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Analog Devices Inc./Maxim Integrated MAX630ESA+
- Part No.:
- MAX630ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX630ESA+.pdf
- Description:
- IC REG BOOST ADJ 525MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:157
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Product details
Overview
MAX630ESA+ 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 MAX630ESA+ datasheet, MAX630ESA+ pinout, MAX630ESA+ application, or MAX630ESA+ equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternatives with functional differences, and supply-chain support for industrial and embedded power designs.
Technical Context
The MAX630ESA+ implements pulse-frequency modulation (PFM) with a constant-frequency oscillator (0.1–75kHz, set by external CX capacitor), where output pulses are skipped to regulate voltage - unlike PWM ICs, it uses a comparator against an internal 1.31V reference instead of an op-amp. Its LX pin drives external inductors via a 4Ω on-resistance N-channel MOSFET rated for 525mA peak current.
It integrates dual monitoring functions: VFB compares divided output voltage to the 1.31V reference for regulation, while LBR compares external voltage to the same reference to trigger open-drain LBD output (600µA sink capability). Shutdown is asserted when IC pin is <0.2V or floating, reducing supply 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 LDO pre-regulation. |
| Output Regulation Accuracy | ±1.5% - enables untrimmed ±3.5% system output accuracy with 1% feedback resistors, eliminating need for post-assembly trimming in cost-sensitive designs. |
| Operating Current | 70µA typical - ensures >80% efficiency at light loads (e.g., 100µA output), critical for battery life extension in always-on sensor nodes. |
| Shutdown Current | ≤1µA maximum - allows multi-year operation from coin cells in standby mode, with no external enable circuitry required. |
| LX Output Capability | 525mA peak, 4Ω on-resistance - directly drives standard off-the-shelf inductors (e.g., 470µH molded types) without gate-driver stages or external MOSFETs. |
| Oscillator Frequency Range | 0.1kHz to 75kHz - adjustable via single CX capacitor (e.g., 47pF = 40kHz); lower frequencies increase peak inductor current for higher output power at reduced input voltage. |
| Low-Battery Detection | 1.31V threshold with 10nA LBR bias - enables precise battery voltage monitoring (e.g., 3V cutoff for two AA cells) using only one external resistor divider. |
Pinout & Package
MAX630ESA+ is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm body, 1.27mm pitch, RoHS-compliant, rated for -40°C to +85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - LBR | Low-battery comparator input | Accepts external voltage divider; asserts LBD when voltage falls below 1.31V - used for battery cutoff or power-fail warning without additional comparators. |
| 2 - CX | Oscillator timing capacitor connection | Connects to ground via ceramic capacitor (e.g., 47pF for 40kHz); sets switching frequency to balance inductor size vs. conduction loss. |
| 3 - LX | N-channel MOSFET drain output | Drives external inductor; 4Ω on-resistance and 525mA peak rating allow direct interface with low-cost molded or toroidal inductors. |
| 4 - GND | Analog and power ground reference | Must be low-impedance star point; separates analog reference paths from high-di/dt LX return to prevent regulation instability. |
| 5 - +VS | Main supply input | Accepts 2.0V–16.5V; can be bootstrapped from output for improved LX drive (lower RON) or tied to input for minimal quiescent current. |
| 6 - IC | Logic-level shutdown control | Drives low (<0.2V) or floats to disable all internal circuitry; pulls up to +VS for normal operation - compatible with CMOS outputs or microcontroller GPIO. |
| 7 - VFB | Feedback voltage input | Compares divided output voltage to 1.31V reference; 10nA max bias current permits high-value resistor dividers (e.g., 1MΩ/47.5kΩ) to minimize load on output. |
| 8 - LBD | Open-drain low-battery detector output | Sinks up to 600µA when LBR <1.31V - directly drives LEDs, microcontroller interrupts, or PMIC enable inputs without pull-up resistors. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated N-channel MOSFET driver | Eliminates need for external transistor or gate driver - reduces BOM count and PCB area in space-constrained portable designs. |
| 1.31V precision bandgap reference | Enables accurate output voltage setting across temperature (-40°C to +85°C) without external voltage references or calibration. |
| Logic-compatible shutdown input | Allows direct interface with 3.3V/5V microcontrollers - no level-shifting required, simplifying power sequencing in battery-backed systems. |
| On-chip low-battery detector | Provides system-level battery monitoring with single-resistor divider - replaces discrete comparator circuits and saves board space. |
| CMOS PFM architecture | Delivers high efficiency at light loads (e.g., 70µA operating current) - outperforms bipolar equivalents that draw >2mA base current under same conditions. |
Applications
| Portable Medical Sensors | +5V to +15V Logic Supply |
|---|---|
Use Scenario: Wearable ECG monitor powered by two AA alkaline cells (1.8V–3.2V), requiring stable +5V for MCU and +15V for analog front-end op-amps. IC Role / Device Role / Timing Role: Step-up regulator providing regulated +5V and +15V outputs via separate feedback networks; LX switches at 40kHz to minimize inductor size. Use Value: 85% efficiency extends battery life to >6 months; integrated LBD triggers firmware alert at 2.2V/cell, preventing data corruption during brownout. |
Use Scenario: Industrial PLC I/O module with isolated +15V analog output stage, powered from shared +5V backplane rail. IC Role / Device Role / Timing Role: Boost converter generating +15V from +5V input; VFB regulates output to ±1.5% using 1% resistors; CX = 47pF sets 40kHz switching. Use Value: Eliminates need for external boost controller + MOSFET - reduces component count by 4 parts and layout area by 35% versus discrete solution. |
| Uninterruptible +5V Bus | 9V Battery Life Extension |
Use Scenario: Network switch with +5V main rail and NiMH backup battery; must maintain clean +5V during AC failure without glitches. IC Role / Device Role / Timing Role: Always-on boost regulator sourcing +5V from either line-derived 4.4V or 3.6V battery; LBD monitors line voltage to signal power loss. Use Value: Seamless switchover with zero output droop; 1µA shutdown current preserves battery for >1 year in standby - no mechanical relays or diode-OR required. |
Use Scenario: Handheld test instrument using 9V alkaline battery, requiring +5V at 100mA for LCD and microcontroller. IC Role / Device Role / Timing Role: Step-up converter with dynamic frequency scaling - CX network lowers oscillator frequency as battery drops below 6V to sustain output power. Use Value: Extends usable battery life by 40% versus fixed-frequency design; integrated low-battery detection disables non-critical peripherals at 4.8V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX631ESA+ | Fixed 5V output; no external feedback resistors required; same 8-pin SO package and pinout. | Used where output voltage is fixed and board space is constrained - eliminates R1/R2 but loses programmability. | Select MAX631ESA+ when 5V output suffices and BOM simplification is prioritized over voltage flexibility. |
| TPS61040DRVR | Higher 28V input rating; 0.5A switch current; requires external compensation; 6-pin WSON package. | Supports wider input range (1.8V–6V) and higher output power; lacks integrated low-battery detector and shutdown logic compatibility. | Choose TPS61040DRVR for >200mA loads or ultra-low input voltages (<2.0V), but expect added compensation complexity and no LBD function. |
Compared with MAX630ESA+, MAX631ESA+ trades programmability for simplicity and reduced component count, while TPS61040DRVR offers higher current and input range at the cost of missing integrated monitoring features and different footprint - neither is pin-compatible, but both serve overlapping boost-converter use cases.
Availability
MAX630ESA+ is available at Aetrix Electronics and suitable for portable medical sensors, uninterruptible +5V buses, 9V battery life extension circuits, and industrial +5V-to-+15V logic supplies requiring stable component supply across extended production lifecycles.
Supply support for MAX630ESA+ 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 communication applications - known for high-reliability, low-power solutions in harsh environments.
The MAX630ESA+ belongs to Maxim's micropower DC-DC converter product line, engineered specifically for battery-operated systems requiring high efficiency at light loads, integrated protection features, and minimal external components.
FAQ
What is the maximum output power achievable with MAX630ESA+?
The MAX630ESA+ supports up to 5W output power depending on input voltage, inductor selection, and operating frequency. At +5V input boosting to +15V, it delivers ~21mA continuously (315mW total output) with a 470µH inductor and 40kHz switching. Higher power is attainable using lower-inductance coils or reduced oscillator frequency to increase peak inductor current - the 525mA LX peak rating and 4Ω on-resistance define practical limits.
Does MAX630ESA+ require external compensation components?
No, the MAX630ESA+ does not require external compensation components for basic operation. Its PFM control loop is internally compensated and stable with standard feedback resistor dividers and output capacitors. However, when using large feedback resistors (>50kΩ), a 100pF–10nF lead-compensation capacitor across R1 may be needed to suppress low-frequency ripple caused by stray capacitance at the VFB node.
Can MAX630ESA+ operate with input voltage below 2.0V?
No - the absolute minimum specified input voltage for MAX630ESA+ is 2.0V. Startup voltage is guaranteed at 1.9V, but reliable regulation is not ensured below 2.0V across temperature. For sub-2.0V operation (e.g., single LiFePO₄ or depleted alkaline), consider alternatives like the TPS61040, which starts at 1.8V. The MAX630ESA+'s 1.31V reference and comparator thresholds are optimized for ≥2.0V operation.
How does the low-battery detector in MAX630ESA+ function?
The MAX630ESA+ low-battery detector compares voltage at LBR (pin 1) 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 LED driving or microcontroller interrupt signaling. Bias current at LBR is ≤10nA, enabling precise threshold setting with high-impedance resistor dividers - e.g., 1MΩ/475kΩ sets 3.0V detection for two AA cells.
Is MAX630ESA+ pin-compatible with the RC4191/2/3 series?
Yes - the MAX630ESA+ is explicitly designed as a pin-compatible CMOS replacement for Raytheon's bipolar RC4191/2/3 step-up regulators. Pin assignments (LBR, CX, LX, GND, +VS, IC, VFB, LBD) match identically, allowing drop-in substitution. Key improvements include 85% vs. ~65% efficiency, 70µA vs. >2mA operating current, and 2.0V vs. 4.5V minimum input voltage - enabling upgrades without PCB changes.
MAX630ESA+ 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:
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX630ESA+ FAQ
1.How can I place an order for MAX630ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX630ESA+ 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 MAX630ESA+ reliable?
The price and inventory of MAX630ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX630ESA+ is usually 5 days.
3.What payment methods are accepted for MAX630ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX630ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX630ESA+?
MAX630ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX630ESA+ 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 MAX630ESA+?
For technical support, including MAX630ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX630ESA+ requirements.
6.How does Aetrix verify that MAX630ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX630ESA+ 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 MAX630ESA+ meets industry standards.
7.What is the process for return or replacement of MAX630ESA+?
All MAX630ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX630ESA+, 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 MAX630ESA+ part is unused and in its original packaging.
Return procedure for MAX630ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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