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Renesas RTKA211405DE0000BU
- Part No.:
- RTKA211405DE0000BU
- Manufacturer:
- Renesas
- Package:
- Datasheet:
-
RTKA211405DE0000BU.pdf
- Description:
- EVAL BOARD FOR RAA211405
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Product details
Overview
RTKA211405DE0000BU from Renesas Electronics is a 5V fixed-output, 300mA ultra-low-quiescent-current buck regulator in TSOT23-5 package, operating from 7V to 40V input. It delivers 4µA IQ at 40V no-load switching, features 75ns minimum on-time, and integrates overcurrent, overtemperature, input UVLO, and output OVP protections. It serves as a high-efficiency replacement for LDOs in industrial I/O supplies and e-bike control modules.
For engineers reviewing the RTKA211405DE0000BU datasheet, RTKA211405DE0000BU pinout, RTKA211405DE0000BU application, or RTKA211405DE0000BU equivalent, key selection criteria include its 5V fixed output, 4µA quiescent current at 40V, TSOT23-5 thermal performance (θJA = 90°C/W), programmable frequency via external inductor (4.7–15µH), and pre-biased monotonic startup capability.
Technical Context
The RTKA211405DE0000BU employs boundary conduction mode (BCM) with valley-based VOUT sensing and fixed 750mA peak current limit. Its control loop relies on zero-current detection and a 1.2V internal reference, requiring output ripple for regulation-no external feedback resistors needed.
It implements variable-frequency operation where switching frequency scales with load current and inductor value: 10µH yields up to ~380kHz at full load (300mA), while 15µH limits max frequency to ~210kHz. Thermal shutdown activates at 160°C junction temperature with 20°C hysteresis, and EN threshold is precisely 1.23V typical with 75mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7V to 40V - supports wide industrial bus rails including 12V, 24V, and 36V systems without external pre-regulation. |
| Output Voltage | Fixed 5.0V ±1.5% - eliminates need for external feedback network; stable across -40°C to +125°C TJ. |
| Max Output Current | 300mA - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained embedded designs. |
| Quiescent Current | 4µA at 40V, no load, switching - enables >10-year battery life in always-on industrial monitoring nodes. |
| Min On-Time | 75ns - allows regulation at high VIN/VOUT ratios (e.g., 40V→5V) without pulse-skipping instability. |
| Switching Frequency Range | Programmable via inductor (4.7–15µH); 10µH yields ~380kHz max at full load - balances EMI, efficiency, and component size. |
| OVP Threshold | 5.5V - protects downstream 5V logic from catastrophic overvoltage during fault conditions. |
| EN Threshold | 1.23V typical, 75mV hysteresis - enables precise UVLO programming using resistor divider from VIN. |
Pinout & Package
RTKA211405DE0000BU is housed in a thermally enhanced TSOT23-5 package (2.9mm × 1.63mm, 0.95mm height), optimized for high-power-density DC/DC conversion in compact industrial PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output & internal bias supply | Provides 5V output; also powers internal circuitry after startup - must be decoupled with ≥22µF ceramic capacitor. |
| GND (Pin 2) | Power and signal reference ground | Low-impedance return path for switch node and control circuits; requires direct connection to power plane under IC. |
| EN (Pin 3) | Enable/disable control input | High-voltage-tolerant (up to VIN+0.3V); tie to VIN for always-on, or use resistor divider to program custom UVLO. |
| VIN (Pin 4) | Main input power supply | Accepts 7–40V; connects to source of internal MOSFET - requires low-ESR 4.7µF input capacitor placed <2mm from pin. |
| SW (Pin 5) | Switch node | Drain of internal high-side MOSFET; connects to inductor and Schottky diode - critical for EMI and thermal layout. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 4µA at 40V no-load switching enables multi-year operation from coin cells or energy-harvesting sources. |
| Pre-biased startup | Monotonic, glitch-free start-up even when VOUT is pre-charged to 3V - essential for redundant power systems. |
| Integrated protections | Full suite: VIN UVLO (6.5V trip), OVP (5.5V), OTP (160°C), and cycle-by-cycle OCP (750mA) - eliminates need for external fault management. |
| Variable frequency control | Inductor-selectable switching frequency (4.7–15µH) allows optimization for EMI, efficiency, or size without changing IC. |
| Accurate EN threshold | 1.23V ±0.1V enables reliable system-level power sequencing and custom input voltage lockout via simple resistor divider. |
| TSOT23-5 thermal design | θJA = 90°C/W on evaluation board - supports 300mA continuous output in ambient ≤85°C with minimal copper area. |
Applications
| Industrial Sensor Node Power | E-Bike Control Module Supply |
|---|---|
Use Scenario: Powering 32-bit MCU, RS-485 transceiver, and analog sensor front-end in sealed outdoor enclosure with 24V battery input. IC Role / Device Role / Timing Role: Primary 5V point-of-load regulator replacing inefficient linear regulator to extend battery life and reduce thermal load. Use Value: 4µA IQ extends 24V/5Ah battery runtime to >12 years in sleep mode; 300mA headroom supports burst telemetry transmission. | Use Scenario: Generating stable 5V rail for display controller, brake sensor interface, and Bluetooth LE module in e-bike dashboard unit. IC Role / Device Role / Timing Role: Compact, rugged DC/DC converter handling 36V nominal battery swings and load dumps up to 40V. Use Value: TSOT23-5 footprint saves >30% board area vs. comparable SOT23-6 regulators; OVP prevents damage during regenerative braking surges. |
| PLC Digital I/O Isolation Supply | Home Automation Gateway Core Rail |
Use Scenario: Providing isolated 5V supply for optocoupler drivers and level-shifters in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Secondary-side buck regulator powered from isolated 24V intermediate bus, delivering clean 5V to digital logic. Use Value: 75ns min on-time ensures stable regulation at 24V→5V conversion; pre-biased startup avoids glitches during hot-swap of I/O modules. | Use Scenario: Powering Wi-Fi SoC, Zigbee radio, and touch controller in smart home hub operating from 12V wall adapter. IC Role / Device Role / Timing Role: High-efficiency primary 5V regulator enabling fanless thermal design and low standby power certification. Use Value: 80%+ efficiency at 10mA–300mA load range reduces heat buildup in enclosed plastic housing; EN pin enables coordinated system sleep/wake. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RTKA211403DE0000BU | Identical architecture and package, but fixed 3.3V output; same 4µA IQ, 300mA rating, and protection set. | Used where 3.3V logic rail is required instead of 5V - e.g., ARM Cortex-M0+ microcontrollers or SPI peripherals. | Select RTKA211403DE0000BU only when 3.3V output is mandatory; pinout and layout are identical, enabling single-BOM flexibility. |
| TPS63036DSKR | Buck-boost topology, 1.8–5.5V adjustable output, 400mA, 3.5µA IQ; WSON-10 (3×3mm), larger than TSOT23-5. | Supports input voltages below VOUT (e.g., 2.5V–5V), unlike RTKA211405DE0000BU's buck-only 7–40V range. | Choose TPS63036DSKR only for battery-powered systems with varying input (e.g., single-cell Li-ion); not drop-in due to different pin count, package, and control scheme. |
Compared with RTKA211405DE0000BU, RTKA211403DE0000BU offers identical performance at 3.3V output with zero layout change, while TPS63036DSKR provides buck-boost flexibility at the cost of larger footprint and higher complexity - making RTKA211405DE0000BU optimal for fixed 5V industrial step-down where size and ultra-low IQ are critical.
Availability
RTKA211405DE0000BU is available at Aetrix Electronics and suitable for industrial automation, e-bike control modules, and home gateway designs requiring stable component supply, long-term manufacturability, and guaranteed traceability.
Supply support for RTKA211405DE0000BU 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 RAA2114xx family was designed specifically for ultra-low-power industrial and transportation applications demanding high input voltage tolerance, minimal quiescent current, and robust fault protection in minimal footprint.
FAQ
What is the output voltage tolerance of the RTKA211405DE0000BU over temperature and line?
The RTKA211405DE0000BU delivers a fixed 5.0V output with ±1.5% tolerance across -40°C to +125°C junction temperature and 7V–40V input range, as specified in the Electrical Specifications table (VOUT = 4.95V min / 5.1V max at VIN = 12V, no load). This tight tolerance eliminates need for post-regulation trimming in most industrial applications.
Can the RTKA211405DE0000BU operate with a 4.7µH inductor, and what is the impact on switching frequency?
Yes, the RTKA211405DE0000BU supports 4.7µH inductors per datasheet recommendation. At full 300mA load and VIN = 24V, a 4.7µH inductor raises maximum switching frequency to ~600kHz (vs. ~380kHz with 10µH), improving transient response but increasing core losses and EMI - design trade-off requiring careful layout and filtering.
How does the RTKA211405DE0000BU handle startup when the output is pre-biased to 3V?
The RTKA211405DE0000BU supports monotonic, glitch-free pre-biased startup: when enabled with VOUT = 3V, it enters high-impedance state until VOUT drops below valley threshold (~4.7V), then initiates controlled soft-start. This avoids reverse current flow and ensures safe operation in redundant power architectures without external diodes.
What is the thermal performance of the RTKA211405DE0000BU at full 300mA load in still air?
On the RTKA211405DE0000BU evaluation board, the IC operates approximately 20–25°C above ambient at full 300mA load. With θJA = 90°C/W, this means junction temperature reaches ~110°C at 85°C ambient - within the -40°C to +125°C operating range and well below 160°C thermal shutdown threshold.
Does the RTKA211405DE0000BU require an external Schottky diode, and what are the key selection criteria?
Yes, the RTKA211405DE0000BU requires an external Schottky diode connected between SW and GND. Key criteria: 1A average current rating, 60V reverse voltage (to withstand 40V input + spikes), low forward voltage (<0.5V at 300mA), and SOD323F package for compact layout - e.g., Panjit MBR1060HEWS_R1_00001 as validated in the datasheet BOM.
RTKA211405DE0000BU 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:
- 5V
- Voltage - Input:
- 300mA
- Regulator Topology:
- 7V ~ 40V
- Frequency - Switching:
- Buck
- Contents:
- -
- Utilized IC / Part:
- Board(s)
- Power - Output:
- RAA211405
RTKA211405DE0000BU FAQ
1.How can I place an order for RTKA211405DE0000BU through Aetrix?
Please submit a Request for Quotation (RFQ) for RTKA211405DE0000BU 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 RTKA211405DE0000BU reliable?
The price and inventory of RTKA211405DE0000BU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RTKA211405DE0000BU is usually 5 days.
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4.How is shipping managed for RTKA211405DE0000BU?
RTKA211405DE0000BU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RTKA211405DE0000BU 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 RTKA211405DE0000BU?
For technical support, including RTKA211405DE0000BU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RTKA211405DE0000BU requirements.
6.How does Aetrix verify that RTKA211405DE0000BU is sourced from the original manufacturer or authorized distributors?
All RTKA211405DE0000BU 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 RTKA211405DE0000BU meets industry standards.
7.What is the process for return or replacement of RTKA211405DE0000BU?
All RTKA211405DE0000BU units undergo pre-shipment inspection (PSI). If there is an issue with RTKA211405DE0000BU, 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 RTKA211405DE0000BU part is unused and in its original packaging.
Return procedure for RTKA211405DE0000BU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RTKA211405DE0000BU Tags
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DFR0571
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DFR0379
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DFR0205
DFRobot
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1385
Adafruit Industries LLC
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2465
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DC2468A
Analog Devices Inc.
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DC2841A
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TPS552892EVM-111
Texas Instruments
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TPS55289EVM-093
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EPC9158
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