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Texas Instruments TPS3840PL29DBVRQ1
- Part No.:
- TPS3840PL29DBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840PL29DBVRQ1.pdf
- Description:
- AUTOMOTIVE HIGH-INPUT VOLTAGE SU
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS3840PL29DBVRQ1 from Texas Instruments is an automotive-grade nano-IQ voltage supervisor with push-pull active-low RESET output, 2.9 V fixed threshold (±1.5% max), 350 nA typical quiescent current, and programmable capacitor-based reset delay up to 6.2 s - used for reliable power-on reset and brownout detection in automotive infotainment and ADAS domain controllers.
For engineers reviewing the TPS3840PL29DBVRQ1 datasheet, TPS3840PL29DBVRQ1 pinout, TPS3840PL29DBVRQ1 application, or TPS3840PL29DBVRQ1 equivalent, key selection considerations include its AEC-Q100 Grade 1 qualification (–40°C to +125°C), 100 mV typical hysteresis at 2.9 V threshold, fast 350 µs max startup delay, and SOT-23-5 (DBV) package compatibility with space-constrained automotive PCB layouts.
Technical Context
The TPS3840PL29DBVRQ1 implements a precision bandgap-referenced comparator with built-in hysteresis and glitch-immune VDD monitoring logic. Its internal state machine asserts RESET when VDD drops below 2.9 V (VIT−) or MR is pulled low, and deasserts RESET only after VDD rises above VIT+ (2.9 V + 100 mV), MR is released, and the programmed tD delay expires.
Reset timing is controlled via external capacitor on CT pin, with RCT ≈ 500 kΩ internal resistance enabling predictable tD scaling from 50 µs (open) to 6.2 s (10 µF). The push-pull output drives RESET directly without external pull-up, supporting sink currents up to 2 mA at VOL ≤ 200 mV (VDD = 1.5–5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 2.9 V ±1.5% max over –40°C to +125°C - ensures accurate brownout detection for 3.3 V or 2.8 V rails |
| Quiescent Current | 350 nA typ, 700 nA max - enables always-on monitoring in battery-backed automotive modules |
| Hysteresis (VHYS) | 100 mV typ (VIT− ≤ 3.0 V) - prevents oscillation during slow-rising/falling supply transitions |
| Startup Delay (tSTRT) | 350 µs max - guarantees fast system initialization after power ramp-up |
| Reset Delay Range (tD) | 50 µs (CT open) to 6.2 s (CT = 10 µF) - supports flexible timeout tuning for MCU boot sequences |
| Output Type | Push-pull active-low - eliminates need for external pull-up resistor, reduces BOM count |
| ESD Rating | HBM ±2000 V, CDM ±750 V - meets automotive manufacturing ESD robustness requirements |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm max height, gull-wing leads, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low push-pull output | Drives low during reset assertion; high-impedance release requires no external pull-up |
| 2: VDD | Supply and monitored input | Monitors own supply rail; operates from 1.5 V to 10 V; bypass capacitor required |
| 3: GND | Reference ground | Return path for internal regulator, comparator, and output stage; must be low-impedance |
| 4: MR | Active-low manual reset input | Pull low to force reset; internal 100 kΩ pull-up allows floating when unused |
| 5: CT | Capacitor time-delay programming | Connect external capacitor to GND to set tD; floating = minimum 50 µs delay |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 | Qualified for –40°C to +125°C ambient operation - suitable for under-hood and cockpit electronics |
| Nano-IQ Operation | 350 nA typical supply current - extends battery life in always-on vehicle systems |
| Programmable tD | 50 µs to 6.2 s via single external capacitor - replaces discrete RC networks and timers |
| Glitch Immunity | 10 µs rejection window for 5% VIT− overdrive - suppresses noise-induced false resets |
| VPOR Function | 300 mV power-on reset threshold - ensures valid output state during ultra-slow VDD ramp-up |
Applications
| Automotive Head Unit Power Sequencing | ADAS Domain Controller Brownout Protection |
|---|---|
Use Scenario: Monitors 3.3 V VCORE and 1.8 V VI/O rails in infotainment head units during cold crank and load dump events. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to SoC until both rails stabilize above 2.9 V and tD expires. Use Value: Prevents firmware corruption by ensuring CPU reset persists through transient dips below 2.9 V, leveraging 100 mV hysteresis and 350 nA IQ. |
Use Scenario: Guards multi-rail power domains in radar/ADAS ECUs where 5 V, 3.3 V, and 1.2 V supplies must sequence correctly. IC Role / Device Role / Timing Role: Dedicated 2.9 V monitor on critical 3.3 V rail; MR pin tied to safety microcontroller for coordinated system-level reset. Use Value: Enables deterministic reset coordination across subsystems using programmable tD to align with slowest power rail stabilization. |
| Telematics Control Unit (TCU) Always-On Monitoring | Automotive Display Backlight Driver Supervision |
Use Scenario: Maintains supervision during vehicle sleep mode, detecting battery voltage sag below 2.9 V to wake host MCU. IC Role / Device Role / Timing Role: Ultra-low-IQ supervisor on 3.3 V always-on rail; CT pin open for 50 µs tD to minimize wake latency. Use Value: Achieves <1 µA total system sleep current while retaining reliable wake-on-fault capability. |
Use Scenario: Ensures backlight driver IC receives clean enable signal only after 3.3 V rail reaches 2.9 V with stable regulation. IC Role / Device Role / Timing Role: RESET output drives enable pin of LED driver; tD set to 100 ms via 100 nF CT capacitor to filter startup ripple. Use Value: Eliminates visible flash or flicker during display power-up by delaying driver activation until rail settles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840DL29DBVRQ1 | Open-drain active-low output; requires external pull-up resistor; identical VIT−, IQ, tD, and AEC-Q100 specs | Suitable where bus-wired RESET lines or level-shifting is needed; higher board area due to pull-up component | Select when shared RESET bus or interface voltage translation is required; avoid if minimizing BOM count is priority |
| MAX6375XR29+T | 2.9 V threshold, 1.6 µA IQ, fixed 200 ms tD, SOT-23-5, AEC-Q100 Grade 2 (–40°C to +105°C) | Limited temperature range and higher quiescent current reduce suitability for high-ambient ADAS use cases | Consider only for cost-sensitive non-critical modules where 125°C operation and nano-IQ are not required |
Compared with TPS3840DL29DBVRQ1, the TPS3840PL29DBVRQ1 eliminates external pull-up components and simplifies layout; compared with MAX6375XR29+T, it delivers 4.6× lower quiescent current and full Grade 1 thermal compliance - critical for extended automotive reliability.
Availability
TPS3840PL29DBVRQ1 is available at Aetrix Electronics and suitable for automotive head unit, ADAS domain controller, and telematics control unit applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for TPS3840PL29DBVRQ1 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 company designing analog, embedded processing, and connectivity technologies for automotive, industrial, and personal electronics markets.
The TPS3840-Q1 product line delivers ultra-low-power, high-accuracy voltage supervision specifically for automotive electronics demanding AEC-Q100 qualification, wide input voltage range, and programmable timing - targeting infotainment, ADAS, and body control modules.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840PL29DBVRQ1?
The TPS3840PL29DBVRQ1 has a factory-trimmed negative-going input threshold (VIT−) of 2.9 V with ±1.5% maximum accuracy over –40°C to +125°C ambient temperature. Typical accuracy is ±1%, and hysteresis is 100 mV (typical), resulting in VIT+ = 3.0 V. This ensures precise brownout detection for 3.3 V systems without calibration.
How does the CT pin function in the TPS3840PL29DBVRQ1?
The CT pin on the TPS3840PL29DBVRQ1 sets the reset time delay (tD) via an external capacitor to GND. With no capacitor, tD = 50 µs; with 10 µF, tD ≈ 6.2 s. Internal RCT ≈ 500 kΩ defines the RC time constant. Leaving CT floating selects minimum delay; connecting capacitor adds programmable hold time after VDD recovery before RESET deassertion.
Is the TPS3840PL29DBVRQ1 pin-compatible with other TPS3840-Q1 variants?
Yes - all TPS3840-Q1 devices in DBV (SOT-23-5) package share identical pinout: Pin 1 = RESET, Pin 2 = VDD, Pin 3 = GND, Pin 4 = MR, Pin 5 = CT. The TPS3840PL29DBVRQ1 is pin-compatible with TPS3840DL29DBVRQ1 and TPS3840PH29DBVRQ1; only output topology (push-pull vs open-drain vs active-high) differs.
What is the maximum supply voltage and operating temperature range for the TPS3840PL29DBVRQ1?
The TPS3840PL29DBVRQ1 supports VDD from 1.5 V to 10 V and is qualified per AEC-Q100 Grade 1 for ambient operating temperatures from –40°C to +125°C. Absolute maximum VDD is 12 V. Junction temperature must not exceed +150°C, and thermal resistance RθJA is 187.5°C/W in standard JEDEC PCB layout.
Does the TPS3840PL29DBVRQ1 require an external pull-up resistor on the RESET pin?
No - the TPS3840PL29DBVRQ1 features a push-pull active-low output, so RESET is actively driven high or low without external components. Unlike open-drain variants (e.g., TPS3840DL29DBVRQ1), it eliminates the need for a pull-up resistor, reducing BOM count, board space, and potential noise coupling from resistor parasitics.
TPS3840PL29DBVRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.9V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 619ms Typical
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TPS3840PL29DBVRQ1 FAQ
1.How can I place an order for TPS3840PL29DBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840PL29DBVRQ1 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 TPS3840PL29DBVRQ1 reliable?
The price and inventory of TPS3840PL29DBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840PL29DBVRQ1 is usually 5 days.
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TPS3840PL29DBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3840PL29DBVRQ1 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 TPS3840PL29DBVRQ1?
For technical support, including TPS3840PL29DBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840PL29DBVRQ1 requirements.
6.How does Aetrix verify that TPS3840PL29DBVRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3840PL29DBVRQ1 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 TPS3840PL29DBVRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3840PL29DBVRQ1?
All TPS3840PL29DBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840PL29DBVRQ1, 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 TPS3840PL29DBVRQ1 part is unused and in its original packaging.
Return procedure for TPS3840PL29DBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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