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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - LinearRT9018B-15GSP
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RT9018B-15GSP - Richtek USA Inc.

Manufacturer Part Number
RT9018B-15GSP
Manufacturer
Richtek
Allelco Part Number
32D-RT9018B-15GSP
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
5,120 pcs available, New & Original
Parts Description
IC REG LIN POS ADJ 3A 8SOP
Package
8-SOP-EP
Data sheet
RT9018B-15GSP.pdf

Environmental Information

RoHS Declaration.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 5120

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Specifications

RT9018B-15GSP Tech Specifications
Richtek USA Inc. - RT9018B-15GSP technical specifications, attributes, parameters and parts with similar specifications to Richtek USA Inc. - RT9018B-15GSP

Product Attribute Attribute Value
Manufacturer Richtek
Voltage Dropout (Max) 0.35V @ 3A
Voltage - Output (Min/Fixed) 0.8V (1.5V)
Voltage - Output (Max) 5.15V
Voltage - Input (Max) 5.5V
Supplier Device Package 8-SOP-EP
Series -
Protection Features Over Current, Over Temperature
Package / Case 8-SOIC (0.154', 3.90mm Width) Exposed Pad
Package Tape & Reel (TR)
Product Attribute Attribute Value
PSRR -
Output Type Adjustable (Fixed)
Output Configuration Positive
Operating Temperature -40°C ~ 85°C
Number of Regulators 1
Mounting Type Surface Mount
Current - Quiescent (Iq) 1.2 mA
Current - Output 3A
Control Features Enable, Power Good
Base Product Number RT9018

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

RT9018B-15GSP Image
RT9018B-15GSP (1)

Manufacturer Part Number

RT9018B-15GSP

Manufacturer

richtek

Introduction

The RT9018B-15GSP is a high-performance, low-dropout (LDO) linear regulator from Richtek. It is designed to provide a stable and accurate output voltage from a wide range of input voltages, making it suitable for a variety of power supply applications.

Product Features and Performance

Adjustable output voltage range from 0.8V to 5.15V

Maximum output current of 3A

Low dropout voltage of 0.35V at 3A

Low quiescent current of 1.2mA

Enable and power good control features

Over-current and over-temperature protection

Operating temperature range of -40°C to 85°C

Surface mount 8-SOIC package with exposed pad

Product Advantages

Excellent line and load regulation for stable output voltage

High efficiency and low power consumption

Compact and thermally-enhanced package for space-constrained designs

Robust protection features for reliable operation

Key Reasons to Choose This Product

High performance and versatile voltage regulation

Efficient and low-power design for extended battery life

Reliable operation with advanced protection features

Suitable for a wide range of power supply applications

Quality and Safety Features

Robust design and construction for long-term reliability

Compliance with industry safety and environmental standards

Compatibility

The RT9018B-15GSP is compatible with a wide range of electronic devices and systems that require a stable and accurate power supply.

Application Areas

Portable electronics

Industrial automation

Telecommunications equipment

Automotive electronics

Product Lifecycle

The RT9018B-15GSP is an active product, and there are no known equivalent or alternative models available at this time. If you have any further questions or require additional information, please contact our sales team through our website.

Frequently Asked Questions(FAQ)

How does the RT9018B-15GSP perform in terms of voltage dropout when delivering 3A of continuous current, and what design considerations should be made for systems with limited input-output differential?
The RT9018B-15GSP exhibits a maximum voltage dropout of 0.35V at 3A output current, meaning that for stable operation under full load, the input voltage must remain at least 0.35V above the selected output voltage. This characteristic becomes critical in battery-powered or low-voltage systems where headroom is constrained. For example, when regulating down to 1.5V from a 2.0V source, the regulator operates near its minimum allowable input level, increasing susceptibility to transient drops and reducing efficiency. Designers must account for this by ensuring sufficient input margin across all operating conditions, especially during load transients or battery discharge.
What are the key differences between using the RT9018B-15GSP in fixed versus adjustable mode, and how do these configurations affect system flexibility and thermal performance?
The RT9018B-15GSP supports both fixed and adjustable output modes through internal configuration, with fixed outputs typically set at 1.5V and adjustable outputs ranging from 0.8V to 5.15V. Fixed-mode operation simplifies PCB layout and reduces external component count, but offers less flexibility. In contrast, adjustable mode allows customization of the output voltage using two external resistors, enabling optimization for specific power rails. However, the adjustable configuration introduces minor additional quiescent current due to feedback network loading. Thermally, both modes behave similarly under identical output currents and input voltages, as the core regulation mechanism remains unchanged. The choice depends on whether system-level voltage standardization or dynamic rail adjustment is prioritized.
Can the RT9018B-15GSP safely operate with an input voltage of 5.5V while outputting 5.15V at 3A, and what protection mechanisms ensure reliability in such high-efficiency scenarios?
Yes, the RT9018B-15GSP can operate with an input of 5.5V while delivering up to 5.15V at 3A, as this falls within its specified input-to-output differential limit. At this condition, the dropout voltage approaches zero, improving efficiency—potentially exceeding 95% depending on load. Despite high efficiency, the device includes robust protection features: over-current protection (OCP) limits output current to prevent damage during short circuits, while over-temperature protection (OTP) shuts down the regulator if junction temperature exceeds safe thresholds. These safeguards ensure reliable operation even under sustained overload or poor thermal management, such as inadequate heatsinking or high ambient temperatures.
How does the quiescent current of 1.2 mA impact battery life in portable applications using the RT9018B-15GSP, and under what load conditions is it most significant?
With a quiescent current of 1.2 mA, the RT9018B-15GSP contributes significantly to total system current draw in low-power, standby-heavy applications. For instance, in a device that spends 90% of its time in sleep mode drawing only 10 μA from the regulated rail, the regulator’s own 1.2 mA Iq represents a 12-fold increase in base current, directly reducing battery runtime. This effect is most pronounced when the output load is minimal or intermittent. To mitigate this, designers might consider switching regulators for auxiliary rails or implementing enable control to power down the regulator during deep sleep phases.
What mounting and thermal considerations apply when integrating the RT9018B-15GSP into a compact industrial PCB, and how does the exposed pad enhance performance?
The RT9018B-15GSP uses an 8-SOP-EP package with an exposed thermal pad designed for direct solder connection to the PCB copper plane. This improves heat dissipation by spreading thermal energy across the board, lowering junction temperature by several degrees compared to non-exposed alternatives. In dense industrial designs where space is limited, this feature allows higher continuous current without derating, provided adequate copper area (e.g., 4–6 square inches) and thermal vias are implemented. Failure to connect the exposed pad properly can lead to premature thermal shutdown or reduced reliability under sustained loads.
How does the operating temperature range of -40°C to 85°C influence component selection for automotive or outdoor applications using the RT9018B-15GSP?
The -40°C to 85°C commercial temperature grade indicates suitability for standard industrial environments but not full automotive AEC-Q100 qualification. While sufficient for many non-automotive embedded systems, including those in outdoor enclosures subject to seasonal extremes, this range may limit deployment in vehicles requiring extended thermal cycling or operation beyond ±125°C. Designers assessing long-term stability in harsh climates must verify that both the regulator and surrounding components maintain functionality across the full expected temperature span, factoring in derating curves for voltage, current, and thermal resistance.
What role do the Enable and Power Good functions play in system-level power sequencing when using the RT9018B-15GSP?
The Enable pin allows software-controlled startup and shutdown, supporting intelligent power sequencing in multi-rail systems. When pulled high, the regulator activates; pulling low disables it, conserving power during inactive states. The Power Good (PG) signal provides feedback indicating whether the output voltage is within regulation thresholds—typically asserted after startup delay and deasserted during faults. This enables microcontrollers to monitor supply integrity and initiate safe shutdown procedures, preventing brownouts or corrupted data during unexpected power loss. Proper use of PG enhances system robustness in applications like IoT gateways or motor controllers requiring ordered power-up sequences.
Why might a designer choose the RT9018B-15GSP over a switching regulator despite lower overall efficiency, and what trade-offs are involved?
The RT9018B-15GSP offers superior noise immunity and simplicity in noise-sensitive analog subsystems, such as RF frontends or sensor interfaces, where switching regulators introduce broadband EMI. Its linear regulation ensures clean output waveforms without high-frequency ripple, crucial for precision measurements. Additionally, it requires fewer external components and has faster transient response than most buck converters. However, the trade-off is reduced efficiency at large input-output differentials, increased power dissipation as heat, and higher input current for the same output—factors that make it suboptimal for battery-operated or thermally constrained applications. The choice hinges on prioritizing signal integrity over energy economy.
How does the Moisture Sensitivity Level (MSL) of 3 (168 hours) affect manufacturing handling and shelf-life planning for the RT9018B-15GSP?
An MSL of 3 indicates that the RT9018B-15GSP must be assembled within 168 hours (one week) after opening the humidity barrier bag to prevent moisture absorption, which could cause popcorning during reflow soldering. Manufacturers must track floor life carefully, especially in humid environments, and re-bake devices if the window expires. This requirement aligns with standard JEDEC guidelines for surface-mount components and necessitates proper inventory rotation and packaging protocols in high-volume production. Neglecting MSL compliance risks catastrophic failure during thermal processing, particularly in lead-free reflow profiles exceeding 245°C.
What compliance statuses (RoHS, REACH, ECCN) indicate about the environmental and regulatory acceptability of the RT9018B-15GSP in global markets?
The RT9018B-15GSP is RoHS3 compliant, confirming absence of restricted substances like lead, mercury, and cadmium above mandated thresholds. It is also REACH unaffected, indicating no SVHC (Substance of Very High Concern) content requiring disclosure under EU regulations. With an ECCN classification of EAR99, it is not subject to U.S. export controls and qualifies for worldwide shipment without special licensing, simplifying international distribution. These attributes support inclusion in consumer electronics, medical devices, and industrial equipment targeting multiple geographic markets without additional certification overhead.

Parts with Similar Specifications

The three parts on the right have similar specifications to Richtek USA Inc. RT9018B-15GSP

Product Attribute RT9018B-18GSP RT9018B-25GSP RT9018B-10GSP RT9018B-1KGSP
Part Number RT9018B-18GSP RT9018B-25GSP RT9018B-10GSP RT9018B-1KGSP
Manufacturer Richtek USA Inc. Richtek USA Inc. Richtek USA Inc. Richtek USA Inc.
Voltage - Output (Min/Fixed) - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Output Configuration - - - -
Current - Quiescent (Iq) - - - -
Series - - - -
Voltage - Output (Max) - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Number of Regulators - - - -
Control Features - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Base Product Number - DAC34H84 MAX500 ADS62P42
Mounting Type - Surface Mount Through Hole Surface Mount
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Current - Output - - - -
Protection Features - - - -
Voltage Dropout (Max) - - - -
Voltage - Input (Max) - - - -
PSRR - - - -
Output Type - Current - Unbuffered Voltage - Buffered -

RT9018B-15GSP Datasheet PDF

Download RT9018B-15GSP pdf datasheets and Richtek USA Inc. documentation for RT9018B-15GSP - Richtek USA Inc..

Datasheets
Cylindrical Battery Holders.pdf
Environmental Information
RoHS Declaration.pdf

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Customer Reviews

Evaluation: 10 Articles

  • ECUb***h
    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

  • RS48***ieldTech
    Sep 16, 2026

    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

  • Logi***b_Chris
    Sep 8, 2026

    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

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Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
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RT9018B-15GSP Image

RT9018B-15GSP

Richtek USA Inc.
32D-RT9018B-15GSP

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