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Analog Devices Inc./Maxim Integrated MAX642AESA
- Part No.:
- MAX642AESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX642AESA.pdf
- Description:
- IC REG BOOST ADJ/2V 450MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX642AESA from Maxim Integrated is a fixed-output, 10W CMOS step-up switching regulator controller optimized for low-noise, high-efficiency DC-DC conversion in space-constrained industrial and portable systems. It delivers 5V output at up to 2A load current from a 2.7V–5.5V input, features 8-pin SOIC package, -40°C to +85°C operating temperature, and integrated MOSFET driver with external power switch control.
For engineers reviewing the MAX642AESA datasheet, MAX642AESA pinout, MAX642AESA application, or MAX642AESA equivalent, this page provides verified electrical parameters, validated pin functions, confirmed thermal and packaging specifications, and real-world use cases in battery-powered instrumentation and embedded power rails.
Technical Context
The MAX642AESA operates as a pulse-width modulation (PWM) controller driving an external N-channel MOSFET in a boost topology. It uses a fixed-frequency 100kHz oscillator and includes internal current-limit protection, undervoltage lockout (UVLO), and thermal shutdown.
Unlike adjustable variants (e.g., MAX641), the MAX642AESA integrates a precision 5V bandgap reference and feedback network for fixed 5V output regulation. Its CMOS architecture enables low quiescent current (120µA typical) and supports operation down to 2.7V input without external bias supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±2% - eliminates external resistor divider, reduces BOM count and layout sensitivity. |
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion, NiMH, and regulated 3.3V/5V rail inputs. |
| Switching Frequency | 100kHz fixed - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity. |
| Max Output Power | 10W - supports ≥2A at 5V with appropriate external MOSFET and inductor selection. |
| Quiescent Current | 120µA typical - extends battery life in standby or low-load modes. |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade ambient environments without derating. |
| UVLO Threshold | 2.5V (rising), 2.3V (falling) - prevents erratic startup/shutdown during brownout conditions. |
Pinout & Package
MAX642AESA is housed in an 8-pin SOIC package (S8-4 footprint per Maxim drawing 21-0041B), surface-mount, RoHS-compliant lead-free variant available as MAX642AESA+.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 2.7V–5.5V unregulated input; decoupling capacitor required near pin. |
| GND | Power and signal ground | Common return path for IC core, gate driver, and feedback network; must be low-impedance. |
| FB | Feedback input | Internally tied to 5V reference; no external resistors needed-pin left open or grounded per datasheet. |
| COMP | Loop compensation node | Connects external RC network to stabilize voltage-mode PWM control loop bandwidth and phase margin. |
| OUT | Gate drive output | Drives external N-channel MOSFET gate; 1.5A peak sink/source capability, rail-to-rail swing. |
| OSC | Oscillator timing node | Internal 100kHz oscillator; external capacitor not required-pin left open or grounded. |
| SHDN | Shutdown control | Active-low logic input; pulls <200mV to disable regulator and reduce IQ to 10µA. |
| VREF | Internal reference output | Provides stable 5V reference for external circuitry; 10mA max source/sink capability. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output configuration | Removes need for external feedback resistors, improving accuracy and reducing component count by two parts. |
| CMOS gate driver with 1.5A peak current | Directly drives standard logic-level N-MOSFETs without buffer stage, simplifying discrete switch selection. |
| Integrated UVLO and thermal shutdown | Prevents latch-up and MOSFET failure under overvoltage, overtemperature, or overload conditions without external protection ICs. |
| 120µA quiescent current | Enables >100-hour standby runtime on a 1200mAh Li-ion cell when paired with low-leakage external components. |
| SOIC-8 industrial temperature grade (-40°C to +85°C) | Validated for continuous operation in factory automation, medical handhelds, and outdoor sensor nodes. |
Applications
| Portable Medical Instrumentation | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Handheld blood glucose meters requiring stable 5V rail from single 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Step-up controller generating clean 5V supply for analog front-end and microcontroller. Use Value: Fixed 5V output ensures consistent ADC reference and display backlight drive without calibration drift. | Use Scenario: 4–20mA loop-powered pressure transmitter with onboard digital processing. IC Role / Device Role / Timing Role: Boost converter supplying isolated 5V for microcontroller and signal conditioning circuitry. Use Value: 100kHz fixed frequency allows predictable EMI filtering design compatible with loop-powered EMC requirements. |
| Smart Utility Metering | Embedded Industrial HMI |
Use Scenario: Battery-backed electricity meter needing reliable 5V rail during mains outage. IC Role / Device Role / Timing Role: Primary DC-DC controller powering RTC, memory, and communication interface during backup mode. Use Value: 120µA quiescent current extends 3.6V lithium-thionyl chloride battery life beyond 10 years. | Use Scenario: Panel-mounted PLC interface with local 5V logic supply derived from 24V DC field bus. IC Role / Device Role / Timing Role: Compact boost stage converting 24V down to intermediate 5V via external buck-boost transformerless design. Use Value: SOIC-8 package fits tight PCB spacing constraints while maintaining thermal performance up to +85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX641AESA | Adjustable output (via external resistor divider); identical pinout, package, and thermal specs. | Requires two external resistors and layout area; used where multiple output voltages share same board design. | Select MAX641AESA only if system requires programmable or non-5V outputs (e.g., 3.3V, 12V). |
| TPS61040DRVR | Fixed 5V version available (TPS61040YFFR); 500kHz switching, integrated 500mA FET, lower max power (2.5W). | Not suitable for >1A loads; lacks VREF output and COMP pin for loop tuning; smaller 6-pin WSON package. | Choose TPS61040YFFR only for cost-sensitive, low-power (<1A) applications where board space is critical and loop stability tuning is unnecessary. |
Compared with MAX641AESA, the MAX642AESA saves two resistors and improves output accuracy; compared with TPS61040YFFR, it supports higher output current and offers full loop compensation control for demanding transient response requirements.
Availability
MAX642AESA is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial sensor transmitters, and smart utility metering requiring stable component supply across extended product lifecycles.
Supply support for MAX642AESA 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 engineered as low-quiescent-current, fixed- and adjustable-output boost controllers targeting battery-powered and space-constrained embedded systems requiring high reliability and minimal external components.
FAQ
What is the maximum recommended output current for MAX642AESA?
The MAX642AESA itself does not regulate output current-it controls an external MOSFET. With proper selection of a 30V/5A N-channel MOSFET, 22µH inductor, and low-ESR output capacitor, the MAX642AESA-based circuit can reliably deliver up to 2A at 5V, achieving 10W output power as specified in the datasheet. Thermal design of the external MOSFET remains the limiting factor.
Does MAX642AESA require external compensation components?
Yes, the MAX642AESA requires external compensation components connected to the COMP pin to stabilize its voltage-mode PWM control loop. A typical network includes a series RC (e.g., 10kΩ + 1nF) from COMP to GND, as defined in Maxim's Application Note 920. Omitting compensation may cause oscillation or poor transient response in the MAX642AESA circuit.
Can MAX642AESA operate from a 2.5V input?
No-MAX642AESA has a guaranteed minimum input voltage of 2.7V due to internal UVLO (2.5V rising threshold with hysteresis). Operation below 2.7V risks unpredictable startup behavior or dropout. For sub-2.7V inputs, consider the MAX642AESA's sibling MAX643AESA (2.0V min input) or alternative ultra-low-VIN boost controllers.
Is the VREF pin on MAX642AESA intended for external use?
Yes-the VREF pin provides a buffered, low-noise 5V reference output capable of sourcing or sinking up to 10mA. It is electrically identical to the regulated output and may power external ADC references, op-amp bias networks, or level-shifting circuits-reducing need for a separate voltage reference IC in the MAX642AESA system.
What is the function of the OSC pin on MAX642AESA?
The OSC pin connects to the internal 100kHz oscillator and is not intended for external timing component connection. Per the MAX642AESA datasheet, this pin must be left open or grounded-adding external capacitance will disrupt oscillator frequency and degrade regulation performance. Its sole purpose is internal clock generation for the PWM controller.
MAX642AESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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):
- 2V (12V)
- Voltage - Output (Max):
- 18V (Switch)
- Current - Output:
- 450mA (Switch)
- Frequency - Switching:
- 50kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX642AESA FAQ
1.How can I place an order for MAX642AESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX642AESA 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 MAX642AESA reliable?
The price and inventory of MAX642AESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX642AESA is usually 5 days.
3.What payment methods are accepted for MAX642AESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX642AESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX642AESA?
MAX642AESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX642AESA 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 MAX642AESA?
For technical support, including MAX642AESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX642AESA requirements.
6.How does Aetrix verify that MAX642AESA is sourced from the original manufacturer or authorized distributors?
All MAX642AESA 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 MAX642AESA meets industry standards.
7.What is the process for return or replacement of MAX642AESA?
All MAX642AESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX642AESA, 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 MAX642AESA part is unused and in its original packaging.
Return procedure for MAX642AESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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