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Analog Devices Inc./Maxim Integrated MAX763AMJA
- Part No.:
- MAX763AMJA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
MAX763AMJA.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,112
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Product details
Overview
The MAX763AMJA from Maxim Integrated is a military-grade, 3.3V-output, step-down DC-DC switching regulator with current-mode PWM control. It accepts input voltages from 3.3V to 11V, delivers up to 500mA load current, operates over –55°C to +125°C, and achieves 85–90% efficiency. It is used in ruggedized portable instrumentation and avionics power supplies where wide-temperature reliability is critical.
For engineers reviewing the MAX763AMJA datasheet, MAX763AMJA pinout, MAX763AMJA application, or MAX763AMJA equivalent, key selection criteria include its guaranteed 500mA output at –55°C to +125°C, 0.2µA shutdown current, fixed-frequency (159–212.5kHz) operation, and CERDIP-8 hermetic packaging for high-reliability environments.
Technical Context
The MAX763AMJA implements a current-mode PWM buck topology with dual-loop feedback: an inner current-sense loop enabling cycle-by-cycle current limiting (trip point ~1.2A), and an outer voltage loop regulating output via a precision 1.23V bandgap reference. Its oscillator is temperature-stable (±0.04%/°C) and guaranteed between 159kHz and 212.5kHz across the full military temperature range.
Protection features include undervoltage lockout (UVLO active below 2.7V), programmable soft-start (via external SS capacitor), and automatic SS-cycle initiation during fault recovery or wake-up from shutdown. The internal P-channel MOSFET switch has 1.0Ω typical on-resistance and supports discontinuous/continuous conduction mode based on load, input, and inductor value.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±5% over line, load, and –55°C to +125°C - ensures stable logic rail without external feedback resistors. |
| Input Voltage Range | 3.3V to 11V - compatible with Li-ion battery packs (3.6–4.2V), 5V rails, and 9V industrial supplies. |
| Max Output Current | 500mA at V+ ≥ 4.75V - sufficient for powering microcontrollers, ADCs, and RF front-ends in embedded systems. |
| Switching Frequency | 159kHz to 212.5kHz - enables predictable EMI filtering and use of standard 22µH off-the-shelf inductors. |
| Quiescent Current | 1.4mA typical - minimizes no-load power loss in always-on subsystems. |
| Shutdown Current | 0.2µA typical - preserves battery life in sleep-mode applications such as remote sensors. |
| UVLO Threshold | 2.7V (falling), 2.95V (rising) - prevents erratic startup during brownout conditions. |
| Reference Voltage | 1.23V ±30mV (±2.4%) - provides stable bias for external monitoring or precision scaling circuits. |
Pinout & Package
The MAX763AMJA is housed in an 8-pin CERDIP (ceramic dual in-line package) with hermetic sealing, rated for –55°C to +125°C operation and suitable for high-reliability aerospace and defense applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V+) | Supply Input | Primary power input (3.3–11V); requires local 1µF ceramic + bulk electrolytic bypass to GND. |
| 2 (LX) | Switch Node | Drain of internal P-channel MOSFET; connects to inductor and catch diode anode. |
| 3 (GND) | Power Ground | Common return for input/output capacitors, inductor, and diode cathode; must be low-inductance connection. |
| 4 (OUT) | Voltage Sense | Feedback input tied directly to regulated 3.3V output; sets regulation point via internal 1.23V reference. |
| 5 (CC) | Compensation | Outer-loop compensation node; requires 330pF capacitor to OUT for stability across input/load variations. |
| 6 (SS) | Soft-Start | Capacitor-based ramp control; 0.047µF yields ~4ms soft-start and enables overcurrent protection. |
| 7 (REF) | Reference Output | 1.23V bandgap reference (100µA max sink); bypassed with 1000pF to GND for noise immunity. |
| 8 (SHDN) | Shutdown Control | Active-low enable; tie to V+ for operation, ground for 0.2µA shutdown with zero output voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables precise cycle-by-cycle current limiting (~1.2A) and fast transient response without external compensation tuning. |
| Prequalified 22µH inductor | Eliminates magnetics design effort; guarantees 500mA output with standard off-the-shelf inductor (e.g., Coilcraft CTX-220). |
| Military temperature grade | Rated for –55°C to +125°C operation with full electrical specifications guaranteed - validated for space-qualified and airborne platforms. |
| Hermetic CERDIP packaging | Provides moisture resistance, long-term reliability, and immunity to outgassing in vacuum environments. |
| Integrated UVLO and soft-start | Prevents power-up surge currents and ensures orderly sequencing in multi-rail systems without external circuitry. |
| Low shutdown quiescent current | 0.2µA typical draw allows >10-year battery life in ultra-low-power sensor nodes using coin-cell batteries. |
Applications
| Avionics Power Distribution | Spacecraft Onboard Instrumentation |
|---|---|
Use Scenario: Powering flight-critical sensors and data acquisition units in UAVs and satellite subsystems exposed to extreme thermal cycling. IC Role / Device Role / Timing Role: Primary 3.3V step-down regulator converting unregulated 5–9V bus to clean, stable logic supply. Use Value: Guaranteed 500mA output at –55°C to +125°C and hermetic CERDIP packaging ensure uninterrupted operation in stratospheric and orbital environments. | Use Scenario: Supplying radiation-tolerant microcontrollers and analog front-ends in deep-space probe telemetry modules. IC Role / Device Role / Timing Role: High-reliability DC-DC converter delivering regulated 3.3V from primary battery or solar array bus. Use Value: 0.2µA shutdown current extends mission lifetime; UVLO prevents latch-up during solar panel shadowing events. |
| Tactical Radio Transceivers | Ruggedized Handheld Test Equipment |
Use Scenario: Providing isolated 3.3V rail for SDR baseband processors and RF synthesizers in manpack radios operating in desert/arctic conditions. IC Role / Device Role / Timing Role: Efficient buck regulator supporting burst-mode transmission with fast load-transient response. Use Value: 85–90% efficiency minimizes thermal load in sealed enclosures; 159–212.5kHz fixed frequency simplifies EMI filter design for MIL-STD-461 compliance. | Use Scenario: Powering FPGA-based signal analyzers and oscilloscope front-ends in field-deployable diagnostic tools. IC Role / Device Role / Timing Role: Main system regulator converting 9V battery or 12V vehicle supply to 3.3V core logic voltage. Use Value: Soft-start prevents inrush-induced voltage sag on shared battery rails; CC/DCM mode adaptability maintains regulation across varying load profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX763AEPA | Same architecture and pinout, but rated only for –40°C to +85°C in plastic DIP; lower cost, non-hermetic. | Suitable for commercial/industrial equipment without extreme environmental requirements. | Select when military temperature range and hermeticity are not required - reduces BOM cost by ~35%. |
| LM2678SD-3.3/NOPB | 5V-input optimized buck regulator (3.3V fixed), 500mA, SO-8, –40°C to +125°C; no REF/SS pins, different compensation scheme. | Lacks soft-start and reference output; requires external feedback network for adjustable variants. | Choose for cost-sensitive automotive or industrial designs where soft-start is managed externally and hermetic packaging is unnecessary. |
Compared with MAX763AEPA and LM2678SD-3.3/NOPB, the MAX763AMJA uniquely combines military-grade temperature range, hermetic CERDIP packaging, integrated soft-start/reference, and guaranteed 500mA performance across –55°C to +125°C - making it irreplaceable in mission-critical aerospace deployments.
Availability
MAX763AMJA is available at Aetrix Electronics and suitable for avionics power distribution, spacecraft instrumentation, tactical radio transceivers, and ruggedized handheld test equipment requiring stable component supply under extended temperature stress.
Supply support for MAX763AMJA 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 demanding applications.
The MAX763A product line was designed specifically for high-reliability, wide-temperature DC-DC conversion in defense, aerospace, and industrial systems where efficiency, small solution size, and guaranteed parametric performance across extremes are mandatory.
FAQ
What is the maximum input voltage rating for the MAX763AMJA?
The MAX763AMJA has an absolute maximum input voltage rating of +12V at the V+ pin. Its operational input range is specified from 3.3V to 11V. Exceeding 12V risks permanent damage per the Absolute Maximum Ratings table. The device includes undervoltage lockout that disables switching below ~2.7V, but does not provide overvoltage protection - external clamping or regulation is required if input transients exceed 12V.
Does the MAX763AMJA require external feedback resistors to set the output voltage?
No, the MAX763AMJA does not require external feedback resistors. It features a factory-trimmed, fixed 3.3V output achieved through internal resistor networks and a precision 1.23V bandgap reference. The OUT pin is connected directly to the regulated 3.3V output node for sensing, eliminating external components and ensuring ±5% accuracy over line, load, and temperature (–55°C to +125°C).
Can the MAX763AMJA drive a 500mA load continuously at +125°C?
Yes, the MAX763AMJA is fully specified to deliver 500mA continuous output current at +125°C ambient, provided V+ ≥ 4.75V and proper thermal management is implemented. Its 8-pin CERDIP package has a thermal resistance (θJA) of 125°C/W, and the datasheet guarantees 500mA performance across the entire –55°C to +125°C range with appropriate PCB copper area and airflow.
What is the purpose of the REF pin on the MAX763AMJA?
The REF pin on the MAX763AMJA outputs a precision 1.23V bandgap reference voltage, capable of sourcing up to 100µA. It is used to bias external circuitry such as monitoring comparators, ADC references, or level-shift networks. A 1000pF capacitor must be placed between REF and GND to ensure stability and low-noise operation - this bypass is mandatory per the datasheet layout guidelines.
Is the MAX763AMJA pin-compatible with other members of the MAX748A/MAX763A family?
Yes, the MAX763AMJA shares identical pinout and footprint with all 8-pin variants in the MAX748A/MAX763A family, including MAX763ACPA, MAX763AEPA, and MAX748AMJA. All 8-pin DIP and SO packages use the same top-view pin assignment: V+, LX, GND, OUT, CC, SS, REF, SHDN. This allows direct substitution within the same package type, though input voltage range and temperature grade differ between MAX748A (up to 16V) and MAX763A (up to 11V) variants.
MAX763AMJA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.3V
- Voltage - Input (Max):
- 11V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-CERDIP
MAX763AMJA FAQ
1.How can I place an order for MAX763AMJA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX763AMJA 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 MAX763AMJA reliable?
The price and inventory of MAX763AMJA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX763AMJA is usually 5 days.
3.What payment methods are accepted for MAX763AMJA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX763AMJA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX763AMJA?
MAX763AMJA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX763AMJA 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 MAX763AMJA?
For technical support, including MAX763AMJA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX763AMJA requirements.
6.How does Aetrix verify that MAX763AMJA is sourced from the original manufacturer or authorized distributors?
All MAX763AMJA 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 MAX763AMJA meets industry standards.
7.What is the process for return or replacement of MAX763AMJA?
All MAX763AMJA units undergo pre-shipment inspection (PSI). If there is an issue with MAX763AMJA, 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 MAX763AMJA part is unused and in its original packaging.
Return procedure for MAX763AMJA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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