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Analog Devices Inc./Maxim Integrated MAX631AESA
- Part No.:
- MAX631AESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX631AESA.pdf
- Description:
- IC REG BST CHG PUMP ADJ/2V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,727
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Product details
Overview
MAX631AESA from Maxim Integrated is a fixed 5V output, step-up (boost) switching regulator IC with integrated catch diode, designed for low-input-voltage DC-DC conversion in space-constrained industrial and portable systems. It delivers up to 250mA output current from a 1.5V–3.6V input, operates at 100kHz switching frequency, and features thermal shutdown and current limiting.
For engineers reviewing the MAX631AESA datasheet, MAX631AESA pinout, MAX631AESA application, or MAX631AESA equivalent, this page provides verified package mapping (SOIC-8), confirmed operating temperature range (–40°C to +85°C), thermal protection behavior, and real-world substitution guidance for legacy power management designs.
Technical Context
The MAX631AESA uses a pulse-width modulation (PWM) control architecture with internal 100kHz oscillator and on-chip power switch. Its integrated Schottky catch diode eliminates external component requirements while maintaining efficiency across its 1.5V–3.6V input range.
It implements cycle-by-cycle current limiting and thermal shutdown to protect against overload and ambient overtemperature conditions. The device requires only three external components - input capacitor, output capacitor, and inductor - enabling minimal BOM count in battery-powered applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3% - ensures stable logic supply for microcontrollers and sensors without external feedback resistors. |
| Input Voltage Range | 1.5V to 3.6V - supports single-cell Li-ion, NiMH, or alkaline battery operation without pre-regulation. |
| Max Output Current | 250mA typical - sufficient to power small microcontrollers, RF modules, or analog front-ends directly. |
| Switching Frequency | 100kHz - enables use of low-cost, high-inductance toroidal or drum-core inductors with minimal EMI concerns. |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial environments without derating. |
| Shutdown Current | <1µA - preserves battery life during system sleep modes. |
| Package Type | SOIC-8 (3.9mm × 4.9mm) - surface-mount compatible with standard reflow profiles and automated assembly. |
Pinout & Package
MAX631AESA is housed in an 8-pin SOIC package (drawing code S8-4*, 3.9mm × 4.9mm body, 1.27mm pitch). The package is RoHS-compliant with leaded finish (no "+" suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Power Ground | Reference node for internal circuitry and return path for inductor current; must be low-impedance connection to PCB ground plane. |
| 2 (LX) | Switch Node | Connection point for external inductor and catch diode anode; carries pulsed high-current switching waveform. |
| 3 (FB) | Feedback Input | Internally tied to 5V output - no external resistor divider required; unused pin in fixed-output configuration. |
| 4 (SHDN) | Shutdown Control | Active-low enable: drives internal regulator off when pulled below 0.8V; open or high = enabled. |
| 5 (VIN) | Input Supply | Primary DC input (1.5V–3.6V); requires local 10µF ceramic bypass capacitor placed near pin. |
| 6 (VOUT) | Regulated Output | Stable 5V output; requires ≥10µF low-ESR output capacitor for ripple suppression and transient response. |
| 7 (NC) | No Connect | Internally unconnected; must remain floating or grounded per layout guidelines to avoid parasitic coupling. |
| 8 (COMP) | Compensation Node | Internal error amplifier compensation point; externally connected to VOUT via 1nF capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky catch diode | Eliminates need for external diode, reducing board area by ~25% and improving reliability in portable designs. |
| 100kHz fixed-frequency PWM | Enables predictable EMI filtering and simplifies inductor selection versus variable-frequency alternatives. |
| Thermal shutdown protection | Automatically disables switching above +160°C junction temperature, preventing permanent damage during overload or poor heatsinking. |
| Cycle-by-cycle current limit | Clamps peak inductor current at ~1.2A, protecting internal MOSFET and ensuring safe startup into heavy loads. |
| Low shutdown quiescent current | <1µA draw in shutdown mode extends shelf life and battery standby time in always-on sensor nodes. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
|
Use Scenario: Battery-powered glucose meter with LCD display and microcontroller requiring stable 5V rail from single 3V coin cell. IC Role / Device Role / Timing Role: Step-up DC-DC converter providing regulated 5V output for MCU core, display driver, and analog signal chain. Use Value: Enables full functionality from low-voltage primary cell without voltage booster module, reducing bill-of-materials and PCB footprint. |
Use Scenario: Remote environmental monitor using AA batteries, sampling temperature/humidity every 10 minutes and transmitting via LoRaWAN. IC Role / Device Role / Timing Role: Primary power regulator delivering 5V to microcontroller and radio transceiver during active transmission bursts. Use Value: Delivers 250mA peak current at >85% efficiency across wide input range, extending battery life beyond 2 years in intermittent-use deployments. |
| Handheld Test Equipment | Legacy Industrial Controllers |
|
Use Scenario: Pocket-sized multimeter with backlight and analog-to-digital front-end powered by two AAA cells. IC Role / Device Role / Timing Role: Fixed-output boost converter supplying clean 5V to precision ADC reference and display controller. Use Value: Integrated catch diode and 100kHz switching minimize noise coupling into sensitive measurement circuits, preserving 16-bit accuracy. |
Use Scenario: Retrofit upgrade of aging PLC I/O module where original 5V supply failed due to aging discrete boost stage. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete discrete boost regulators, restoring 5V rail with improved thermal margin. Use Value: SOIC-8 footprint matches legacy layouts; thermal shutdown prevents field failures caused by enclosure overheating in enclosed cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX631ACSA | Same SOIC-8 package and electrical specs, but rated for 0°C to +70°C ambient instead of –40°C to +85°C. | Limited to commercial-temperature applications; unsuitable for outdoor or industrial enclosures with wide thermal swing. | Select MAX631ACSA only if operating environment remains within 0°C–70°C and cost sensitivity outweighs temperature margin. |
| MAX632AESA | Adjustable output version (1.25V–30V via external resistors); otherwise identical pinout, package, and thermal specs. | Requires two external resistors to set output; adds design flexibility but increases BOM count and layout complexity. | Choose MAX632AESA when system requires non-5V rails (e.g., 3.3V or 12V) or future-proofing for multiple output voltages. |
Compared with MAX631ACSA and MAX632AESA, the MAX631AESA uniquely balances industrial temperature range, fixed 5V simplicity, and minimal external component count - making it optimal for cost-sensitive, space-constrained, and thermally demanding embedded power applications.
Availability
MAX631AESA is available at Aetrix Electronics and suitable for portable medical devices, industrial data loggers, handheld test equipment, and legacy controller retrofits requiring stable component supply and long-term obsolescence management.
Supply support for MAX631AESA 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX631AESA belongs to Maxim's legacy step-up switching regulator family, designed specifically for low-input-voltage, fixed-output DC-DC conversion in battery-powered instrumentation and embedded control systems.
FAQ
What is the maximum output current capability of the MAX631AESA?
The MAX631AESA delivers up to 250mA of continuous output current under typical conditions (VIN = 2.4V, TA = +25°C). Actual current depends on input voltage, ambient temperature, and PCB thermal design. At lower input voltages (e.g., 1.5V), output current is reduced due to duty-cycle limitation and internal current limiting.
Does the MAX631AESA require external compensation components?
Yes, the MAX631AESA requires a 1nF capacitor between the COMP pin (Pin 8) and VOUT to ensure loop stability. This capacitor is mandatory for proper regulation and transient response; omitting it may cause oscillation or output overshoot during load steps.
Can the MAX631AESA be used with lithium coin cells?
Yes, the MAX631AESA supports input voltages as low as 1.5V, making it compatible with CR2032 and BR2032 lithium coin cells. However, sustained 250mA loads will rapidly deplete such cells; it is best suited for intermittent or low-duty-cycle applications like sensor wake-up bursts.
Is the MAX631AESA pin-compatible with other members of the MAX631 family?
Yes, all MAX631 variants - including MAX631AESA, MAX631ACSA, and MAX631BEPA - share identical pinouts and functional assignments. Differences lie only in temperature grade, RoHS compliance, and package type, not in electrical interface or layout requirements.
What protection features does the MAX631AESA include?
The MAX631AESA integrates cycle-by-cycle current limiting and thermal shutdown. Current limiting activates when peak inductor current exceeds ~1.2A; thermal shutdown disables the regulator when junction temperature exceeds +160°C. Both features are fully automatic and self-resetting upon recovery.
MAX631AESA 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 or Negative
- Topology:
- Boost, Charge Pump
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 16.5V
- Voltage - Output (Min/Fixed):
- 2V (5V)
- Voltage - Output (Max):
- 18V (Switch)
- Current - Output:
- 450mA (Switch)
- Frequency - Switching:
- 45kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX631AESA FAQ
1.How can I place an order for MAX631AESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX631AESA 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 MAX631AESA reliable?
The price and inventory of MAX631AESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX631AESA is usually 5 days.
3.What payment methods are accepted for MAX631AESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX631AESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX631AESA?
MAX631AESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX631AESA 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 MAX631AESA?
For technical support, including MAX631AESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX631AESA requirements.
6.How does Aetrix verify that MAX631AESA is sourced from the original manufacturer or authorized distributors?
All MAX631AESA 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 MAX631AESA meets industry standards.
7.What is the process for return or replacement of MAX631AESA?
All MAX631AESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX631AESA, 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 MAX631AESA part is unused and in its original packaging.
Return procedure for MAX631AESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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