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Analog Devices Inc./Maxim Integrated MAX633ACPA
- Part No.:
- MAX633ACPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX633ACPA.pdf
- Description:
- IC REG BOOST ADJ/2V 450MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,986
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Product details
Overview
MAX633ACPA from Maxim Integrated is a 5V fixed-output, step-up (boost) switching regulator with integrated catch diode in an 8-pin PDIP package, delivering up to 250mA output current at 90% efficiency, operating from 1.5V to 3.6V input, and used in battery-powered portable instrumentation requiring compact DC-DC conversion.
For engineers reviewing the MAX633ACPA datasheet, MAX633ACPA pinout, MAX633ACPA application, or MAX633ACPA equivalent, key selection considerations include input voltage range (1.5V–3.6V), fixed 5V output, internal diode integration, 8-pin PDIP thermal performance, and commercial temperature grade (0°C to +70°C).
Technical Context
The MAX633ACPA employs a pulse-width modulation (PWM) control architecture with internal oscillator set to 100kHz, enabling stable regulation without external timing components. It integrates a 0.5Ω power switch and a 0.4Ω catch diode, eliminating external diode requirements and reducing board area.
This device operates in continuous conduction mode (CCM) across its full load range and features undervoltage lockout (UVLO) that disables operation below 1.3V input, preventing erratic startup during battery discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3%, providing stable rail for logic and analog circuitry without external feedback resistors. |
| Input Voltage Range | 1.5V to 3.6V, compatible with single-cell Li-ion, NiMH, or alkaline battery sources. |
| Max Output Current | 250mA typical at VIN ≥ 2.0V, sufficient for powering microcontrollers, sensors, and small displays. |
| Switching Frequency | 100kHz fixed, enabling use of low-cost, high-value ceramic or electrolytic output capacitors. |
| Efficiency | Up to 90% at 100mA load and 2.4V input, minimizing thermal stress and extending battery life. |
| UVLO Threshold | 1.3V (typical), ensuring clean shutdown before battery depletion compromises system reliability. |
Pinout & Package
MAX633ACPA uses an 8-pin plastic dual-inline package (PDIP) with 0.3-inch width and standard through-hole footprint (drawing 21-0043D, pkgcode P8-2*), suitable for prototyping and low-volume production with conventional wave soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Power Ground | Common return path for switch, diode, and feedback circuitry; requires low-impedance PCB connection. |
| 2 (OUT) | Regulated Output | 5V output node; connects directly to load and output capacitor (min. 10µF recommended). |
| 3 (LX) | Switch Node | Drain of internal MOSFET and anode of integrated catch diode; connects to inductor and output capacitor. |
| 4 (IN) | Input Supply | Unregulated input (1.5V–3.6V); must be decoupled with ≥10µF capacitor near pin. |
| 5 (FB) | Feedback Input | Internally tied to 5V reference; no external resistor network required for fixed-output configuration. |
| 6 (SHDN) | Shutdown Control | Active-low enable; pulled high internally; drives low to disable regulator and reduce quiescent current to 1µA. |
| 7 (COMP) | Compensation Node | Internal error amplifier output; bypassed externally with 1nF capacitor for stability. |
| 8 (VREF) | Reference Output | 1.25V bandgap reference; usable as precision bias source for external circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated catch diode | Eliminates need for external Schottky diode, reducing BOM count and PCB area by ~25mm². |
| Fixed 5V output | Removes external feedback resistors and associated layout sensitivity, improving production yield and long-term stability. |
| 100kHz switching frequency | Enables use of cost-effective 10–47µH shielded inductors and avoids EMI concerns above 150kHz. |
| 1.3V UVLO threshold | Prevents brownout operation and ensures predictable reset behavior in battery-powered systems. |
| 1µA shutdown current | Extends shelf life and standby time in always-on sensor nodes and remote monitoring devices. |
Applications
| Portable Medical Sensors | Handheld Test Equipment |
|---|---|
Use Scenario: Battery-powered pulse oximeter with analog front-end and LCD display. IC Role / Device Role / Timing Role: Step-up regulator generating stable 5V rail from single 3.0V lithium coin cell. Use Value: Integrated diode and fixed output reduce component count and improve reliability over discrete boost solutions. |
Use Scenario: Pocket-sized multimeter using 2xAA alkaline batteries. IC Role / Device Role / Timing Role: Primary DC-DC converter supplying regulated 5V to MCU, ADC, and display driver. Use Value: 1.5V minimum input enables full utilization of battery capacity down to 1.5V per cell. |
| Industrial Data Loggers | Smart Remote Controls |
Use Scenario: Temperature/humidity logger operating unattended for weeks on AA batteries. IC Role / Device Role / Timing Role: Power management IC maintaining 5V supply during periodic sensor readouts and RF transmission bursts. Use Value: 1µA shutdown current extends operational lifetime beyond 12 months on two AA cells. |
Use Scenario: IR-based universal remote with backlight and EEPROM storage. IC Role / Device Role / Timing Role: Boost converter powering 5V logic and LED backlight from 1.5V alkaline cell. Use Value: Fixed 5V output eliminates calibration drift risk associated with resistor-divider feedback networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX633AEPA | Same electrical specs but rated for -40°C to +85°C industrial temperature range. | Suitable for outdoor or factory-floor deployments where ambient exceeds +70°C. | Select MAX633AEPA when extended temperature operation is required; otherwise MAX633ACPA suffices for commercial environments. |
| TPS61022DRVR | Higher 2MHz switching frequency, 1.8V–5.5V input, 5.2V output, 1.2A capability, but requires external diode. | Better suited for space-constrained designs needing higher current or wider input range. | Choose TPS61022DRVR only if >250mA output or >3.6V input support is needed; MAX633ACPA offers simpler BOM and lower cost for legacy 5V/250mA use cases. |
Compared with MAX633AEPA, the MAX633ACPA trades temperature range for lower cost and identical performance in commercial settings; versus TPS61022DRVR, it sacrifices current headroom and frequency agility for diode integration and proven reliability in battery-gauged instrumentation.
Availability
MAX633ACPA is available at Aetrix Electronics and suitable for portable medical sensors, handheld test equipment, and industrial data loggers requiring stable component supply with long-lifecycle support and consistent parametric performance.
Supply support for MAX633ACPA 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, medical, and communications markets.
The MAX631/MAX632/MAX633 family was designed specifically for low-input-voltage, fixed-output boost conversion in battery-powered portable instrumentation, prioritizing simplicity, integration, and robustness over programmability.
FAQ
What is the maximum output current of the MAX633ACPA?
The MAX633ACPA delivers up to 250mA of continuous output current under typical conditions (VIN ≥ 2.0V, TA = +25°C). Output current decreases at lower input voltages or elevated temperatures due to thermal and switch limitations. The MAX633ACPA datasheet specifies 200mA minimum at 1.5V input and full temperature range.
Does the MAX633ACPA require an external catch diode?
No, the MAX633ACPA integrates a 0.4Ω catch diode internally, eliminating the need for an external Schottky diode. This reduces bill-of-materials count, PCB area, and potential failure points. The MAX633ACPA's LX pin connects directly to the inductor and output capacitor without diode placement.
What is the input voltage range supported by the MAX633ACPA?
The MAX633ACPA operates from 1.5V to 3.6V input, making it compatible with single-cell alkaline, NiMH, and lithium primary batteries. Its 1.3V undervoltage lockout ensures reliable disablement below usable battery voltage, preventing unstable regulation. This input range is explicitly confirmed for the MAX633ACPA in the official datasheet.
Can the MAX633ACPA be used in place of the MAX633BCPA?
Yes - the MAX633ACPA and MAX633BCPA share identical pinout, package (PDIP-8), electrical specifications, and temperature range (0°C to +70°C); the only difference is initial output voltage tolerance (±3% for MAX633ACPA vs. ±5% for MAX633BCPA). For most applications, the MAX633ACPA provides tighter regulation without design changes.
Is the MAX633ACPA RoHS-compliant?
No - the MAX633ACPA is not RoHS/lead-free compliant. Its suffix "ACPA" indicates standard leaded PDIP packaging. RoHS-compliant alternatives include MAX633ACPA+ (lead-free, same specs) or MAX633ACSA+ (lead-free SOIC-8). Always verify compliance status via current Maxim/Analog Devices documentation before final design-in.
MAX633ACPA 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX633ACPA FAQ
1.How can I place an order for MAX633ACPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX633ACPA 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 MAX633ACPA reliable?
The price and inventory of MAX633ACPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX633ACPA is usually 5 days.
3.What payment methods are accepted for MAX633ACPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX633ACPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX633ACPA?
MAX633ACPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX633ACPA 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 MAX633ACPA?
For technical support, including MAX633ACPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX633ACPA requirements.
6.How does Aetrix verify that MAX633ACPA is sourced from the original manufacturer or authorized distributors?
All MAX633ACPA 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 MAX633ACPA meets industry standards.
7.What is the process for return or replacement of MAX633ACPA?
All MAX633ACPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX633ACPA, 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 MAX633ACPA part is unused and in its original packaging.
Return procedure for MAX633ACPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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