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STMicroelectronics ST763ABN
- Part No.:
- ST763ABN
- Manufacturer:
- STMicroelectronics
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ST763ABN.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,741
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Product details
Overview
ST763ABN from STMicroelectronics is a fixed-output 3.3V, current-mode PWM step-down DC-DC converter with 500mA guaranteed output current, 200kHz typical switching frequency, and ±5% output voltage accuracy over line/load/temperature. It operates from 3.3V to 11V input, delivers 90% typical efficiency, and supports ON/OFF control via active-low SHDN pin for portable instrumentation and 5V-to-3.3V conversion.
For engineers reviewing the ST763ABN datasheet, ST763ABN pinout, ST763ABN application, or ST763ABN equivalent, key selection criteria include shutdown quiescent current (0.2µA), internal P-channel MOSFET RDS(on) (1Ω), soft-start programmability, under-voltage lockout (2.7–3V), and SO-8/DIP-8 package compatibility with low-external-component designs.
Technical Context
The ST763ABN implements current-mode PWM control with cycle-by-cycle current limiting and internal compensation, enabling precise regulation and fast transient response. Its reference voltage (1.25V ±50ppm/°C) feeds an outer voltage feedback loop stabilized via external CC and SS capacitors.
It integrates a P-channel power MOSFET switch (LX pin), shutdown logic with hysteresis, and under-voltage lockout that disables operation below 2.7V VCC. The fixed 200kHz switching frequency simplifies EMI filtering and allows use of standard 22µH inductors without custom magnetics design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±5% - ensures stable core/logic rail for 3.3V microcontrollers and peripherals |
| Input Voltage Range | 3.3V to 11V - supports direct operation from Li-ion batteries (4.2V), 5V rails, or unregulated wall adapters |
| Max Output Current | 500mA - sufficient for powering ARM Cortex-M MCUs, sensors, and interface ICs in portable systems |
| Switching Frequency | 200kHz typical - enables use of compact 22µH inductors and reduces EMI compared to higher-frequency converters |
| Quiescent Current | 0.6mA (ON), 0.2µA (OFF) - extends battery life in always-on monitoring and sleep-mode applications |
| RDS(on) | 1Ω (LX MOSFET) - limits conduction loss at 500mA, contributing to 90% typical efficiency |
| UVLO Threshold | 2.7V (falling), 3V (rising) - prevents erratic startup/shutdown during brown-out conditions |
Pinout & Package
ST763ABN is available in SO-8 and DIP-8 packages. Both are 8-pin surface-mount and through-hole variants with identical pin functions and thermal performance characteristics per ST's mechanical data sheets.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Active-low enable control | Pull to GND for shutdown (0.2µA IQ); tie to VCC for normal operation |
| 2 REF | 1.25V reference output | Bypassed with 47nF to GND; used as precision feedback reference for outer loop |
| 3 SS | Soft-start timing node | Capacitor to GND sets startup ramp time and provides short-circuit protection |
| 4 CC | Compensation capacitor input | Connected to OUT via 330pF; stabilizes voltage feedback loop against load transients |
| 5 OUT | Feedback sense input | Direct connection to regulated 3.3V output; closes regulation loop |
| 6 GND | Power and signal ground | Common return for all internal circuits and external bypass capacitors |
| 7 LX | Switch node | Drain of internal P-MOSFET; drives external inductor and freewheeling diode |
| 8 VCC | Supply input | Bypassed with 1µF ceramic + bulk electrolytic; powers internal circuitry and gate driver |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables inherent cycle-by-cycle current limiting and superior load transient response without external sensing |
| Programmable soft-start | SS pin capacitor sets controlled output voltage ramp, preventing inrush current and overshoot at startup |
| Integrated P-channel MOSFET | Eliminates need for external high-side switch; reduces BOM count and layout complexity |
| Under-voltage lockout (UVLO) | Hysteresis between 2.7V and 3V prevents oscillation during marginal input conditions |
| ±5% output accuracy | Maintained across -40°C to +85°C, full load range, and input variation - suitable for precision logic supply |
Applications
| Cellular Phone Power Supply | Hand-Held Computer Core Rail |
|---|---|
Use Scenario: Regulating 5V or Li-ion battery voltage to clean 3.3V for baseband processor and RF front-end. IC Role / Device Role / Timing Role: Primary step-down regulator providing stable core voltage with low-noise switching and fast load response. Use Value: 90% efficiency minimizes heat in sealed enclosures; 0.2µA shutdown current preserves standby battery life. | Use Scenario: Converting unregulated 5V adapter output to 3.3V for ARM-based application processors and memory interfaces. IC Role / Device Role / Timing Role: Fixed-output buck converter delivering up to 500mA with ±5% regulation tolerance. Use Value: SO-8 package enables compact PCB layout; 200kHz switching allows simple LC filtering for low ripple (<20mVpp). |
| Portable Instrumentation Sensor Bias | USB Peripheral 3.3V Rail |
Use Scenario: Generating precise 3.3V bias for analog sensors and ADC references in battery-powered test equipment. IC Role / Device Role / Timing Role: Low-drift, temperature-stable voltage source using internal 1.25V reference and feedback network. Use Value: 50ppm/°C reference drift and ±5% output accuracy ensure measurement integrity across operating temperature range. | Use Scenario: Providing isolated 3.3V rail for USB-to-serial bridges, HID controllers, and flash storage in host-connected devices. IC Role / Device Role / Timing Role: Standby-optimized DC-DC converter with ON/OFF control synchronized to USB suspend/resume signaling. Use Value: Active-low SHDN pin enables direct interface with USB PHY suspend status; 0.2µA off-mode current meets USB battery charging spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62056DGQ | 3.3V fixed output, 600mA, 2.5V–6V input, 2.25MHz switching, 1.5µA shutdown current | Higher frequency enables smaller inductors but increases EMI sensitivity; requires more careful layout | Preferred for space-constrained designs where 2.25MHz allows sub-2mm inductors; not drop-in due to different pinout and control scheme |
| LM2675-3.3 | 3.3V fixed output, 1A, 8V–40V input, 260kHz, 5mA quiescent current, external MOSFET required | Wider input range suits industrial 24V systems; higher IQ limits battery use | Choose when input exceeds 11V or >500mA load is needed; requires external high-side switch and compensation components |
Compared with TPS62056DGQ and LM2675-3.3, the ST763ABN offers optimal balance of ultra-low shutdown current (0.2µA), integrated P-MOSFET, and 200kHz operation-making it ideal for cost-sensitive, battery-powered 5V-to-3.3V conversion where layout simplicity and standby efficiency are critical.
Availability
ST763ABN is available at Aetrix Electronics and suitable for cellular phone power supplies, hand-held computer core rails, portable instrumentation sensor bias, and USB peripheral 3.3V rails requiring stable component supply and long-term manufacturability.
Supply support for ST763ABN 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, Switzerland, 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-operated equipment, emphasizing integration, efficiency, and ease-of-use with minimal external components.
FAQ
What is the recommended inductor value for ST763ABN?
A 22µH inductor is specified in the datasheet for most applications. It provides optimal trade-off between size, ripple current, and efficiency at 200kHz switching frequency. Inductor saturation current must exceed 1.2A peak to accommodate cycle-by-cycle current limiting and transient loads.
Does ST763ABN require external compensation components?
Yes - external capacitors are required on SS (soft-start) and CC (compensation) pins. A 330pF capacitor connects CC to OUT for loop stability, and a capacitor from SS to GND sets startup time and enhances short-circuit protection. No resistor network is needed for basic operation.
Can ST763ABN operate with input voltage below 3.3V?
No - the absolute minimum input voltage is 3.3V per electrical specifications. Below this, UVLO disables operation, and the internal reference cannot sustain regulation. Attempting operation below 3.3V results in no output or unstable switching behavior.
Is ST763ABN RoHS compliant and halogen-free?
Yes - ST763ABN conforms to RoHS Directive 2011/65/EU and is halogen-free per STMicroelectronics' product compliance documentation. The SO-8 and DIP-8 packages use lead-free terminations and meet JEDEC J-STD-020 reflow profiles.
ST763ABN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 8-DIP
ST763ABN FAQ
1.How can I place an order for ST763ABN through Aetrix?
Please submit a Request for Quotation (RFQ) for ST763ABN 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 ST763ABN reliable?
The price and inventory of ST763ABN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST763ABN is usually 5 days.
3.What payment methods are accepted for ST763ABN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST763ABN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST763ABN?
ST763ABN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST763ABN 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 ST763ABN?
For technical support, including ST763ABN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST763ABN requirements.
6.How does Aetrix verify that ST763ABN is sourced from the original manufacturer or authorized distributors?
All ST763ABN 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 ST763ABN meets industry standards.
7.What is the process for return or replacement of ST763ABN?
All ST763ABN units undergo pre-shipment inspection (PSI). If there is an issue with ST763ABN, 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 ST763ABN part is unused and in its original packaging.
Return procedure for ST763ABN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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