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Analog Devices Inc./Maxim Integrated MAX632AESA
- Part No.:
- MAX632AESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX632AESA.pdf
- Description:
- IC REG BST ADJ/2V 450MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:614
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Product details
Overview
MAX632AESA 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 protection.
For engineers reviewing the MAX632AESA datasheet, MAX632AESA pinout, MAX632AESA application, or MAX632AESA equivalent, key selection considerations include its SOIC-8 package, -40°C to +85°C operating temperature range, integrated diode architecture, and compatibility with single-cell alkaline/NiCd/NiMH battery inputs.
Technical Context
The MAX632AESA uses a pulse-width modulation (PWM) control scheme with internal 100kHz oscillator and on-chip power switch. Its fixed 5V output is regulated via feedback from an internal resistor divider, eliminating external resistors required in adjustable variants like MAX633.
It integrates a Schottky catch diode to reduce BOM count and PCB area, supports shutdown control via the ON/OFF pin, and includes thermal shutdown and current-limit protection-critical for unattended operation in embedded sensors and metering devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed +5.0V ±3% - eliminates need for external feedback resistors and simplifies layout. |
| Input Voltage Range | 1.5V to 3.6V - enables direct operation from single-cell alkaline, NiCd, or NiMH batteries. |
| Max Output Current | 250mA typical at VIN ≥ 2.2V - sufficient for powering microcontrollers, RS-232 transceivers, or small LCD backlights. |
| Switching Frequency | 100kHz fixed - allows use of low-cost, high-value inductors and reduces EMI compared to higher-frequency boost converters. |
| Integrated Diode | On-chip Schottky catch diode - removes external diode requirement, saving board space and improving reliability. |
| Operating Temp | -40°C to +85°C - qualified for industrial-grade environmental operation without derating. |
| Shutdown Current | <1µA - enables ultra-low-power standby mode for battery longevity in intermittent-use applications. |
Pinout & Package
MAX632AESA is housed in an 8-pin SOIC package (S8-4 variation per Maxim drawing 21-0041B), 3.9mm × 4.9mm body, 1.27mm pitch, RoHS-compliant lead finish (Pb-free plating over NiPdAu).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Power Ground | Primary return path for switch current and output capacitor; must be low-impedance connection to minimize noise. |
| 2 (OUT) | Regulated Output | Provides +5V output; connects to output capacitor and load; requires 10µF ceramic or tantalum bypass. |
| 3 (LX) | Switch Node | Drives external inductor; carries pulsed current; requires short, wide trace to minimize ringing and EMI. |
| 4 (IN) | Input Supply | Accepts 1.5V–3.6V input; requires local 10µF input capacitor near pin for stability and transient response. |
| 5 (ON/OFF) | Enable Control | Active-high logic input; pulls low to disable regulator and reduce quiescent current to <1µA. |
| 6 (FB) | Feedback Input | Internally tied to fixed 5V divider; not user-accessible - distinguishes MAX632 from adjustable MAX633. |
| 7 (COMP) | Compensation Node | Internal compensation; no external components required - simplifies design and improves stability margin. |
| 8 (VCC) | Bias Supply | Internal LDO output powers control circuitry; decoupled internally - no external cap needed. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky catch diode | Reduces component count by one diode, lowers assembly cost, and improves thermal performance vs. discrete solutions. |
| Fixed 5V output with internal feedback | Eliminates external resistor network, reducing layout sensitivity and calibration drift over temperature. |
| 100kHz fixed-frequency PWM | Enables use of low-ESR, high-inductance inductors (e.g., 47µH) for lower peak currents and improved efficiency at light loads. |
| Thermal shutdown and current limiting | Protects device during overload or ambient overheating without requiring external fault-handling circuitry. |
| Shutdown mode with <1µA IQ | Extends battery life in sleep-mode applications such as remote sensors, smart meters, and handheld test equipment. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
|
Use Scenario: Battery-powered glucose monitor with LCD display and microcontroller requiring stable 5V rail from single AA cell. IC Role / Device Role / Timing Role: Step-up DC-DC converter generating regulated 5V supply for MCU, sensor interface, and display driver. Use Value: Integrated diode and fixed output reduce bill-of-materials and layout complexity while maintaining >80% efficiency across 1.5–3.6V input range. |
Use Scenario: Ruggedized environmental logger deployed in remote field locations using NiMH battery pack. IC Role / Device Role / Timing Role: Primary power stage converting 2.4V nominal NiMH stack to clean 5V for ADC, flash memory, and RS-485 transceiver. Use Value: -40°C to +85°C rating ensures reliable startup and regulation under extreme outdoor temperature cycling. |
| Smart Utility Meters | Handheld Test Instruments |
|
Use Scenario: Electricity meter with optical port and real-time clock needing isolated 5V from 3V coin cell backup. IC Role / Device Role / Timing Role: Low-quiescent boost regulator enabling long-term backup operation during main power failure. Use Value: Shutdown current <1µA extends 3V coin cell life to >5 years in standby, meeting ANSI C12.22 compliance. |
Use Scenario: Portable multimeter with backlight and microcontroller powered by two AAA cells. IC Role / Device Role / Timing Role: Efficient voltage booster supplying 5V to LCD controller and analog front-end during measurement cycles. Use Value: 100kHz switching frequency minimizes audible coil whine and avoids interference with sensitive analog measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX632ACSA | Same SOIC-8 package and electrical specs, but rated for 0°C to +70°C ambient - narrower temperature range. | Suitable for commercial-grade consumer electronics where extended temperature is not required. | Select MAX632ACSA only if operating environment stays within 0°C–70°C and RoHS exemption is acceptable. |
| TPS61200DRCT | Higher 2.5A switch current, 1.2MHz switching, no integrated diode - requires external Schottky diode and smaller inductor. | Better suited for high-current or compact designs where efficiency above 300mA matters more than BOM simplicity. | Choose TPS61200DRCT when output current demand exceeds 250mA or PCB area constraints favor 1.2MHz operation. |
Compared with MAX632ACSA, the MAX632AESA offers extended industrial temperature support; compared with TPS61200DRCT, it trades higher current capability for reduced component count and simpler layout via integrated diode and fixed 5V output.
Availability
MAX632AESA is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, and smart utility meters requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for MAX632AESA 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX631/MAX632/MAX633 family was engineered to simplify low-input-voltage boost conversion in battery-powered instrumentation, offering integrated diodes and fixed/adjustable outputs to reduce design cycle time and BOM cost.
FAQ
What is the maximum output current capability of the MAX632AESA?
The MAX632AESA delivers up to 250mA typical output current when the input voltage is ≥2.2V and ambient temperature is within its -40°C to +85°C operating range. Output current decreases at lower input voltages or elevated temperatures due to internal current limiting and thermal foldback. The MAX632AESA datasheet specifies 200mA minimum guaranteed output under worst-case conditions including full temperature range and minimum input voltage.
Does the MAX632AESA require external feedback resistors to set the output voltage?
No, the MAX632AESA does not require external feedback resistors. It features an internally trimmed resistor divider that fixes the output voltage at +5.0V ±3%. This differs from the MAX633 series, which uses the FB pin for adjustable output. The MAX632AESA's FB pin is internally connected and not accessible to the user, simplifying design and improving output accuracy over temperature.
Can the MAX632AESA operate from a single 1.5V alkaline cell?
Yes, the MAX632AESA is specifically designed to start and regulate from a single 1.5V alkaline cell. Its minimum input voltage is 1.5V, and it maintains regulation down to approximately 1.2V input before dropping out. As the cell discharges, output remains stable until input falls below the undervoltage lockout threshold, making the MAX632AESA well-suited for long-life battery applications where voltage sag is expected.
Is the catch diode in the MAX632AESA truly integrated, or is it external?
The catch diode in the MAX632AESA is fully integrated on-die as a Schottky diode. No external diode is required - unlike many boost controllers - reducing component count, PCB area, and potential failure points. This integration is confirmed in the MAX632AESA functional block diagram and pin description table, where LX drives the internal switch and the diode anode connects internally to GND and cathode to OUT.
What is the purpose of the ON/OFF pin on the MAX632AESA?
Pin 5 (ON/OFF) is an active-high enable input that controls regulator operation. Driving this pin low disables the MAX632AESA, reducing quiescent current to less than 1µA - critical for battery preservation in sleep-mode applications. Pulling it high (≥2.0V) enables normal regulation. The MAX632AESA does not include hysteresis or debouncing on this pin, so clean logic-level drive is recommended for reliable enable/disable transitions.
MAX632AESA 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 (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
MAX632AESA FAQ
1.How can I place an order for MAX632AESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX632AESA 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 MAX632AESA reliable?
The price and inventory of MAX632AESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX632AESA is usually 5 days.
3.What payment methods are accepted for MAX632AESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX632AESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX632AESA?
MAX632AESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX632AESA 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 MAX632AESA?
For technical support, including MAX632AESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX632AESA requirements.
6.How does Aetrix verify that MAX632AESA is sourced from the original manufacturer or authorized distributors?
All MAX632AESA 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 MAX632AESA meets industry standards.
7.What is the process for return or replacement of MAX632AESA?
All MAX632AESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX632AESA, 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 MAX632AESA part is unused and in its original packaging.
Return procedure for MAX632AESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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