Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

onsemi CS52015-1GST3

Name: CS52015-1GST3
Brand: onsemi
SKU: CS52015-1GST3
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: CS52015-1GST3

Manufacturer:: onsemi

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-261-4, TO-261AA

Datasheet:: CS52015-1GST3.pdf

Description:: IC REG LINEAR ADJ LDO REGULATOR

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,075

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

CS52015-1GST3 from onsemi is a 1.5 A adjustable linear regulator in SOT-223 package, delivering ±1.0% output voltage accuracy over temperature and supporting 1.25 V to 5.5 V output via external resistor divider. It features 1.05 V typical dropout at full load, fast transient response, and integrated current limit and thermal shutdown protection. It serves as a post-regulator or microprocessor supply in low-voltage, high-transient-demand systems.

For engineers reviewing the CS52015-1GST3 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 1.5 A, thermal shutdown threshold (150–210°C), output accuracy across −40°C to +70°C ambient, minimum load current requirement (0.6–2.0 mA), and SOT-223 thermal resistance (R_JA = 156°C/W).

Technical Context

The CS52015-1GST3 uses a composite PNP-NPN pass transistor architecture with internal bandgap reference and error amplifier feedback loop. Its regulation relies on maintaining a precise 1.254 V (typ) reference between VOUT and Adj pins, enabling programmable output via external R1/R2 divider.

It operates with input-to-output differential up to 7.0 V, supports stable operation with ≥22 µF tantalum output capacitance, and incorporates fault protection including current limiting (1.6–3.1 A) and thermal shutdown with 25°C hysteresis. The device requires no external compensation but mandates proper capacitor ESR for loop stability.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	1.5 A maximum continuous - supports high-current microprocessor core rails and FPGA I/O banks.
Output Voltage Range	1.25 V to 5.5 V adjustable - set by external resistor divider; enables flexible system-level voltage scaling.
Output Accuracy	±1.0% over −40°C to +70°C ambient - ensures tight regulation for sensitive analog/digital mixed-signal loads.
Dropout Voltage	1.05 V (typ) at 1.5 A - allows operation with minimal VIN–VOUT margin, critical for battery-powered or low-input designs.
Thermal Shutdown	150°C to 210°C activation range - protects against sustained overload or inadequate heatsinking in compact SOT-223 layout.
Ripple Rejection	80 dB at 120 Hz - suppresses low-frequency power supply noise, beneficial for ADC reference or audio subsystems.
Adjust Pin Current	50 µA (typ) - introduces small but calculable error in R2-based voltage setting; must be accounted for precision designs.

Pinout & Package

SOT-223 package (Case 318E, ST suffix), surface-mount, thermally enhanced with tab connected to VOUT. Requires PCB copper pour under tab for thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
1 - Adj	Adjust reference node	Low-side terminal of internal 1.254 V bandgap reference; connects to junction of R1/R2 divider to set output voltage.
2 - VOUT	Regulated output	Power output pin and electrically connected to exposed tab; must be tied to ground plane or heatsink with thermal compound if dissipating >0.5 W.
3 - VIN	Input supply	Unregulated input requiring ≥10 µF ceramic bypass; differential with VOUT must stay ≤7.0 V to avoid overstress.

Key Features

Feature	Design Value
Fast transient response	Stabilizes within microseconds after load step - maintains <±20 mV deviation during 1.5 A step (Fig. 9), critical for CPU burst-mode operation.
Low dropout voltage	1.05 V typ at 1.5 A - enables use with 3.3 V input to generate 2.5 V rail, reducing power loss vs. legacy regulators like LT1086.
Integrated protection	Current limit (1.6–3.1 A) + thermal shutdown (150–210°C) - eliminates need for external foldback or thermal sensors in space-constrained designs.
Stability with standard capacitors	Compatible with 22 µF tantalum or aluminum electrolytic output caps - avoids costly low-ESR ceramics while ensuring loop stability.
Adjustable sensing topology	Reference voltage referenced to Adj pin - permits Kelvin sensing at load via R1 placement, improving load regulation despite PCB trace resistance.

Applications

Microprocessor Core Supply	FPGA I/O Bank Regulator
Use Scenario: Providing clean, tightly regulated 1.2 V or 1.8 V to ARM Cortex-A series CPU cores with dynamic current draw up to 1.5 A. IC Role / Device Role / Timing Role: Primary post-regulator stepping down intermediate DC/DC output; handles rapid load transients during instruction execution bursts. Use Value: 1.05 V dropout enables efficient conversion from 3.3 V intermediate rail; ±1.0% accuracy ensures core logic timing margins are preserved across temperature.	Use Scenario: Powering configurable 2.5 V or 3.3 V I/O banks on Xilinx Artix-7 FPGAs where rail stability affects signal integrity and interface timing. IC Role / Device Role / Timing Role: Local point-of-load regulator placed adjacent to FPGA; supplies peak I/O switching current without compromising VCCIO noise floor. Use Value: 80 dB ripple rejection attenuates switching noise from upstream DC/DC converters; fast transient response prevents setup/hold violations during high-speed DDR interface activity.
Industrial PLC Analog Front-End	Medical Sensor Signal Chain
Use Scenario: Generating stable 5.0 V or 3.3 V for precision ADCs, op-amps, and isolated DACs in programmable logic controller modules operating in −40°C to +70°C environments. IC Role / Device Role / Timing Role: Low-noise analog supply rail generator; decouples digital switching noise from sensitive analog measurement circuitry. Use Value: ±1.0% output accuracy over full temperature range ensures consistent ADC reference scaling; low thermal drift minimizes calibration drift in field-deployed units.	Use Scenario: Powering low-power biosensor amplifiers and 16-bit SAR ADCs in portable ECG or pulse oximetry devices requiring long battery life and clinical-grade accuracy. IC Role / Device Role / Timing Role: Ultra-stable analog bias rail; supplies sensor front-end stages where PSRR and voltage drift directly impact diagnostic validity. Use Value: 1.25 V reference stability and <0.02%/W thermal regulation minimize offset drift; absence of switching artifacts avoids aliasing into narrowband physiological signals.

Microprocessor Core Supply

FPGA I/O Bank Regulator

Use Scenario: Providing clean, tightly regulated 1.2 V or 1.8 V to ARM Cortex-A series CPU cores with dynamic current draw up to 1.5 A.

IC Role / Device Role / Timing Role: Primary post-regulator stepping down intermediate DC/DC output; handles rapid load transients during instruction execution bursts.

Use Value: 1.05 V dropout enables efficient conversion from 3.3 V intermediate rail; ±1.0% accuracy ensures core logic timing margins are preserved across temperature.

Use Scenario: Powering configurable 2.5 V or 3.3 V I/O banks on Xilinx Artix-7 FPGAs where rail stability affects signal integrity and interface timing.

IC Role / Device Role / Timing Role: Local point-of-load regulator placed adjacent to FPGA; supplies peak I/O switching current without compromising VCCIO noise floor.

Use Value: 80 dB ripple rejection attenuates switching noise from upstream DC/DC converters; fast transient response prevents setup/hold violations during high-speed DDR interface activity.

Industrial PLC Analog Front-End

Medical Sensor Signal Chain

Use Scenario: Generating stable 5.0 V or 3.3 V for precision ADCs, op-amps, and isolated DACs in programmable logic controller modules operating in −40°C to +70°C environments.

IC Role / Device Role / Timing Role: Low-noise analog supply rail generator; decouples digital switching noise from sensitive analog measurement circuitry.

Use Value: ±1.0% output accuracy over full temperature range ensures consistent ADC reference scaling; low thermal drift minimizes calibration drift in field-deployed units.

Use Scenario: Powering low-power biosensor amplifiers and 16-bit SAR ADCs in portable ECG or pulse oximetry devices requiring long battery life and clinical-grade accuracy.

IC Role / Device Role / Timing Role: Ultra-stable analog bias rail; supplies sensor front-end stages where PSRR and voltage drift directly impact diagnostic validity.

Use Value: 1.25 V reference stability and <0.02%/W thermal regulation minimize offset drift; absence of switching artifacts avoids aliasing into narrowband physiological signals.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LT1086CT-ADJ	Higher 1.3 V typical dropout at 1.5 A; same SOT-223 pinout but lower accuracy (±1.5%) and no guaranteed thermal hysteresis spec.	Less suitable for ultra-low VIN–VOUT margin designs; wider output tolerance may require larger output capacitor for same load regulation.	Select CS52015-1GST3 when dropout <1.1 V and ±1.0% accuracy are mandatory; LT1086CT-ADJ remains viable for cost-sensitive, non-critical rails.
TLV1117-ADJ	Lower 800 mA max output; 1.2 V dropout at 800 mA; ±2% accuracy; smaller SOT-223-3 footprint but higher R_JA (200°C/W).	Not suitable for 1.5 A loads; thermal derating begins earlier; limited headroom for high-temperature industrial use.	Choose TLV1117-ADJ only for sub-1 A applications with relaxed accuracy; CS52015-1GST3 is required for full 1.5 A capability with robust thermal margin.

Compared with LT1086CT-ADJ and TLV1117-ADJ, the CS52015-1GST3 delivers superior dropout performance and tighter accuracy at full rated current, making it the only option among the three qualified for 1.5 A loads in thermally constrained SOT-223 layouts with <1.1 V VIN–VOUT margin.

Availability

CS52015-1GST3 is available at Aetrix Electronics and suitable for industrial PLCs, medical sensor modules, FPGA carrier boards, and embedded microprocessor systems requiring stable component supply with full production traceability and long-term lifecycle support.

Supply support for CS52015-1GST3 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.

The CS52015-1GST3 belongs to onsemi's high-current linear regulator product line, engineered specifically for post-regulation in power-sensitive embedded systems where low dropout, fast transient response, and integrated protection are essential design requirements.

FAQ

What is the maximum input-to-output voltage differential allowed for the CS52015-1GST3?

The CS52015-1GST3 has an absolute maximum supply voltage rating of 7.0 V between VIN and VOUT. Exceeding this differential risks permanent damage, especially during short-circuit conditions where thermal or current-limit protection may not activate fast enough. Designers must ensure the VIN–VOUT difference stays within 7.0 V at all times, including startup and fault states. This constraint applies regardless of output voltage setting or load condition.

Can the CS52015-1GST3 be used without an output capacitor?

No, the CS52015-1GST3 requires a minimum 22 µF tantalum or aluminum electrolytic output capacitor for stability, as specified in the datasheet. Omitting it or using low-ESR ceramic capacitors alone causes oscillation due to phase margin degradation in the control loop. The capacitor also supplies instantaneous load current during transients and reduces output ripple; stable operation is not guaranteed without proper output capacitance per Figure 1 and Stability Considerations section.

How does the adjust pin current affect output voltage accuracy in the CS52015-1GST3?

The CS52015-1GST3 adjust pin draws 50 µA (typical), which flows through the lower resistor (R2) of the external voltage divider and introduces a voltage error equal to I_Adj × R2. For example, with R2 = 10 kΩ, this adds ~0.5 V error - significant relative to the 1.25 V reference. To maintain ±1.0% accuracy, R2 must be sized so that I_Adj × R2 contributes <±12.5 mV, typically requiring R2 ≤ 250 Ω or active compensation techniques.

Is the CS52015-1GST3 pin-compatible with other SOT-223 linear regulators?

The CS52015-1GST3 uses standard SOT-223 pinout (Adj–VOUT–VIN), matching industry conventions for adjustable regulators. However, it is not fully pin-compatible with fixed-output SOT-223 regulators (e.g., AMS1117-3.3) due to different pin functions. Among adjustable types, it shares pin mapping with LT1086CT-ADJ, but differences in thermal characteristics, dropout, and protection behavior require validation before drop-in replacement.

What thermal management is required for the CS52015-1GST3 at 1.5 A output in SOT-223 package?

At 1.5 A and 1.05 V dropout, the CS52015-1GST3 dissipates ~1.58 W. With R_JA = 156°C/W (SOT-223, no heatsink), junction temperature rise would exceed 245°C - far above the 150°C thermal shutdown threshold. A minimum 200 mm² copper pour under the tab (1 oz Cu, 1 layer) is mandatory; for continuous 1.5 A operation, a small external heatsink or forced airflow is strongly recommended to keep T_J < 125°C.

CS52015-1GST3 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-261-4, TO-261AA

Packaging:: Bulk

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Adjustable

Number of Regulators:: 1

Voltage - Input (Max):: 7V

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

Voltage - Output (Max):: 5.5V

Voltage Dropout (Max):: 1.4V @ 1.5A

Current - Output:: 1.5A

Current - Quiescent (Iq):: 2 mA

Current - Supply (Max):: -

PSRR:: 80dB (120Hz)

Control Features:: -

Protection Features:: Over Current, Over Temperature

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223 (TO-261)

CS52015-1GST3 FAQ

1.How can I place an order for CS52015-1GST3 through Aetrix?

Please submit a Request for Quotation (RFQ) for CS52015-1GST3 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 CS52015-1GST3 reliable?

The price and inventory of CS52015-1GST3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS52015-1GST3 is usually 5 days.

3.What payment methods are accepted for CS52015-1GST3?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS52015-1GST3 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CS52015-1GST3?

CS52015-1GST3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CS52015-1GST3 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 CS52015-1GST3?

For technical support, including CS52015-1GST3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS52015-1GST3 requirements.

6.How does Aetrix verify that CS52015-1GST3 is sourced from the original manufacturer or authorized distributors?

All CS52015-1GST3 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 CS52015-1GST3 meets industry standards.

7.What is the process for return or replacement of CS52015-1GST3?

All CS52015-1GST3 units undergo pre-shipment inspection (PSI). If there is an issue with CS52015-1GST3, 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 CS52015-1GST3 part is unused and in its original packaging.

Return procedure for CS52015-1GST3:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

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.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

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…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

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…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

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…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

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 …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

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…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

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…