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Analog Devices Inc./Maxim Integrated MAX630CSA
- Part No.:
- MAX630CSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX630CSA.pdf
- Description:
- IC REG BOOST ADJ 525MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,928
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Product details
Overview
MAX630CSA 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 SO package. It operates from 2.0V to 16.5V input, delivers up to 5W output, achieves 85% typical efficiency, and features logic-level shutdown (<1µA quiescent current) and low-battery detection - used in battery-powered +5V-to-+15V DC-DC converters.
For engineers reviewing the MAX630CSA datasheet, MAX630CSA pinout, MAX630CSA application, or MAX630CSA equivalent, key selection considerations include its ±1.5% output voltage accuracy, 4Ω LX on-resistance, 70µA operating current, 40kHz typical switching frequency (set by external CX capacitor), and compatibility with RC4191/2/3 bipolar regulators in space-constrained portable power designs.
Technical Context
The MAX630CSA implements pulse-frequency modulation (PFM) with a constant-frequency oscillator: it skips pulses when output voltage exceeds regulation threshold, enabling high efficiency at light loads. Its internal 1.31V reference compares against a resistive divider at VFB (pin 7) to control the LX (pin 3) N-channel MOSFET switch.
It integrates dual monitoring functions: LBR (pin 1) feeds a low-battery detector referenced to the same 1.31V bandgap, driving open-drain LBD (pin 8); IC (pin 6) provides logic-level shutdown with <1µA quiescent current. The LX driver delivers 525mA peak current with 4Ω on-resistance at +VS = 6V, scaling lower with higher supply voltage.
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 LDO pre-regulation. |
| Output Accuracy | ±1.5% - ensures stable +5V/+12V/+15V outputs with minimal trimming when using 1% feedback resistors. |
| Operating Current | 70µA typical - enables >1-year battery life in low-duty-cycle sensor nodes powered from 3V coin cells. |
| LX Switch On-Resistance | 4Ω at +VS = 6V - reduces conduction loss in boost inductors, supporting >85% efficiency at 20mA output. |
| Oscillator Frequency | 40kHz (with 47pF CX capacitor) - balances switching loss vs. magnetic size; adjustable from 0.1kHz to 75kHz via CX value. |
| Low-Battery Threshold | 1.31V on LBR pin - allows precise battery voltage monitoring (e.g., 3V cutoff at 2.62V via 2:1 divider) independent of main regulation loop. |
| Shutdown Quiescent Current | ≤1µA - enables zero-power standby in always-on systems; activated by pulling IC pin <0.2V or floating. |
Pinout & Package
MAX630CSA is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm body, 1.27mm pitch, RoHS-compliant, surface-mountable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 LBR | Low-battery detector input | Compares external voltage (e.g., scaled battery) to 1.31V reference; triggers LBD output when below threshold. |
| 2 CX | Oscillator timing capacitor node | Connects to ground via ceramic capacitor (e.g., 47pF for 40kHz); sets switching frequency with ±20% tolerance. |
| 3 LX | Switching node driver output | Drives external boost inductor; integrates 525mA peak-rated N-MOSFET with 4Ω on-resistance at +VS = 6V. |
| 4 GND | Analog and power ground | Common return for reference, comparator, oscillator, and LX switch; requires low-impedance PCB plane. |
| 5 +VS | Main supply input | Accepts 2.0V–16.5V; powers all internal circuitry; often bootstrapped from boosted output for lower RON. |
| 6 IC | Logic-level shutdown control | Active-low enable: <0.2V or floating disables all functions; tied to +VS or CMOS-high for normal operation. |
| 7 VFB | Feedback voltage input | Monitors resistive divider from output; regulates output when voltage falls below 1.31V reference. |
| 8 LBD | Open-drain low-battery indicator | Sinks up to 600µA when LBR <1.31V; drives LED or microcontroller interrupt without pull-up resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 70µA typical supply current enables >10-year shelf life in battery-backed memory retention circuits. |
| Integrated N-channel MOSFET | 375mA continuous / 525mA peak LX driver eliminates need for external switch, reducing BOM count and layout area. |
| Dual regulation & monitoring | Single chip performs both output voltage regulation (via VFB) and independent battery health monitoring (via LBR/LBD). |
| RC4191/2/3 pin compatibility | Direct drop-in replacement for legacy Raytheon bipolar regulators, enabling efficiency upgrades without PCB redesign. |
| Bootstrappable supply | +VS can be connected to boosted output, lowering LX RON and improving efficiency in high-output-voltage applications. |
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 controlling LX pulse width via VFB feedback loop; oscillator sets 40kHz switching rhythm. Use Value: Achieves 85% efficiency with no external transistor, reducing heat and extending 3xAA battery life beyond 12 months. |
Use Scenario: Powering low-duty-cycle wireless sensor nodes from 3V coin cells requiring +5V MCU supply. IC Role / Device Role / Timing Role: Micropower boost controller with shutdown mode; LBD monitors cell voltage decay during sleep cycles. Use Value: 70µA operating current + <1µA shutdown enables >5-year battery life; LBD flag wakes MCU before brownout. |
| 9V Battery Life Extension | Uninterruptible 5V Power Supply |
Use Scenario: Extending operational time of legacy 9V-powered instrumentation by boosting to stable +12V. IC Role / Device Role / Timing Role: Input-voltage-tolerant step-up regulator; uses LBR to detect end-of-life battery sag below 6.5V. Use Value: Maintains full output until battery drops to 5.2V (via 1.31V LBR threshold), extracting ~20% more usable energy. |
Use Scenario: Providing glitch-free +5V backup during AC mains failure in embedded controllers. IC Role / Device Role / Timing Role: Always-on boost converter sourcing from NiCd battery; LBD signals line failure to system supervisor. Use Value: Zero-transfer-time switchover; no output dip or reset; LBD-driven shutdown preserves battery during extended outages. |
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 |
|---|---|---|---|
| MAX631CSA | Fixed +5V output; no external feedback required; same 8-pin SO package and pinout. | Eliminates VFB resistor network but lacks programmability; unsuitable for variable or >5V outputs. | Select MAX631CSA only when fixed +5V output suffices and board space for feedback resistors must be minimized. |
| TPS61040DRVR | Higher 28V input rating; 0.5A switch; 500kHz–3MHz adjustable frequency; requires external compensation. | Better suited for compact, high-frequency designs with tight ripple specs; lacks integrated low-battery detector. | Choose TPS61040DRVR when >100mA output, wider input range, or faster transient response is required - but add discrete LBD circuitry. |
Compared with MAX631CSA, MAX630CSA offers output voltage flexibility at the cost of two external resistors; versus TPS61040DRVR, it trades higher frequency capability for integrated battery monitoring and lower quiescent current - critical for ultra-long-life battery systems.
Availability
MAX630CSA is available at Aetrix Electronics and suitable for uninterruptible power supplies, portable medical devices, and battery-backed data loggers requiring stable component supply across extended production lifecycles.
Supply support for MAX630CSA 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, automotive, and communications markets.
The MAX630CSA belongs to Maxim's micropower DC-DC converter product line, designed specifically for space- and energy-constrained battery-operated systems needing reliable voltage boosting with integrated monitoring functions.
FAQ
What is the maximum output power achievable with the MAX630CSA?
The MAX630CSA supports up to 5W output power in optimized designs. This is achieved using its 525mA peak LX current drive, low 4Ω on-resistance, and efficient PFM control - verified in typical +5V-to-+15V converter circuits delivering 20mA at 85% efficiency. Actual power depends on input voltage, inductor selection, and thermal management per the SO package's 441mW power dissipation limit.
Can the MAX630CSA operate from a single 1.5V alkaline cell?
No, the MAX630CSA cannot start from 1.5V. Its minimum startup voltage is 1.9V (per Absolute Maximum Ratings table), and recommended operating range begins at 2.0V. However, once running, it sustains operation down to 2.0V input - making it suitable for 2-cell alkaline (3V) or LiFePO₄ (3.2V) sources, but not single-cell primary batteries without auxiliary startup circuitry.
How does the low-battery detector in the MAX630CSA differ from the main regulation loop?
The MAX630CSA's low-battery detector uses the same 1.31V internal bandgap reference as the main regulator but compares it against the LBR pin voltage - independent of the VFB feedback network. This allows simultaneous, decoupled monitoring of battery health (e.g., 2.62V cutoff via 2:1 divider) while regulating output voltage (e.g., +15V via 11:1 divider), preventing false triggers during load transients.
Is the MAX630CSA pin-compatible with the RC4191/2/3 series?
Yes, the MAX630CSA is explicitly designed as a pin-compatible upgrade to Raytheon's RC4191, RC4192, and RC4193 bipolar regulators. Pin assignments, footprint, and functional roles match exactly - enabling direct replacement to improve efficiency, reduce quiescent current, and extend low-voltage operation without PCB changes.
What external components are mandatory for basic operation of the MAX630CSA?
Four external components are mandatory: an inductor (e.g., 470µH) between LX and output, a catch diode (e.g., 1N4148), an oscillator capacitor (e.g., 47pF) from CX to GND, and a feedback resistor divider (R1/R2) from output to VFB and GND. Optional but recommended are input/output capacitors and a pull-up on IC if not tied directly to +VS.
MAX630CSA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX630CSA FAQ
1.How can I place an order for MAX630CSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX630CSA 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 MAX630CSA reliable?
The price and inventory of MAX630CSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX630CSA is usually 5 days.
3.What payment methods are accepted for MAX630CSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX630CSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX630CSA?
MAX630CSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX630CSA 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 MAX630CSA?
For technical support, including MAX630CSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX630CSA requirements.
6.How does Aetrix verify that MAX630CSA is sourced from the original manufacturer or authorized distributors?
All MAX630CSA 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 MAX630CSA meets industry standards.
7.What is the process for return or replacement of MAX630CSA?
All MAX630CSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX630CSA, 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 MAX630CSA part is unused and in its original packaging.
Return procedure for MAX630CSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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