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Renesas RTKA211803DE0000BU
- Part No.:
- RTKA211803DE0000BU
- Manufacturer:
- Renesas
- Package:
- Datasheet:
-
RTKA211803DE0000BU.pdf
- Description:
- EVAL BOARD FOR RAA211803
- Quantity:
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Inventory:2,301
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Product details
Overview
RTKA211803DE0000BU from Renesas Electronics is a 300mA, ultra-low-quiescent-current (5.5µA at 80V no-load switching) buck regulator in TSOT23-5 package, delivering fixed 3.3V output across 7–80V input. It integrates high-side MOSFET, supports pre-biased startup, and provides OVP, UVLO, OTP, and overcurrent protection. Used in industrial I/O supplies and e-bike auxiliary power rails.
For engineers reviewing the RTKA211803DE0000BU datasheet, RTKA211803DE0000BU pinout, RTKA211803DE0000BU application, or RTKA211803DE0000BU equivalent, key selection criteria include its 75ns minimum on-time, variable-frequency operation via external inductor (10–33µH), EN threshold accuracy (2.55V typ), and guaranteed operation from –40°C to +125°C junction temperature.
Technical Context
The RTKA211803DE0000BU operates in discontinuous conduction mode (DCM) using valley-based voltage-mode control with fixed peak current limit (750mA typ) and zero-current detection. Its switching frequency varies with load, inductor value, and input voltage-e.g., ~170kHz max with 33µH at full load.
It features integrated thermal shutdown (160°C trip, 20°C hysteresis), accurate enable threshold (2.55V ±0.11V), and VIN UVLO (6.5V rising, 550mV hysteresis). The device sustains operation without external compensation and supports monotonic, glitch-free startup into pre-biased outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7V to 80V - enables direct replacement of wide-input LDOs in 12V/24V/48V industrial systems without external step-down stages. |
| Output Voltage | Fixed 3.3V ±3.6% - tightly regulated for MCU core/logic supply without external feedback resistors. |
| Max Output Current | 300mA - sufficient for powering microcontrollers, sensors, and interface ICs in embedded nodes. |
| Quiescent Current | 5.5µA at 80V, no load, switching - extends battery life in always-on e-bike or IoT edge devices. |
| Min On-Time | 75ns - supports high VIN-to-VOUT ratios (e.g., 80V→3.3V) while maintaining stable regulation at light loads. |
| Protection Features | VIN UVLO, VOUT OVP (3.63V), OTP (160°C), OC limit (750mA) - eliminates need for discrete protection circuitry in harsh environments. |
| Package | TSOT23-5 (2.9mm × 1.63mm) - surface-mount footprint compatible with automated assembly and space-constrained PCBs. |
Pinout & Package
RTKA211803DE0000BU is housed in a thermally enhanced TSOT23-5 package (2.9mm × 1.63mm, 0.95mm height), optimized for high-voltage isolation and low thermal resistance (θJA = 85°C/W on evaluation board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output & internal bias rail | Supplies internal circuitry after startup; connects directly to output capacitor; must be decoupled per layout guidelines. |
| GND (Pin 2) | Power and signal reference ground | Low-impedance return path for SW node current and internal logic; requires solid copper pour under package. |
| EN (Pin 3) | Enable control input | High-voltage tolerant (up to VIN+0.3V); 2.55V threshold allows direct connection to VIN or logic-level signals; hysteresis prevents chatter. |
| VIN (Pin 4) | Main power input | Connects to high-side MOSFET source; accepts 7–80V; UVLO ensures safe start-up only above 6.5V. |
| SW (Pin 5) | Switch node | Drain of integrated high-side MOSFET; connects to inductor and Schottky diode; requires short, low-inductance trace. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ (5.5µA) | Enables >10-year battery life in maintenance-free industrial sensors powered from 24V batteries or energy harvesters. |
| Pre-biased output startup | Allows seamless integration into redundant power systems where multiple regulators share a common output bus without reverse current or voltage glitches. |
| Variable switching frequency | Automatically adjusts frequency with load and inductor value-eliminates need for external frequency programming components. |
| Monotonic soft-start | Guarantees controlled VOUT ramp (230–440µs depending on inductor/load), preventing inrush current damage to downstream capacitors and ICs. |
| Integrated protections | Reduces BOM count by embedding UVLO, OVP, OTP, and OC limit-no external comparators, timers, or sense resistors required. |
Applications
| Industrial I/O Power | E-Bike Auxiliary Supply |
|---|---|
Use Scenario: Powering isolated digital I/O modules in PLC backplanes operating from 24V or 48V DC rails. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator supplying FPGA configuration logic, level translators, and optocoupler drivers. Use Value: Eliminates need for inefficient linear regulators; 5.5µA IQ reduces standby power draw below 132µW at 24V input. | Use Scenario: Generating 3.3V for display controllers, BLE modules, and battery management ICs in e-bikes with 36V–42V nominal battery packs. IC Role / Device Role / Timing Role: Secondary DC/DC stage stepping down from main 42V battery to logic supply; withstands load dumps up to 80V. Use Value: 80V absolute max rating and robust UVLO prevent latch-up during regenerative braking transients. |
| Home Automation Hub | Embedded Sensor Node |
Use Scenario: Providing clean 3.3V power to Wi-Fi SoCs and environmental sensors in smart home gateways powered from 12V wall adapters. IC Role / Device Role / Timing Role: Main system regulator enabling always-on connectivity with fast wake-from-sleep response. Use Value: 75ns min on-time ensures stable regulation even as adapter voltage sags to 7V under overload conditions. | Use Scenario: Battery-powered wireless sensor node requiring multi-year operation on two AA cells (3V) boosted to 80V intermediate rail then stepped to 3.3V. IC Role / Device Role / Timing Role: Final-stage point-of-load regulator accepting wide-input HV rail from boost converter. Use Value: Fixed 3.3V output and no external feedback simplify design; 4.5µA non-switching IQ extends shelf life during storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RTKA211805DE0000BU | Fixed 5V output; identical IQ, protections, and package; same pinout and layout compatibility. | Used where 5V logic or USB-peripheral interfaces require native 5V supply instead of 3.3V. | Select RTKA211805DE0000BU when system requires 5V output; otherwise retain RTKA211803DE0000BU for 3.3V MCU cores. |
| TPS63020DSJR | Buck-boost topology; 1.8–5.5V input; 3.3V/2A output; higher IQ (30µA); different pinout and control scheme. | Suitable for battery-powered systems with varying input (e.g., single Li-ion), but lacks 80V input capability. | Choose TPS63020DSJR only for sub-6V input applications; RTKA211803DE0000BU remains optimal for industrial 24V/48V/72V inputs. |
Compared with RTKA211805DE0000BU, the RTKA211803DE0000BU offers identical performance except for fixed 3.3V output-enabling drop-in substitution in 3.3V designs. Versus TPS63020DSJR, it delivers superior high-voltage resilience and lower IQ but lacks buck-boost flexibility, making it purpose-built for fixed-rail industrial conversion.
Availability
RTKA211803DE0000BU is available at Aetrix Electronics and suitable for industrial automation, e-bike electronics, and embedded sensor node designs requiring stable component supply across extended product lifecycles.
Supply support for RTKA211803DE0000BU 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
Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and IoT markets.
The RAA21180x family was designed specifically for ultra-low-power, wide-input industrial DC/DC conversion-targeting applications where reliability, small size, and minimal standby consumption outweigh cost sensitivity.
FAQ
What is the maximum input voltage rating for RTKA211803DE0000BU?
The RTKA211803DE0000BU has an absolute maximum input voltage rating of 84V, with recommended continuous operation up to 80V. This rating enables use in 48V and 72V industrial systems, including e-bike battery stacks and PoE++ infrastructure, while maintaining margin against load-dump transients.
Does RTKA211803DE0000BU require external feedback resistors to set output voltage?
No, RTKA211803DE0000BU does not require external feedback resistors. It integrates precision internal resistors to deliver a fixed 3.3V output with ±3.6% tolerance across temperature and line conditions-reducing component count and layout complexity versus adjustable regulators.
Can RTKA211803DE0000BU start up into a pre-biased output voltage?
Yes, RTKA211803DE0000BU supports pre-biased output startup. When enabled with existing voltage on VOUT, it enters a no-switching state until the output drops below the valley comparator threshold, then initiates monotonic soft-start-preventing reverse current and ensuring glitch-free operation in redundant power architectures.
What is the typical quiescent current of RTKA211803DE0000BU at 80V input with no load?
The typical quiescent current of RTKA211803DE0000BU is 5.5µA at 80V input, no load, and active switching. In shutdown (EN = 0V), it drops to 0.3µA typical, making it ideal for battery-backed systems requiring decades of shelf life and years of operational runtime.
Is RTKA211803DE0000BU pin-compatible with other devices in the RAA2118xx family?
Yes, RTKA211803DE0000BU is pin-compatible with RTKA211805DE0000BU and all RAA21180x variants in TSOT23-5 package. They share identical pinout, thermal characteristics, and protection architecture-allowing one PCB layout to support both 3.3V and 5V versions via BOM change only.
RTKA211803DE0000BU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Packaging:
- Box
- Product Status:
- Active
- Main Purpose:
- DC/DC, Step Down
- Outputs and Type:
- 1 Non-Isolated Output
- Voltage - Output:
- -
- Current - Output:
- 3.3V
- Voltage - Input:
- 300mA
- Regulator Topology:
- 7V ~ 80V
- Frequency - Switching:
- Buck
- Contents:
- -
- Utilized IC / Part:
- Board(s)
- Power - Output:
- RAA211803
RTKA211803DE0000BU FAQ
1.How can I place an order for RTKA211803DE0000BU through Aetrix?
Please submit a Request for Quotation (RFQ) for RTKA211803DE0000BU 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 RTKA211803DE0000BU reliable?
The price and inventory of RTKA211803DE0000BU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RTKA211803DE0000BU is usually 5 days.
3.What payment methods are accepted for RTKA211803DE0000BU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RTKA211803DE0000BU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RTKA211803DE0000BU?
RTKA211803DE0000BU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RTKA211803DE0000BU 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 RTKA211803DE0000BU?
For technical support, including RTKA211803DE0000BU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RTKA211803DE0000BU requirements.
6.How does Aetrix verify that RTKA211803DE0000BU is sourced from the original manufacturer or authorized distributors?
All RTKA211803DE0000BU 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 RTKA211803DE0000BU meets industry standards.
7.What is the process for return or replacement of RTKA211803DE0000BU?
All RTKA211803DE0000BU units undergo pre-shipment inspection (PSI). If there is an issue with RTKA211803DE0000BU, 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 RTKA211803DE0000BU part is unused and in its original packaging.
Return procedure for RTKA211803DE0000BU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RTKA211803DE0000BU Tags
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DFR0571
DFRobot
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DFR0379
DFRobot
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DFR0205
DFRobot
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1385
Adafruit Industries LLC
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COM-15208
SparkFun Electronics
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1944
Adafruit Industries LLC
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2465
Adafruit Industries LLC
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DC2468A
Analog Devices Inc.
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DC2841A
Analog Devices Inc.
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TPS552892EVM-111
Texas Instruments
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TPS55289EVM-093
Texas Instruments
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EPC9158
EPC
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