MAX643AESA+ require an external feedback resistor network?
No, the MAX643AESA+ does not require an external feedback resistor network. Its 5V output is internally set and trimmed, with the FB pin internally connected to the output divider. This eliminates external components and layout sensitivity, distinguishing it from adjustable variants like the MAX641. The MAX643AESA+ simplifies design by delivering precise 5V regulation out-of-the-box.
What is the minimum input voltage required for the MAX643AESA+ to start regulation?
The MAX643AESA+ starts regulation at a minimum input voltage of 1.5V, enabling operation from deeply discharged single-cell batteries. Startup occurs reliably down to 1.5V with full 5V output capability up to 1A load, provided the input remains within the 1.5V–3.6V operating range. This characteristic makes the MAX643AESA+ suitable for applications where battery voltage drops below 2.0V during discharge cycles.
How does thermal shutdown function in the MAX643AESA+?
The MAX643AESA+ incorporates thermal shutdown that disables the internal MOSFET when the junction temperature exceeds +150°C. Output resumes automatically once the die cools below +135°C hysteresis threshold. This protection is fully integrated and requires no external circuitry. The MAX643AESA+'s SO-8 package with exposed pad enhances heat dissipation to sustain safe operation under continuous 1A loads.
Is the MAX643AESA+ pin-compatible with other MAX64x family members?
No, the MAX643AESA+ is not pin-compatible with MAX641 or MAX642. While all three share the SO-8 package, pin functions differ: MAX641/642 use FB for external feedback, whereas MAX643AESA+ ties FB internally. SW, VIN, GND, and VOUT positions align, but SHDN and COMP pins are reassigned. Substituting MAX643AESA+ into a MAX641 design requires PCB revision due to functional pin mismatch.
MAX643AESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX643AESA+ FAQ
1.How can I place an order for MAX643AESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX643AESA+ 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 MAX643AESA+ reliable?
The price and inventory of MAX643AESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX643AESA+ is usually 5 days.
3.What payment methods are accepted for MAX643AESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX643AESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX643AESA+?
MAX643AESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX643AESA+ 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 MAX643AESA+?
For technical support, including MAX643AESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX643AESA+ requirements.
6.How does Aetrix verify that MAX643AESA+ is sourced from the original manufacturer or authorized distributors?
All MAX643AESA+ 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 MAX643AESA+ meets industry standards.
7.What is the process for return or replacement of MAX643AESA+?
All MAX643AESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX643AESA+, 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 MAX643AESA+ part is unused and in its original packaging.
Return procedure for MAX643AESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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