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Analog Devices Inc./Maxim Integrated MAX763AESA-TG068
- Part No.:
- MAX763AESA-TG068
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX763AESA-TG068.pdf
- Description:
- 3.3V, STEP-DOWN, CURRENT-MODE PW
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
MAX763AESA-TG068 from Maxim Integrated is a 3.3V-output, current-mode PWM step-down DC-DC converter optimized for 3.3V-to-3.3V regulation from 3.3V–11V input sources. It delivers up to 500mA load current with 85%–90% efficiency, 1.4mA quiescent supply current, and 0.2µA shutdown current. It operates in fixed-frequency mode (159–212.5kHz) and supports programmable soft-start via external capacitor - widely used in portable instrumentation and handheld computing power rails.
For engineers reviewing the MAX763AESA-TG068 datasheet, MAX763AESA-TG068 pinout, MAX763AESA-TG068 application, or MAX763AESA-TG068 equivalent, key selection criteria include input voltage range (3.3V–11V), guaranteed ±5% output voltage accuracy over line/load/temperature, cycle-by-cycle current limiting, undervoltage lockout (2.7V fall, 2.95V rise), and compatibility with standard 22µH inductors and low-ESR output capacitors.
Technical Context
The MAX763AESA-TG068 implements a current-mode PWM buck regulator architecture with dual feedback loops: an inner current-sense loop enabling cycle-by-cycle current limiting at ~1.2A peak, and an outer voltage loop using a 1.23V internal bandgap reference (±50ppm/°C drift) and error amplifier. Its oscillator is trimmed to operate between 159kHz and 212.5kHz across temperature and supply voltage.
It integrates a P-channel power MOSFET switch with 1.0Ω typical on-resistance and includes dedicated pins for soft-start timing (SS), compensation (CC), reference output (REF), and active-low shutdown (SHDN). Undervoltage lockout disables switching below 2.7V and re-enables at ~2.95V, while short-circuit protection triggers SS discharge upon fault detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±5% over line, load (0–500mA), and temperature (−40°C to +85°C) |
| Input Voltage Range | 3.3V to 11.0V - supports single-cell Li-ion, 5V rail derating, and regulated wall adapters |
| Switching Frequency | 159kHz to 212.5kHz - enables predictable EMI filtering and use of compact 22µH inductors |
| Load Current | Up to 500mA continuous - guaranteed at V+ ≥ 4.75V; reduced at lower inputs per output voltage vs. supply curve |
| Quiescent Current | 1.4mA typical - enables low-power operation in battery-backed systems without disabling regulation |
| Shutdown Current | 0.2µA typical - ensures negligible battery drain during system sleep or standby modes |
| Line Regulation | 0.13%/V - maintains tight output stability despite input rail sag or ripple |
| Undervoltage Lockout | 2.7V (falling), 2.95V (rising) - prevents erratic startup and MOSFET partial turn-on during brownout |
Pinout & Package
MAX763AESA-TG068 is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with 1.27mm pitch and exposed pad not electrically connected. Pin functions are validated per Maxim's official pin configuration diagrams and electrical characteristics tables.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Supply Input | Bypassed with 1µF ceramic + bulk electrolytic; max rating +12V, −0.3V; substrate connection |
| LX | Switch Node | Drain of internal P-MOSFET; swings from (V+ −12V) to (V+ +0.3V); connects to inductor and catch diode anode |
| GND | Power Ground | Reference for all internal circuits; requires low-inductance connection to input/output capacitor grounds |
| OUT | Feedback Sense | Connects directly to regulated 3.3V output; closes voltage regulation loop via internal error amplifier |
| CC | Compensation Input | External 330pF capacitor to OUT sets outer-loop stability; enables wide input range and fast transient response |
| SS | Soft-Start Control | Capacitor to GND (e.g., 0.047µF) controls startup ramp time and limits inrush; also enables short-circuit protection |
| REF | Reference Output | Stable 1.23V ±50ppm/°C bandgap source; supplies ≤100µA; bypassed with 1000pF to GND |
| SHDN | Shutdown Enable | Active-low logic input; <0.25V = shutdown (0.2µA IQ); >2.0V = normal operation; pulls REF low when asserted |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables precise cycle-by-cycle current limiting (~1.2A), improved load-transient response, and simplified loop compensation |
| Fixed 3.3V output | No external resistive divider required - reduces BOM count and improves accuracy vs. adjustable regulators |
| Programmable soft-start | SS pin accepts 0.01–0.47µF capacitor to control startup time (1–12ms typical) and prevent output overshoot/inrush |
| Integrated protection suite | Includes undervoltage lockout, overcurrent limiting, and automatic SS-initiated fault recovery - no external supervision IC needed |
| Prequalified magnetics support | Guaranteed performance with standard 22µH inductor (≥1A saturation rating); eliminates custom magnetics design effort |
| Low-noise fixed-frequency operation | 159–212.5kHz switching enables deterministic EMI filtering and avoids audible noise in sensitive analog/audio subsystems |
Applications
| Portable Instrumentation Power | Hand-Held Computing Rails |
|---|---|
Use Scenario: Battery-powered multimeters, data loggers, and portable oscilloscopes requiring stable 3.3V for microcontrollers and ADCs. IC Role / Device Role / Timing Role: Primary step-down regulator converting 3.7V Li-ion or 5V USB input to clean 3.3V system rail. Use Value: 85–90% efficiency extends battery life; 0.2µA shutdown current preserves charge during long idle periods. |
Use Scenario: PDAs, rugged tablets, and handheld terminals needing robust 3.3V supply under variable load and thermal conditions. IC Role / Device Role / Timing Role: Core power management IC delivering regulated 3.3V to ARM-based SoCs and display interfaces. Use Value: ±5% output accuracy ensures reliable digital logic operation; programmable soft-start prevents reset glitches during wake-up. |
| Cellular Phone Baseband | Computer Peripheral Regulation |
Use Scenario: Powering baseband processors and RF front-end bias in legacy 2G/3G handsets operating from single-cell Li-ion. IC Role / Device Role / Timing Role: Secondary DC-DC stage stepping down 4.2V battery or 5V PMIC rail to 3.3V I/O and memory interface supply. Use Value: Cycle-by-cycle current limiting protects against shorted PCB traces or failed downstream components during field use. |
Use Scenario: External HDD enclosures, USB hubs, and docking stations requiring efficient 3.3V for controller ICs and PHYs. IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter replacing linear regulators to reduce heat and improve thermal margin. Use Value: Fixed-frequency operation simplifies compliance testing; 22µH inductor compatibility lowers sourcing complexity and cost. |
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 |
|---|---|---|---|
| MAX764AESA+ | Same 8-pin SO package; 5V fixed output; 3.3V–16V input; 1.7mA IQ; 159–212.5kHz frequency | Designed for 5V systems; not drop-in for 3.3V rails without output rework | Select only if upgrading to 5V logic or interfacing with 5V peripherals; requires layout revision |
| TPS62231DRVR | 3.3V fixed output; 2.05V–6.5V input; 1.5MHz switching; 25µA IQ; 6-pin WSON package | Higher frequency enables smaller passives but increases EMI sensitivity; narrower input range | Prefer for space-constrained designs with ultra-low IQ needs; verify EMI filtering and thermal performance at 1.5MHz |
Compared with MAX763AESA-TG068, MAX764AESA+ offers higher input voltage tolerance but mismatched output voltage, while TPS62231DRVR provides superior quiescent current and footprint but sacrifices input range and introduces high-frequency layout challenges.
Availability
MAX763AESA-TG068 is available at Aetrix Electronics and suitable for portable instrumentation, handheld computing, cellular phone baseband, and computer peripheral applications requiring stable component supply, extended temperature operation (−40°C to +85°C), and long-term industrial lifecycle support.
Supply support for MAX763AESA-TG068 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-TG068 belongs to Maxim's legacy high-efficiency DC-DC converter product line, engineered specifically for compact, battery-sensitive applications demanding reliable 3.3V regulation from wide-input unregulated sources.
FAQ
What is the maximum input voltage supported by the MAX763AESA-TG068?
The MAX763AESA-TG068 supports a maximum input voltage of +12V (absolute maximum rating), with guaranteed operation up to 11.0V across its full temperature range. Exceeding 11.0V may cause undefined behavior or damage, and the device incorporates undervoltage lockout that activates below 2.7V to prevent malfunction during brownout conditions. The MAX763AESA-TG068 datasheet specifies 3.3V–11.0V as the functional input range.
Does the MAX763AESA-TG068 require external feedback resistors to set output voltage?
No, the MAX763AESA-TG068 features a factory-trimmed fixed 3.3V output and does not require external feedback resistors. Its internal voltage divider and 1.23V reference are laser-trimmed to deliver ±5% output accuracy over line, load, and temperature. This eliminates resistor matching errors and reduces component count compared to adjustable buck controllers - a key design advantage of the MAX763AESA-TG068.
Can the MAX763AESA-TG068 be used with a 22µH inductor only, or are other values acceptable?
The MAX763AESA-TG068 is fully characterized and guaranteed to meet all specifications - including 500mA output, 85–90% efficiency, and stability - using a standard 22µH inductor with ≥1A saturation current. While other values may function, deviation risks violating guaranteed performance: lower inductance increases peak current and ripple; higher inductance degrades transient response and may cause discontinuous conduction. The MAX763AESA-TG068 design intentionally avoids inductor customization.
What is the purpose of the REF pin on the MAX763AESA-TG068, and how should it be used?
The REF pin on the MAX763AESA-TG068 provides a stable 1.23V ±50ppm/°C bandgap reference voltage, capable of sourcing up to 100µA for external circuitry such as precision comparators or sensor biasing. It must be bypassed to GND with a 1000pF capacitor to ensure stability and low noise. During shutdown, REF is disabled - a behavior confirmed in the MAX763AESA-TG068 electrical characteristics table and functional description.
How does the soft-start function work on the MAX763AESA-TG068, and what capacitor value is recommended?
The MAX763AESA-TG068 uses the SS pin to implement programmable soft-start: an external capacitor (e.g., 0.047µF) between SS and GND controls the ramp rate of the current-limit threshold, preventing inrush current and output overshoot. Typical soft-start times range from 1ms (0.01µF) to 12ms (0.47µF) depending on input voltage and load. The MAX763AESA-TG068 also reinitiates soft-start automatically after undervoltage or overcurrent faults.
MAX763AESA-TG068 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX763AESA-TG068 FAQ
1.How can I place an order for MAX763AESA-TG068 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX763AESA-TG068 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-TG068 reliable?
The price and inventory of MAX763AESA-TG068 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX763AESA-TG068 is usually 5 days.
3.What payment methods are accepted for MAX763AESA-TG068?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX763AESA-TG068 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX763AESA-TG068?
MAX763AESA-TG068 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX763AESA-TG068 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-TG068?
For technical support, including MAX763AESA-TG068 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX763AESA-TG068 requirements.
6.How does Aetrix verify that MAX763AESA-TG068 is sourced from the original manufacturer or authorized distributors?
All MAX763AESA-TG068 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-TG068 meets industry standards.
7.What is the process for return or replacement of MAX763AESA-TG068?
All MAX763AESA-TG068 units undergo pre-shipment inspection (PSI). If there is an issue with MAX763AESA-TG068, 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-TG068 part is unused and in its original packaging.
Return procedure for MAX763AESA-TG068:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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