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

STMicroelectronics ST755CN

Name: ST755CN
Brand: STMicroelectronics
SKU: ST755CN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST755CN

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-DIP (0.300", 7.62mm)

Datasheet:: ST755CN.pdf

Description:: IC REG BUCK BOOST ADJ 200MA 8DIP

Quantity:: RFQ Add To RFQ list

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Inventory:1,183

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Product details

Overview

ST755CN from STMicroelectronics is an adjustable inverting negative-output current-mode PWM DC-DC regulator with integrated P-channel Power MOSFET, delivering up to 275mA output current at –5V (25°C), 160kHz fixed-frequency operation, 1.25V internal reference, and shutdown control. It converts 2.7V–11V positive input to adjustable negative output (e.g., –5V) for low-noise analog supply rails in portable instrumentation.

For engineers reviewing the ST755CN datasheet, ST755CN pinout, ST755CN application, or ST755CN equivalent, key selection criteria include guaranteed 200mA output at –5V over 0°C–70°C, 1.2mA no-load quiescent current, SO-8 package thermal resistance (160°C/W), and compatibility with standard 10µH inductors and low-ESR ceramic capacitors.

Technical Context

The ST755CN implements current-mode PWM control with a fixed 160kHz oscillator and internal error amplifier that regulates output by maintaining 0V on the CC (compensation) pin. Its BCD process enables high temperature stability (–40°C to 185°C junction), precise 1.25V reference (±50ppm/°C drift), and low-jitter switching.

It uses a 0.7Ω R_DS(on) P-channel MOSFET switch driven by an internal gate driver, with soft-start controlled via external capacitor on SS pin and logic-level shutdown (V_IL = 0.25V, V_IH = 2V) reducing supply current to 10µA.

Key Specifications

Parameter	Value and Actual Design Meaning
Input voltage range	2.7V to 11V - supports single-cell Li-ion, 3.3V/5V rails, and wide industrial input sources
Output voltage range	Adjustable negative output, \|V_O\| ≤ 12.7V – V_IN - enables –3.3V, –5V, or –12V generation from common inputs
Max output current	200mA guaranteed (0°C–70°C, V_IN > 4.5V, V_O = –5V) - sufficient for op-amp biasing and sensor signal conditioning
Switching frequency	160kHz fixed - balances EMI suppression, inductor size, and efficiency without external timing components
Reference voltage	1.25V ±7% (1.18V–1.32V) - sets output accuracy via resistor divider (R3/R4); enables <0.1%/V line regulation
Quiescent current	1.2mA (ON), 10µA (SHDN) - extends battery life in always-on monitoring systems with periodic wake-up
Efficiency	68% typical at 6V input, 100mA load - optimized for medium-power negative rail generation with minimal heat dissipation

Pinout & Package

ST755CN is housed in an SO-8 package (ECOPACK®, lead-free, 1.27mm pitch) with exposed pad not electrically connected. Thermal resistance is 160°C/W (junction-to-ambient, PCB-dependent).

Pin/Terminal	Circuit Role	Design Meaning
1 SHDN	Logic-controlled shutdown input	Active-low: GND = shutdown (10µA I_Q), V_CC = active; compatible with 1.8V/3.3V/5V microcontrollers
2 VREF	Internal 1.25V reference output	Provides precision feedback node for output voltage setting; used with R3/R4 divider per V_O = –V_REF(1 + R4/R3)
3 SS	Soft-start control	Capacitor-based ramp limits inrush current; voltage-driven current limit (see Fig.11); internal 1.2MΩ pull-up to VREF
4 CC	Compensation node	Error amplifier output; held at 0V during regulation; connects to RC network for loop stability
5 VO	Negative output terminal	Delivers regulated negative voltage; requires low-ESR output capacitor (e.g., 47µF ceramic + 100µF tantalum)
6 GND	Power and signal ground	Common return for input, output, and internal circuitry; must be low-impedance plane adjacent to LX and VO pins
7 LX	Switch node	Drives external inductor; peak current limited to 1.2A; requires careful layout to minimize ringing and EMI
8 VCC	Positive input supply	Accepts 2.7V–11V; powers internal circuitry and gate driver; bypass with 47µF/100µF low-ESR capacitors

Key Features

Feature	Design Value
Inverting topology with integrated P-MOSFET	Eliminates need for external high-side switch and level-shifting; simplifies design of isolated negative rails
Current-mode PWM control	Enables fast transient response, inherent cycle-by-cycle current limiting, and stable operation across wide load ranges
Low-noise output with soft-start	Reduces output voltage overshoot and inrush stress on downstream analog circuitry (e.g., ADC references, op-amps)
Mixed bipolar-CMOS (BCD) process	Delivers high-precision 1.25V reference (±7%), low quiescent current (1.2mA), and robust 185°C max junction temperature
Fixed 160kHz oscillator	Ensures predictable EMI profile and eliminates external timing component; reduces bill-of-materials and layout complexity

Applications

Portable Medical Sensors

Industrial Data Acquisition

Use Scenario: Battery-powered handheld ECG front-end requiring clean –5V rail for op-amp biasing and ADC reference.

IC Role / Device Role / Timing Role: Inverting DC-DC regulator generating stable negative supply from 3.7V Li-ion cell; operates in shutdown between measurements.

Use Value: 10µA shutdown current extends battery life; 68% efficiency minimizes self-heating near sensitive analog circuitry.

Use Scenario: 4–20mA loop-powered transmitter needing isolated –12V for dual-supply op-amps and DACs.

IC Role / Device Role / Timing Role: Negative voltage generator from 24V loop supply; configured for –12V output using R3/R4 feedback network.

Use Value: Guaranteed 200mA output supports multiple analog stages; 160kHz switching avoids interference with 4–20mA signal bandwidth.

Test & Measurement Equipment

Automotive Infotainment Audio

Use Scenario: Benchtop oscilloscope channel amplifier requiring ultra-low-noise ±5V supplies.

IC Role / Device Role / Timing Role: Low-noise inverting regulator for negative rail; soft-start prevents voltage glitches during power-up sequencing.

Use Value: Very low noise output and 0.1%/V line regulation ensure accurate signal fidelity; SO-8 package allows compact PCB layout.

Use Scenario: Head unit audio codec requiring –3.3V bias for Class-D amplifier input stage.

IC Role / Device Role / Timing Role: Adjustable negative regulator deriving –3.3V from 5V system rail; shutdown synchronized with MCU sleep mode.

Use Value: Logic-compatible SHDN pin enables seamless power management; 1.25V reference ensures tight output tolerance (<±3%) across temperature.

Equivalent & Alternatives

The following parts are listed as comparable options for similar inverting negative-output DC-DC regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2662CMX/NOPB	Charge-pump topology (no inductor), 100mA max, 99% efficiency at light loads, 1.2MHz switching	Limited to lower currents and smaller voltage differentials; unsuitable for >100mA or >–5.5V outputs	Select when board space is critical and output current ≤100mA; avoid for high-current analog rails.
MAX764CSA+	Current-mode inverting buck-boost, 250mA, 500kHz, 1.25V reference, SO-8 package	Higher switching frequency increases EMI risk; less efficient at 100–200mA loads (62% typ. vs. 68%)	Choose if higher frequency is acceptable and tighter output tolerance (±1.5%) is required; verify thermal performance at full load.

Compared with LM2662CMX/NOPB and MAX764CSA+, ST755CN delivers higher guaranteed output current (200mA), superior efficiency at medium loads, and lower noise due to its fixed-frequency current-mode architecture-making it optimal for precision analog negative rails where stability and load capability are prioritized over footprint.

Availability

ST755CN is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition systems, test & measurement equipment, and automotive infotainment audio requiring stable component supply and long-term obsolescence management.

Supply support for ST755CN 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 ICs, analog chips, and MEMS sensors for industrial, automotive, and consumer markets.

The ST755CN belongs to ST's legacy power management portfolio targeting low-noise, inverting DC-DC conversion for analog subsystems-designed specifically for applications needing reliable negative voltage rails from single positive supplies.

FAQ

What is the maximum allowable input-to-output differential voltage for ST755CN?

The absolute maximum input-to-output differential voltage is constrained by V_CC + |V_O| < 12.7V. For example, with a 6V input, the most negative output allowed is –6.6V. Exceeding this limit risks damage to the internal P-MOSFET and may trigger overvoltage protection failure. This constraint is defined in the Absolute Maximum Ratings table and verified in application testing.

Can ST755CN operate from a 2.7V input while delivering –5V at 200mA?

No. At V_IN = 2.7V, the guaranteed output current drops to 125mA (per Electrical Characteristics Table 5). To deliver 200mA at –5V, V_IN must exceed 4.5V. This limitation arises from reduced gate drive margin and conduction losses in the internal P-MOSFET at low input voltages.

How is output voltage set, and what tolerance does the feedback network introduce?

Output voltage is set by a resistor divider (R3 from VO to VREF, R4 from VREF to GND), per V_O = –V_REF(1 + R4/R3). With V_REF = 1.25V ±7% and typical 1% resistors, total output tolerance is ±8–10%. For tighter regulation, use 0.1% resistors and account for V_REF drift (50ppm/°C) over temperature.

Is ST755CN still in active production, and what is its obsolescence status?

ST755CN is marked as Obsolete by STMicroelectronics (per Device Summary Table 1). However, Aetrix Electronics maintains legacy inventory with full traceability and offers extended lifecycle support-including last-time-buy planning, cross-reference guidance, and engineering consultation for migration paths to functionally similar active alternatives.

ST755CN Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Function:: Step-Up/Step-Down

Output Configuration:: Negative

Topology:: Buck-Boost

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 2.4V

Voltage - Input (Max):: 11V

Voltage - Output (Min/Fixed):: -1.25V

Voltage - Output (Max):: -10.3V

Current - Output:: 200mA

Frequency - Switching:: 160kHz

Synchronous Rectifier:: No

Operating Temperature:: -40°C ~ 85°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 8-DIP

ST755CN FAQ

1.How can I place an order for ST755CN through Aetrix?

Please submit a Request for Quotation (RFQ) for ST755CN 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 ST755CN reliable?

The price and inventory of ST755CN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST755CN is usually 5 days.

3.What payment methods are accepted for ST755CN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST755CN transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST755CN?

ST755CN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST755CN 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 ST755CN?

For technical support, including ST755CN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST755CN requirements.

6.How does Aetrix verify that ST755CN is sourced from the original manufacturer or authorized distributors?

All ST755CN 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 ST755CN meets industry standards.

7.What is the process for return or replacement of ST755CN?

All ST755CN units undergo pre-shipment inspection (PSI). If there is an issue with ST755CN, 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 ST755CN part is unused and in its original packaging.

Return procedure for ST755CN:

1.Submit a request within 90 days.

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

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