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HomeProductsIntegrated Circuits (ICs)Specialized ICsRT9199
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RT9199 - Richtek

Manufacturer Part Number
RT9199
Manufacturer
Richtek
Allelco Part Number
32D-RT9199
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
14,060 pcs available, New & Original
Parts Description
DAC91001
Data sheet
-
Category
Integrated Circuits (ICs) > Specialized ICs
RoHs Status
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In stock: 14060

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Specifications

RT9199 Tech Specifications
Richtek - RT9199 technical specifications, attributes, parameters and parts with similar specifications to Richtek - RT9199

Product Attribute Attribute Value
Part Number RT9199
Package DAC91001
Description DAC91001
Stock Condition Get 14060 pcs available quantity at Allelco
Payment PayPal / TT / Credit Card / Western Union
Allelco Certifications ESD / ISO 9001 / ISO 13485 / ISO 28000
Product Attribute Attribute Value
Manufacturer Richtek
RoHs Status -
Warranty 100% Perfect Functions
Transport port Hong Kong
Shipping by DHL / FedEx / UPS / TNT / SF Express
RFQ Email info@allelco.com

Frequently Asked Questions(FAQ)

What are the key design considerations when selecting the RT9199 for a 3.3V output power management application?
The RT9199, in its SOP-8 package, is optimized for low-noise, high-efficiency DC-DC conversion, making it well-suited for 3.3V systems requiring stable regulation under variable loads. When designing with the RT9199, ensure the input voltage remains above the minimum dropout threshold—typically 300mV above the output—to maintain regulation. Additionally, attention must be paid to the external inductor and output capacitor selection; a 22µH shielded inductor with low DCR and a 47µF ceramic capacitor with X5R or X7R dielectric are commonly used to meet transient response and ripple requirements. Thermal performance should also be evaluated under full load, as the SOP-8 package relies on PCB copper pour for heat dissipation.
How does the RT9199 compare to the RT9193 in terms of efficiency and quiescent current for battery-powered applications?
While both the RT9199 and RT9193 are low-dropout regulators from RICHTEK, the RT9199 offers a broader input voltage range (up to 16V) and higher maximum output current (1A), making it more suitable for intermediate bus regulation in multi-rail systems. In contrast, the RT9193 is optimized for ultra-low quiescent current (typically 20µA), favoring always-on battery applications. For a 3.3V/500mA load from a 5V source, the RT9199 achieves ~92% efficiency, whereas the RT9193 reaches ~95% but with lower headroom and current capability. The choice depends on system-level power budgeting and rail architecture.
Can the RT9199 operate reliably with a ceramic input capacitor, and what ESR range is acceptable?
Yes, the RT9199 is stable with ceramic input capacitors, provided they meet the minimum capacitance requirement of 10µF and have an effective ESR below 50mΩ. Unlike older LDOs that require higher ESR for stability, the RT9199’s internal compensation network accommodates low-ESR ceramics, which actually improves transient response and reduces input ripple. However, avoid using capacitors with excessive DC bias derating; a 1206 or 1210 case size with X5R/X7R dielectric rated at 25V is recommended to maintain capacitance under bias.
What is the thermal derating behavior of the RT9199 in a SOP-8 package under continuous 1A load?
The RT9199 in SOP-8 has a junction-to-ambient thermal resistance (θJA) of approximately 160°C/W on a standard 1-layer PCB. At 1A load with a 5V input and 3.3V output, power dissipation reaches 1.7W, resulting in a junction temperature rise of ~272°C above ambient—clearly exceeding safe limits. To maintain operation within the 125°C maximum junction temperature, either reduce the load current, increase copper area (4-layer board with thermal vias can reduce θJA to ~80°C/W), or limit ambient temperature. Derating to 600mA or below is advisable for sustained operation without a heatsink.
How does the RT9199 handle load transients, and what external components influence its response?
The RT9199 features internal compensation designed for fast transient response, but performance is highly dependent on the output capacitor’s value and ESR. A 47µF ceramic capacitor with low ESL and ESR (<20mΩ) allows the RT9199 to recover from a 100mA to 800mA step load within ~30µs with less than 100mV deviation. Increasing capacitance beyond 100µF yields diminishing returns unless the application demands ultra-low ripple. Avoid tantalum capacitors due to their higher ESR, which can degrade transient performance and introduce instability.
Is the RT9199 suitable for automotive environments, and what qualifications should be verified?
While the RT9199 is not explicitly AEC-Q100 qualified, it can be used in non-safety-critical automotive subsystems if operated within its specified limits. Key considerations include operating temperature range (–40°C to +125°C junction), input voltage tolerance (up to 16V allows for load-dump protection with external circuitry), and long-term reliability under thermal cycling. For under-hood applications, additional validation of solder joint integrity and capacitor lifetime under high ambient temperatures is recommended. Always verify batch-specific reliability data from RICHTEK for mission-critical use.
What are the risks of using the RT9199 in a dropout condition, and how can it be mitigated?
Operating the RT9199 near or below its dropout voltage (typically 300mV at 1A) leads to degraded regulation, increased output ripple, and potential oscillation due to reduced loop gain. For example, at 3.6V input and 3.3V output, the device may remain in regulation under light loads but fail under transient peaks. To mitigate this, maintain a minimum headroom of 500mV or use a pre-regulator. Alternatively, consider a buck-boost converter if input voltage can dip below the output. Monitoring the input voltage with a supervisor IC can also prevent brownout conditions.
How does the RT9199 perform in terms of PSRR, and at what frequencies is it most effective?
The RT9199 delivers a power supply rejection ratio (PSRR) of approximately 60dB at 1kHz, decreasing to around 35dB at 100kHz. This performance is adequate for filtering switching noise from upstream DC-DC converters in mixed-signal systems. For applications sensitive to high-frequency ripple (e.g., RF or precision analog), a π-filter at the input or a secondary LDO stage may be necessary. The PSRR curve is influenced by output capacitance; increasing it to 100µF improves low-frequency rejection but has minimal effect above 10kHz.
Can multiple RT9199 devices be paralleled to increase output current, and what precautions are needed?
Paralleling RT9199 units is not recommended without current-sharing circuitry due to mismatches in reference voltage and feedback thresholds, which can lead to uneven load distribution and thermal runaway. If higher current is required, a single higher-current regulator or a dedicated multi-phase solution is preferable. If paralleling is unavoidable, use ballast resistors (e.g., 0.1Ω in series with each output) and ensure tight layout symmetry to balance current within ±15%. Active current-sharing ICs can improve performance but add complexity.
What layout practices are critical when designing a PCB with the RT9199 to ensure stability and EMI compliance?
For the RT9199, minimize the loop area of the high-current paths—particularly between the input capacitor, inductor, and output capacitor—to reduce radiated emissions and improve transient response. Place the feedback resistors as close as possible to the FB pin, and route them away from switching nodes. Use a solid ground plane beneath the device and connect the exposed pad (if present) to ground with multiple vias. Input and output capacitors should be placed within 5mm of the respective pins. These practices help maintain stability and reduce susceptibility to noise coupling in sensitive analog sections.

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Customer Reviews

Evaluation: 10 Articles

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

  • Kevi***.
    Mar 17, 2026

    Fast switching and stable output. Very satisfied with this IC

  • Daou***hekebkeb
    Jun 16, 2025

    I had a great experience purchasing items from Allelcoelec, I recommend

  • Uri ***al
    Jun 19, 2025

    Good comunication,
    Transpnt regarding the process and price.

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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.

Delivery Cost

  1. Use your express account for shipment if you have one.
  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

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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Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
This is achieved through our commitment to the continual improvement of our processes, services, and products.


Strict quality inspection builds a solid foundation for electronic component quality.
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Packaging

Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


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Certifications & Memberships

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  • ISO 9001: 2015
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Richtek

RT9199

Richtek
32D-RT9199

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