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Analog Devices Inc./Maxim Integrated MAX630CPA+
- Part No.:
- MAX630CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX630CPA+.pdf
- Description:
- IC REG BOOST ADJ 525MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,245
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Product details
Overview
MAX630CPA+ from Maxim Integrated is a CMOS micropower step-up switching regulator IC integrating a 1.31V bandgap reference, oscillator, voltage comparator, and 375mA N-channel output MOSFET in an 8-pin PDIP package. It operates from 2.0V to 16.5V input, delivers up to 5W output, achieves ±1.5% output voltage accuracy, and supports low-battery detection for battery-powered DC-DC converters.
For engineers reviewing the MAX630CPA+ datasheet, MAX630CPA+ pinout, MAX630CPA+ application, or MAX630CPA+ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-chain support details specific to the MAX630CPA+ variant.
Technical Context
The MAX630CPA+ implements pulse-frequency modulation (PFM) with a constant-frequency oscillator (40kHz typical with 47pF CX capacitor), where output regulation is achieved by skipping oscillator cycles when the feedback voltage at VFB exceeds 1.31V. Its internal N-channel MOSFET features 4Ω on-resistance and 525mA peak current capability, enabling efficient boost conversion without external drive circuitry.
It integrates dual comparator functionality: one for output voltage regulation (COMP1) comparing VFB to the 1.31V reference, and another (COMP2) for low-battery detection comparing LBR to the same reference. Shutdown is logic-level controlled via IC pin, reducing quiescent current to ≤1µA, while LBD provides open-drain warning output sinking up to 600µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.0V to 16.5V - supports single-cell Li-ion, multi-cell alkaline/NiCd, and wide industrial input rails without external regulators. |
| Output Accuracy | ±1.5% - ensures stable +5V/+12V/+15V outputs using standard 1% feedback resistors without trimming. |
| Operating Current | 70µA typical - enables >1-year battery life in 10µA standby systems with minimal load-dependent variation. |
| Shutdown Current | ≤1µA maximum - allows true zero-power sleep modes in portable instrumentation and remote sensors. |
| LX Peak Current | 525mA - sustains ≥20mA output at +15V from +5V input using standard 470µH inductors. |
| Oscillator Frequency | 40kHz (with 47pF CX) - balances switching loss vs. inductor size; adjustable from 0.1kHz to 75kHz via external capacitor. |
| Low-Battery Threshold | 1.31V on LBR pin - enables precise 3V/4.5V/9V battery end-of-life detection with <10nA bias current. |
Pinout & Package
MAX630CPA+ uses an 8-pin plastic DIP (PDIP) package rated for 0°C to +70°C operation, with through-hole mounting and industry-standard 0.3-inch width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 LBR | Low-battery detector input | Compares external voltage to 1.31V reference; triggers LBD output when below threshold - used for battery monitoring or power-fail detection. |
| 2 CX | Oscillator timing capacitor node | Connects to ground via ceramic capacitor (e.g., 47pF = 40kHz); sets switching frequency without external resistors. |
| 3 LX | Switching output driver | Drives external inductor with integrated 4Ω N-MOSFET; handles 525mA peak current - eliminates need for external transistor or gate driver. |
| 4 GND | Analog and power ground | Common return for reference, comparators, and oscillator; requires low-impedance PCB connection to minimize noise coupling. |
| 5 +VS | Main supply input | Accepts 2.0V–16.5V; powers all internal circuitry - can be bootstrapped from output for improved LX RON. |
| 6 IC | Logic-level shutdown control | Drives low (<0.2V) or floats to disable regulator; draws ≤10nA in shutdown - compatible with CMOS outputs or pullup resistors. |
| 7 VFB | Feedback voltage input | Monitors output divider ratio; regulates output when voltage falls below 1.31V - enables programmable output from +3V to +15V. |
| 8 LBD | Low-battery detector open-drain output | Sinks up to 600µA when LBR < 1.31V - directly drives LEDs, microcontroller interrupts, or enable inputs of downstream circuits. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated N-channel MOSFET switch | Eliminates external transistor and gate driver, reducing BOM count and layout area in space-constrained battery systems. |
| 1.31V precision bandgap reference | Enables ±1.5% output accuracy without calibration, supporting untrimmed +5V/+12V supplies in cost-sensitive consumer devices. |
| Logic-level shutdown (IC pin) | Reduces system standby power to ≤1µA, extending shelf life and operational runtime in IoT edge nodes and medical wearables. |
| Dual comparator architecture | Provides simultaneous output regulation and low-battery monitoring using shared 1.31V reference - avoids duplicate reference ICs. |
| Pin compatibility with RC4191/2/3 | Allows drop-in replacement of legacy bipolar regulators in existing designs, improving efficiency from ~65% to 85% without PCB changes. |
Applications
| +5V to +15V DC-DC Converter | High-Efficiency Battery-Powered DC-DC |
|---|---|
Use Scenario: Generating regulated +15V at 20mA from a +5V rail in portable test equipment. IC Role / Device Role / Timing Role: Step-up switching regulator providing isolated high-voltage supply for op-amp biasing and sensor excitation. Use Value: Achieves 85% efficiency with 470µH inductor and 47pF CX capacitor, eliminating need for bulky transformers or linear post-regulators. |
Use Scenario: Powering wireless sensor nodes from two AA alkaline cells (2.0V–3.2V). IC Role / Device Role / Timing Role: Micropower boost converter maintaining stable +3.3V output during deep discharge down to 2.0V input. Use Value: 70µA operating current and 1µA shutdown mode extend battery life beyond 2 years in low-duty-cycle monitoring applications. |
| 9V Battery Life Extension | Uninterruptible 5V Power Supply |
Use Scenario: Extending operational time of smoke detectors powered by 9V alkaline batteries. IC Role / Device Role / Timing Role: Efficient boost converter delivering regulated +5V to MCU and RF transceiver while monitoring battery health. Use Value: Low-battery detector (LBR/LBD) triggers early warning before critical voltage drop, while 85% efficiency doubles usable battery capacity. |
Use Scenario: Providing glitch-free +5V backup during AC mains failure in embedded controllers. IC Role / Device Role / Timing Role: Seamless switchover regulator that maintains continuous output by boosting NiCd battery voltage when line drops. Use Value: No output interruption or voltage sag during transfer; LBD output signals power failure to initiate safe shutdown sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX630CSA+ | Same electrical specs, but in 8-pin SO package (surface-mount) instead of PDIP; -40°C to +85°C temp range option available. | Preferred for automated SMT assembly and higher-density PCB layouts; not suitable for through-hole prototyping or socket-based testing. | Select MAX630CSA+ when board space is constrained and reflow soldering is used; retain MAX630CPA+ for hand-soldered prototypes or legacy through-hole systems. |
| MAX631CPA+ | Fixed +5V output version; eliminates external feedback resistors; shares same oscillator, shutdown, and LBD functionality. | Used where only +5V output is required; reduces component count but sacrifices output voltage flexibility. | Choose MAX631CPA+ for cost-optimized +5V-only designs; use MAX630CPA+ when variable output (e.g., +12V, +15V) or custom feedback is needed. |
Compared with MAX630CSA+, the MAX630CPA+ offers through-hole reliability and easier thermal management in low-volume builds; compared with MAX631CPA+, it provides full output programmability at the cost of two external resistors - making it the optimal choice for multi-voltage development platforms and field-programmable power supplies.
Availability
MAX630CPA+ is available at Aetrix Electronics and suitable for uninterruptible power supplies, battery life extension circuits, and portable instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX630CPA+ 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 MAX630CPA+ belongs to Maxim's micropower DC-DC converter product line, designed specifically for ultra-low-quiescent-current boost regulation in battery-critical systems such as medical devices, remote sensors, and portable instrumentation.
FAQ
What is the maximum output power achievable with the MAX630CPA+?
The MAX630CPA+ supports up to 5W output power in optimized designs. This is achieved using its 525mA peak LX current, 4Ω on-resistance, and efficient PFM control - for example, delivering 20mA at +15V from a +5V input with 85% efficiency. Real-world output depends on inductor selection, diode losses, and PCB layout, but the IC itself is rated for continuous operation within this range under proper thermal conditions.
Can the MAX630CPA+ operate from a single 1.5V alkaline cell?
No, the MAX630CPA+ requires a minimum 2.0V supply voltage per its Absolute Maximum Ratings and Electrical Characteristics tables. While startup may occur near 1.9V, reliable regulation is only guaranteed above 2.0V. For sub-2V battery operation, consider the MAX631 or MAX632 series, which feature lower startup thresholds and are explicitly characterized down to 1.5V.
How does the low-battery detector in the MAX630CPA+ function?
The MAX630CPA+ low-battery detector compares the voltage on pin 1 (LBR) to its internal 1.31V reference. When LBR falls below this threshold, the open-drain LBD output (pin 8) sinks up to 600µA. This allows direct connection to microcontroller GPIOs or LEDs without external components - and because LBR bias current is only 10nA max, high-impedance voltage dividers preserve battery life.
Is the MAX630CPA+ pin-compatible with the RC4191/2/3 series?
Yes, the MAX630CPA+ is explicitly designed as a pin-compatible upgrade to Raytheon's RC4191, RC4192, and RC4193 bipolar regulators. Pin assignments, footprint, and basic functionality match - allowing direct replacement in legacy designs. The key improvement is CMOS architecture, which cuts operating current from ~2mA to 70µA and extends minimum input voltage from ~3V to 2.0V.
What external components are mandatory for basic operation of the MAX630CPA+?
Four external components are mandatory: an inductor (e.g., 470µH) between LX and input, a catch diode (e.g., 1N4148) from LX to output, a feedback resistor divider (R1/R2) from output to VFB and ground, and an oscillator capacitor (e.g., 47pF) from CX to ground. Optional components include a shutdown pullup resistor on IC and a low-battery divider on LBR - but the core boost function works with just those four.
MAX630CPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.2V
- Voltage - Input (Max):
- 16.5V
- Voltage - Output (Min/Fixed):
- 2.2V
- Voltage - Output (Max):
- 18V (Switch)
- Current - Output:
- 525mA (Switch)
- Frequency - Switching:
- 40kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX630CPA+ FAQ
1.How can I place an order for MAX630CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX630CPA+ 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 MAX630CPA+ reliable?
The price and inventory of MAX630CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX630CPA+ is usually 5 days.
3.What payment methods are accepted for MAX630CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX630CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX630CPA+?
MAX630CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX630CPA+ 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 MAX630CPA+?
For technical support, including MAX630CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX630CPA+ requirements.
6.How does Aetrix verify that MAX630CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX630CPA+ 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 MAX630CPA+ meets industry standards.
7.What is the process for return or replacement of MAX630CPA+?
All MAX630CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX630CPA+, 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 MAX630CPA+ part is unused and in its original packaging.
Return procedure for MAX630CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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