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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

STMicroelectronics ST730ACDTR

Name: ST730ACDTR
Brand: STMicroelectronics
SKU: ST730ACDTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST730ACDTR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: ST730ACDTR.pdf

Description:: IC REG BUCK 5V 450MA 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:2,600

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Product details

Overview

ST730ACDTR from STMicroelectronics is a 5V fixed-output, current-mode PWM step-down DC-DC converter IC designed for portable power supply rails. It accepts 5.2–11V input, delivers up to 450mA load current with 85–96% efficiency, features 200kHz fixed-frequency switching, 0.8mA quiescent current, and integrated P-channel MOSFET switch. Used in cellular phones and portable instrumentation where compact, pre-tuned regulation is required.

For engineers reviewing the ST730ACDTR datasheet, ST730ACDTR pinout, ST730ACDTR application, or ST730ACDTR equivalent, key selection criteria include its fixed 5V output, SO-8 package, shutdown control (SHDN), soft-start (SS) and compensation (CC) pin functions, and compatibility with 33µH or 100µH off-the-shelf inductors without custom magnetics design.

Technical Context

The ST730ACDTR implements current-mode PWM control with internal P-channel power switch, enabling precise cycle-by-cycle current limiting and stable regulation across line, load, and temperature. Its 1.25V reference (±5% accuracy), 180–280kHz oscillator (B/C series dependent), and external compensation via CC pin support robust voltage-loop stability.

It integrates under-voltage lockout (2.7–3V threshold), soft-start (capacitor-programmable), and overcurrent protection - all implemented without external sensing components. The LX pin directly drives the external inductor, while OUT senses feedback at the regulated 5V rail.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 5V ±5% - guaranteed regulation across input (5.2–11V), load (0–450mA), and temperature (–40°C to +85°C).
Switching Frequency	180–280kHz (B/C series) - enables use of small, low-ESR ceramic capacitors and standard 33µH/100µH inductors.
Efficiency Range	85–96% at 300mA - minimizes thermal rise in space-constrained portable designs without heatsinking.
Quiescent Current	0.8mA (ON), 0.3µA (SHDN) - extends battery life in standby and active modes of handheld devices.
LX On-Resistance	0.5Ω typical - limits conduction loss and supports 450mA continuous output with minimal dropout.
UVLO Threshold	2.7–3.0V falling - prevents erratic startup or brownout operation during weak battery conditions.
Reference Voltage	1.24V typ., 1.17–1.31V range - sets feedback divider ratio for accurate 5V output with ±5% tolerance.

Pinout & Package

ST730ACDTR is supplied in an SO-8 surface-mount package (5.00 × 4.00 mm body, 1.27 mm pitch), optimized for automated assembly and thermal performance on standard PCBs with copper pour.

Pin/Terminal	Circuit Role	Design Meaning
1 SHDN	Active-low enable input	Pull to GND disables regulator (0.3µA I_Q); tie to V_CC for normal operation.
2 REF	1.25V reference output	Bypassed with ≤47nF capacitor to stabilize reference; used for feedback scaling.
3 SS	Soft-start timing node	Capacitor to GND controls startup slew rate and provides short-circuit foldback protection.
4 CC	Voltage-loop compensation input	Connected to OUT via 330pF capacitor to set dominant pole for loop stability.
5 OUT	Feedback sense input	Connected directly to regulated 5V output; closes voltage regulation loop.
6 GND	Power and signal ground	Common return for V_CC, REF, SS, CC, OUT, and LX return path; requires low-impedance layout.
7 LX	Switch node	Drives external inductor; connects to source of internal P-MOSFET; high dv/dt node requiring tight routing.
8 V_CC	Input supply pin	Bypassed with 1µF ceramic + bulk electrolytic; must be placed adjacent to GND pin for noise immunity.

Key Features

Feature	Design Value
Integrated P-channel MOSFET switch	Eliminates need for external high-side switch and gate driver; reduces BOM count and layout complexity.
Pre-tuned inductor compatibility	Works with standard 33µH or 100µH shielded inductors - no custom magnetics or EMI filter tuning required.
Cycle-by-cycle current limiting	Provides inherent short-circuit protection without external sense resistor or comparator.
Adjustable soft-start	Capacitor-programmed ramp prevents inrush current and output overshoot during power-up.
Under-voltage lockout (UVLO)	Ensures clean startup only above 2.7V; avoids unstable operation during battery sag or cold cranking.

Applications

Cellular Handsets

Portable Test Instruments

Use Scenario: Powering baseband processor and RF front-end in GSM/EDGE handsets operating from single Li-ion cell (3.4–4.2V) with boost stage.

IC Role / Device Role / Timing Role: Primary 5V system rail regulator delivering stable 450mA to mixed-signal subsystems.

Use Value: Fixed 5V output with ±5% accuracy ensures ADC reference stability and digital logic compatibility without post-regulation LDO.

Use Scenario: Supplying microcontroller, display backlight, and analog sensor interface in handheld multimeters and oscilloscopes.

IC Role / Device Role / Timing Role: Compact, self-contained buck converter replacing discrete switcher designs with fewer passives.

Use Value: 0.8mA quiescent current extends battery runtime between calibrations; SO-8 footprint simplifies PCB layout in tight enclosures.

Wireless Headsets

USB Peripheral Hubs

Use Scenario: Generating clean 5V rail from boosted battery voltage for Bluetooth audio codec and Class-D amplifier.

IC Role / Device Role / Timing Role: Efficient intermediate-stage regulator minimizing heat in thermally isolated earpiece housing.

Use Value: 92% typical efficiency at 300mA reduces thermal load; 200kHz switching allows small 33µH inductor and 10µF ceramic output cap.

Use Scenario: Providing regulated 5V to downstream USB 2.0 ports and hub controller from unregulated 7–10V wall adapter input.

IC Role / Device Role / Timing Role: Standalone buck converter with UVLO and OCP, eliminating need for external supervisor IC.

Use Value: Integrated shutdown (SHDN) enables host-controlled power gating of unused ports, reducing system idle power.

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS62056DGQ	3MHz switching frequency, 600mA output, 2.5–6V input, 5V fixed output, 22µA quiescent current.	Higher frequency enables smaller inductors/caps but increases EMI sensitivity; lower I_Q benefits ultra-low-power sleep states.	Preferred for new designs needing higher efficiency at light loads or tighter size constraints; not pin-compatible.
LM2675-5.0	Fixed 5V output, 1A capability, 260kHz frequency, 5.5–40V input, 50mA quiescent current, DIP/SO-8 package.	Wider input range suits industrial 12V/24V systems; higher current rating allows headroom for future expansion.	Choose when input exceeds 11V or >450mA load margin is required; requires different inductor value (100µH typical).

Compared with TPS62056DGQ and LM2675-5.0, the ST730ACDTR offers optimal balance of cost, proven reliability in portable consumer designs, and minimal external component count - especially where 450mA at 5V from 5.2–11V is sufficient and board space permits SO-8 placement.

Availability

ST730ACDTR is available at Aetrix Electronics and suitable for cellular handsets, portable test instruments, wireless headsets, and USB peripheral hubs requiring stable component supply with long-term lifecycle visibility.

Supply support for ST730ACDTR 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, specializing in power management, microcontrollers, sensors, and automotive ICs.

The ST730A series belongs to ST's legacy analog power conversion portfolio, engineered specifically for cost-sensitive, battery-powered portable electronics demanding simple, reliable, fixed-output DC-DC regulation.

FAQ

What is the recommended inductor value for ST730ACDTR?

The ST730ACDTR is validated for use with either 33µH or 100µH shielded inductors - no custom design needed. ST recommends 33µH for higher efficiency at medium loads and 100µH for improved light-load regulation and lower peak currents. Both values are widely available from TDK, Murata, and Coilcraft in SO-8-compatible footprints.

Does ST730ACDTR require an external feedback resistor divider?

No. The ST730ACDTR provides a fixed 5V output and does not use an adjustable feedback network. The internal reference (1.25V) and error amplifier are configured for 5V regulation; OUT pin connects directly to the output rail, and REF is bypassed - no external resistors are needed for voltage setting.

Can ST730ACDTR operate below 5.2V input?

No. Absolute minimum input is 5.2V per datasheet specifications. Below this, UVLO activates and the device remains latched off. Attempting operation at 5.0V or lower results in no switching and zero output. For sub-5V inputs, consider a buck-boost or SEPIC topology - ST730ACDTR is strictly a step-down regulator.

Is ST730ACDTR still in active production?

ST730ACDTR is marked "Obsolete Product(s)" in the official ST datasheet revision (January 2003). However, Aetrix Electronics maintains verified, traceable inventory sourced from authorized channels with full lot traceability and extended lifecycle support for legacy design continuity and repair programs.

ST730ACDTR 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):: 4V

Voltage - Input (Max):: 11V

Voltage - Output (Min/Fixed):: 5V

Voltage - Output (Max):: -

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

ST730ACDTR FAQ

1.How can I place an order for ST730ACDTR through Aetrix?

Please submit a Request for Quotation (RFQ) for ST730ACDTR 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 ST730ACDTR reliable?

The price and inventory of ST730ACDTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST730ACDTR is usually 5 days.

3.What payment methods are accepted for ST730ACDTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST730ACDTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST730ACDTR?

ST730ACDTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST730ACDTR 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 ST730ACDTR?

For technical support, including ST730ACDTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST730ACDTR requirements.

6.How does Aetrix verify that ST730ACDTR is sourced from the original manufacturer or authorized distributors?

All ST730ACDTR 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 ST730ACDTR meets industry standards.

7.What is the process for return or replacement of ST730ACDTR?

All ST730ACDTR units undergo pre-shipment inspection (PSI). If there is an issue with ST730ACDTR, 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 ST730ACDTR part is unused and in its original packaging.

Return procedure for ST730ACDTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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