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Analog Devices Inc./Maxim Integrated MAX630CSA+T
- Part No.:
- MAX630CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX630CSA+T.pdf
- Description:
- IC REG BOOST ADJ 525MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,007
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Product details
Overview
MAX630CSA+T 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 ±1.5% output voltage accuracy, and supports low-battery detection for battery-powered DC-DC converters.
For engineers reviewing the MAX630CSA+T datasheet, MAX630CSA+T pinout, MAX630CSA+T application, or MAX630CSA+T equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support details specific to industrial and embedded power design.
Technical Context
The MAX630CSA+T implements pulse-frequency modulation (PFM) with a constant-frequency oscillator (0.1–75kHz, set by external CX capacitor), where output regulation is achieved by skipping pulses rather than varying duty cycle. Its internal 1.31V reference compares against a resistor-divided VFB signal to control the LX output MOSFET.
It features dual functional blocks: a primary boost regulator (LX pin drives external inductor; peak current 525mA; on-resistance 4Ω at +VS = 6V) and an independent low-battery detector (LBR input threshold ≈1.31V; open-drain LBD output sinks up to 600µA). Shutdown is logic-level active-low via IC pin, reducing quiescent current to ≤1µA.
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-input industrial rails without external regulators. |
| Output Accuracy | ±1.5% - enables untrimmed 5V/12V/15V outputs using standard 1% feedback resistors; no calibration required. |
| Operating Current | 70µA typical - ensures >85% efficiency even at 100µW load; critical for long-life battery systems. |
| Shutdown Current | ≤1µA maximum - extends shelf life and standby time in always-on sensor nodes and IoT endpoints. |
| LX Peak Current | 525mA - defines maximum deliverable power (e.g., ~21mA at +15V from +5V input with 470µH inductor). |
| Oscillator Frequency | 0.1–75kHz - adjustable via CX capacitor (e.g., 47pF → 40kHz); balances switching loss vs. inductor size. |
| Low-Battery Threshold | 1.31V (typ) at LBR - allows precise battery end-of-life detection down to 2.0V system input. |
Pinout & Package
MAX630CSA+T uses an 8-pin SO (Small Outline) package, 150mil width, with gull-wing leads and JEDEC MS-012AC footprint. Thermal resistance θJA = 150°C/W; derating begins above +50°C (5.88mW/°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 LBR | Low-battery comparator input | Accepts external voltage divider; triggers LBD when below 1.31V - used for battery monitoring or power-fail detection. |
| 2 CX | Oscillator timing capacitor node | Connects to ground via ceramic cap (e.g., 47pF); sets switching frequency - no precision required, tolerant of ±20% variation. |
| 3 LX | N-channel MOSFET drain output | Drives external inductor; 4Ω on-resistance at +VS=6V; handles 525mA peak - requires catch diode and proper PCB layout for thermal management. |
| 4 GND | Analog and power ground reference | Must be low-impedance star point; separates analog bias from high-di/dt LX return path to prevent oscillation. |
| 5 +VS | Main supply input | Accepts 2.0–16.5V; powers all internal circuitry; bootstrapping from boosted output improves LX drive and efficiency. |
| 6 IC | Logic-level shutdown control | Drive <0.2V or float to disable regulator; draws ≤10nA in shutdown - compatible with microcontroller GPIO without level shifters. |
| 7 VFB | Feedback voltage sense input | Compares against 1.31V reference; sets output via R1/R2 divider - bias current ≤10nA enables high-impedance dividers (up to 1MΩ). |
| 8 LBD | Open-drain low-battery detector output | Sinks up to 600µA when LBR <1.31V - directly drives LEDs, microcontroller interrupts, or enable pins of downstream circuits. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated N-channel MOSFET driver | Eliminates need for external transistor and base/gate drive circuitry - reduces BOM count and layout complexity in space-constrained designs. |
| Onboard 1.31V precision reference | Enables accurate output setting without external voltage reference IC - improves long-term stability and reduces temperature drift sensitivity. |
| Logic-compatible shutdown input | Allows direct interface with 3.3V/5V microcontrollers; eliminates need for pull-up resistors or level translators in battery-gated systems. |
| Low-battery detector with open-drain output | Provides system-level power monitoring without additional comparators - simplifies battery management in portable medical and handheld devices. |
| CMOS architecture with 70µA operating current | Delivers higher efficiency than bipolar equivalents (e.g., RC4191) at light loads - extends runtime in intermittent-duty applications like wireless sensors. |
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 industrial I/O modules. IC Role / Device Role / Timing Role: Step-up regulator controlling LX switch timing via PFM; VFB regulates output; LBD monitors auxiliary supply. Use Value: Achieves 85% efficiency with minimal external components (1 inductor, 1 diode, 2 caps, 2 resistors) - reduces heat and board area vs. discrete solutions. |
Use Scenario: Powering a low-power MCU and RF transceiver from a single 3.6V Li-ion cell. IC Role / Device Role / Timing Role: Boost converter maintaining stable 3.3V output while dynamically adjusting frequency via optional LBR circuit as battery depletes. Use Value: Extends usable battery life by 30% compared to fixed-frequency PFM regulators - due to reduced switching loss at low input voltage. |
| Uninterruptible 5V Power Supply | 9V Battery Life Extension |
Use Scenario: Seamless switchover between wall adapter and NiCd backup in network edge devices. IC Role / Device Role / Timing Role: Always-on boost regulator sourcing +5V bus; LBD signals power failure to host controller for graceful shutdown. Use Value: Eliminates output glitches during transfer; enables zero-downtime operation - critical for Ethernet switches and PoE injectors. |
Use Scenario: Replacing legacy 9V alkaline batteries in smoke detectors with longer-lasting 3V coin cells. IC Role / Device Role / Timing Role: Step-up converter delivering 5V at 10mA from 2.0–3.0V input; IC pin enables periodic wake-up bursts to minimize average current. Use Value: Increases battery service life from 6 months to >2 years - due to 70µA quiescent current and sub-1µA shutdown mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX631CSA+ | Fixed 5V output; no external feedback required; same pinout and package. | Eliminates R1/R2 divider but lacks programmability - suitable only for 5V-only systems. | Select when output voltage is fixed and board space is constrained; not interchangeable for variable-output designs. |
| TPS61040DRVR | Higher 28V input rating; 0.5A switch current; integrated soft-start; 500kHz max frequency. | Requires different compensation and layout; optimized for compact, high-frequency designs - not drop-in. | Choose for higher input voltage range or faster transient response; requires full revalidation of magnetics and loop stability. |
Compared with MAX631CSA+, MAX630CSA+T offers programmable output and lower quiescent current (70µA vs. 85µA), making it superior for multi-voltage or ultra-low-power systems; versus TPS61040DRVR, it trades higher frequency for lower EMI and simpler magnetics, favoring cost-sensitive battery applications over space-constrained ones.
Availability
MAX630CSA+T is available at Aetrix Electronics and suitable for uninterruptible power supplies, battery life extension circuits, and high-efficiency portable DC-DC converters requiring stable component supply across extended production lifecycles.
Supply support for MAX630CSA+T 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) designs precision analog and mixed-signal ICs for power management, sensing, and connectivity in industrial, automotive, and computing applications.
The MAX630CSA+T belongs to Maxim's micropower DC-DC converter family, engineered specifically for battery-operated systems demanding high efficiency at light loads, low-voltage startup, and integrated protection features.
FAQ
What is the minimum input voltage required for MAX630CSA+T to start regulation?
The MAX630CSA+T has a guaranteed startup voltage of 1.9V (min) per datasheet Electrical Characteristics table. At room temperature, it reliably initiates regulation from 2.0V input, enabling operation from partially discharged lithium or two alkaline cells. Startup behavior is verified across the full 0°C to +70°C commercial temperature range specified for the MAX630CSA+T.
Can MAX630CSA+T be used in a buck configuration?
No, the MAX630CSA+T is designed exclusively for boost (step-up) topology. Its internal N-channel MOSFET is configured as a low-side switch driving the inductor to ground; it lacks the high-side drive capability or control architecture needed for buck operation. Attempting buck use would result in failure to regulate or device damage.
What is the recommended inductor value for a +3V to +5V application using MAX630CSA+T?
For +3V to +5V at 40mA output, the datasheet Figure 5 specifies a 220µH inductor. This value balances peak current (within 525mA limit), ripple, and physical size. Using 470µH reduces peak current but lowers available output power; values below 100µH risk exceeding LX current rating under load. Dale IHA-104 (500µH, 0.5Ω) is a validated off-the-shelf option.
Does MAX630CSA+T require an external diode, and what type is recommended?
Yes, MAX630CSA+T requires an external catch diode. For ≤100mA peak current, 1N4148 signal diodes are sufficient. For higher currents or improved efficiency, Schottky diodes like 1N5817 (1A, 0.45V VF) are recommended. General-purpose rectifiers (e.g., 1N4001) must be avoided due to slow turn-on causing excessive conduction loss.
How does the low-battery detector in MAX630CSA+T function independently of the main regulator?
The MAX630CSA+T's low-battery detector uses a dedicated comparator comparing LBR voltage to the same 1.31V internal reference used by VFB. It operates fully independently - LBD activates even when the main regulator is shut down via IC pin, enabling system-level battery monitoring during standby. LBD output remains functional down to +VS = 2.0V.
MAX630CSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX630CSA+T FAQ
1.How can I place an order for MAX630CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX630CSA+T 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+T reliable?
The price and inventory of MAX630CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX630CSA+T is usually 5 days.
3.What payment methods are accepted for MAX630CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX630CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX630CSA+T?
MAX630CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX630CSA+T 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+T?
For technical support, including MAX630CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX630CSA+T requirements.
6.How does Aetrix verify that MAX630CSA+T is sourced from the original manufacturer or authorized distributors?
All MAX630CSA+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX630CSA+T?
All MAX630CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX630CSA+T, 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+T part is unused and in its original packaging.
Return procedure for MAX630CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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