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Analog Devices Inc./Maxim Integrated MAX763ACSA-TG068
- Part No.:
- MAX763ACSA-TG068
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX763ACSA-TG068.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
MAX763ACSA-TG068 from Maxim Integrated is a 3.3V-output, current-mode PWM step-down DC-DC converter in an 8-pin SO package, supporting 3.3V–11V input and delivering up to 500mA load current with ±5% output voltage accuracy, 159–212.5kHz fixed switching frequency, and 85–90% efficiency. It serves as the primary power conversion stage in battery-powered portable electronics requiring stable low-noise 3.3V rails.
For engineers reviewing the MAX763ACSA-TG068 datasheet, MAX763ACSA-TG068 pinout, MAX763ACSA-TG068 application, or MAX763ACSA-TG068 equivalent, key selection criteria include input voltage range compatibility (≤11V), shutdown current (<0.2µA), soft-start programmability, cycle-by-cycle current limiting, and SO-package thermal performance for compact PCB layouts.
Technical Context
The MAX763ACSA-TG068 implements a buck topology with internal P-channel MOSFET switch and current-mode PWM control, using an inner current loop for cycle-by-cycle peak-current limiting and an outer voltage loop for precise 3.3V regulation via REF (1.23V bandgap) and OUT feedback. Its oscillator operates at 159–212.5kHz over temperature, enabling predictable EMI filtering and small external magnetics.
Undervoltage lockout activates below 2.7V (typ) on V+, preventing partial FET turn-on and thermal stress; shutdown mode disables all circuitry except SHDN input logic, reducing supply current to 0.2µA while discharging the SS capacitor to ensure controlled restart. The 22µH prequalified inductor eliminates custom magnetics design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±5% - guaranteed regulation across line, load (0–500mA), and temperature (0°C to +70°C). |
| Input Voltage Range | 3.3V to 11.0V - supports single-cell Li-ion (4.2V), dual-cell NiMH (2.4–3.0V), and regulated 5V/9V supplies. |
| Switching Frequency | 159–212.5kHz - fixed-frequency PWM enables predictable ripple filtering and avoids audible noise. |
| Max Output Current | 500mA - deliverable with ≥4.75V input; derates to 300mA at 4.0V input per spec limits. |
| Quiescent Current | 1.4mA - enables high light-load efficiency in always-on portable systems. |
| Shutdown Current | 0.2µA - ensures negligible battery drain during system sleep modes. |
| Efficiency | 85–90% - measured at 100–300mA loads with 5V–7V input, minimizing thermal dissipation in sealed enclosures. |
Pinout & Package
MAX763ACSA-TG068 is housed in an 8-pin SO (Small Outline) package with standard JEDEC MS-012AC footprint (body width 3.9mm, lead pitch 1.27mm). Thermal pad not present; power dissipation limited to 471mW at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V+) | Supply Input | Bypassed with 1µF ceramic + bulk electrolytic; max 12V absolute rating. |
| 2 (LX) | Switch Node | Drain of internal P-MOSFET; connects to inductor and catch diode anode. |
| 3 (GND) | Power Ground | Common return for V+, LX, OUT, CC, SS, REF, SHDN; requires low-inductance layout. |
| 4 (OUT) | Voltage Sense Input | Feedback node tied directly to 3.3V output; sets regulation point via internal error amp. |
| 5 (CC) | Compensation Input | Connects to OUT via 330pF capacitor to stabilize voltage-loop response. |
| 6 (SS) | Soft-Start Control | Capacitor-to-GND (e.g., 0.047µF) programs startup ramp time and short-circuit protection threshold. |
| 7 (REF) | Reference Output | 1.23V ±1.5% bandgap source; supplies ≤100µA; bypassed with 1000pF to GND. |
| 8 (SHDN) | Shutdown Input | Active-low logic input; <0.25V = shutdown (0.2µA IQ); >2.0V = active operation. |
Key Features
| Feature | Design Value |
|---|---|
| Prequalified 22µH inductor support | Eliminates custom magnetics design; validated for ≤500mA with <1A saturation current rating. |
| Cycle-by-cycle current limiting | Hardware-based peak-current clamp prevents inductor saturation and MOSFET failure under overload. |
| Programmable soft-start | External SS capacitor controls output voltage ramp rate and sets maximum safe inrush current. |
| Undervoltage lockout (UVLO) | Prevents erratic operation below 2.7V; ensures clean start-up above 2.95V with automatic SS cycle initiation. |
| 0.2µA shutdown supply current | Enables multi-year battery life in maintenance-free IoT sensors and remote monitors. |
Applications
| Cellular Phone Power Management | Hand-Held Computer Core Supply |
|---|---|
Use Scenario: Regulating 5V USB or 7.2V battery to clean 3.3V rail for baseband processor and RF transceiver. IC Role / Device Role / Timing Role: Primary buck regulator providing tightly regulated, low-noise 3.3V supply with fast transient response to burst-mode CPU loads. Use Value: 85–90% efficiency extends talk time; 159–212.5kHz switching avoids interference with GSM/UMTS bands; 0.2µA shutdown preserves standby battery. |
Use Scenario: Converting 9V wall adapter or 3×AA alkaline stack to stable 3.3V for ARM-based application processor and display controller. IC Role / Device Role / Timing Role: Main system DC-DC converter with programmable soft-start to prevent brownout during cold boot. Use Value: 500mA capability supports full-speed CPU operation; UVLO prevents malfunction during battery depletion; SO package enables compact 2-layer PCB layout. |
| Portable Instrument ADC Reference Supply | Computer Peripheral Interface Rail |
Use Scenario: Generating ultra-stable 3.3V for 16-bit SAR ADC reference and precision analog front-end in handheld DMMs or data loggers. IC Role / Device Role / Timing Role: Low-noise, high-PSRR power source decoupled with 1000pF REF bypass and optimized LC filter. Use Value: ±5% output accuracy and <50mVp-p ripple (with 22µH/150µF) preserve ADC ENOB; 1.23V REF enables external precision voltage references. |
Use Scenario: Providing isolated 3.3V for USB 2.0 PHY, SD card interface, or PCIe endpoint logic in docking stations or external storage enclosures. IC Role / Device Role / Timing Role: Secondary buck regulator handling dynamic load steps from hot-plug events and protocol handshaking. Use Value: Fast load-transient response minimizes bus reset errors; cycle-by-cycle current limit protects against shorted connector pins; SO package simplifies automated assembly. |
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 | 3.0–6.5V input, 3.3V fixed output, 400mA max, 2.25MHz switching, 17µA quiescent current. | Higher frequency enables smaller inductors but increases EMI sensitivity; lower input range excludes 9V adapters. | Select when board space is critical and input is strictly ≤6.5V; avoid for wide-input industrial use. |
| LM2675M-3.3 | 4.75–40V input, 3.3V fixed output, 500mA max, 260kHz switching, 5.5mA quiescent current, no soft-start pin. | Wider input supports 24V industrial rails but lacks programmable soft-start and has higher IQ. | Select for high-voltage industrial inputs where soft-start timing is managed externally; verify thermal margin in SO-8. |
Compared with TPS62231DRVR and LM2675M-3.3, the MAX763ACSA-TG068 uniquely balances 3.3V–11V input flexibility, 0.2µA shutdown, and dedicated SS/REF pins for precision analog systems-making it optimal for portable instrumentation and battery-powered communications devices.
Availability
MAX763ACSA-TG068 is available at Aetrix Electronics and suitable for cellular phones, hand-held computers, portable instruments, computer peripherals, and battery-powered IoT edge nodes requiring stable component supply with commercial temperature grade (0°C to +70°C) and SO-packaged reliability.
Supply support for MAX763ACSA-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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and portable applications.
The MAX763A product line delivers highly integrated, low-quiescent-current DC-DC converters optimized for space-constrained, battery-operated systems needing reliable 3.3V regulation without custom magnetics design.
FAQ
What is the absolute maximum input voltage for MAX763ACSA-TG068?
The absolute maximum input voltage on the V+ pin of MAX763ACSA-TG068 is +12V. Exceeding this rating-even momentarily-may cause permanent damage. The recommended operating range is 3.3V to 11.0V, with guaranteed 500mA output only above 4.75V input. Always include transient voltage suppression if interfacing with unregulated sources like automotive batteries or wall adapters.
Does MAX763ACSA-TG068 require an external catch diode?
Yes, MAX763ACSA-TG068 requires an external Schottky or high-speed silicon rectifier (e.g., 1N5817) connected between LX and GND. The IC integrates only the P-channel MOSFET switch-not the freewheeling path-so the diode completes the buck converter's current loop during the off-time. Peak diode current must exceed 1.0A for 500mA load operation.
Can MAX763ACSA-TG068 operate with input voltages below 3.3V?
No, MAX763ACSA-TG068 cannot regulate 3.3V output with input below 3.3V due to its buck topology and minimum dropout constraints. Undervoltage lockout disables operation below ~2.7V, and regulation only begins once V+ exceeds ~3.3V (no load) or higher under load. For sub-3.3V inputs, consider a boost or buck-boost topology instead.
How is soft-start configured on MAX763ACSA-TG068?
Soft-start on MAX763ACSA-TG068 is configured by connecting a capacitor (typically 0.047µF) between the SS pin and GND. This capacitor controls both the output voltage ramp time and the initial current-limit threshold during startup. Larger values increase ramp time and reduce inrush; values below 0.01µF disable overcurrent protection. The SS pin also discharges during UVLO or shutdown events.
What is the purpose of the REF pin on MAX763ACSA-TG068?
The REF pin on MAX763ACSA-TG068 outputs a precision 1.23V ±1.5% bandgap reference voltage, capable of sourcing up to 100µA. It is used internally for output regulation and can drive external circuitry such as precision ADC references or comparator thresholds. A 1000pF capacitor must be placed from REF to GND to ensure stability and low-noise operation.
MAX763ACSA-TG068 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-TG068 FAQ
1.How can I place an order for MAX763ACSA-TG068 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX763ACSA-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 MAX763ACSA-TG068 reliable?
The price and inventory of MAX763ACSA-TG068 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX763ACSA-TG068 is usually 5 days.
3.What payment methods are accepted for MAX763ACSA-TG068?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX763ACSA-TG068 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX763ACSA-TG068?
MAX763ACSA-TG068 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX763ACSA-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 MAX763ACSA-TG068?
For technical support, including MAX763ACSA-TG068 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX763ACSA-TG068 requirements.
6.How does Aetrix verify that MAX763ACSA-TG068 is sourced from the original manufacturer or authorized distributors?
All MAX763ACSA-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 MAX763ACSA-TG068 meets industry standards.
7.What is the process for return or replacement of MAX763ACSA-TG068?
All MAX763ACSA-TG068 units undergo pre-shipment inspection (PSI). If there is an issue with MAX763ACSA-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 MAX763ACSA-TG068 part is unused and in its original packaging.
Return procedure for MAX763ACSA-TG068:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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