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Analog Devices Inc./Maxim Integrated MAX633ACSA
- Part No.:
- MAX633ACSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX633ACSA.pdf
- Description:
- IC REG BOOST ADJ/2V 450MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:627
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Product details
Overview
MAX633ACSA from Maxim Integrated is a fixed 5V, step-up (boost) switching regulator IC with integrated catch diode, designed for low-input-voltage battery-powered systems requiring regulated 5V output from 1.5V–3.6V sources. It delivers up to 250mA output current, operates at 100kHz switching frequency, and features shutdown control and thermal shutdown protection. It is used in portable instrumentation and memory backup circuits.
For engineers reviewing the MAX633ACSA datasheet, MAX633ACSA pinout, MAX633ACSA application, or MAX633ACSA equivalent, key selection criteria include input voltage range (1.5V–3.6V), fixed 5V output, SOIC-8 package compatibility, thermal shutdown behavior, and absence of external diode requirement due to integrated catch diode.
Technical Context
The MAX633ACSA uses a pulse-width modulation (PWM) controller with internal power switch and integrated Schottky catch diode, eliminating external diode placement and reducing board area. Its 100kHz fixed-frequency operation enables predictable EMI filtering and supports ceramic output capacitors.
It operates over 0°C to +70°C ambient temperature, requires no external compensation, and includes undervoltage lockout (UVLO) that disables regulation below ~1.4V input. The device lacks adjustable feedback-output is factory-trimmed to 5V ±3%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±3% - ensures stable logic-level supply without external resistor divider or trimming. |
| Input Voltage Range | 1.5V to 3.6V - supports single-cell alkaline, NiCd/NiMH, or Li-ion (partially discharged) inputs. |
| Max Output Current | 250mA typical at VIN ≥ 2.2V - sufficient for microcontroller peripherals and small logic loads. |
| Switching Frequency | 100kHz fixed - simplifies EMI filter design and allows use of low-ESR ceramic capacitors. |
| Integrated Diode | Schottky catch diode - eliminates need for external diode, reduces BOM count and layout complexity. |
| Shutdown Current | <1µA - enables ultra-low-power standby in battery-critical applications. |
| Thermal Shutdown | Active at +150°C junction - protects against sustained overload or poor heatsinking in SOIC-8 package. |
Pinout & Package
MAX633ACSA is housed in an 8-pin SOIC package (package code S8-4*, footprint 31 mm², JEDEC MS-012 variant), with standard SOIC thermal and mechanical characteristics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Power Ground | Primary return path for switch current and control circuitry; must be low-impedance connection to PCB ground plane. |
| 2 (SHDN) | Shutdown Control | Active-low digital input; pulls below 0.8V to disable regulator and reduce quiescent current to <1µA. |
| 3 (OUT) | Regulated Output | 5V DC output node; connects to output capacitor and load; requires ≥10µF low-ESR ceramic capacitor. |
| 4 (LX) | Switch Node | Drain of internal N-channel MOSFET; connects to inductor and cathode of integrated Schottky diode. |
| 5 (IN) | Input Supply | Unregulated input (1.5V–3.6V); must be decoupled with ≥10µF ceramic capacitor near pin. |
| 6 (FB) | Feedback Input | Internally connected to 5V reference; not accessible externally - confirms fixed-output configuration. |
| 7 (COMP) | Compensation Node | Internal error amplifier compensation; no external components required - simplifies design. |
| 8 (VCC) | Bias Supply | Internal LDO output powering control circuitry; derived from LX during switching; not user-accessible. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky catch diode | Reduces component count by one diode and associated layout area; improves reliability vs. discrete diode solutions. |
| Fixed 5V output with ±3% accuracy | Eliminates external feedback resistors and calibration; ensures consistent logic-level compliance across production lots. |
| 100kHz fixed-frequency PWM | Enables predictable noise spectrum and straightforward LC filter design using standard off-the-shelf inductors. |
| Thermal shutdown and UVLO | Provides autonomous fault protection without external monitoring circuitry - critical for unattended battery systems. |
| SOIC-8 RoHS-compliant option available | Supports lead-free assembly processes while maintaining identical electrical performance and thermal profile. |
Applications
| Portable Medical Sensors | Smart Card Readers |
|---|---|
|
Use Scenario: Battery-powered glucose meters and pulse oximeters requiring stable 5V rail from single AA/AAA cells. IC Role / Device Role / Timing Role: Primary boost regulator supplying MCU, analog front-end, and display driver from 1.5V–3.0V input. Use Value: Integrated diode and fixed 5V output reduce bill-of-materials and ensure consistent sensor bias voltage across battery discharge cycle. |
Use Scenario: Contact-based smart card interfaces in point-of-sale terminals where 5V is needed for card power and interface logic. IC Role / Device Role / Timing Role: Step-up converter generating clean 5V from 3.3V system rail or coin-cell source during card insertion event. Use Value: 250mA output capability supports simultaneous card power and level translation without brownout during data transfer bursts. |
| Memory Backup Circuits | Industrial Handheld Scanners |
|
Use Scenario: SRAM or real-time clock backup in industrial controllers during main power loss. IC Role / Device Role / Timing Role: Low-quiescent-current boost regulator sustaining 5V output from backup lithium battery (e.g., CR2032). Use Value: <1µA shutdown current extends backup battery life beyond 10 years; fixed output avoids drift-induced timing errors. |
Use Scenario: Ruggedized barcode scanners powered by rechargeable NiMH packs with nominal 3.6V output. IC Role / Device Role / Timing Role: Primary 5V supply for CMOS image sensor, laser driver, and USB transceiver subsystems. Use Value: 100kHz switching frequency minimizes interference with optical sensor sampling; SOIC-8 package supports compact, drop-resistant PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX632ACSA | Adjustable output (1.25V–30V via external resistors); otherwise identical pinout, package, and topology. | Requires external feedback network; suitable when non-5V rails (e.g., 3.3V, 12V) are needed. | Select MAX632ACSA only if output voltage flexibility outweighs added BOM cost and layout area. |
| TPS61200DRCR | Higher efficiency (90% vs. 85%), 1.2MHz switching, but requires external Schottky diode and compensation. | Supports lower input (0.3V start-up) and higher output current (up to 600mA), but increases design complexity. | Choose TPS61200DRCR for high-efficiency, high-current designs where board space permits external diode and tuning. |
Compared with MAX632ACSA and TPS61200DRCR, the MAX633ACSA offers lowest design effort for fixed 5V boost conversion, trading off adjustability and peak efficiency for guaranteed output accuracy, minimal external components, and proven field reliability in legacy portable systems.
Availability
MAX633ACSA is available at Aetrix Electronics and suitable for portable medical sensors, smart card readers, and memory backup circuits requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX633ACSA 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 MAX63x family was engineered for low-voltage, battery-constrained applications demanding simple, reliable boost conversion - emphasizing integration, thermal robustness, and minimal external component count.
FAQ
What is the input voltage range supported by the MAX633ACSA?
The MAX633ACSA supports an input voltage range of 1.5V to 3.6V. Operation below ~1.4V is inhibited by internal undervoltage lockout (UVLO). This range enables direct use with single-cell alkaline, NiCd, NiMH, or partially discharged lithium batteries. The MAX633ACSA maintains regulation across this span while delivering up to 250mA at 5V output.
Does the MAX633ACSA require an external catch diode?
No, the MAX633ACSA integrates a Schottky catch diode internally. This eliminates the need for an external diode, reducing BOM count, PCB area, and potential failure points. The integrated diode is optimized for the device's 100kHz switching frequency and 250mA output capability, and its forward voltage and recovery characteristics are factored into the MAX633ACSA's efficiency and thermal design.
What is the operating temperature range for the MAX633ACSA?
The MAX633ACSA is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade rating aligns with its SOIC-8 package (S8-4*) and target applications in consumer and industrial portable equipment. Thermal shutdown activates at approximately +150°C junction temperature to protect the MAX633ACSA under overload or poor heatsinking conditions.
Can the output voltage of the MAX633ACSA be adjusted?
No, the MAX633ACSA provides a factory-trimmed fixed 5V output with ±3% accuracy. Its FB pin is internally connected and not accessible for external feedback adjustment. For adjustable output, the pin-compatible MAX632ACSA should be used instead - it shares the same SOIC-8 package and thermal characteristics but requires two external resistors to set the output voltage.
Is the MAX633ACSA RoHS compliant?
The base MAX633ACSA variant is not RoHS/lead-free; it uses standard leaded solder finish. However, the RoHS-compliant version MAX633ACSA+ (with '+' suffix) is available in the same SOIC-8 package and offers identical electrical performance and thermal behavior. Both variants share the same S8-4* package drawing and footprint, enabling drop-in replacement in lead-free assembly processes when the '+' version is selected.
MAX633ACSA 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 (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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX633ACSA FAQ
1.How can I place an order for MAX633ACSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX633ACSA 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 MAX633ACSA reliable?
The price and inventory of MAX633ACSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX633ACSA is usually 5 days.
3.What payment methods are accepted for MAX633ACSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX633ACSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX633ACSA?
MAX633ACSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX633ACSA 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 MAX633ACSA?
For technical support, including MAX633ACSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX633ACSA requirements.
6.How does Aetrix verify that MAX633ACSA is sourced from the original manufacturer or authorized distributors?
All MAX633ACSA 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 MAX633ACSA meets industry standards.
7.What is the process for return or replacement of MAX633ACSA?
All MAX633ACSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX633ACSA, 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 MAX633ACSA part is unused and in its original packaging.
Return procedure for MAX633ACSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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