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Analog Devices Inc./Maxim Integrated MAX763AESA+
- Part No.:
- MAX763AESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX763AESA+.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
MAX763AESA+ from Maxim Integrated is a 3.3V-output, current-mode PWM step-down DC-DC converter IC designed for high-efficiency power conversion in space-constrained systems. It accepts input voltages from 3.3V to 11V, delivers up to 500mA load current, achieves 85–90% efficiency, and features 1.4mA quiescent supply current and 0.2µA shutdown current. It is commonly used in portable instrumentation and hand-held computers requiring stable, low-noise 3.3V rails.
For engineers reviewing the MAX763AESA+ datasheet, MAX763AESA+ pinout, MAX763AESA+ application, or MAX763AESA+ equivalent, key selection criteria include input voltage range (3.3V–11V), guaranteed ±5% output voltage accuracy over line/load/temperature, fixed-frequency PWM operation (159–212.5kHz), integrated P-channel MOSFET switch, and SO-8 package compatibility with standard PCB layouts.
Technical Context
The MAX763AESA+ implements a current-mode PWM buck regulator architecture with dual feedback loops: an inner current-sense loop enabling cycle-by-cycle current limiting and an outer voltage-error loop regulating output via the REF/OUT/CC pins. Its oscillator operates at 159–212.5kHz over temperature, ensuring predictable ripple filtering and minimal EMI.
It integrates protection features including undervoltage lockout (2.7V turn-off, 2.95V turn-on), programmable soft-start (via SS pin capacitor), overcurrent limiting (~1.2A peak), and thermal-safe shutdown. The internal 1.23V bandgap reference supplies up to 100µA and requires a 1000pF bypass capacitor at REF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±5% over line, load, and temperature - ensures stable logic rail without external resistor divider. |
| Input Voltage Range | 3.3V to 11V - supports single-cell Li-ion (fully charged) and regulated 5V/9V supplies. |
| Max Output Current | 500mA continuous - sufficient for microcontrollers, FPGAs, and interface ICs in portable designs. |
| Switching Frequency | 159–212.5kHz - enables use of small 22µH inductor and simplifies EMI filter design. |
| Quiescent Current | 1.4mA typical - minimizes standby power loss in battery-powered applications. |
| Shutdown Current | 0.2µA typical - extends battery life during system sleep modes. |
| Efficiency | 85–90% at 100–300mA loads - reduces thermal stress and improves power density. |
| Output Accuracy | ±5% over full operating range - meets tight tolerance requirements for 3.3V I/O and core rails. |
Pinout & Package
MAX763AESA+ is housed in an 8-pin SO (Small Outline) package with exposed pad (SOIC-8EP), compatible with industry-standard reflow profiles and PCB footprints. Thermal performance is enhanced by the exposed die paddle connected internally to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V+) | Supply Input | DC input (3.3V–11V); must be bypassed with 1µF ceramic + bulk capacitor close to pin. |
| 2 (LX) | Switch Node | Drain of internal P-channel MOSFET; connects to inductor and catch diode anode. |
| 3 (GND) | Power Ground | Primary return path for switch current and control circuitry; tied to exposed pad. |
| 4 (OUT) | Voltage Sense Input | Feedback node connected directly to regulated 3.3V output for precision regulation. |
| 5 (CC) | Compensation Input | External compensation point for voltage-loop stability; requires 330pF to OUT. |
| 6 (SS) | Soft-Start Control | Capacitor-to-ground sets startup ramp time and limits inrush current during power-up. |
| 7 (REF) | Reference Output | Stable 1.23V bandgap reference (100µA max); bypassed with 1000pF to GND. |
| 8 (SHDN) | Shutdown Enable | Active-low digital control; pull low to disable regulator and reduce supply current to 0.2µA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P-channel MOSFET switch | Eliminates need for external high-side switch and associated gate drive complexity. |
| Fixed 3.3V output with no external resistors | Reduces BOM count and layout area; avoids resistor tolerance drift affecting regulation. |
| 22µH prequalified inductor support | Enables rapid design-in without magnetics engineering; validated for 500mA operation. |
| Cycle-by-cycle current limiting | Prevents destructive overcurrent events during short-circuit or overload transients. |
| Programmable soft-start via SS pin | Controls inrush current and prevents output overshoot during power-up sequences. |
| Undervoltage lockout (UVLO) | Ensures clean start-up only when input exceeds 2.95V and prevents brown-out operation. |
Applications
| Portable Instrumentation | Hand-Held Computers |
|---|---|
|
Use Scenario: Battery-powered multimeters and data loggers requiring precise 3.3V analog and digital rails. IC Role / Device Role / Timing Role: Primary step-down regulator converting 7.2V Li-ion pack to stable 3.3V for ADC, MCU, and display controller. Use Value: 85–90% efficiency extends runtime; ±5% output accuracy ensures measurement integrity across temperature. |
Use Scenario: Ruggedized PDAs and industrial handheld terminals with intermittent high-current bursts. IC Role / Device Role / Timing Role: Core power supply delivering 500mA peak to ARM-based SoC and touchscreen controller. Use Value: Cycle-by-cycle current limiting protects against transient overloads; 159–212.5kHz switching enables compact LC filter design. |
| Cellular Phones (Legacy Baseband) | Computer Peripherals |
|
Use Scenario: 2G/3G feature phone subsystems powering baseband processors and RF front-end bias rails. IC Role / Device Role / Timing Role: Secondary 3.3V regulator fed from main PMIC or battery, supporting low-noise analog sections. Use Value: 0.2µA shutdown current preserves battery charge during idle; soft-start prevents supply rail collapse on wake-up. |
Use Scenario: USB-powered docking stations and external storage enclosures needing isolated 3.3V logic supply. IC Role / Device Role / Timing Role: Standalone buck converter deriving 3.3V from 5V USB VBUS with minimal external components. Use Value: Fixed 3.3V output eliminates feedback resistors; SO-8 package supports automated assembly and thermal relief. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 3.3V fixed output, 1.8–6.5V input, 400mA max, 2.25MHz switching frequency, smaller 6-pin WSON package. | Higher frequency enables smaller inductors/capacitors but increases switching losses above 300mA. | Preferred for ultra-compact, high-density layouts where thermal headroom allows lower current capability. |
| LT1935ES5#TRMPBF | 3.3V fixed output, 3.6–36V input, 1.1A max, 1.25MHz frequency, integrated Schottky diode, SOT-23-5 package. | Wider input range and higher current suit 12V industrial inputs, but higher quiescent current (2.5mA). | Best for systems with variable or high-voltage inputs where MAX763AESA+'s 11V limit is insufficient. |
Compared with TPS62231DRVR and LT1935ES5#TRMPBF, the MAX763AESA+ offers superior efficiency at mid-load (85–90% @ 300mA), lower shutdown current (0.2µA), and proven reliability in extended temperature (-40°C to +85°C) portable applications - making it optimal for cost-sensitive, thermally constrained 3.3V conversion where input stays ≤11V.
Availability
MAX763AESA+ is available at Aetrix Electronics and suitable for portable instrumentation, hand-held computers, and computer peripherals requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX763AESA+ 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 MAX763AESA+ belongs to Maxim's legacy high-efficiency DC-DC converter product line, engineered specifically for reliable, low-component-count 3.3V power delivery in battery-operated and space-constrained embedded systems.
FAQ
What is the input voltage range supported by the MAX763AESA+?
The MAX763AESA+ supports an input voltage range of 3.3V to 11V. Operation below 3.3V is not guaranteed due to undervoltage lockout activation, and exceeding 11V may cause permanent damage per absolute maximum ratings. This range makes the MAX763AESA+ ideal for single-cell Li-ion (3.0–4.2V) and regulated 5V/9V supplies in portable equipment.
Does the MAX763AESA+ require external feedback resistors to set the output voltage?
No, the MAX763AESA+ provides a fixed 3.3V output and does not require external feedback resistors. Its internal voltage reference and error amplifier are factory-trimmed to deliver ±5% output accuracy over line, load, and temperature - reducing BOM count and eliminating resistor tolerance-induced drift in the MAX763AESA+ design.
What package type is used for the MAX763AESA+ and what are its thermal characteristics?
The MAX763AESA+ uses an 8-pin SO (SOIC-8) package with exposed thermal pad (designated "ESA"). The exposed pad is internally connected to GND and significantly improves thermal dissipation. At TA = +70°C, the package has a derating factor of 5.88mW/°C, supporting up to 471mW continuous power dissipation - sufficient for typical 500mA operation with proper PCB copper pour.
How does the soft-start function work on the MAX763AESA+?
The MAX763AESA+ implements soft-start via the SS pin: connecting a capacitor (e.g., 0.047µF) between SS and GND controls the ramp rate of the output voltage during power-up. This limits inrush current, prevents output overshoot, and initiates an internal discharge cycle during overcurrent or UVLO faults - all critical for robust behavior in the MAX763AESA+'s target applications.
Can the MAX763AESA+ operate in discontinuous conduction mode (DCM)?
Yes, the MAX763AESA+ automatically transitions between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) based on input voltage, output voltage, load current, and inductor value. DCM occurs at light loads or high input voltages and is characterized by inductor current falling to zero each cycle - a normal, specified operating condition that the MAX763AESA+ handles without instability or regulation loss.
MAX763AESA+ 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-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX763AESA+ FAQ
1.How can I place an order for MAX763AESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX763AESA+ 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 MAX763AESA+ reliable?
The price and inventory of MAX763AESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX763AESA+ is usually 5 days.
3.What payment methods are accepted for MAX763AESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX763AESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX763AESA+?
MAX763AESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX763AESA+ 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 MAX763AESA+?
For technical support, including MAX763AESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX763AESA+ requirements.
6.How does Aetrix verify that MAX763AESA+ is sourced from the original manufacturer or authorized distributors?
All MAX763AESA+ 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 MAX763AESA+ meets industry standards.
7.What is the process for return or replacement of MAX763AESA+?
All MAX763AESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX763AESA+, 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 MAX763AESA+ part is unused and in its original packaging.
Return procedure for MAX763AESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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