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STMicroelectronics ST763ACDTR
- Part No.:
- ST763ACDTR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ST763ACDTR.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,044
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Product details
Overview
ST763ACDTR from STMicroelectronics is a fixed-output 3.3 V, 500 mA step-down DC-DC switching regulator with PWM current-mode control, 200 kHz typical switching frequency, 90% typical efficiency, and 0.6 mA quiescent current in ON mode. It integrates a P-channel power MOSFET and supports shutdown control, soft-start, and overcurrent/UVLO protection - used in 5V-to-3.3V conversion for portable instrumentation and hand-held computers.
For engineers reviewing the ST763ACDTR datasheet, ST763ACDTR pinout, ST763ACDTR application, or ST763ACDTR equivalent, key selection criteria include guaranteed ±5% output voltage accuracy across line/load/temperature, SO-8 package thermal resistance (160 °C/W), and verified 22 µH inductor compatibility without custom compensation design.
Technical Context
The ST763ACDTR employs current-mode PWM control to deliver precise regulation and fast transient response, with internal cycle-by-cycle current limiting and programmable soft-start via external capacitor on SS pin. Its feedback loop uses a 1.25 V reference (±50 ppm/°C drift) and voltage-sense input (OUT pin) for output regulation.
It features under-voltage lockout (2.7–3 V threshold), 1 Ω typical LX on-resistance, and 10 nA LX leakage at 12 V - enabling stable operation from 3.3 V to 11 V input while maintaining 0.2 µA shutdown current. The fixed 200 kHz switching frequency simplifies EMI filtering and output ripple suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±5% over line, load, and temperature - ensures reliable logic-level supply for 3.3 V microcontrollers and peripherals. |
| Max Output Current | 500 mA continuous - sufficient to power baseband processors or interface ICs in portable devices without external boost stages. |
| Input Voltage Range | 3.3 V to 11 V - supports direct operation from single Li-ion cells (fully charged) or regulated 5 V rails. |
| Switching Frequency | 200 kHz typical (159–212.5 kHz range) - enables use of low-cost, standard 22 µH inductors and reduces EMI filter complexity. |
| Quiescent Current | 0.6 mA in ON mode, 0.2 µA in shutdown - extends battery life in always-on or sleep-mode applications like handheld scanners. |
| Efficiency | 90% typical at 300 mA - minimizes thermal rise in SO-8 package and reduces need for heatsinking in space-constrained layouts. |
| Reference Voltage | 1.25 V ±0.07 V at 25°C, 50 ppm/°C drift - provides stable feedback reference for accurate output regulation across industrial temperature range. |
Pinout & Package
ST763ACDTR is supplied in an SO-8 surface-mount package (JEDEC MS-012, 1.27 mm pitch), with 160 °C/W junction-to-ambient thermal resistance and 0.4–1.27 mm lead length per mechanical drawing 0016023.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Active-low shutdown control | Pulling low disables switching and reduces supply current to 0.2 µA; tied to VCC for normal operation. |
| 2 REF | 1.25 V reference output | Bypassed with 47 nF capacitor to GND; serves as precision reference for feedback network calibration. |
| 3 SS | Soft-start timing node | External capacitor sets startup ramp time and provides short-circuit protection during turn-on. |
| 4 CC | Voltage-loop compensation input | Connected to OUT via 330 pF capacitor to stabilize feedback loop and prevent oscillation. |
| 5 OUT | Output voltage sense input | Direct connection to regulated 3.3 V rail enables accurate closed-loop feedback regulation. |
| 6 GND | Power and signal ground reference | Common return path for internal circuitry, LX switch, and external capacitors; requires low-impedance PCB layout. |
| 7 LX | Switch node (P-MOSFET drain) | Drives external inductor; peak current limited to 2 A; 1 Ω typical on-resistance minimizes conduction loss. |
| 8 VCC | Main supply input | Accepts 3.3–11 V; bypassed with 1 µF ceramic + bulk electrolytic capacitor placed adjacent to pins for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P-channel power switch | Eliminates need for external high-side MOSFET and gate driver, reducing BOM count and board area. |
| Current-mode PWM control | Enables inherent cycle-by-cycle current limiting and superior line/load transient response vs. voltage-mode controllers. |
| Programmable soft-start | Capacitor on SS pin controls output voltage ramp rate, preventing inrush current and protecting downstream loads. |
| Under-voltage lockout (UVLO) | Disables operation below 2.7 V input, avoiding unstable regulation and erratic behavior during brown-out conditions. |
| Fixed-frequency operation | 200 kHz switching allows predictable EMI spectrum and straightforward LC filter design using standard off-the-shelf components. |
Applications
| 5V-to-3.3V Point-of-Load Conversion | Portable Instrumentation Power Supply |
|---|---|
|
Use Scenario: Converting 5 V rail from USB or wall adapter to clean 3.3 V for analog front-end and MCU in handheld multimeters. IC Role / Device Role / Timing Role: Primary DC-DC regulator providing regulated 3.3 V output with ±5% accuracy and <1% load regulation. Use Value: Replaces linear regulators to achieve 90% efficiency and avoid thermal derating at 500 mA load in sealed enclosures. |
Use Scenario: Powering mixed-signal circuits in battery-operated gas detectors with strict standby current limits. IC Role / Device Role / Timing Role: Main system regulator with 0.2 µA shutdown current and programmable soft-start for controlled wake-up sequences. Use Value: Extends battery life by >3× versus LDO solutions while maintaining fast transient response to sensor activation events. |
| Hand-Held Computer Core Supply | Cellular Phone Baseband Subsystem |
|
Use Scenario: Delivering 3.3 V to ARM-based application processor and memory interface in ruggedized PDAs. IC Role / Device Role / Timing Role: High-efficiency buck converter operating from single-cell Li-ion (4.2 V max) with UVLO and overcurrent protection. Use Value: Enables full 500 mA load capability across -40°C to +85°C without derating, supporting extended outdoor operation. |
Use Scenario: Generating 3.3 V for RF transceiver and digital baseband ICs in early GSM handsets. IC Role / Device Role / Timing Role: Compact, SO-8 mounted regulator with integrated soft-start and reference output for external feedback scaling. Use Value: Reduces external component count to just inductor, two capacitors, and one compensation capacitor - accelerating layout validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675-3.3 | 500 mA, 260 kHz, requires external N-MOSFET and diode; no integrated P-MOSFET or REF output. | Lacks soft-start and reference output; needs more external components and larger PCB footprint. | Preferred when cost sensitivity outweighs board space constraints and design simplicity. |
| TPS62056DGQ | 600 mA, 2.25 MHz, synchronous rectification, 2.5 V–6.5 V input; smaller QFN-10 package. | Higher frequency enables smaller inductor (1 µH), but requires tighter layout for EMI and lacks UVLO hysteresis. | Chosen for ultra-compact designs where 2.25 MHz switching and higher current margin justify redesign effort. |
Compared with LM2675-3.3 and TPS62056DGQ, ST763ACDTR offers integrated P-MOSFET and reference output in SO-8, simplifying layout and reducing component count - ideal for cost-sensitive, thermally constrained 5V-input applications where 200 kHz switching is acceptable.
Availability
ST763ACDTR is available at Aetrix Electronics and suitable for 5V-to-3.3V point-of-load conversion, portable instrumentation power supplies, and hand-held computer core supplies requiring stable component supply and long-term industrial availability.
Supply support for ST763ACDTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
The ST763A series targets cost-effective, low-component-count DC-DC conversion in battery-powered and space-constrained applications - emphasizing integration, thermal robustness, and ease of implementation without external compensation.
FAQ
What is the minimum input voltage required for ST763ACDTR to regulate 3.3 V output?
The ST763ACDTR requires a minimum input voltage of 3.3 V to maintain regulation, as specified in its absolute maximum ratings and electrical characteristics table. Below this, under-voltage lockout activates and disables switching. Operation at exactly 3.3 V is supported but yields marginal headroom; 3.6 V or higher is recommended for stable 500 mA output across temperature.
Can ST763ACDTR operate without the soft-start capacitor?
No - the SS pin must be connected to GND through an external capacitor (typical 10–100 nF) to enable proper startup sequencing and short-circuit protection. Omitting it causes uncontrolled inrush current, potential output overshoot, and may trigger overcurrent shutdown before regulation stabilizes.
Is the REF pin intended for external feedback scaling?
Yes - the 1.25 V REF pin provides a precision internal reference that can be used with external resistor dividers to adjust output voltage in custom designs. However, ST763ACDTR is factory-trimmed for fixed 3.3 V output; modifying feedback requires recalculating the OUT-to-GND divider and verifying stability with CC compensation.
What is the maximum allowable LX node voltage swing during switching?
The LX pin voltage swings between near-GND (during P-MOSFET conduction) and up to VCC + 0.3 V (during flyback phase). Absolute maximum rating is VCC + 0.3 V; exceeding this risks latch-up or permanent damage. Layout must minimize parasitic inductance to suppress ringing above this limit.
ST763ACDTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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 (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ST763ACDTR FAQ
1.How can I place an order for ST763ACDTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST763ACDTR 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 ST763ACDTR reliable?
The price and inventory of ST763ACDTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST763ACDTR is usually 5 days.
3.What payment methods are accepted for ST763ACDTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST763ACDTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST763ACDTR?
ST763ACDTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST763ACDTR 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 ST763ACDTR?
For technical support, including ST763ACDTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST763ACDTR requirements.
6.How does Aetrix verify that ST763ACDTR is sourced from the original manufacturer or authorized distributors?
All ST763ACDTR 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 ST763ACDTR meets industry standards.
7.What is the process for return or replacement of ST763ACDTR?
All ST763ACDTR units undergo pre-shipment inspection (PSI). If there is an issue with ST763ACDTR, 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 ST763ACDTR part is unused and in its original packaging.
Return procedure for ST763ACDTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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