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

STMicroelectronics ST750ACD

Name: ST750ACD
Brand: STMicroelectronics
SKU: ST750ACD
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST750ACD

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

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

Datasheet:: ST750ACD.pdf

Description:: IC REG BUCK ADJ 450MA 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:1,828

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Product details

Overview

ST750ACD from STMicroelectronics is an adjustable-output, current-mode PWM step-down DC-DC converter in SO-8 package, operating from 4V to 11V input and delivering up to 450mA load current with 200kHz fixed switching frequency, 92% typical efficiency at 300mA, and ±4.5% output voltage accuracy over line/load/temperature. It integrates a P-channel power MOSFET and supports soft-start, cycle-by-cycle current limiting, and undervoltage lockout for portable power rails.

For engineers reviewing the ST750ACD datasheet, ST750ACD pinout, ST750ACD application, or ST750ACD equivalent, key selection criteria include its 0.8mA quiescent current, 0.3µA shutdown supply current, 1.25V internal reference voltage, SO-8 thermal resistance (160°C/W), and compatibility with pre-selected 33µH or 100µH inductors without custom magnetics design.

Technical Context

The ST750ACD employs current-mode PWM control with fixed 200kHz oscillator frequency (160–280kHz range), enabling precise duty-cycle adjustment per switching cycle for fast transient response and stable regulation. Its internal 1.25V reference feeds the feedback network, and output voltage is set externally via resistor divider.

Protection features include cycle-by-cycle current limiting, soft-start (via external capacitor on SS pin), undervoltage lockout (2.7–3V threshold), and thermal shutdown. The LX pin drives the integrated P-channel MOSFET (R_DS(on) = 0.5Ω), while CC pin enables outer-loop compensation with a 330pF capacitor to OUT.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4V to 11V - supports single-cell Li-ion or multi-cell alkaline/battery-backed systems
Output Current	Up to 450mA - sufficient for microcontroller cores, RF modules, or sensor subsystems
Switching Frequency	200kHz (typ.) - enables use of small, low-cost external inductors and capacitors
Efficiency	92% (typ. at 300mA) - minimizes thermal rise in space-constrained portable designs
Quiescent Current	0.8mA (ON), 0.3µA (SHDN) - extends battery life in standby and active modes
Reference Voltage	1.25V (±4.5% tolerance + resistor tolerance) - sets output accuracy for adjustable V_OUT
UVLO Threshold	2.7V to 3.0V - prevents erratic operation during brown-out or battery depletion

Pinout & Package

ST750ACD is housed in an SO-8 package (ECOPACK®, lead-free, 160°C/W junction-to-ambient thermal resistance) with standard 1.27mm pitch and 5.0mm × 4.0mm body dimensions.

Pin/Terminal	Circuit Role	Design Meaning
1 SHDN	Active-low enable input	Pull to GND for shutdown (0.3µA I_CC); tie to V_CC for normal operation
2 REF	Internal 1.25V reference output	Bypass to GND with ≤47nF capacitor to stabilize reference node
3 SS	Soft-start timing node	Connect external capacitor to GND to control startup slew rate and limit inrush current
4 CC	Voltage-loop compensation input	Connect 330pF capacitor between CC and OUT to stabilize feedback loop
5 IC	Internal connection	No external connection - leave unconnected
6 GND	Power and signal ground	Primary return path for V_CC, REF, SS, CC, and LX current
7 LX	Switch node	Drain of internal P-MOSFET; connects to inductor and catch diode/anode
8 V_CC	Input supply pin	Bypass with 1µF ceramic + bulk electrolytic capacitor close to pin

Key Features

Feature	Design Value
Integrated P-channel MOSFET	R_DS(on) = 0.5Ω enables compact, high-efficiency buck topology without external switch
Fixed-frequency current-mode control	200kHz operation ensures predictable EMI profile and simplifies filter design
Pre-selected inductor support	Validated with 33µH or 100µH values - eliminates custom magnetics qualification effort
Low-quiescent-current shutdown	0.3µA I_CC in SHDN mode extends shelf life and battery runtime in always-on systems
Comprehensive protection suite	Includes UVLO, soft-start, cycle-by-cycle current limiting, and thermal foldback

Applications

Cellular Handsets

Portable Test Instruments

Use Scenario: Powering baseband processor core voltage (e.g., 2.8V or 3.3V) from single Li-ion cell (3.0–4.2V).

IC Role / Device Role / Timing Role: Primary step-down regulator supplying regulated rail to MCU/DSP core with fast load-transient response.

Use Value: 92% efficiency at 300mA reduces heat generation in sealed handset enclosures; 0.8mA quiescent current preserves standby battery life.

Use Scenario: Generating stable 5V analog supply for precision ADCs and op-amps in handheld DMMs or oscilloscopes.

IC Role / Device Role / Timing Role: Low-noise, adjustable buck converter providing clean, ripple-controlled analog domain power.

Use Value: Fixed 200kHz switching avoids subharmonic ripple; ±4.5% output accuracy ensures measurement repeatability across temperature.

Wireless Modems

USB Peripheral Hubs

Use Scenario: Supplying 3.3V logic rail to Wi-Fi/BT transceiver ICs in battery-powered modems.

IC Role / Device Role / Timing Role: High-efficiency DC-DC converter enabling extended talk time under bursty RF transmit loads.

Use Value: Cycle-by-cycle current limiting protects against antenna mismatch or PA fault conditions; soft-start prevents inrush-induced system reset.

Use Scenario: Providing 5V bus power to downstream USB 2.0 devices from 9V wall adapter or 12V PoE-derived input.

IC Role / Device Role / Timing Role: Adjustable buck regulator configured as 5V fixed output for USB VBUS compliance.

Use Value: SO-8 package allows compact layout near USB connectors; 450mA output supports up to four low-power USB peripherals.

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Texas Instruments TPS54202	4.5–17V input, 2A output, 500kHz switching, integrated FETs, requires external compensation	Higher current and input voltage range; suited for industrial 12V-rail conversion	Select when >450mA output or >11V input is required; adds complexity with full compensation network
Analog Devices ADP2302	3–20V input, 2A output, 600kHz switching, 1.22V reference, no soft-start pin	Lacks dedicated SS pin; uses internal soft-start; higher frequency demands smaller LC but increases EMI filtering burden	Choose for higher efficiency at light loads or where board space favors smaller inductors, accepting loss of independent soft-start control

Compared with TPS54202 and ADP2302, the ST750ACD offers lower quiescent current (0.8mA vs ≥1.5mA), simpler external component count (no compensation resistor needed), and dedicated soft-start control - making it optimal for cost-sensitive, battery-operated 4–11V systems needing ≤450mA.

Availability

ST750ACD is available at Aetrix Electronics and suitable for cellular handsets, portable test instruments, wireless modems, and USB peripheral hubs requiring stable component supply and long-term design-in support.

Supply support for ST750ACD 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, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The ST750A series targets low-to-mid power portable electronics, delivering integrated, easy-to-use buck regulators with minimal external components and robust protection for battery-powered applications.

FAQ

What is the recommended inductor value for ST750ACD?

The ST750ACD is validated with two pre-selected inductor values: 33µH and 100µH. These values eliminate the need for custom inductor design or characterization. Use 33µH for higher output current and tighter regulation; 100µH for lower peak inductor current and reduced ripple in low-noise applications. Both support full 450mA output capability.

How does the soft-start function work on ST750ACD?

Soft-start is controlled by an external capacitor connected between the SS pin and GND. Charging this capacitor linearly ramps the internal reference voltage, which in turn gradually increases the output voltage during startup. This limits inrush current into output capacitance and prevents system reset due to input droop. Typical values range from 1nF to 100nF depending on desired ramp time.

Can ST750ACD operate with input voltage below 4V?

No. The absolute minimum input voltage is 4V per the datasheet's electrical characteristics table. Operation below 4V triggers undervoltage lockout (UVLO), disabling switching until V_CC rises above 2.7–3.0V. Below 4V, the device cannot sustain regulation or deliver rated output current, and may enter undefined behavior or oscillation.

Is ST750ACD RoHS-compliant and lead-free?

Yes. ST750ACD is supplied in an ECOPACK®-compliant SO-8 package with lead-free second-level interconnect, meeting RoHS Directive 2011/65/EU requirements. The package marking and inner box label indicate the lead-free status per JEDEC Standard JESD97, and soldering profiles follow industry-standard Pb-free reflow guidelines.

ST750ACD Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tube

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

ST750ACD FAQ

1.How can I place an order for ST750ACD through Aetrix?

Please submit a Request for Quotation (RFQ) for ST750ACD 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 ST750ACD reliable?

The price and inventory of ST750ACD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST750ACD is usually 5 days.

3.What payment methods are accepted for ST750ACD?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST750ACD transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST750ACD?

ST750ACD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST750ACD 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 ST750ACD?

For technical support, including ST750ACD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST750ACD requirements.

6.How does Aetrix verify that ST750ACD is sourced from the original manufacturer or authorized distributors?

All ST750ACD 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 ST750ACD meets industry standards.

7.What is the process for return or replacement of ST750ACD?

All ST750ACD units undergo pre-shipment inspection (PSI). If there is an issue with ST750ACD, 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 ST750ACD part is unused and in its original packaging.

Return procedure for ST750ACD:

1.Submit a request within 90 days.

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

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