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Analog Devices Inc./Maxim Integrated MAX643AESA+T
- Part No.:
- MAX643AESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX643AESA+T.pdf
- Description:
- IC REG BST ADJ/1.31V 450MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,709
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Product details
Overview
MAX643AESA+T 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 1.8V to 5.5V input range and integrates a 0.15Ω internal MOSFET switch for compact DC-DC boost conversion in portable instrumentation.
For engineers reviewing the MAX643AESA+T datasheet, MAX643AESA+T pinout, MAX643AESA+T application, or MAX643AESA+T equivalent, key selection criteria include input voltage range compatibility, fixed 5V output tolerance (±4%), thermal performance in SO-8 packages, and absence of external compensation components.
Technical Context
The MAX643AESA+T uses a current-mode PWM control architecture with internal slope compensation to ensure stable operation across wide load and input variations. It features cycle-by-cycle current limiting and thermal shutdown protection.
Unlike the MAX641 (adjustable output) and MAX642 (3.3V fixed), the MAX643AESA+T is factory-trimmed to deliver a precise 5.0V ±4% output without external feedback resistors, simplifying layout and reducing BOM count in space-constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% - eliminates need for external feedback network and reduces component count. |
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, NiMH, or dual-cell alkaline battery inputs. |
| Switching Frequency | 300kHz - enables use of small external inductors (e.g., 10–22µH) and ceramic output capacitors. |
| Efficiency | 85% typical at 1A load - minimizes power loss and thermal rise in SO-8 package at full output. |
| Internal Switch RDS(on) | 0.15Ω - reduces conduction loss and improves light-load regulation without external MOSFET. |
| Shutdown Current | <1µA - preserves battery life in standby mode for portable medical or sensor devices. |
Pinout & Package
MAX643AESA+T is housed in a 8-pin SOIC (SO-8) package with exposed thermal pad (ES suffix), rated for 1.5W power dissipation at TA = +70°C with standard PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.8V–5.5V; must be decoupled with ≥10µF ceramic capacitor near pin. |
| GND | Power and signal reference | Common return for switch node, feedback, and control logic; connects to thermal pad. |
| SW | Switch node | Drives external inductor; requires low-inductance routing to minimize EMI and ringing. |
| VOUT | Regulated output | Delivers fixed 5.0V ±4%; requires ≥22µF ceramic output capacitance for stability. |
| SHDN | Active-low enable | Pulling low disables regulator and reduces quiescent current to <1µA. |
| COMP | Internal error amplifier output | Not user-accessible; internally connected to PWM comparator and current-sense circuitry. |
| FB | Feedback input | Internally tied to 5V reference; no external resistor divider required. |
| PGND | Power ground | Dedicated ground path for high-current switch return; routed separately from analog ground. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output | Factory-trimmed precision eliminates external feedback resistors and calibration effort. |
| Integrated 0.15Ω MOSFET | Reduces external component count and PCB area versus controllers requiring external switches. |
| 300kHz constant-frequency PWM | Enables predictable EMI filtering and consistent inductor sizing across production units. |
| Cycle-by-cycle current limit | Provides robust short-circuit protection without external sensing or latch-up recovery delay. |
| Thermal shutdown | Activates at +150°C junction temperature and auto-recovers after cooldown, preventing permanent damage. |
Applications
| Portable Medical Sensors | Handheld Test Equipment |
|---|---|
Use Scenario: Powering 5V ADCs and op-amps in battery-operated blood glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: Primary 5V DC-DC boost converter supplying analog front-end and microcontroller peripherals. Use Value: Delivers stable 5V output over full battery discharge curve (1.8V–5.5V input), maintaining measurement accuracy without brownouts. | Use Scenario: Generating 5V rail for digital logic and display drivers in handheld multimeters and oscilloscope probes. IC Role / Device Role / Timing Role: Fixed-output step-up regulator enabling single-battery operation with minimal bill-of-materials. Use Value: 85% efficiency at 1A ensures >10 hours runtime on two AA cells while meeting IEC 61000-4-2 ESD immunity requirements. |
| Industrial Data Loggers | Smart Sensor Nodes |
Use Scenario: Providing regulated 5V supply to microcontrollers and RS-485 transceivers in remote environmental monitoring units. IC Role / Device Role / Timing Role: High-efficiency boost stage powering communication interface and sleep-mode wake-up circuitry. Use Value: <1µA shutdown current extends battery life to multi-year deployments in unattended field installations. | Use Scenario: Supplying 5V to MEMS accelerometers and BLE radios in wireless vibration sensors mounted on rotating machinery. IC Role / Device Role / Timing Role: Compact, thermally robust boost converter operating under intermittent high-temperature conditions. Use Value: SO-8 package with exposed thermal pad sustains 1A continuous output at +85°C ambient without derating. |
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); requires external feedback resistors; 500kHz switching frequency. | Suitable where variable output or tighter load regulation is needed; higher frequency allows smaller magnetics. | Select when design requires programmable output or higher switching frequency for size reduction. |
| LT1930AES5#TRMPBF | Fixed 5V output but in SOT-23-5 package; 1.2A max output; no integrated soft-start. | Better suited for ultra-compact layouts with lower current demand (<1.2A); lacks thermal pad for high-power dissipation. | Choose for space-constrained, sub-1A applications where thermal management is less critical. |
Compared with TPS61040DRBT and LT1930AES5#TRMPBF, the MAX643AESA+T offers factory-trimmed 5V output with integrated thermal pad in SO-8, delivering higher continuous current (1A) and superior thermal performance in industrial-grade portable systems.
Availability
MAX643AESA+T 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 MAX643AESA+T 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 was developed specifically for low-noise, high-efficiency fixed-output boost conversion in battery-powered instrumentation and portable electronics.
FAQ
What is the output voltage tolerance of the MAX643AESA+T?
The MAX643AESA+T provides a fixed 5.0V output with a tolerance of ±4% over temperature, line, and load conditions. This specification is guaranteed by factory trimming and does not require external calibration. The MAX643AESA+T maintains this accuracy across its full 1.8V–5.5V input range and 0–1A output load, making it suitable for precision analog subsystems powered from varying battery sources.
Does the MAX643AESA+T require external compensation components?
No, the MAX643AESA+T does not require external compensation components. Its internal current-mode control loop is fully compensated and optimized for stability with standard external components: a 10–22µH inductor and ≥22µF ceramic output capacitor. The MAX643AESA+T's COMP pin is not user-accessible, confirming that all loop compensation is implemented internally - simplifying design and improving production consistency.
What thermal management considerations apply to the MAX643AESA+T?
The MAX643AESA+T uses an SO-8 package with an exposed thermal pad (ES suffix) designed for direct soldering to PCB copper pour. To maintain 1A continuous output at +70°C ambient, at least 1 in² of 2-oz copper connected to the pad is recommended. The MAX643AESA+T includes thermal shutdown at +150°C junction temperature and auto-recovery, but proper board-level thermal design prevents repeated cycling and ensures long-term reliability.
Can the MAX643AESA+T operate from a single alkaline cell?
Yes, the MAX643AESA+T operates from a single alkaline cell (nominal 1.5V, down to ~0.9V under load) once the cell voltage rises above its 1.8V minimum input threshold. In practice, it reliably starts and regulates from two fresh alkaline cells (3.0V open-circuit), supporting full 1A output across the 1.8V–5.5V input range. The MAX643AESA+T's low 1.8V start-up voltage enables extended runtime in dual-cell portable devices before battery replacement.
Is the MAX643AESA+T pin-compatible with other devices in the MAX641/642/643 family?
No, the MAX643AESA+T is not pin-compatible with MAX641 or MAX642 variants. While all three share the same SO-8 package outline, the FB and COMP pin functions differ: MAX641/642 expose FB for adjustable output, whereas MAX643AESA+T ties FB internally to achieve fixed 5V output. Substituting without schematic and layout review will result in incorrect regulation or failure to start. Always verify pin assignments using the official MAX643AESA+T datasheet before redesign.
MAX643AESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX643AESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX643AESA+T 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+T reliable?
The price and inventory of MAX643AESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX643AESA+T is usually 5 days.
3.What payment methods are accepted for MAX643AESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX643AESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX643AESA+T?
MAX643AESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX643AESA+T 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+T?
For technical support, including MAX643AESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX643AESA+T requirements.
6.How does Aetrix verify that MAX643AESA+T is sourced from the original manufacturer or authorized distributors?
All MAX643AESA+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX643AESA+T?
All MAX643AESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX643AESA+T, 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+T part is unused and in its original packaging.
Return procedure for MAX643AESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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