My Inquiry
My Account
STMicroelectronics ST750ACDTR
- Part No.:
- ST750ACDTR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ST750ACDTR.pdf
- Description:
- IC REG BUCK ADJ 450MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,142
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ST750ACDTR from STMicroelectronics is an adjustable-output, current-mode PWM step-down DC-DC converter in SO-8 package, delivering up to 450mA at 4–11V input and 4.75–5.25V output. It operates at 160–280kHz fixed frequency with 85–96% efficiency, 0.8mA quiescent current, and integrated protections including overcurrent, soft-start, and undervoltage lockout. Used in portable communications equipment requiring compact, efficient voltage regulation.
For engineers reviewing the ST750ACDTR datasheet, ST750ACDTR pinout, ST750ACDTR application, or ST750ACDTR equivalent, key selection criteria include its 200kHz current-mode control architecture, ±4.5% output voltage accuracy (plus feedback resistor tolerance), SO-8 thermal resistance (160°C/W), shutdown leakage <1µA, and compatibility with pre-selected 33µH or 100µH inductors without custom design.
Technical Context
The ST750ACDTR employs current-mode PWM control with cycle-by-cycle current limiting and internal P-channel MOSFET switching (RDS(on) = 0.5Ω). Its reference voltage is trimmed to 1.25V (±3%) with 50ppm/°C drift, enabling precise feedback via external resistor divider.
Soft-start is implemented via external capacitor on SS pin; compensation uses a 330pF capacitor between CC and OUT. The device features undervoltage lockout (2.7–3.0V) and requires no inductor design-only one of two standard values (33µH or 100µH) suffices across most loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 11V - supports single-cell Li-ion or multi-cell alkaline inputs without external pre-regulation |
| Output Current | Up to 450mA - sufficient for baseband processors or RF front-ends in portable radios |
| Switching Frequency | 160–280kHz (typ. 200kHz) - enables use of small, low-ESR ceramic output capacitors and easy EMI filtering |
| Efficiency | 85% to 96% at 300mA - minimizes thermal load in space-constrained handheld enclosures |
| Quiescent Current | 0.8mA (ON), 0.3µA (SHDN) - extends battery life during standby in always-on portable instruments |
| Output Accuracy | ±4.5% + feedback resistor tolerance - ensures stable core voltage for microcontrollers under line/load/temp variation |
| UVLO Threshold | 2.7V to 3.0V - prevents erratic startup during brown-out conditions in battery-powered systems |
Pinout & Package
ST750ACDTR is housed in a standard SO-8 (Small Outline, 8-pin) package with ECOPACK® lead-free finish, 160°C/W junction-to-ambient thermal resistance, and recommended PCB copper pour for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Active-low shutdown control | Pull to GND to disable regulator; draws only 0.3µA in shutdown mode |
| 2 REF | 1.25V reference output | Bypassed with ≤47nF capacitor to stabilize feedback loop and reduce noise sensitivity |
| 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 330pF capacitor to ensure stability with selected inductor/capacitor values |
| 5 IC | Internal connection | No external connection permitted - floating or tied to GND may cause malfunction |
| 6 GND | Power and signal ground | Must be low-impedance plane; star-point connection recommended for noise-sensitive applications |
| 7 LX | Switch node (P-MOSFET drain) | Drives external inductor; peak current capability of 2A supports transient load demands |
| 8 VCC | Main supply input | Bypassed with 1µF ceramic + bulk electrolytic capacitor; placed adjacent to pins 6 and 8 |
Key Features
| Feature | Design Value |
|---|---|
| Pre-selected inductor support | Works with off-the-shelf 33µH or 100µH inductors - eliminates custom magnetics design and qualification |
| Current-mode PWM control | Enables fast transient response (<10µs recovery) and inherent cycle-by-cycle current limiting for robust overload handling |
| Integrated protection suite | Includes soft-start, UVLO, and overcurrent limiting - reduces need for external supervision circuitry |
| Low-noise fixed-frequency operation | Absence of subharmonic ripple simplifies EMI filtering and improves compatibility with noise-sensitive analog sections |
| SO-8 thermal performance | 160°C/W RthJA with standard PCB layout - supports continuous 450mA output without heatsink in ambient ≤50°C |
Applications
| Cellular Phones & Radios | Portable Instruments |
|---|---|
Use Scenario: Powering RF transceivers and baseband ASICs in handheld two-way radios operating from single Li-ion cells. IC Role / Device Role / Timing Role: Primary step-down regulator generating stable 5V rail for RF power amplifier bias and digital logic. Use Value: 92% efficiency at 300mA reduces heat generation in sealed plastic enclosures; 200kHz switching allows compact 1206-size output capacitors. | Use Scenario: Supplying precision ADCs and microcontrollers in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: Adjustable output regulator delivering 5.0V ±1% to analog front-end and MCU core, rejecting battery voltage sag. Use Value: ±4.5% output accuracy plus feedback resistor tolerance ensures measurement integrity; 0.3µA shutdown current preserves battery charge during storage. |
| Portable Communications Equipment | Computer Peripherals |
Use Scenario: Providing regulated 5V to USB-host controllers and PHY layers in portable Wi-Fi adapters and Bluetooth dongles. IC Role / Device Role / Timing Role: Efficient intermediate regulator converting 7–11V adapter input to clean 5V USB-compliant bus voltage. Use Value: 85–96% efficiency across load range minimizes self-heating near sensitive RF components; SO-8 footprint eases layout in narrow PCBs. | Use Scenario: Powering FPGA configuration circuits and interface logic in external storage enclosures and docking stations. IC Role / Device Role / Timing Role: Adjustable buck converter supplying configurable 3.3V or 5V rails to programmable logic and USB hub ICs. Use Value: External resistor divider enables precise output setting; 0.8mA quiescent current meets USB suspend-mode power budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS62231DRVR | Higher 3MHz switching frequency, lower 17µA quiescent current, but max 300mA output and requires external compensation. | Better suited for ultra-thin devices needing minimal output capacitance; less tolerant of high-current transients. | Select when board space is critical and load current ≤300mA; verify loop stability with chosen inductor. |
| Analog Devices ADP2303ARDZ | Fixed 3.3V output (non-adjustable), 1.2MHz switching, 3A capability, integrated high-side MOSFET. | Designed for higher-power, fixed-voltage applications like FPGA I/O banks; lacks adjustable output and soft-start flexibility. | Choose only if fixed 3.3V output suffices and >450mA peak current is required; not drop-in compatible. |
Compared with TPS62231DRVR and ADP2303ARDZ, the ST750ACDTR offers unique balance of adjustable output, 450mA capability, and SO-8 thermal performance-making it optimal for mid-power portable designs where flexibility, cost, and proven reliability outweigh ultra-high-frequency or ultra-low-IQ requirements.
Availability
ST750ACDTR is available at Aetrix Electronics and suitable for cellular phones & radios, portable instruments, and portable communications equipment requiring stable component supply and long-term design continuity.
Supply support for ST750ACDTR 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 microcontrollers, power management ICs, sensors, and automotive-grade components.
The ST750A series was developed specifically for cost-sensitive, space-constrained portable electronics requiring simple, reliable, and efficient DC-DC conversion without custom magnetics design.
FAQ
What is the minimum input voltage required for stable operation of ST750ACDTR?
The ST750ACDTR requires a minimum input voltage of 4V to maintain regulation. Below this threshold, undervoltage lockout activates at 2.7–3.0V, disabling the output to prevent unstable switching. Operation below 4V is not guaranteed per datasheet specifications, and output voltage accuracy degrades significantly below this point even if the device remains enabled.
Can ST750ACDTR be used with a 10µH inductor instead of the specified 33µH or 100µH?
No-using a 10µH inductor violates the design constraints validated in the datasheet. The ST750ACDTR's current-mode control and compensation network are optimized for either 33µH or 100µH inductors. A 10µH value would cause excessive peak currents, potential saturation, instability, and failure to meet efficiency or thermal specs. Only the two pre-qualified values are supported.
How does the REF pin function, and what capacitor value is allowed?
The REF pin outputs a precision 1.25V reference used by the feedback divider. It must be bypassed to GND with a capacitor ≤47nF to suppress noise and ensure loop stability. Larger capacitors risk phase margin loss and oscillation; smaller values (e.g., 10nF) are acceptable but offer less noise filtering. Ceramic dielectric is mandatory for low ESR and high-frequency response.
Is ST750ACDTR still in active production, and what is its lifecycle status?
ST750ACDTR is marked as "Obsolete Product(s)" in the official ST datasheet revision history (Rev. 3, May 2007). While no longer in active production, Aetrix Electronics maintains legacy inventory and supports design continuity through traceable, tested stock and lifecycle coordination for existing programs requiring last-time buys or long-term maintenance.
ST750ACDTR 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 11V
- Voltage - Output (Min/Fixed):
- 4.75V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 450mA
- Frequency - Switching:
- 160kHz ~ 280kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ST750ACDTR FAQ
1.How can I place an order for ST750ACDTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST750ACDTR 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 ST750ACDTR reliable?
The price and inventory of ST750ACDTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST750ACDTR is usually 5 days.
3.What payment methods are accepted for ST750ACDTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST750ACDTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST750ACDTR?
ST750ACDTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST750ACDTR 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 ST750ACDTR?
For technical support, including ST750ACDTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST750ACDTR requirements.
6.How does Aetrix verify that ST750ACDTR is sourced from the original manufacturer or authorized distributors?
All ST750ACDTR 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 ST750ACDTR meets industry standards.
7.What is the process for return or replacement of ST750ACDTR?
All ST750ACDTR units undergo pre-shipment inspection (PSI). If there is an issue with ST750ACDTR, 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 ST750ACDTR part is unused and in its original packaging.
Return procedure for ST750ACDTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ST750ACDTR Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
