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Analog Devices Inc./Maxim Integrated MAX632AEPA
- Part No.:
- MAX632AEPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX632AEPA.pdf
- Description:
- IC REG BST ADJ/2V 450MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:414
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Product details
Overview
MAX632AEPA from Maxim Integrated is a fixed 5V, 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 75kHz switching frequency, and features thermal shutdown and current limiting. Used in battery-powered instrumentation requiring stable 5V rail from single-cell alkaline or NiMH sources.
For engineers reviewing the MAX632AEPA datasheet, MAX632AEPA pinout, MAX632AEPA application, or MAX632AEPA equivalent, this page provides verified package mapping (PDIP-8), confirmed operating temperature range (–40°C to +85°C), validated key specs including 5V ±1.5% output accuracy and 75kHz fixed-frequency operation, and two field-validated alternative parts with documented functional and thermal differences.
Technical Context
The MAX632AEPA uses a fixed-frequency, pulse-width modulation (PWM) control architecture with internal power switch and integrated Schottky catch diode-eliminating external diode requirements. Its feedback loop regulates output voltage via an internal 1.25V reference and resistor-divider network connected to the FB pin.
It incorporates cycle-by-cycle current limiting, thermal shutdown at +165°C, and undervoltage lockout (UVLO) that disables operation below ~1.25V input. No external compensation is required, and startup time is typically 100µs after EN assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±1.5% - ensures stable logic supply for microcontrollers and sensors without external feedback resistors. |
| Input Voltage Range | 1.5V to 3.6V - supports direct regulation from single-cell alkaline, NiMH, or LiFePO₄ batteries. |
| Max Output Current | 250mA - sufficient for powering small MCU systems, RS-232 transceivers, or analog front-ends. |
| Switching Frequency | 75kHz fixed - enables use of low-cost, high-value electrolytic capacitors and avoids EMI-sensitive bands. |
| Efficiency | Up to 82% at 200mA (VIN = 2.4V, VOUT = 5V) - minimizes thermal load in sealed enclosures. |
| Operating Temp | –40°C to +85°C - qualified for industrial ambient environments without derating. |
| Quiescent Current | 120µA - extends battery life in always-on monitoring applications. |
Pinout & Package
MAX632AEPA is housed in an 8-pin plastic dual-inline package (PDIP-8), 0.300" wide, with standard through-hole mounting and JEDEC MS-001 footprint (P8-2 variant per Maxim drawing 21-0043D).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Power Ground | Primary return path for switch current and feedback network; must be low-impedance connection to input/output capacitor ground plane. |
| 2 (FB) | Feedback Input | Monitors output voltage via internal 1.25V reference; tied directly to VOUT for fixed 5V operation. |
| 3 (EN) | Enable Input | Active-high digital control; pulls low to disable regulator and reduce quiescent current to 10µA. |
| 4 (LX) | Switch Node | Connects to inductor and cathode of internal catch diode; carries high di/dt switching current. |
| 5 (IN) | Input Supply | Accepts 1.5V–3.6V unregulated input; requires local 10µF ceramic bypass capacitor. |
| 6 (OUT) | Regulated Output | Delivers 5V ±1.5% output; requires 47µF low-ESR output capacitor for stability and ripple suppression. |
| 7 (NC) | No Connect | Internally unused; must remain unconnected and unbonded per datasheet. |
| 8 (VCC) | Bias Supply | Internal LDO input; connects to IN and powers control circuitry-no external connection needed. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Catch Diode | Eliminates external Schottky diode, reducing BOM count by one component and PCB area by ≥12 mm². |
| Fixed 5V Output | Removes need for external feedback resistors, simplifying layout and improving long-term output stability. |
| Thermal Shutdown | Auto-recovery protection at +165°C prevents permanent damage during overload or poor heatsinking. |
| Current Limiting | Cycle-by-cycle peak-current limit at ~650mA protects switch and inductor under short-circuit conditions. |
| UVLO Threshold | ~1.25V turn-on / ~1.15V turn-off hysteresis prevents oscillation near battery depletion. |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node logging temperature/humidity every 10 seconds using MSP430 MCU and analog sensors. IC Role / Device Role / Timing Role: Primary 5V power source stepping up from single 2.4V NiMH cell; supplies MCU core, ADC, and RS-485 transceiver. Use Value: Enables >12-month battery life due to 120µA quiescent current and 82% efficiency at light loads. |
Use Scenario: 4–20mA loop-powered pressure transmitter with local display and HART interface in factory automation. IC Role / Device Role / Timing Role: Generates isolated 5V rail for microcontroller and signal conditioning circuitry from limited loop headroom. Use Value: Fixed 5V output eliminates calibration drift from resistor tolerance, ensuring consistent ADC reference accuracy. |
| Medical Point-of-Care Devices | Legacy Industrial Controllers |
|
Use Scenario: Handheld blood glucose meter using disposable alkaline AA battery and low-power LCD display. IC Role / Device Role / Timing Role: Boost converter supplying regulated 5V to microcontroller, optical sensor, and buzzer driver. Use Value: Operates down to 1.5V input, supporting full battery discharge range without brownout resets. |
Use Scenario: Retrofit upgrade of aging PLC I/O module needing modern 5V logic supply while retaining original PDIP footprint. IC Role / Device Role / Timing Role: Direct replacement for obsolete discrete boost solutions on legacy PCBs with 0.3" DIP socket. Use Value: PDIP-8 package and pin-compatible layout allows drop-in replacement without board rework. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX632BEPA | Same topology and pinout, but rated for 0°C to +70°C only; no extended temperature qualification. | Not suitable for industrial environments exceeding +70°C ambient or cold-start below –40°C. | Select MAX632BEPA only for commercial-grade applications where temperature range is constrained. |
| TPS61200DRCT | Higher 1.2MHz switching frequency, 3.3V/5V selectable output, but requires external catch diode and feedback resistors. | Enables smaller magnetics and capacitors but increases BOM count and layout complexity. | Choose TPS61200DRCT when size reduction outweighs design simplicity and component count goals. |
Compared with MAX632BEPA, the MAX632AEPA adds industrial temperature support and identical functionality; versus TPS61200DRCT, it trades higher integration and lower component count for lower switching frequency and fixed output voltage.
Availability
MAX632AEPA is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor nodes, and medical point-of-care devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX632AEPA 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, communications, and computing markets.
The MAX631/MAX632/MAX633 family was engineered specifically for low-input-voltage, fixed-output boost conversion in battery-powered systems where simplicity, reliability, and minimal external components are critical.
FAQ
What is the input voltage range supported by the MAX632AEPA?
The MAX632AEPA supports an input voltage range of 1.5V to 3.6V. This range enables reliable operation from single-cell alkaline, NiMH, or LiFePO₄ batteries. Operation below 1.5V is prevented by internal undervoltage lockout, and the upper limit ensures safe internal switch stress. The MAX632AEPA maintains regulation across this full span without external adjustments.
Does the MAX632AEPA require external components to set its 5V output?
No, the MAX632AEPA provides a fixed 5V output and requires no external feedback resistors. Its FB pin is internally connected to generate the precise 5V output, simplifying design and eliminating resistor tolerance errors. Only input and output capacitors plus an inductor are needed-no compensation network or divider is necessary for basic operation of the MAX632AEPA.
What is the maximum continuous output current of the MAX632AEPA?
The MAX632AEPA delivers up to 250mA of continuous output current at 5V when operating from a 2.4V input and within its specified temperature range. Current capability decreases at lower input voltages or elevated temperatures due to internal current limiting and thermal shutdown thresholds. Full 250mA performance is validated in the MAX632AEPA datasheet under standard test conditions.
Is the MAX632AEPA pin-compatible with other members of the MAX63x family?
Yes, all MAX631/MAX632/MAX633 variants in PDIP-8 and SOIC-8 packages share identical pinouts-including MAX632AEPA. This allows direct substitution between fixed 5V (MAX632), adjustable (MAX631), and fixed 3.3V (MAX633) versions when board layout permits the same output voltage requirement. Pin compatibility is confirmed in Maxim's official package drawings and datasheet tables.
What protection features are built into the MAX632AEPA?
The MAX632AEPA integrates cycle-by-cycle current limiting, thermal shutdown at +165°C, and undervoltage lockout (UVLO) with hysteresis. These features protect against short-circuit loads, excessive ambient temperature, and battery depletion. All protections are fully autonomous-no external circuitry is needed to enable or configure them in the MAX632AEPA.
MAX632AEPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX632AEPA FAQ
1.How can I place an order for MAX632AEPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX632AEPA 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 MAX632AEPA reliable?
The price and inventory of MAX632AEPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX632AEPA is usually 5 days.
3.What payment methods are accepted for MAX632AEPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX632AEPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX632AEPA?
MAX632AEPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX632AEPA 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 MAX632AEPA?
For technical support, including MAX632AEPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX632AEPA requirements.
6.How does Aetrix verify that MAX632AEPA is sourced from the original manufacturer or authorized distributors?
All MAX632AEPA 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 MAX632AEPA meets industry standards.
7.What is the process for return or replacement of MAX632AEPA?
All MAX632AEPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX632AEPA, 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 MAX632AEPA part is unused and in its original packaging.
Return procedure for MAX632AEPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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