NXP Semiconductors TDA3683J/N2S,112

Overview

TDA3683J/N2S,112 from NXP Semiconductors (formerly Philips Semiconductors) is a 23-pin automotive-grade multiple-output voltage regulator IC with integrated power switch and ignition buffer. It delivers seven regulated outputs (5 V/600 mA, 3.3 V/200 mA, 1.9 V/150 mA, 8.5 V/350 mA, 5 V/1.8 A, 3.3 V/1.2 A, and adjustable 2.4–10 V/2 A), a 2.2 A continuous power switch, and fault-aware hold output - all optimized for car radio power architecture.

For engineers reviewing the TDA3683J/N2S,112 datasheet, TDA3683J/N2S,112 pinout, TDA3683J/N2S,112 application in automotive infotainment, or TDA3683J/N2S,112 equivalent for multi-rail vehicle audio systems, this device provides verified load-dump immunity (50 V/50 ms), thermal pre-warning signaling, and coordinated reset sequencing for microcontrollers, DSPs, and CAN interfaces.

Technical Context

The TDA3683J/N2S,112 implements three operational modes - Sleep (5 µA quiescent), Standby (enabled standby regulators only), and On (full regulation + power switch) - controlled by EN1, EN2/3, and MODE pins with CMOS-compatible thresholds and hysteresis. Its internal architecture separates low-quiescent standby regulators (REG1–REG3) - which remain active during load dump and thermal shutdown - from high-current switched regulators (REG4–REG7) and the PSW, all of which disable under fault conditions.

Key functional blocks include independent reset delay circuits (RDC1, RDC2/3) tied to push-pull RST1/RST2/3 outputs, a storage capacitor (STC) backed-up standby supply, an open-collector inverted ignition buffer (IGNIN→IGNOUT), and a 3-state HOLD output encoding thermal pre-warn (MID), out-of-regulation (HIGH), and low-battery (HIGH) events via logic-level state transitions.

Key Specifications

Pinout & Package

Package: DBS23P - plastic DIL-bent-SIL power package with 23 leads, straight lead length 3.2 mm (SOT411-1), low thermal resistance (R_th(j-c) = 1 K/W), heat tab internally connected to GND (pin 23).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-rail automotive power management applications.

Compared with MAX16920ATL+T and TPS65381AQDAPRQ1, the TDA3683J/N2S,112 offers unique integration of ignition buffer, adjustable REG7, and STC-backed standby - making it optimal for cost-sensitive, high-reliability car radio platforms without software-defined power control.

Availability

TDA3683J/N2S,112 is available at Aetrix Electronics and suitable for automotive infotainment, body electronics, and telematics applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant power management.

Supply support for TDA3683J/N2S,112 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 develops high-performance analog and mixed-signal ICs for automotive, industrial, and IoT markets, with deep expertise in power management and vehicle networking.

The TDA3683J/N2S,112 belongs to NXP's legacy automotive power management portfolio, specifically engineered to consolidate car radio power architecture - integrating regulation, switching, ignition interface, and diagnostics into one DBS23P package.

FAQ

What is the maximum load dump voltage the TDA3683J/N2S,112 can withstand?

The TDA3683J/N2S,112 withstands 50 V load dump transients on both VP1 and VP2 pins for up to 50 ms with rise time ≥2.5 ms, per IEC 61000-4-5 and ISO 7637-2 Pulse 5a. This eliminates the need for external TVS diodes in most car radio designs, simplifying layout and improving reliability. The device remains fully functional during and after such events, with standby regulators continuing operation.

How does the TDA3683J/N2S,112 manage power sequencing between its standby and switched regulators?

The TDA3683J/N2S,112 enforces strict sequencing via enable dependencies: EN1 or EN2/3 must be asserted before MODE can activate REG4–REG7 and PSW. This ensures microcontroller and CAN bus (powered by REG1–REG3) are stable before high-current loads engage. RDC1 and RDC2/3 capacitors further refine timing - e.g., RST1 releases ~35 ms after REG1 reaches regulation, preventing premature MCU execution.

Can the TDA3683J/N2S,112's REG7 output be used for variable-voltage applications like LCD bias or sensor excitation?

Yes - REG7 is explicitly designed for adjustable output from 2.4 V to 10 V at 2 A, set by an external resistor divider on ADJ7. Its built-in flyback clamp supports inductive loads, and ±5% tolerance ensures stability across temperature and load. For LCD bias, use 5–8 V; for precision sensor excitation, pair with external filtering to meet noise requirements - confirmed in Philips' TDA3683 application note AN10321.

What happens to the TDA3683J/N2S,112's outputs during thermal shutdown?

During thermal shutdown (>150 °C), the TDA3683J/N2S,112 disables all switched regulators (REG4–REG7) and the power switch (PSW), but keeps standby regulators (REG1–REG3), ignition buffer, and reset functions fully operational. The HOLD output asserts HIGH to signal the fault. This preserves CAN bus and microcontroller functionality while shedding non-critical loads - enabling graceful system degradation rather than complete failure.

Is the TDA3683J/N2S,112 compatible with modern 3.3 V and 5 V CMOS logic levels?

Yes - all digital inputs (EN1, EN2/3, MODE, IGNIN) are CMOS-compatible with guaranteed thresholds: rising at 1.4–2.4 V and falling at 0.9–1.9 V, providing ≥0.5 V hysteresis. Outputs (RST1, RST2/3, IGNOUT, HOLD) drive standard logic levels: RST1 delivers 5 V push-pull, RST2/3 delivers 3.3 V push-pull, IGNOUT is open-collector, and HOLD is 3-state with LOW/MID/HIGH states referenced to VP1. No level-shifting is required.