NXP Semiconductors TDA3606AT/N1,112

Overview

TDA3606AT/N1,112 from NXP Semiconductors (formerly Philips) is a multiple voltage regulator IC with integrated battery detection and dual reset outputs, designed for automotive microprocessor power management. It delivers a stable 5.0 V ±2% output at up to 150 mA, operates across −18 V to +50 V supply range, features load dump protection, and enables controlled microprocessor startup in car radio systems.

For engineers reviewing the TDA3606AT/N1,112 datasheet, TDA3606AT/N1,112 pinout, TDA3606AT/N1,112 application, or TDA3606AT/N1,112 equivalent, key selection criteria include its 7.6 V turn-on threshold, 2.4 V regulator shutdown point, dual Schmitt-triggered reset outputs with programmable delay, reverse polarity safety down to −18 V, and SO20 package thermal performance under automotive ambient conditions (−40 °C to +85 °C).

Technical Context

The TDA3606AT/N1,112 integrates a foldback-current-limited 5 V linear regulator, two independent reset outputs (RES1 with internal 4.7 kΩ pull-up, RES2 gated by RES1), and a battery detection circuit with 2.05 V rising threshold and 0.1 V hysteresis. Its start-up behavior is defined by a VP-dependent Schmitt trigger (7.5 V typ. turn-on, 2.4 V turn-off), ensuring deterministic microprocessor initialization without uncontrolled switching during ignition transients.

Load dump protection supports 50 V pulses for ≤50 ms (tr ≥2.5 ms), while reverse battery tolerance extends to −18 V without high reverse current. All outputs are ESD-protected, and the regulator remains functional during load dump events-maintaining 5.0 V output even at VP = 50 V and IREG = 30 mA.

Key Specifications

Pinout & Package

Package: SO20 (SOT163-1), plastic small outline, 20-lead, 7.5 mm body width, thermal resistance R_th(j-p) = 20 K/W - optimized for PCB copper heat spreading via pins 1–3, 8–13, and 18–20 (all n.c. but serve as thermal pads).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multiple-output automotive regulator applications.

Compared with TL7705ACDR and MAX6326US31D3+, the TDA3606AT/N1,112 uniquely integrates regulation, dual reset sequencing, battery sensing, and automotive-grade transient protection in one SO20 package-reducing system-level component count and simplifying compliance with ISO 7637-2 and ISO 16750-2.

Availability

TDA3606AT/N1,112 is available at Aetrix Electronics and suitable for automotive infotainment, telematics control units, car radio subsystems, and aftermarket navigation systems requiring stable component supply across extended temperature and harsh electrical environments.

Supply support for TDA3606AT/N1,112 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 power management and automotive electronics.

The TDA3606AT/N1,112 belongs to NXP's legacy automotive analog power IC portfolio, specifically engineered for robust microprocessor power sequencing and battery monitoring in 12 V vehicle electrical systems.

FAQ

What is the minimum supply voltage required for the TDA3606AT/N1,112 to activate its regulator?

The TDA3606AT/N1,112 regulator activates when the VP supply voltage exceeds 7.6 V (typical), with a guaranteed turn-on threshold between 6.2 V and 8.2 V. Below this, the regulator remains off and both RES1 and RES2 outputs stay LOW. This hysteresis prevents oscillation during slow battery recovery after cranking. The TDA3606AT/N1,112 will not regulate until VP crosses this defined threshold, ensuring clean MCU startup.

How does the TDA3606AT/N1,112 handle load dump events per ISO 7637-2?

The TDA3606AT/N1,112 withstands 50 V load dump pulses for up to 50 ms (with rise time ≥2.5 ms) without external protection components. During such events, it continues delivering 5.0 V to the load at up to 100 mA, maintaining system operation. Its internal protection includes foldback current limiting and robust junction design-verified per Philips' 1998 product specification. The TDA3606AT/N1,112 is explicitly rated for this stress condition, eliminating need for external TVS diodes in compliant designs.

Can the reset delay time of the TDA3606AT/N1,112 be adjusted, and what capacitor value achieves ~100 ms?

Yes, the reset delay is set by an external capacitor on pin VC (6). With Cd = 47 nF, the delay ranges from 40 to 125 ms (typ. ~100 ms). The formula td ≈ (Cd × Vthr) / Ich applies, where Vthr = 2.0 V and Ich = 0.75 µA. For precise 100 ms timing, a 47 nF X7R ceramic capacitor is recommended. The TDA3606AT/N1,112 datasheet confirms this value yields nominal 100 ms delay under standard conditions.

What is the function of the VO(bat) output on the TDA3606AT/N1,112, and how is it used?

The VO(bat) output (pin 5) is an open-drain buffer reflecting the status of the VI(bat) input (pin 4). It goes HIGH when battery voltage exceeds 2.05 V (rising threshold) and LOW when it falls below 1.95 V (falling threshold), providing 0.1 V hysteresis. This signal can drive an LED indicator or microcontroller GPIO to monitor battery health independently of the main regulator. In the TDA3606AT/N1,112, VO(bat) enables early low-battery warning before regulator dropout occurs.

Is the TDA3606AT/N1,112 compatible with modern automotive PCB assembly processes?

Yes, the TDA3606AT/N1,112 in SO20 (SOT163-1) package supports both reflow and wave soldering per Philips' 1998 guidelines. Reflow peak temperature is 250 °C max (dwell ≤300 s); wave soldering allows 260 °C for ≤10 s immersion. Its thermal pad structure (n.c. pins 1–3, 8–13, 18–20) requires connection to large copper areas for heat dissipation. The TDA3606AT/N1,112 remains compatible with industry-standard SMT lines and meets JEDEC MS-013AC footprint specifications.