Overview
The TDA3681JR/N2C is a multiple output voltage regulator integrated circuit produced by NXP Semiconductors. It is designed for use in car radios, both with and without a microcontroller. This IC combines several key functions, including multiple fixed voltage regulators, a power switch, and an ignition buffer, making it a versatile component for automotive electronics.
Key Specifications
| Parameter | Conditions | Value | Unit |
|---|---|---|---|
| Supply Voltage Range | Operating | -18 to +50 | V |
| Load Dump Protection | t ≤ 50 ms; tr ≥ 2.5 ms | -50 | V |
| Total Power Dissipation | -62 | W | |
| Ambient Temperature Range | Operating | -40 to +85 | °C |
| Junction Temperature Range | Operating | -40 to +150 | °C |
| Quiescent Current (IREG1 = 600 mA) | 25 to 60 | mA | |
| Output Voltage (Regulator 2) | 0.5 mA ≤ IREG2 ≤ 300 mA | 4.75 to 5.25 | V |
| Output Voltage (Regulator 4) | 1 mA ≤ IREG4 ≤ 1 A | 3.14 to 3.46 | V |
| Drop-out Voltage (Regulator 1) | IREG1 = 550 mA; VP1 = 8.55 V | 0.4 to 0.7 | V |
| Drop-out Voltage (Regulator 4) | IREG4 = 1 A; VP2 = 5 V | 1.7 to 2.4 | V |
Key Features
- Extremely low noise behavior and good stability with very small output capacitors.
- Four fixed voltage regulators with foldback current protection.
- Regulator 2 operates during load dump and thermal shutdown.
- Second supply pin for regulators 3 and 4 to reduce power dissipation.
- A power switch with protection, operated by a control input.
- Reset and hold outputs for interfacing with a microcontroller.
- Provision for a reserve supply capacitor to maintain voltage during power loss.
Applications
The TDA3681JR/N2C is primarily used in automotive electronics, particularly in car radios with or without a microcontroller. It is suitable for systems that require multiple regulated voltages, robust protection against load dump and thermal shutdown, and low quiescent current in standby mode.
Q & A
- What is the primary function of the TDA3681JR/N2C? The TDA3681JR/N2C is a multiple output voltage regulator with a power switch and an ignition buffer, designed for use in car radios.
- What is the supply voltage range of the TDA3681JR/N2C? The supply voltage range is from -18 V to +50 V.
- How many fixed voltage regulators does the TDA3681JR/N2C have? It has four fixed voltage regulators.
- What is the purpose of the second supply pin for regulators 3 and 4? The second supply pin is used to reduce power dissipation by connecting to a lower supply voltage (>6.5 V).
- Does the TDA3681JR/N2C have protection against load dump? Yes, it has load dump protection up to -50 V for t ≤ 50 ms; tr ≥ 2.5 ms.
- What is the quiescent current in standby mode? The quiescent current is 25 to 60 mA when regulators 1, 3, and 4 and the power switch are switched off and the ignition input is low.
- Can the TDA3681JR/N2C operate during thermal shutdown? Yes, regulator 2 operates during thermal shutdown.
- What is the thermal resistance from junction to ambient in free air? The thermal resistance from junction to ambient in free air is 50 K/W.
- What are the typical output voltages for regulators 2 and 4? Regulator 2 typically outputs 4.75 to 5.25 V, and regulator 4 typically outputs 3.14 to 3.46 V.
- Is the TDA3681JR/N2C RoHS compliant? Yes, the TDA3681JR/N2C is RoHS compliant.
