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STMicroelectronics ST763ABDTR
- Part No.:
- ST763ABDTR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ST763ABDTR.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,281
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Product details
Overview
ST763ABDTR from STMicroelectronics is a fixed-output 3.3 V, 500 mA step-down DC-DC switching regulator with PWM current-mode control, operating from 3.3 V to 11 V input, 200 kHz typical switching frequency, and 90% typical efficiency. It integrates a P-channel power MOSFET, supports shutdown control (active-low SHDN), and delivers ±5% output voltage accuracy across line, load, and temperature.
For engineers reviewing the ST763ABDTR datasheet, ST763ABDTR pinout, ST763ABDTR application, or ST763ABDTR equivalent, key selection criteria include guaranteed 500 mA output, 0.2 µA shutdown quiescent current, SO-8 package thermal resistance (160 °C/W), under-voltage lockout (2.7–3.0 V), and soft-start programmability via external capacitor.
Technical Context
The ST763ABDTR implements current-mode PWM control with cycle-by-cycle current limiting and internal compensation for stable regulation under dynamic load transients. Its reference voltage (1.25 V) feeds an outer voltage feedback loop, while the SS pin enables adjustable soft-start duration and short-circuit protection.
It features under-voltage lockout (UVLO) activation at ~2.7 V falling VCC, 1 Ω typical LX on-resistance, and 50 ppm/°C reference drift - enabling precise 3.3 V output regulation across -40°C to +85°C junction temperature range without external trimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±5% over line/load/temp - ensures stable logic supply for 3.3 V microcontrollers and peripherals. |
| Max Output Current | 500 mA continuous - sufficient for powering baseband processors, RF modules, or sensor interfaces in portable systems. |
| Input Voltage Range | 3.3 V to 11 V - supports direct operation from single Li-ion (4.2 V), dual AA (3 V), or regulated 5 V/9 V rails. |
| Switching Frequency | 200 kHz typical - enables use of compact 22 µH inductors and simplifies EMI filtering with standard ceramic capacitors. |
| Quiescent Current | 0.6 mA in ON mode, 0.2 µA in shutdown - extends battery life in always-on or sleep-mode applications. |
| Efficiency | 90% typical at 300 mA - minimizes thermal rise in SO-8 package and reduces need for heatsinking in space-constrained designs. |
| UVLO Threshold | 2.7 V (falling), 3.0 V (rising) - prevents erratic startup or brownout operation during weak battery conditions. |
Pinout & Package
ST763ABDTR is supplied in an SO-8 surface-mount package (JEDEC MS-012AC, 5.0 mm × 6.2 mm, 1.27 mm pitch), with 160 °C/W junction-to-ambient thermal resistance under standard PCB layout conditions.
| 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 to GND to stabilize feedback reference; used as precision voltage source for external circuitry. |
| 3 (SS) | Soft-start timing node | External capacitor sets startup ramp time and provides short-circuit fault recovery; also enables hiccup-mode protection. |
| 4 (CC) | Voltage-loop compensation input | Connected to OUT via 330 pF capacitor to set dominant pole and ensure loop stability across load conditions. |
| 5 (OUT) | Feedback sense input | Directly connected to regulated 3.3 V output; forms resistive divider with internal 1.25 V reference for closed-loop regulation. |
| 6 (GND) | Power and signal ground | Common return path for IC bias, switching current, and feedback network; requires low-inductance layout near VCC and LX pins. |
| 7 (LX) | Switch node (P-MOSFET drain) | Drives external inductor; peak current limited to 2 A internally; requires low-ESR ceramic output capacitor and Schottky catch diode (e.g., STPS330U). |
| 8 (VCC) | Supply input | Accepts 3.3–11 V; bypassed with 1 µF ceramic + bulk electrolytic capacitor placed adjacent to pin for high-frequency decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P-channel MOSFET switch | Eliminates need for external high-side switch; reduces BOM count and layout complexity in buck topologies. |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting and fast transient response to load steps up to 500 mA. |
| Programmable soft-start | Capacitor on SS pin controls output voltage ramp rate, preventing inrush current and enabling controlled power sequencing. |
| Under-voltage lockout (UVLO) | Prevents operation below 2.7 V, avoiding unstable regulation or uncontrolled switching during battery discharge. |
| ±5% output voltage accuracy | Maintains tight tolerance across full temperature (-40°C to +85°C), load (0–500 mA), and input (3.3–11 V) ranges without calibration. |
Applications
| Cellular Phone Power Supply | Hand-Held Computer Core Rail |
|---|---|
Use Scenario: Regulating 5 V or Li-ion battery voltage to clean 3.3 V for baseband processor and memory subsystems. IC Role / Device Role / Timing Role: Primary step-down DC-DC converter providing main logic supply with low-noise, high-efficiency regulation. Use Value: 90% efficiency and 0.2 µA shutdown current extend talk time and standby duration in battery-powered handsets. | Use Scenario: Generating stable 3.3 V rail from variable-input sources (e.g., 7.2 V NiMH pack or USB 5 V) in PDAs and tablets. IC Role / Device Role / Timing Role: Fixed-output buck regulator delivering core voltage to ARM-based application processors and NAND flash controllers. Use Value: Soft-start and UVLO prevent system reset during hot-plug events or battery insertion; ±5% accuracy ensures reliable CPU clocking and I/O signaling. |
| Portable Instrument Sensor Interface | Peripheral USB-to-Serial Adapter |
Use Scenario: Powering low-noise analog front-ends (ADCs, op-amps) and digital sensors in handheld test equipment. IC Role / Device Role / Timing Role: Isolated 3.3 V supply with low ripple and high PSRR, decoupled from noisy digital domains via external LC filter. Use Value: 200 kHz fixed frequency allows predictable noise placement; 0.6 mA quiescent current preserves battery life during measurement intervals. | Use Scenario: Converting 5 V USB bus power to 3.3 V for FTDI or CP210x UART bridge ICs and level-shifting logic. IC Role / Device Role / Timing Role: Compact, self-contained buck converter replacing linear regulators to avoid thermal derating at full USB current (500 mA). Use Value: SO-8 footprint and minimal external parts (22 µH inductor, 220 µF output cap, STPS330U diode) enable ultra-thin adapter PCB designs. |
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 |
|---|---|---|---|
| TPS62056DGQ | 3.3 V fixed output, 600 mA, 2.5 V–6 V input, 2.25 MHz switching, integrated synchronous rectifier | Higher frequency enables smaller inductors/caps but increases EMI sensitivity; no external diode required | Preferred for space-constrained designs needing >500 mA and lower EMI filtering overhead |
| LM2675-3.3 | 3.3 V fixed output, 1 A, 8 V–40 V input, 260 kHz, external N-MOSFET and diode required | Wider input range suits industrial 12/24 V systems; higher current capability but larger solution size | Chosen when input exceeds 11 V or >500 mA load is anticipated |
Compared with TPS62056DGQ and LM2675-3.3, the ST763ABDTR offers optimal balance of low quiescent current (0.2 µA), integrated P-MOSFET, and SO-8 compatibility for cost-sensitive, battery-operated 3.3 V systems with 3.3–11 V input constraints.
Availability
ST763ABDTR is available at Aetrix Electronics and suitable for cellular phone power supplies, hand-held computer core rails, and portable instrument sensor interfaces requiring stable component supply and long-term production continuity.
Supply support for ST763ABDTR 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, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.
The ST763A series targets low-power, fixed-output DC-DC conversion in portable and battery-powered equipment, emphasizing simplicity, reliability, and minimal external component count.
FAQ
What is the minimum input voltage required for stable 3.3 V output regulation?
The ST763ABDTR requires a minimum input voltage of 3.3 V to maintain regulation. Below this, under-voltage lockout activates at 2.7 V (falling), disabling switching. Operation at exactly 3.3 V is supported per datasheet specifications, with output accuracy maintained within ±5% across load and temperature.
Can the ST763ABDTR be used without an external Schottky diode?
No - the ST763ABDTR uses an internal P-channel MOSFET but requires an external catch diode (e.g., STPS330U) between LX and GND to complete the buck converter path. Unlike synchronous buck regulators, it lacks an integrated low-side switch, so omission of the diode will cause failure to regulate and potential device damage.
How does the soft-start function protect the circuit during power-up?
The SS pin accepts an external capacitor that controls the ramp rate of the internal reference voltage, delaying full output voltage rise. This limits inrush current into output capacitors and downstream loads, prevents overshoot, and enables coordinated power sequencing in multi-rail systems - especially critical when driving large capacitance or sensitive logic.
Is the ST763ABDTR RoHS-compliant and halogen-free?
Yes - STMicroelectronics confirms the ST763ABDTR (SO-8 package) meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The device carries the "E" suffix in ordering codes indicating compliance, and its material declaration is publicly available on ST's official product page.
ST763ABDTR 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:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ST763ABDTR FAQ
1.How can I place an order for ST763ABDTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST763ABDTR 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 ST763ABDTR reliable?
The price and inventory of ST763ABDTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST763ABDTR is usually 5 days.
3.What payment methods are accepted for ST763ABDTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST763ABDTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST763ABDTR?
ST763ABDTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST763ABDTR 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 ST763ABDTR?
For technical support, including ST763ABDTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST763ABDTR requirements.
6.How does Aetrix verify that ST763ABDTR is sourced from the original manufacturer or authorized distributors?
All ST763ABDTR 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 ST763ABDTR meets industry standards.
7.What is the process for return or replacement of ST763ABDTR?
All ST763ABDTR units undergo pre-shipment inspection (PSI). If there is an issue with ST763ABDTR, 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 ST763ABDTR part is unused and in its original packaging.
Return procedure for ST763ABDTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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