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Analog Devices Inc./Maxim Integrated MAX763ACSA+T
- Part No.:
- MAX763ACSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX763ACSA+T.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,994
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Product details
Overview
The MAX763ACSA+T from Maxim Integrated is a 3.3V-output, current-mode PWM step-down DC-DC converter in an 8-pin SO package, accepting 3.3V–11V input and delivering up to 500mA load current with 85%–90% efficiency, ±5% output voltage accuracy, and 1.4mA quiescent supply current - used in portable instrumentation and handheld computing power rails.
For engineers reviewing the MAX763ACSA+T datasheet, MAX763ACSA+T pinout, MAX763ACSA+T application, or MAX763ACSA+T equivalent, key selection criteria include input voltage range (3.3V–11V), guaranteed 3.3V output regulation under line/load/temperature variation, shutdown current (0.2µA), fixed-frequency PWM operation (159–212.5kHz), and compatibility with standard 22µH inductors and low-ESR output capacitors.
Technical Context
This IC implements a buck topology using current-mode PWM control with inner-cycle current sensing and outer-voltage feedback loop. It integrates a P-channel power MOSFET switch, 1.23V bandgap reference, oscillator, soft-start clamp, and undervoltage lockout circuitry - enabling precise regulation without external compensation complexity.
Operation supports both continuous and discontinuous conduction modes depending on input voltage, load, and inductor value. Soft-start is programmable via external capacitor on SS pin; overcurrent protection triggers at ~1.2A peak inductor current, while UVLO activates below 2.7V (falling) and releases above 2.95V (rising).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±5% over line, load, and temperature - ensures stable logic rail for 3.3V microcontrollers and peripherals. |
| Input Voltage Range | 3.3V to 11V - compatible with single-cell Li-ion (fully charged), dual-cell NiMH, or regulated 5V/9V supplies. |
| Max Output Current | 500mA at VIN ≥ 4.75V - sufficient for moderate-power digital subsystems without external boost stages. |
| Switching Frequency | 159kHz to 212.5kHz - enables predictable EMI filtering and use of compact 22µH inductors with minimal magnetics design effort. |
| Quiescent Current | 1.4mA typical - balances light-load efficiency and fast transient response in battery-powered systems. |
| Shutdown Current | 0.2µA typical - extends battery life during system sleep modes without requiring external load switches. |
| Oscillator Accuracy | ±15% over temperature - supports consistent ripple frequency for downstream filtering without trimming components. |
Pinout & Package
MAX763ACSA+T is housed in an 8-pin SO (Small Outline) package with gull-wing leads, JEDEC MS-012AC compliant, 150°C max junction temperature rating, and RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V+) | Supply Input | DC input (3.3V–11V); requires local 1µF ceramic + bulk electrolytic bypass to GND for stability. |
| 2 (LX) | Switch Node | Drain of internal P-MOSFET; connects to inductor and catch diode anode - high dv/dt node requiring short PCB trace. |
| 3 (GND) | Power Ground | Primary return path for switch current and control circuitry; must connect to low-impedance ground plane. |
| 4 (OUT) | Voltage Sense Input | Feedback node tied directly to regulated 3.3V output; sets regulation point via internal 1.23V reference divider. |
| 5 (CC) | Compensation Input | Connects to OUT via 330pF capacitor - stabilizes outer voltage loop and optimizes transient response. |
| 6 (SS) | Soft-Start Control | Capacitor-to-GND sets startup ramp time and limits inrush current; also enables overcurrent fault recovery. |
| 7 (REF) | Reference Output | 1.23V ±1.5% bandgap source (100µA max); bypassed with 1000pF to GND for noise immunity. |
| 8 (SHDN) | Shutdown Input | Active-low logic control (VIH = 2.0V min, VIL = 0.25V max); pulls output to 0V and disables internal regulator when low. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P-channel MOSFET switch | Eliminates need for external high-side switch and gate driver - reduces BOM count and layout area. |
| Programmable soft-start | External capacitor on SS pin controls startup slew rate and prevents input voltage sag during power-up. |
| Cycle-by-cycle current limiting | Monitors switch current in real time to prevent inductor saturation and thermal runaway under overload. |
| Undervoltage lockout (UVLO) | Blocks operation until V+ exceeds 2.95V and holds off until V+ rises above threshold - avoids brownout instability. |
| Fixed-frequency PWM architecture | Enables predictable EMI spectrum and simplifies output filter design with standard 22µH inductors. |
Applications
| Portable Instrumentation Power Supply | Handheld Computer Core Rail |
|---|---|
|
Use Scenario: Battery-powered multimeters and data loggers requiring clean, stable 3.3V for ADCs, microcontrollers, and LCD drivers. IC Role / Device Role / Timing Role: Primary step-down regulator converting 7.2V NiMH or 8.4V Li-ion pack to regulated 3.3V system rail. Use Value: 85%–90% efficiency extends runtime; 0.2µA shutdown current preserves battery charge during standby. |
Use Scenario: Compact PDAs and ruggedized tablets needing efficient conversion from 5V USB or 7.4V Li-Po to 3.3V logic domain. IC Role / Device Role / Timing Role: Buck converter supplying core voltage to ARM-based SoC and memory interfaces. Use Value: ±5% output accuracy ensures reliable digital operation across temperature; 1.4mA quiescent current minimizes idle drain. |
| Cellular Phone Baseband Supply | Computer Peripheral Interface Rail |
|
Use Scenario: Power management in legacy GSM/GPRS handsets where space-constrained PCBs demand integrated solutions. IC Role / Device Role / Timing Role: Secondary regulator deriving 3.3V from main 5V or 3.7V battery rail for baseband processor and RF front-end biasing. Use Value: Fixed 159–212.5kHz switching allows deterministic noise placement away from cellular bands; 22µH inductor simplifies layout. |
Use Scenario: USB-connected devices like card readers or docking stations requiring isolated 3.3V for interface logic and EEPROM. IC Role / Device Role / Timing Role: Point-of-load regulator converting host-supplied 5V to 3.3V for USB PHY and controller ICs. Use Value: Cycle-by-cycle current limiting protects against short-circuited cables or hot-plug transients; UVLO prevents erratic behavior during USB enumeration. |
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 |
|---|---|---|---|
| LM2674MX-3.3/NOPB | 5V–40V input range; 300mA max output; 52kHz fixed frequency; no integrated P-FET (external switch required) | Higher input voltage capability but lower output current and less integration - suited for industrial 24V systems, not portable 3.3V rails | Select only if input exceeds 11V or cost sensitivity outweighs size/efficiency trade-offs |
| TPS62231DRVR | 2.05V–6.5V input; 600mA output; 3.5MHz synchronous switching; 17µA quiescent current; requires external inductor/capacitors | Higher frequency enables smaller passives but narrower input range - ideal for ultra-compact designs powered by single Li-ion cells | Prefer when board space is critical and input stays within 2.05V–6.5V; avoid if >11V input or 0.2µA shutdown is mandatory |
Compared with LM2674MX-3.3/NOPB and TPS62231DRVR, the MAX763ACSA+T offers optimal balance of input flexibility (3.3V–11V), integrated P-FET, and ultra-low shutdown current - making it uniquely suitable for mid-range portable electronics where battery life and component count are both critical.
Availability
MAX763ACSA+T is available at Aetrix Electronics and suitable for portable instrumentation, handheld computing, cellular phone baseband supplies, computer peripheral interface rails, and battery-powered embedded systems requiring stable component supply with long-term lifecycle support.
Supply support for MAX763ACSA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX763A series was designed specifically for compact, efficient 3.3V step-down conversion in battery-powered portable equipment - emphasizing low quiescent current, integrated power switch, and simplified external component requirements.
FAQ
What is the maximum input voltage supported by the MAX763ACSA+T?
The MAX763ACSA+T supports a maximum input voltage of +12V (absolute maximum rating), with guaranteed operation up to 11V across its specified temperature range. Exceeding 11V may cause premature UVLO activation or reduced efficiency, and operation above +12V risks permanent damage per absolute maximum ratings.
Does the MAX763ACSA+T require an external MOSFET for operation?
No, the MAX763ACSA+T integrates a P-channel power MOSFET switch internally - eliminating the need for any external switching transistor. The LX pin connects directly to the inductor and catch diode, and the device operates as a complete buck regulator with only passive external components required.
Can the MAX763ACSA+T be used with a 3.3V input to generate a 3.3V output?
No - the MAX763ACSA+T is a step-down (buck) converter and cannot regulate when input equals output. Minimum functional input is approximately 3.6V to maintain regulation at full load due to dropout constraints; operation below 4.0V is only guaranteed for light loads (<300mA) per typical characteristics graphs.
What is the purpose of the REF pin on the MAX763ACSA+T?
The REF pin outputs a precision 1.23V ±1.5% bandgap reference voltage, capable of sourcing up to 100µA. It must be bypassed to GND with a 1000pF capacitor to ensure stability and noise immunity. This reference is used internally for output voltage regulation and is not intended for external circuit biasing.
How does the soft-start function work on the MAX763ACSA+T?
The MAX763ACSA+T implements soft-start via an external capacitor connected between the SS pin and GND. Charging this capacitor ramps the current-limit threshold gradually, controlling output voltage rise time and limiting inrush current. Typical values are 0.047µF (≈4ms start time), and the same capacitor enables automatic recovery from overcurrent faults.
Is the MAX763ACSA+T pin-compatible with the MAX748A series?
No - although both share identical pin numbering and functions in 8-pin packages, the MAX763ACSA+T and MAX748A differ in absolute maximum input voltage (12V vs. 17V), LX voltage swing limits, and internal current-sense thresholds. Substituting one for the other without verifying operating conditions may result in failure or degraded performance.
MAX763ACSA+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-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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX763ACSA+T FAQ
1.How can I place an order for MAX763ACSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX763ACSA+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 MAX763ACSA+T reliable?
The price and inventory of MAX763ACSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX763ACSA+T is usually 5 days.
3.What payment methods are accepted for MAX763ACSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX763ACSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX763ACSA+T?
MAX763ACSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX763ACSA+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 MAX763ACSA+T?
For technical support, including MAX763ACSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX763ACSA+T requirements.
6.How does Aetrix verify that MAX763ACSA+T is sourced from the original manufacturer or authorized distributors?
All MAX763ACSA+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 MAX763ACSA+T meets industry standards.
7.What is the process for return or replacement of MAX763ACSA+T?
All MAX763ACSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX763ACSA+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 MAX763ACSA+T part is unused and in its original packaging.
Return procedure for MAX763ACSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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