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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:302
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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 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 0.2µA shutdown supply current. It is used in portable instrumentation and handheld computers requiring compact, efficient 5V-to-3.3V conversion.
For engineers reviewing the MAX763ACSA+ datasheet, MAX763ACSA+ pinout, MAX763ACSA+ application, or MAX763ACSA+ equivalent, key selection criteria include input voltage range (3.3V–11V), guaranteed 500mA output at 3.3V, 159kHz–212.5kHz fixed-frequency switching, cycle-by-cycle current limiting, and soft-start programmability via external capacitor.
Technical Context
This IC implements a buck topology with internal P-channel MOSFET switch, current-mode PWM control, and dual-loop feedback: inner current loop for cycle-by-cycle limiting and outer voltage loop for regulation via error amplifier and REF pin (1.23V bandgap). The oscillator operates at 159–212.5kHz over temperature with 0.04%/°C stability.
Protection features include undervoltage lockout (2.7V turn-off, 2.95V turn-on), programmable soft-start (capacitor on SS pin), overcurrent limiting (~1.2A peak), and thermal-safe operation up to +85°C. Shutdown is active-low on SHDN pin, disabling output and reducing supply current to 0.2µA.
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 - supports single-cell Li-ion (4.2V), dual-cell NiMH (3.0V–3.6V), and regulated 5V/9V rails. |
| Max Output Current | 500mA continuous - sufficient for microcontrollers, FPGAs, and peripheral ICs in portable systems. |
| Switching Frequency | 159kHz to 212.5kHz - enables use of small 22µH inductor and simplifies EMI filtering. |
| Efficiency | 85%–90% at 100–300mA - minimizes thermal rise and extends battery life in handheld devices. |
| Shutdown Current | 0.2µA typical - preserves battery charge during system sleep modes. |
| Quiescent Supply Current | 1.4mA at no load - low bias current improves light-load efficiency vs. older buck controllers. |
Pinout & Package
MAX763ACSA+ is housed in an 8-pin SO (Small Outline) package, surface-mount, with 1.27mm pitch and standard JEDEC MS-012AC footprint. All pins are electrically defined per the MAX763A functional specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Supply Input | Bypassed with 1µF ceramic + bulk electrolytic; accepts 3.3V–11V; absolute max +12V. |
| LX | Switch Node | Drain of internal P-MOSFET; connects to inductor and catch diode anode; voltage swings from GND to V+. |
| GND | Power Ground | Common return for input/output capacitors, inductor, and diode; must be low-inductance plane. |
| OUT | Voltage Sense Input | Feedback node tied directly to 3.3V output; enables precise regulation without external resistor network. |
| CC | Compensation Input | Connects to OUT via 330pF capacitor; stabilizes outer voltage loop and optimizes transient response. |
| SS | Soft-Start Control | Capacitor to GND sets startup ramp time and limits inrush; also triggers discharge during overcurrent/UVLO. |
| REF | Reference Output | 1.23V ±3% bandgap reference; supplies ≤100µA; bypassed with 1000pF to GND for noise immunity. |
| SHDN | Shutdown Enable | Active-low logic input; pulls output to 0V and disables internal circuitry when grounded; VIH ≥2.0V, VIL ≤0.25V. |
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 complexity. |
| Fixed 3.3V output with ±5% accuracy | Guaranteed across full operating range - removes trimming requirement and simplifies qualification testing. |
| Programmable soft-start via SS pin | 0.047µF capacitor yields ~4ms ramp - prevents inrush current damage to input source and output capacitors. |
| Cycle-by-cycle current limiting | Monitors switch current each cycle to clamp peak inductor current - ensures safe operation under short-circuit or overload. |
| Undervoltage lockout (UVLO) | Enables only above 2.95V and disables below 2.7V - prevents erratic operation during brownout or battery depletion. |
| 22µH prequalified inductor support | Validated with off-the-shelf 22µH inductors (e.g., Coilcraft CTX-220); eliminates custom magnetics design effort. |
Applications
| Portable Instrumentation | Hand-Held Computers |
|---|---|
Use Scenario: Battery-powered multimeters, data loggers, and handheld oscilloscopes requiring clean 3.3V for ADCs, microcontrollers, and displays. IC Role / Device Role / Timing Role: Primary 5V-to-3.3V buck regulator supplying core logic and analog front-end circuits. Use Value: 85%–90% efficiency extends battery runtime; ±5% output tolerance ensures ADC reference stability and MCU clock integrity. |
Use Scenario: Ruggedized PDAs and industrial tablets powered by Li-ion packs (3.0V–4.2V) needing regulated 3.3V for memory, touch controller, and wireless modules. IC Role / Device Role / Timing Role: Main system power rail converter enabling low-noise operation in space-constrained PCB layouts. Use Value: Fixed-frequency 159–212.5kHz switching allows predictable EMI filtering; 0.2µA shutdown current preserves charge during long idle periods. |
| Cellular Phones | Computer Peripherals |
Use Scenario: Feature phones and early smartphones using 3.3V for baseband processors, SIM interface, and audio codecs. IC Role / Device Role / Timing Role: Secondary power stage converting main 5V USB or battery-derived rail to 3.3V I/O domain. Use Value: Cycle-by-cycle current limiting protects against shorted antenna lines or faulty RF modules; soft-start prevents reset glitches during power-up. |
Use Scenario: USB hubs, docking stations, and external storage enclosures drawing from 5V USB bus or AC adapter. IC Role / Device Role / Timing Role: Standalone 3.3V supply for USB PHY, flash memory, and status LEDs. Use Value: 8-pin SO package enables compact 2-layer PCB designs; 1.4mA quiescent current meets USB suspend mode requirements. |
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 synchronous buck, 3.3V fixed, 400mA max, 2.05V–6.5V input, 17µA IQ | Higher frequency enables smaller inductors/caps but lower max current and narrower input range | Prefer for ultra-compact designs where size > current capability; not suitable for 9V input or 500mA loads. |
| LM2674MX-3.3/NOPB | 100kHz nonsynchronous buck, 3.3V fixed, 500mA max, 4.75V–20V input, 2.5mA IQ | Wider input range and same current rating, but lower efficiency (~80%) and no soft-start or UVLO | Prefer for cost-sensitive industrial applications with 12V input; requires external soft-start circuit if needed. |
Compared with TPS62231DRVR and LM2674MX-3.3/NOPB, the MAX763ACSA+ uniquely balances 500mA capability, 3.3V–11V input flexibility, integrated protection (UVLO, soft-start, cycle-by-cycle limit), and SO-8 footprint-making it optimal for portable equipment where reliability, efficiency, and ease of implementation are critical.
Availability
MAX763ACSA+ is available at Aetrix Electronics and suitable for portable instrumentation, hand-held computers, and cellular phone power management requiring stable component supply, consistent parametric performance, and long-term production continuity.
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, communications, and consumer applications.
The MAX763A belongs to Maxim's legacy high-efficiency DC-DC converter product line, designed specifically for compact, battery-operated systems needing reliable 3.3V regulation from variable-input sources like batteries or unregulated adapters.
FAQ
What is the maximum input voltage rating for the MAX763ACSA+?
The MAX763ACSA+ has an absolute maximum input voltage of +12V on the V+ pin. Its operational input range is specified as 3.3V to 11V - exceeding 11V may cause premature UVLO disable or reduced lifetime. For robust 12V system integration, consider the MAX748A variant, rated up to 16V input.
Does the MAX763ACSA+ require an external feedback resistor network?
No, the MAX763ACSA+ provides a fixed 3.3V output and does not require external feedback resistors. The OUT pin connects directly to the regulated output node for sensing, and internal trimming ensures ±5% accuracy across temperature and load - eliminating resistor matching, drift, and layout sensitivity.
Can the MAX763ACSA+ operate with a 3.0V input supply?
The MAX763ACSA+ is not guaranteed to regulate at 3.0V input: its minimum operational input is 3.3V, and undervoltage lockout disables switching below ~2.7V. At 3.0V, the device remains in UVLO state with no output. For sub-3.3V inputs, consider low-dropout regulators or boost-buck architectures instead.
What is the purpose of the REF pin on the MAX763ACSA+?
REF is a buffered 1.23V ±3% bandgap reference output capable of sourcing up to 100µA. It is used to bias external circuitry (e.g., precision comparators or sensor excitation) and must be bypassed to GND with a 1000pF capacitor to ensure stability and low noise - not for feedback or regulation.
How is soft-start configured on the MAX763ACSA+?
Soft-start is configured by connecting a capacitor between the SS pin and GND. A 0.047µF capacitor yields ~4ms startup ramp time and also enables overcurrent protection. The SS pin controls both inrush current limiting and fault recovery - discharging automatically during UVLO or overcurrent events to prevent latch-up.
MAX763ACSA+ 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:
- 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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