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NXP Semiconductors TDA3681JR/N2C
- Part No.:
- TDA3681JR/N2C
- Manufacturer:
- NXP Semiconductors
- Category:
- Power Management - Specialized
- Package:
- 17-SIP Formed Leads
- Datasheet:
-
TDA3681JR/N2C.pdf
- Description:
- IC VOLT REG W/SW & IGNIT 17-SIL
- Quantity:
- Payment:
- Shipping:
Inventory:4,936
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Product details
Overview
TDA3681JR/N2C from NXP Semiconductors (formerly Philips) is a 4-output automotive voltage regulator IC with integrated power switch and ignition buffer, designed for car radio systems. It delivers regulated outputs of 8.5 V/600 mA (REG1), 5.0 V/300 mA (REG2), 5.0 V/1400 mA (REG3), and 3.3 V/1 A (REG4), supports −18 V to +50 V supply range, and features load dump protection up to 50 V for 50 ms.
For engineers reviewing the TDA3681JR/N2C datasheet, TDA3681JR/N2C pinout, TDA3681JR/N2C application, or TDA3681JR/N2C equivalent, key selection considerations include its dual-supply architecture (VP1/VP2), hold/reset interface logic for microcontroller coordination, foldback current limiting across all regulators, and ignition Schmitt trigger with push-pull output - all critical for robust automotive power management design.
Technical Context
The TDA3681JR/N2C integrates four independent linear regulators with foldback current protection, a protected high-current power switch (3 A peak, 1.8 A continuous), and an ignition buffer with active-HIGH push-pull output. Regulators 1, 3, and 4 are VP-state controlled and share a combined enable (EN1/3), while REG4 and the power switch have dedicated enables (EN4, ENSW).
Its hold output (open-collector, active LOW) aggregates fault conditions including low VP1 (<7.5 V), regulator undervoltage (e.g., REG1 <7.67 V), thermal shutdown (>150 °C), and load dump (>18 V). The reset output (push-pull, active LOW) is triggered when REG2 drops below 4.4 V and includes adjustable delay via external capacitor CRES (20–70 ms typical with 47 nF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | −18 V to +50 V (reverse polarity safe to −18 V; load dump tolerant to 50 V/50 ms) |
| Regulator Outputs | REG1: 8.5 V ±0.5 V / 600 mA; REG2: 5.0 V ±0.25 V / 300 mA; REG3: 5.0 V ±0.25 V / 1400 mA; REG4: 3.3 V ±0.16 V / 1 A |
| Power Switch | Vdrop = 0.45 V @ 1 A; 1.0 V @ 1.8 A; clamped at 16 V above 17 V input; 3 A peak current capability |
| Quiescent Current | 110 µA typical in standby mode (all regulators and switch disabled, IGNIN low) |
| Thermal Protection | Junction shutdown at 150–170 °C; hold activation at same threshold; Rth(j-c) = 1.3 K/W |
| Ignition Interface | IGNIN Schmitt trigger: Vth(r) = 2.2 V, Vth(f) = 2.0 V; IGNOUT push-pull: VOH = 5.0 V, VOL = 0.2 V @ 0 mA |
Pinout & Package
Package: DBS17P - plastic DIL-bent-SIL power package, 17 leads, lead length 12 mm (SOT475-1), heat tab internally connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REG1) | Regulator 1 output | 8.5 V fixed output; foldback-protected; VP1-referenced; used for analog/digital subsystems |
| 2 (REG3) | Regulator 3 output | 5.0 V fixed output; 1400 mA capable; VP2-referenced; second supply reduces dissipation |
| 3 (VP2) | Second supply voltage input | Accepts 6.5–18 V; powers REG3/REG4 to minimize thermal stress on main supply VP1 |
| 4 (REG4) | Regulator 4 output | 3.3 V fixed output; 1 A rated; VP2-referenced; suitable for low-voltage logic or DSP cores |
| 5 (IGNIN) | Ignition input | Schmitt-triggered control signal (1.9–2.5 V rising); initiates system wake-up sequence |
| 6 (IGNOUT) | Ignition output | Active-HIGH push-pull buffer; drives external circuitry (e.g., display backlight, audio amp enable) |
| 7 (RES) | Reset output | Active-LOW push-pull; releases microcontroller after REG2 stabilizes; delay set by CRES |
| 8 (CRES) | Reset delay capacitor | External capacitor (e.g., 47 nF) sets reset release delay (20–70 ms) and power switch foldback timing |
| 9 (EN4) | Enable for REG4 | Logic-level input controlling REG4 independently; allows selective power sequencing |
| 10 (EN1/3) | Enable for REG1 and REG3 | Shared control pin; simplifies startup/shutdown coordination between primary analog and digital rails |
| 11 (ENSW) | Enable for power switch | Direct control of high-current switched output; enables load management (e.g., antenna motor, fan) |
| 12 (HOLD) | Hold output | Open-collector, active-LOW; requires external pull-up; signals any fault (undervoltage, overtemp, load dump) |
| 13 (GND) | Ground | Main reference and return path; heat tab internally tied to this pin for thermal conduction |
| 14 (BU) | Backup switch output | Provides backup power path to REG2 during VP1 dropout; supports microcontroller safe shutdown |
| 15 (REG2) | Regulator 2 output | 5.0 V microcontroller supply; operates during load dump and thermal shutdown; backup capacitor supported |
| 16 (SW) | Power switch output | High-current switched output (1.8 A continuous); foldback-protected; clamped at 16 V |
| 17 (VP1) | Primary supply voltage | Main battery input (−18 V to +50 V); powers REG1, REG2, SW, and internal logic; load dump hardened |
Key Features
| Feature | Design Value |
|---|---|
| Four independent regulators with foldback current limit | Prevents thermal runaway during short-circuit; limits power dissipation without latch-up (e.g., REG3 sustains 1400 mA then folds back) |
| Dual-supply architecture (VP1/VP2) | Enables use of DC-DC converter on VP2 to reduce total power loss - critical for high-current REG3/REG4 operation |
| Integrated hold and reset outputs | Single-point fault signaling (HOLD) and sequenced microcontroller release (RES) simplify system-level power management |
| Load dump and reverse polarity protection | Withstands 50 V/50 ms transients and −18 V reverse battery connection without external components or damage |
| Ignition Schmitt trigger with push-pull buffer | Eliminates contact bounce issues; provides clean, rail-to-rail ignition signal for reliable system wake-up and peripheral control |
Applications
| Car Radio Power Management | Microcontroller-Based Infotainment System |
|---|---|
|
Use Scenario: Central power hub in OEM car stereo head unit supplying analog front-end, digital signal processor, display controller, and audio amplifier. IC Role / Device Role / Timing Role: TDA3681JR/N2C acts as primary power manager - REG2 powers MCU core, REG1 feeds analog tuner, REG3 drives DSP, REG4 supplies display logic, SW controls antenna motor. Use Value: Single-chip integration eliminates discrete LDOs and external protection circuits, reducing BOM count and PCB area while ensuring ASIL-B–compatible fault response. |
Use Scenario: Power subsystem for aftermarket navigation system with Bluetooth, GPS, and touchscreen UI. IC Role / Device Role / Timing Role: TDA3681JR/N2C coordinates cold/warm start via IGNIN/IGNOUT, asserts HOLD during battery dip, and releases MCU via RES only after REG2 stabilizes. Use Value: Built-in reset delay (via CRES) prevents MCU brownout resets; backup switch (BU) maintains REG2 for 100+ ms during VP1 collapse - enabling graceful firmware save. |
| Automotive Audio Amplifier Supply | Telematics Control Unit (TCU) Power Stage |
|
Use Scenario: High-fidelity audio system requiring clean, isolated 8.5 V rail for preamp stages and 5 V for DAC/control logic. IC Role / Device Role / Timing Role: REG1 provides low-noise 8.5 V with <75 mV line regulation; REG3 supplies 5 V at 1400 mA for Class-D gate drivers; HOLD flags supply instability before clipping occurs. Use Value: Extremely low noise behavior with small output capacitors (220 nF + 100 µF) meets THD <0.01% requirements without ferrite beads or LC filters. |
Use Scenario: Power management for LTE/V2X telematics module operating across wide temperature and battery voltage ranges. IC Role / Device Role / Timing Role: TDA3681JR/N2C supplies 3.3 V (REG4) to modem SoC, 5 V (REG2) to MCU, and switches cellular antenna PA via SW; thermal hold triggers safe disconnect above 150 °C. Use Value: Junction temperature monitoring and hold activation at 150 °C prevent field failures in sealed enclosures; 85 °C ambient rating ensures reliability in dashboard mounting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiple-output automotive regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLF35584QVVS1 | 3-regulator + watchdog + SPI interface; no integrated power switch or ignition buffer; higher integration of safety features (ASIL-D) | Requires external switch and ignition logic; suited for safety-critical ADAS domains, not cost-sensitive infotainment | Choose TLF35584QVVS1 only if functional safety certification (ISO 26262) and diagnostic communication are mandatory. |
| MAX16922ATP+ | 3-output regulator + 2-channel high-side switch; no ignition buffer; lower max input (40 V); no load dump tolerance beyond 40 V | Lacks built-in load dump protection >40 V and reverse polarity hardening; needs external TVS for full automotive compliance | Select MAX16922ATP+ only for 12 V systems with controlled environments where 50 V load dump immunity is not required. |
Compared with TLF35584QVVS1 and MAX16922ATP+, the TDA3681JR/N2C uniquely combines four regulated outputs, a protected power switch, ignition interface, and full −18 V to +50 V ruggedness in one DBS17P package - making it optimal for cost-constrained, non-safety-critical automotive infotainment without added protection components.
Availability
TDA3681JR/N2C is available at Aetrix Electronics and suitable for car radio power management, microcontroller-based infotainment systems, and automotive audio amplifier supply requiring stable component supply, long-term automotive-grade availability, and full load dump resilience.
Supply support for TDA3681JR/N2C 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
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep heritage in automotive analog power management.
The TDA3681JR/N2C belongs to NXP's legacy automotive power management portfolio, specifically engineered for cost-effective, high-reliability car radio and infotainment systems requiring multi-rail regulation, ignition control, and transient-hardened operation.
FAQ
What is the maximum continuous current capability of the power switch in TDA3681JR/N2C?
The power switch in TDA3681JR/N2C delivers 1.8 A continuously when VP1 ≤16 V and VSW = 13.5 V. At VP1 ≥17 V, it clamps at 16 V and remains limited to 1.8 A. Peak current reaches 3 A for short durations before foldback activation, as confirmed in the Quick Reference Data and Characteristics sections of the datasheet.
How does the hold output (pin 12) behave during load dump events for TDA3681JR/N2C?
The HOLD output of TDA3681JR/N2C goes active LOW during load dump events when VP1 exceeds 18 V, as explicitly stated in the Functional Description and Limiting Values tables. This action is part of the integrated protection scheme and occurs regardless of regulator enable states, providing immediate system-level fault signaling.
Can TDA3681JR/N2C operate with only VP1 connected, or is VP2 mandatory for functionality?
VP2 is not mandatory for basic operation of TDA3681JR/N2C. REG1, REG2, and the power switch function with VP1 alone. However, VP2 is required to power REG3 and REG4 - their second supply input - and must be ≥6.5 V to enable those regulators. Omitting VP2 disables REG3 and REG4.
What is the purpose of the backup switch (BU, pin 14) in TDA3681JR/N2C, and how is it used?
The BU pin in TDA3681JR/N2C provides a dedicated backup power path to REG2 during VP1 collapse. When VP1 drops below ~4.5 V, BU supplies energy stored in an external backup capacitor (≥1 µF) to maintain REG2 output at 5 V for up to ~100 ms - allowing the microcontroller time to execute safe shutdown routines before power loss.
Does TDA3681JR/N2C support adjustable output voltages, or are all regulators fixed?
All four regulators in TDA3681JR/N2C provide fixed output voltages: REG1 = 8.5 V, REG2 = 5.0 V, REG3 = 5.0 V, and REG4 = 3.3 V. No external feedback resistors or adjustment pins are provided; the outputs are trimmed internally and specified with tight tolerances (e.g., ±0.25 V for REG2 at 300 mA load).
TDA3681JR/N2C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 17-SIP Formed Leads
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Ignition Buffer, Regulator
- Current - Supply:
- 110µA
- Voltage - Supply:
- 9.5V ~ 18V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 17-PDBS
TDA3681JR/N2C FAQ
1.How can I place an order for TDA3681JR/N2C through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA3681JR/N2C 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 TDA3681JR/N2C reliable?
The price and inventory of TDA3681JR/N2C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA3681JR/N2C is usually 5 days.
3.What payment methods are accepted for TDA3681JR/N2C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA3681JR/N2C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA3681JR/N2C?
TDA3681JR/N2C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA3681JR/N2C 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 TDA3681JR/N2C?
For technical support, including TDA3681JR/N2C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA3681JR/N2C requirements.
6.How does Aetrix verify that TDA3681JR/N2C is sourced from the original manufacturer or authorized distributors?
All TDA3681JR/N2C 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 TDA3681JR/N2C meets industry standards.
7.What is the process for return or replacement of TDA3681JR/N2C?
All TDA3681JR/N2C units undergo pre-shipment inspection (PSI). If there is an issue with TDA3681JR/N2C, 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 TDA3681JR/N2C part is unused and in its original packaging.
Return procedure for TDA3681JR/N2C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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