NXP Semiconductors TDA3683J/N2C,112

Overview

TDA3683J/N2C,112 from NXP Semiconductors (formerly Philips) is a 23-pin automotive-grade multiple-output voltage regulator IC with integrated power switch and ignition buffer, designed for car radio power management. 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), supports load dump protection up to 50 V, and operates across −40 °C to +150 °C junction temperature - enabling robust CAN bus, microcontroller, and audio subsystem supply in vehicle infotainment systems.

For engineers reviewing the TDA3683J/N2C,112 datasheet, TDA3683J/N2C,112 pinout, TDA3683J/N2C,112 application, or TDA3683J/N2C,112 equivalent, this device offers precise reset sequencing via RDC1/RDC2/3 delay capacitors, thermal pre-warning via 3-state HOLD output, and ignition signal conditioning for crank-time mute - all critical for automotive ECU and head unit design validation.

Technical Context

The TDA3683J/N2C,112 implements three independent standby regulators (REG1–REG3) with dedicated or shared enable inputs (EN1, EN2/3), each featuring internal foldback current limiting and operation during load dump/thermal shutdown. Its four switched regulators (REG4–REG7) and power switch (PSW) are mode-controlled (MODE pin) and disabled under fault conditions, while REG7 uses external resistor divider feedback for adjustable output (2.4–10 V) with built-in flyback clamp.

It integrates an inverted open-collector ignition buffer (IGNIN→IGNOUT) with low-supply latch for cold-crank reliability, dual supply inputs (VP1, VP2) rated for 50 V load dump and reverse polarity, and a storage capacitor pin (STC) providing backup for standby regulators during engine start. The HOLD output signals faults (e.g., out-of-regulation, thermal pre-warn, PSW foldback) via three-level logic (LOW/MID/HIGH) with hysteresis.

Key Specifications

Pinout & Package

Package: DBS23P - plastic DIL-bent-SIL power package with 23 leads, straight lead length 3.2 mm, low thermal resistance (R_th(j-c) = 1 K/W), and 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 MAX16922ATL+T and TPS65381AQDQ1, the TDA3683J/N2C,112 uniquely combines ignition buffering, adjustable high-current REG7, STC-backed standby regulation, and a foldback-delayed power switch - reducing total component count and board area in cost-sensitive car radio platforms.

Availability

TDA3683J/N2C,112 is available at Aetrix Electronics and suitable for automotive infotainment, CAN gateway, tuner subsystem, and instrument cluster applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant power management.

Supply support for TDA3683J/N2C,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 is a global semiconductor leader focused on automotive, industrial, and IoT applications, with deep expertise in automotive power management and functional safety.

The TDA3683J/N2C,112 belongs to NXP's legacy automotive PMIC portfolio, specifically engineered for cost-optimized car radio and head unit power architectures - emphasizing integration of standby/switched regulation, ignition conditioning, and fault diagnostics in a single DBS23P package.

FAQ

What is the maximum load dump voltage the TDA3683J/N2C,112 can withstand?

The TDA3683J/N2C,112 withstands load dump transients up to 50 V on both VP1 and VP2 pins for durations ≤50 ms with rise time ≥2.5 ms, per IEC 61000-4-5 and ISO 7637-2 compliance. This eliminates the need for external TVS diodes in most automotive battery rail designs, as confirmed in Table 1 and Table 5 of the datasheet.

How does the TDA3683J/N2C,112 ensure reliable microcontroller startup during cold cranking?

The TDA3683J/N2C,112 ensures reliable MCU startup via three mechanisms: (1) STC pin provides backup supply to REG1–REG3 during battery dips; (2) RDC1 and RDC2/3 capacitors program precise reset delays (20–70 ms) for RST1 and RST2/3; and (3) standby regulators remain active during load dump and thermal events - guaranteeing uninterrupted 5 V/3.3 V to the MCU core and CAN transceiver.

Can the TDA3683J/N2C,112 power switch (PSW) drive inductive loads like relays or motors?

Yes, the TDA3683J/N2C,112 power switch includes a built-in flyback clamp to safely dissipate energy from inductive loads such as relays, CD drive motors, or display backlight circuits. Its foldback current protection with programmable delay (via RDC1) further prevents nuisance tripping during motor inrush, as detailed in Section 7.3 and Figure 7 of the datasheet.

What is the function of the HOLD output on the TDA3683J/N2C,112, and how is it decoded?

The HOLD output on the TDA3683J/N2C,112 is a 3-state diagnostic pin signaling system status: LOW (normal), MID (thermal pre-warning >140 °C), or HIGH (fault - e.g., REG4–REG6 out-of-regulation, PSW foldback, or load dump). An external decoding circuit (per Figure 9) is required to convert these levels into standard CMOS logic signals for the host microcontroller.

Is the TDA3683J/N2C,112 compatible with 3.3 V and 5 V logic families for EN1, EN2/3, and MODE inputs?

Yes, the EN1, EN2/3, and MODE inputs of the TDA3683J/N2C,112 are fully compatible with both 3.3 V and 5 V CMOS logic families. Their rising threshold is 1.4–2.4 V and falling threshold is 0.9–1.9 V, with hysteresis of 0.5 V, ensuring noise-immune switching across automotive voltage tolerances - as specified in Table 7 under "Schmitt trigger for enable".