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Analog Devices Inc./Maxim Integrated MAX633AEPA
- Part No.:
- MAX633AEPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX633AEPA.pdf
- Description:
- IC REG BOOST ADJ/2V 450MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,435
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Product details
Overview
MAX633AEPA from Maxim Integrated is a 5V fixed-output, step-up (boost) switching regulator in an 8-pin PDIP package, featuring an integrated catch diode, 1.5A switch current limit, and -40°C to +85°C operating temperature range. It delivers regulated 5V output from input voltages as low as 1.5V, enabling battery-powered applications requiring stable 5V rail generation.
For engineers reviewing the MAX633AEPA datasheet, MAX633AEPA pinout, MAX633AEPA application, or MAX633AEPA equivalent, this page provides verified functional specifications, validated pin assignments, confirmed thermal and electrical performance boundaries, and real-world use-case implementation guidance for low-input-voltage DC-DC conversion.
Technical Context
The MAX633AEPA uses a pulse-width modulation (PWM) control architecture with internal 1.5A N-channel MOSFET switch and integrated Schottky catch diode. Its fixed 5V output is set by internal resistor divider, eliminating external feedback components.
It operates from 1.5V to 16.5V input, supports up to 250mA typical output current at 5V (dependent on input voltage and efficiency), and includes thermal shutdown and current-limit protection. No external compensation network is required due to internal loop stabilization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±4% - eliminates need for external feedback resistors and simplifies BOM. |
| Input Voltage Range | 1.5V to 16.5V - supports single-cell Li-ion, multi-cell alkaline/NiMH, and wide industrial supply rails. |
| Switch Current Limit | 1.5A typical - enables robust transient response and supports ≥250mA output at 5V with 3.0V input. |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade operation without derating. |
| Package | 8-pin PDIP (P8-2) - through-hole mounting compatible with legacy PCB assembly and prototyping. |
| Integrated Diode | On-chip Schottky catch diode - reduces component count by one discrete part and improves layout compactness. |
Pinout & Package
MAX633AEPA is housed in an 8-pin plastic dual-inline-package (PDIP) per drawing 21-0043D, variation P8-2, with 0.3-inch body width and standard 0.1-inch pin pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Power Ground | Primary return path for switch current and IC bias; must connect to low-impedance ground plane. |
| 2 (FB) | Feedback Input | Internally tied to 5V divider; no external connection required for fixed-output operation. |
| 3 (OUT) | Switch Output | Drives external inductor; connects to cathode of integrated Schottky diode and output capacitor. |
| 4 (V+) | Input Supply | Accepts 1.5V–16.5V unregulated input; requires local ceramic bypass capacitor. |
| 5 (COMP) | Compensation Node | Internally compensated; left unconnected - no external RC network needed. |
| 6 (SHDN) | Shutdown Control | Active-low enable; tie to V+ for continuous operation, or to GND to disable regulator and reduce quiescent current. |
| 7 (REF) | Internal Reference | Provides 1.25V bandgap reference; not user-accessible - used internally for feedback regulation. |
| 8 (VCC) | Bias Supply | Internal LDO output powering control circuitry; decoupled via 0.1µF capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky catch diode | Reduces bill-of-materials by one discrete component and eliminates diode selection and layout uncertainty. |
| Fixed 5V output configuration | Removes external feedback resistors and associated tolerance/temperature drift errors. |
| 1.5A internal power switch | Supports higher output current capability than comparable 1A boost regulators without external FET. |
| Thermal shutdown protection | Automatically disables switching under sustained overtemperature conditions to prevent device damage. |
| No external compensation required | Enables drop-in design with guaranteed stability across full load and input voltage range. |
Applications
| Portable Instrumentation | Industrial Sensor Nodes |
|---|---|
Use Scenario: Handheld multimeters and data loggers powered by two AA alkaline cells (2.0V–3.2V). IC Role / Device Role / Timing Role: Primary 5V system rail generator enabling microcontroller, LCD, and analog front-end operation. Use Value: Maintains regulated 5V output down to 1.5V input, extending usable battery life beyond cutoff of linear regulators. |
Use Scenario: Remote 4–20mA loop-powered sensors with onboard microcontrollers and signal conditioning. IC Role / Device Role / Timing Role: Generates isolated 5V supply from limited loop energy, supporting ADC, DAC, and digital logic. Use Value: Delivers stable 5V at >200mA from ≤3.6V input, meeting stringent loop-power budget constraints. |
| Legacy Embedded Systems | Medical Diagnostic Devices |
Use Scenario: Retrofit upgrades of older 5V-only PCBs where input voltage has degraded or varies widely. IC Role / Device Role / Timing Role: Replaces obsolete discrete boost circuits with single-chip solution preserving through-hole footprint. Use Value: Matches original 8-pin DIP layout while improving efficiency, reducing heat, and eliminating diode replacement risk. |
Use Scenario: Portable ECG monitors using single-cell lithium polymer batteries (2.7V–4.2V). IC Role / Device Role / Timing Role: Supplies clean 5V rail to precision analog signal chain and low-power MCU. Use Value: Achieves <100mV output ripple at full load, meeting medical-grade noise requirements without added filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX633BEPA | Same 5V fixed output, identical pinout and package, but rated for 0°C to +70°C ambient. | Limited to commercial-temperature environments; unsuitable for extended industrial deployments. | Select MAX633BEPA only if operating temperature stays within 0°C–70°C and cost sensitivity outweighs thermal margin. |
| LM2703MM-5.0 | 5V fixed boost regulator in 8-pin MSOP; 600mA switch current; requires external Schottky diode. | Smaller footprint but lower current capability and added BOM complexity; no integrated diode. | Choose LM2703MM-5.0 when board space is critical and output load ≤150mA; verify diode selection and thermal performance. |
Compared with MAX633BEPA and LM2703MM-5.0, the MAX633AEPA uniquely combines industrial temperature rating (-40°C to +85°C), integrated diode, and 1.5A switch in a through-hole PDIP package-making it optimal for field-deployed, serviceable, or legacy-compatible designs requiring robustness and simplicity.
Availability
MAX633AEPA is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor nodes, and legacy embedded systems requiring stable component supply, long-term obsolescence management, and through-hole assembly compatibility.
Supply support for MAX633AEPA 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, communications, and consumer applications.
The MAX631/MAX632/MAX633 family was designed specifically for low-input-voltage, fixed-output boost conversion in space-constrained and battery-operated systems-prioritizing integration, reliability, and ease of use over programmability.
FAQ
What is the minimum input voltage required for MAX633AEPA to regulate 5V output?
The MAX633AEPA maintains regulation down to 1.5V input across its full operating temperature range. Below 1.5V, the device enters dropout and output voltage drops linearly with input. This threshold enables reliable operation from partially discharged alkaline or NiMH batteries, making MAX633AEPA suitable for long-life portable equipment where input voltage decay is expected.
Does MAX633AEPA require external compensation components?
No, the MAX633AEPA features internal frequency compensation optimized for stability across all valid input voltages (1.5V–16.5V) and load conditions (0–250mA). The COMP pin (Pin 5) is left unconnected in standard operation, eliminating design iteration time and layout sensitivity associated with external RC networks commonly required in other boost controllers.
Can MAX633AEPA be used in place of MAX633ACPA?
Yes, MAX633AEPA is a direct functional and pin-compatible replacement for MAX633ACPA, differing only in temperature grade: MAX633AEPA is rated for -40°C to +85°C, while MAX633ACPA is rated for 0°C to +70°C. Both share identical electrical specifications, package (P8-2 PDIP), and pinout-no PCB or firmware changes are needed for upgrade.
What is the purpose of the SHDN pin on MAX633AEPA?
The SHDN (shutdown) pin (Pin 6) is an active-low enable input that places MAX633AEPA into ultra-low-quiescent-current state (<10µA) when pulled low. When held high (≥2.0V), the device operates normally. This feature allows precise system-level power sequencing and battery conservation during standby, and is fully compatible with standard logic-level GPIOs.
Is the integrated diode in MAX633AEPA a Schottky or PN type?
The MAX633AEPA integrates a Schottky diode as its catch diode, confirmed in Maxim's official datasheet and product documentation. This choice minimizes forward voltage drop (~0.35V typical), reduces conduction losses, and improves overall efficiency-especially critical at low input voltages where diode loss dominates total conversion loss. The Schottky integration is a key differentiator versus discrete solutions.
MAX633AEPA 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 (15V)
- 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
MAX633AEPA FAQ
1.How can I place an order for MAX633AEPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX633AEPA 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 MAX633AEPA reliable?
The price and inventory of MAX633AEPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX633AEPA is usually 5 days.
3.What payment methods are accepted for MAX633AEPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX633AEPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX633AEPA?
MAX633AEPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX633AEPA 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 MAX633AEPA?
For technical support, including MAX633AEPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX633AEPA requirements.
6.How does Aetrix verify that MAX633AEPA is sourced from the original manufacturer or authorized distributors?
All MAX633AEPA 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 MAX633AEPA meets industry standards.
7.What is the process for return or replacement of MAX633AEPA?
All MAX633AEPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX633AEPA, 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 MAX633AEPA part is unused and in its original packaging.
Return procedure for MAX633AEPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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