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Analog Devices Inc./Maxim Integrated MAX763ACSA
- Part No.:
- MAX763ACSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX763ACSA.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,521
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Product details
Overview
The MAX763ACSA from Maxim Integrated is a 3.3V-output, current-mode PWM step-down DC-DC converter IC designed for fixed-voltage regulation in space-constrained portable systems. It accepts 3.3V–11V input, delivers up to 500mA load current, achieves 85%–90% efficiency, and features 1.4mA quiescent current and 0.2µA shutdown current. It is commonly used in handheld computers and cellular phones requiring stable, low-noise 3.3V rails from battery or adapter sources.
For engineers reviewing the MAX763ACSA datasheet, MAX763ACSA pinout, MAX763ACSA application, or MAX763ACSA equivalent, key selection considerations include its 8-pin SO package, guaranteed ±5% output voltage accuracy over line/load/temperature, 159kHz–219.5kHz oscillator frequency range, integrated P-channel MOSFET switch, and programmable soft-start via external capacitor.
Technical Context
The MAX763ACSA implements a current-mode PWM buck regulator architecture with dual feedback loops: an inner current-sense loop enabling cycle-by-cycle current limiting (trip point ~1.2A), and an outer voltage loop using a 1.23V internal bandgap reference (±50ppm/°C drift) and error amplifier. Its fixed-frequency operation (159–219.5kHz) simplifies EMI filtering and supports use of a prequalified 22µH inductor without custom magnetics design.
Protection features include undervoltage lockout (2.7V turn-off, 2.95V turn-on), active soft-start (capacitor-programmable), overcurrent limiting, and thermal-safe shutdown. The device operates in continuous conduction mode up to 500mA at typical input voltages and transitions to discontinuous mode under light loads or higher VIN, with no external compensation required beyond the specified 330pF CC-to-OUT capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±5% over line, load, and temperature - ensures stable logic supply without external resistive divider. |
| Input Voltage Range | 3.3V to 11V - compatible with single-cell Li-ion (fully charged), 5V USB, or regulated 9V adapters. |
| Max Output Current | 500mA at VIN ≥ 4.75V - sufficient for microcontrollers, RF modules, and low-power peripherals. |
| Oscillator Frequency | 159kHz to 219.5kHz - enables predictable ripple frequency and compact LC filter design. |
| Quiescent Current | 1.4mA - minimizes standby power loss in always-on subsystems. |
| Shutdown Current | 0.2µA - preserves battery life during deep sleep modes. |
| Efficiency | 85%–90% at 100–300mA - reduces thermal load and extends runtime in portable applications. |
Pinout & Package
MAX763ACSA is housed in an 8-pin SO (Small Outline) package, surface-mount, RoHS-compliant, with standard 1.27mm pitch and JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V+) | Power Input | Primary supply 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) | Ground Reference | Power and signal ground return; requires low-inductance connection to input/output capacitors. |
| 4 (OUT) | Voltage Sense Input | Feedback node tied directly to regulated 3.3V output; sets regulation point via internal 1.23V reference. |
| 5 (CC) | Compensation Input | Connects to OUT via 330pF capacitor to stabilize voltage-loop response and ensure stability across load conditions. |
| 6 (SS) | Soft-Start Control | Capacitor-to-ground (e.g., 0.047µF) programs startup ramp time and limits inrush current during power-up. |
| 7 (REF) | Reference Output | Provides 1.23V ±1.5% bandgap reference (100µA max sink); bypassed with 1000pF to GND for noise immunity. |
| 8 (SHDN) | Shutdown Enable | Active-low digital control: tie to GND for 0.2µA shutdown, to V+ for normal operation; initiates soft-start on wake-up. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P-channel MOSFET switch | Eliminates need for external high-side switch; reduces BOM count and layout complexity. |
| Prequalified 22µH inductor support | Removes magnetics design effort; guarantees full 500mA performance with off-the-shelf inductors. |
| Cycle-by-cycle current limiting | Hardware-based protection triggers at ~1.2A peak switch current, preventing damage during short-circuit events. |
| Programmable soft-start | External capacitor sets controlled output ramp rate, avoiding input rail sag and downstream reset issues. |
| Undervoltage lockout (UVLO) | Prevents erratic operation below 2.7V; ensures clean start-up only when input exceeds 2.95V. |
Applications
| Handheld Computing Power Supply | Cellular Phone Baseband Core |
|---|---|
|
Use Scenario: Powering ARM-based application processors and memory in PDAs or ruggedized tablets operating from single-cell Li-ion batteries (3.0V–4.2V). IC Role / Device Role / Timing Role: Primary 3.3V step-down regulator delivering up to 500mA with tight output regulation and low quiescent current during sleep states. Use Value: Enables >10-hour battery life in active use and <1µA system standby leakage when combined with MAX763ACSA shutdown mode. |
Use Scenario: Supplying core logic voltage to baseband ICs in 2G/3G feature phones where input varies between 3.4V (discharged battery) and 4.4V (USB charging). IC Role / Device Role / Timing Role: Fixed-output buck converter providing stable 3.3V rail with fast transient response to handle burst-mode RF transmission current spikes. Use Value: Maintains ±5% output accuracy across 3.3V–11V input and 0–500mA load, ensuring reliable digital logic operation without external supervision. |
| Portable Instrumentation Sensor Interface | Computer Peripheral Logic Rail |
|
Use Scenario: Powering precision analog front-ends and low-power microcontrollers in handheld multimeters or gas detectors powered by alkaline or NiMH cells. IC Role / Device Role / Timing Role: Efficient 3.3V source with low output ripple (<50mVp-p) and minimal EMI, critical for ADC reference stability. Use Value: Achieves 88% efficiency at 300mA with 22µH inductor and 150µF OS-CON output capacitor, reducing self-heating in sealed enclosures. |
Use Scenario: Generating 3.3V for USB-to-serial bridges, SD card controllers, or LED drivers in docking stations and external storage enclosures. IC Role / Device Role / Timing Role: Compact, drop-in replacement for aging linear regulators-reducing heat dissipation and enabling smaller heatsinks or fanless designs. Use Value: Delivers 500mA at 3.3V from 5V USB input with only 1.4mA quiescent draw, eliminating thermal derating concerns in dense PCB layouts. |
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 | 3MHz fixed-frequency synchronous buck; 0.6V–5.5V adjustable output; 300mA rated; 17µA IQ. | Better suited for ultra-low-IQ battery applications but lacks integrated soft-start programming and fixed 3.3V option. | Select if adjustable output or higher switching frequency (smaller inductors) is prioritized over guaranteed 3.3V accuracy and programmable SS. |
| LM2674MX-3.3 | 100kHz non-synchronous buck; 4.75V–40V input; 500mA; 2.5mA IQ; requires external N-MOSFET and diode. | Higher input voltage range supports industrial 24V rails but increases component count and reduces efficiency vs. MAX763ACSA. | Choose only when input exceeds 11V or extended temperature range (-40°C to +125°C) is required beyond MAX763ACSA's 0°C to +70°C rating. |
Compared with TPS62231DRVR and LM2674MX-3.3, the MAX763ACSA offers a unique balance of fixed 3.3V output, integrated P-MOSFET, programmable soft-start, and guaranteed ±5% regulation - making it optimal for cost-sensitive, space-constrained portable designs where input stays within 3.3V–11V and simplicity is critical.
Availability
MAX763ACSA is available at Aetrix Electronics and suitable for handheld computing, cellular phone baseband, portable instrumentation, and computer peripheral applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX763ACSA 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, communications, and consumer markets.
The MAX763A series was developed specifically for compact, efficient 3.3V point-of-load conversion in battery-powered portable electronics - emphasizing low quiescent current, integrated protection, and minimal external component count.
FAQ
What is the maximum input voltage supported by the MAX763ACSA?
The MAX763ACSA supports a maximum input voltage of +12V (absolute maximum rating), with guaranteed operation up to 11V across the commercial temperature range (0°C to +70°C). Exceeding 11V may trigger undervoltage lockout or cause reliability degradation; operation above 12V risks permanent damage per absolute maximum ratings.
Does the MAX763ACSA require external compensation components?
Yes, the MAX763ACSA requires a 330pF capacitor between the CC pin and the OUT pin to stabilize the voltage feedback loop. This capacitor is mandatory for stable regulation across all load conditions and input voltages; omitting it results in oscillation or poor transient response. No additional RC network is needed.
Can the MAX763ACSA be used with a 3.0V input supply?
The MAX763ACSA can accept 3.0V input, but regulation is not guaranteed below 3.3V. Per the Output Voltage vs. Supply Voltage graph, output drops below 3.3V at VIN < 3.3V, and undervoltage lockout disables switching below ~2.7V. For reliable 3.3V output, VIN must remain ≥3.3V - e.g., fully charged Li-ion (4.2V) or regulated 5V sources.
What is the purpose of the REF pin on the MAX763ACSA?
The REF pin on the MAX763ACSA provides a buffered 1.23V ±1.5% bandgap reference voltage, capable of sourcing/sinking up to 100µA. It is used internally for output regulation and may drive external circuitry (e.g., ADC references), but must be bypassed to GND with a 1000pF capacitor to suppress noise and ensure stability of the internal error amplifier.
How does the soft-start function work on the MAX763ACSA?
The MAX763ACSA implements soft-start via an external capacitor on the SS pin. Charging this capacitor (e.g., 0.047µF) linearly ramps the current-limit threshold, controlling output voltage rise time and limiting inrush current. An SS cycle also activates automatically after power-up, shutdown exit, or fault recovery - ensuring orderly startup without output overshoot or input rail collapse.
MAX763ACSA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX763ACSA FAQ
1.How can I place an order for MAX763ACSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX763ACSA 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 reliable?
The price and inventory of MAX763ACSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX763ACSA is usually 5 days.
3.What payment methods are accepted for MAX763ACSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX763ACSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX763ACSA?
MAX763ACSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX763ACSA 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?
For technical support, including MAX763ACSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX763ACSA requirements.
6.How does Aetrix verify that MAX763ACSA is sourced from the original manufacturer or authorized distributors?
All MAX763ACSA 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 meets industry standards.
7.What is the process for return or replacement of MAX763ACSA?
All MAX763ACSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX763ACSA, 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 part is unused and in its original packaging.
Return procedure for MAX763ACSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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