My Inquiry
My Account
Texas Instruments TPS78418BQWDRBRQ1
- Part No.:
- TPS78418BQWDRBRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
TPS78418BQWDRBRQ1.pdf
- Description:
- AUTOMOTIVE, 300-MA, LOW-IQ, HIGH
- Quantity:
- Payment:
- Shipping:
Inventory:2,885
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TPS78418BQWDRBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LDO voltage regulator delivering 300 mA output with 1.8 V fixed output, 115 mV max dropout at 300 mA, 0.5% typical output accuracy, and 50-dB PSRR up to 100 kHz - designed for powering noise-sensitive analog circuits in head units and instrument clusters.
For engineers reviewing the TPS78418BQWDRBRQ1 datasheet, TPS78418BQWDRBRQ1 pinout, TPS78418BQWDRBRQ1 application, or TPS78418BQWDRBRQ1 equivalent, key selection criteria include ultra-low quiescent current (25 µA typ), active output discharge, functional safety documentation support, and wettable flank VSON-8 packaging for automated optical inspection in automotive PCB assembly.
Technical Context
The TPS78418BQWDRBRQ1 implements a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR across wide input range (1.65 V to 6.0 V). Its internal 500-µs soft-start limits inrush current during power-up, while foldback current limiting reduces thermal stress under overcurrent conditions.
Functional safety capability is supported via TI's safety documentation package, covering failure modes, FIT rate, and diagnostic coverage analysis. The device integrates an active pulldown circuit for rapid output discharge when disabled and features EN pin logic thresholds validated across –40°C to +125°C ambient temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±1.7% over –40°C to +150°C junction temperature |
| Max Output Current | 300 mA continuous; foldback current limit activates above ~320 mA |
| Dropout Voltage | 115 mV maximum at 300 mA load for 1.8 V output, enabling operation from 1.915 V input |
| Quiescent Current | 25 µA typical at 1 mA load; enables always-on subsystems with minimal battery drain |
| PSRR | 50 dB at 100 kHz, critical for suppressing switching noise from upstream DC/DC converters |
| Output Accuracy | ±0.5% typical at 25°C; ±1.7% max over full temperature and load range |
| Enable Threshold | VEN(HI) = 0.85 V min ensures robust noise immunity in automotive environments |
Pinout & Package
TPS78418BQWDRBRQ1 uses the 3.0 mm × 3.0 mm wettable flank VSON-8 (DRB) package with exposed thermal pad electrically tied to GND. This package supports automated optical solder-joint inspection and delivers RθJA = 61.8°C/W for enhanced thermal performance in compact automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Regulated output | Supplies stable 1.8 V to load; requires ≥0.47 µF ceramic capacitor to ground for stability |
| 2 - NC | No-connect | Not internally bonded; recommended to connect to GND plane for thermal improvement |
| 3 - NC | No-connect | Not internally bonded; recommended to connect to GND plane for thermal improvement |
| 4 - NC | No-connect | Not internally bonded; recommended to connect to GND plane for thermal improvement |
| 5 - GND | Ground reference | Primary return path; connects internally to thermal pad; must be low-impedance to system GND |
| 6 - EN | Enable control | Active-high logic input; drives device ON when ≥0.85 V; must not be left floating |
| 7 - NC | No-connect | Not internally bonded; recommended to connect to GND plane for thermal improvement |
| 8 - IN | Input supply | Accepts 1.65–6.0 V; requires ≥0.1 µF ceramic capacitor close to pin for transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation in automotive ECUs |
| Ultra-low dropout | 115 mV max at 300 mA enables use with tightly regulated intermediate rails |
| Active output discharge | Pulldown resistor (~120 Ω at 3.3 V) discharges output within microseconds after disable |
| Internal soft-start | 500-µs controlled ramp prevents input capacitor inrush and reduces required input capacitance |
| Functional safety documentation | TI provides FIT data, failure mode analysis, and diagnostic coverage reports for ISO 26262 ASIL-B systems |
Applications
| Automotive Head Units | Hybrid Instrument Clusters |
|---|---|
Use Scenario: Powering audio DACs, display timing controllers, and touch interface ICs in infotainment head units. IC Role / Device Role / Timing Role: Post-regulator providing clean 1.8 V supply isolated from noisy 3.3 V/5 V DC/DC outputs. Use Value: 50-dB PSRR at 100 kHz suppresses switching ripple from upstream buck converters, reducing audible noise and display artifacts. | Use Scenario: Supplying microcontroller I/O banks and CAN transceiver logic in digital-analog hybrid instrument panels. IC Role / Device Role / Timing Role: Low-noise bias rail for mixed-signal SoCs requiring stable 1.8 V core voltage. Use Value: ±1.7% output accuracy over –40°C to +150°C ensures reliable MCU operation without software calibration. |
| Telematics Control Units | Automotive DC/DC Post-Regulation |
Use Scenario: Delivering regulated 1.8 V to GNSS baseband processors and cellular modem RF sections. IC Role / Device Role / Timing Role: Final-stage LDO ensuring low-noise power for sensitive RF receivers and ADCs. Use Value: 30 µVRMS output noise (10 Hz–100 kHz) preserves GNSS signal SNR and positioning accuracy. | Use Scenario: Tightening voltage tolerance of 3.3 V or 5.0 V buck converter outputs for FPGA I/O banks or SerDes PHYs. IC Role / Device Role / Timing Role: Precision post-regulator correcting line/load regulation errors of primary DC/DC stages. Use Value: 0.3 mV line regulation and ±5 mV load regulation enable compliance with strict FPGA VCCIO specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS78418QWDRBRQ1 | Same silicon, identical electrical specs; differs only in tape-and-reel packaging (DRBR vs DRBRQ1 suffix denotes automotive-grade reel quantity) | No functional difference; both qualified for Grade 1 automotive use | Select TPS78418QWDRBRQ1 for standard production reels; TPS78418BQWDRBRQ1 is functionally identical with same qualification |
| TLV76718QWDRBRQ1 | Higher IQ (45 µA typ), lower PSRR (40 dB @ 100 kHz), no active discharge, SOT-23-5 package | Limited thermal performance (RθJA = 170.8°C/W); unsuitable for 300 mA continuous in sealed enclosures | Choose only if board space constraints prohibit VSON-8 and thermal budget allows higher junction rise |
Compared with TPS78418BQWDRBRQ1, TPS78418QWDRBRQ1 offers identical performance in alternate packaging, while TLV76718QWDRBRQ1 trades PSRR, thermal capability, and active discharge for smaller footprint - making the original the optimal choice for high-reliability, noise-critical automotive LDO applications.
Availability
TPS78418BQWDRBRQ1 is available at Aetrix Electronics and suitable for automotive head units, hybrid instrument clusters, and telematics control units requiring stable component supply with AEC-Q100 qualification and long-term production continuity.
Supply support for TPS78418BQWDRBRQ1 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of automotive-grade product development and manufacturing expertise.
The TPS784-Q1 family was engineered specifically for next-generation automotive infotainment and ADAS subsystems demanding ultra-low noise, high accuracy, and functional safety compliance in harsh thermal environments.
FAQ
What is the maximum input voltage rating for the TPS78418BQWDRBRQ1?
The TPS78418BQWDRBRQ1 has an absolute maximum input voltage of 6.5 V, with recommended operating input range from 1.65 V to 6.0 V. Exceeding 6.5 V risks permanent damage. Operation below 1.65 V may prevent regulation, especially at higher output currents or elevated temperatures.
Does the TPS78418BQWDRBRQ1 require an external feedback resistor network?
No, the TPS78418BQWDRBRQ1 is a fixed-output 1.8 V variant and does not require external feedback resistors. Pin 4 is a no-connect (NC) in this configuration - unlike adjustable versions which use FB (pin 4) to set output voltage via resistor dividers.
How does the active output discharge feature work in the TPS78418BQWDRBRQ1?
The TPS78418BQWDRBRQ1 integrates an internal pulldown switch that activates upon EN deactivation, presenting ~120 Ω resistance between OUT and GND. This rapidly discharges output capacitance - typically within tens of microseconds - preventing unintended wake-up or latch-up in downstream logic.
Is the TPS78418BQWDRBRQ1 compatible with lead-free reflow profiles?
Yes, the TPS78418BQWDRBRQ1's wettable flank VSON-8 package is rated for standard lead-free reflow (JEDEC J-STD-020, peak 260°C). The exposed thermal pad improves solder joint reliability and enables automated optical inspection of side-wall fillets - critical for automotive process validation.
What is the thermal shutdown behavior of the TPS78418BQWDRBRQ1?
The TPS78418BQWDRBRQ1 triggers thermal shutdown at 170°C junction temperature and resets at 155°C, providing 15°C hysteresis. During shutdown, the pass element turns off and EN remains functional - allowing recovery once temperature falls below reset threshold without requiring external cycling.
TPS78418BQWDRBRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.32V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 40 µA
- Current - Supply (Max):
- -
- PSRR:
- 60dB ~ 30dB (1kHz ~ 1MHz)
- Control Features:
- Current Limit, Enable
- Protection Features:
- Over Current, Over Temperature, UVLO
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 8-SON (3x3)
TPS78418BQWDRBRQ1 FAQ
1.How can I place an order for TPS78418BQWDRBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS78418BQWDRBRQ1 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 TPS78418BQWDRBRQ1 reliable?
The price and inventory of TPS78418BQWDRBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS78418BQWDRBRQ1 is usually 5 days.
3.What payment methods are accepted for TPS78418BQWDRBRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS78418BQWDRBRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS78418BQWDRBRQ1?
TPS78418BQWDRBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS78418BQWDRBRQ1 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 TPS78418BQWDRBRQ1?
For technical support, including TPS78418BQWDRBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS78418BQWDRBRQ1 requirements.
6.How does Aetrix verify that TPS78418BQWDRBRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS78418BQWDRBRQ1 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 TPS78418BQWDRBRQ1 meets industry standards.
7.What is the process for return or replacement of TPS78418BQWDRBRQ1?
All TPS78418BQWDRBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS78418BQWDRBRQ1, 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 TPS78418BQWDRBRQ1 part is unused and in its original packaging.
Return procedure for TPS78418BQWDRBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPS78418BQWDRBRQ1 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
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 …
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…
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…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
