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TDA3681A
Datasheet
General description
The TDA3681A is a multiple output voltage regulator with a power switch and an ignition buffer. It is intended for use in car radios with or without a microcontroller. The TDA3681A contains the following:
- Four fixed voltage regulators with a foldback current protection (regulators 1, 2, 3 and 4). Regulator 2, which is intended to supply a microcontroller, also operates during load dump and thermal shutdown
- Regulators 3 and 4 have a second supply pin that can be connected to a lower supply voltage (> 6.5 V) to reduce the power dissipation
- A power switch with protection, operated by a control input
- Reset and hold outputs that can be used to interface with the microcontroller; the reset signal can be used to call up the microcontroller
- Both supply pins can withstand load dump pulses and negative supply voltages
- Regulator 2, which is in regulation at a backup voltage above 6.5 V
- A provision for the use of a reserve supply capacitor that will hold enough energy for regulator 2 (5 V continuous) to allow a microcontroller to prepare for loss of voltage
- An ignition input Schmitt trigger with push-pull output stage.
Features
General
- Extremely low noise behaviour and good stability with very small output capacitors
- Second supply pin for regulators 3 and 4 to reduce power dissipation (e.g. via a DC-to-DC converter)
- Three VP-state controlled regulators (regulators 1, 3 and 4) and a power switch
- Regulator 2, reset and ignition buffer operational during load dump and thermal shutdown
- Combined control pin for switching regulators 1 and 3
- Separate control pins for switching regulator 4 and the power switch
- Supply voltage range from -18 V to +50 V
- Low quiescent current in standby mode (when regulators 1, 3 and 4 and power switch are switched off and ignition input is low)
- Hold output for low VP, load dump and temperature protection
- Reset (push-pull output stage) for regulator 2 and hold output (open-collector output)
- Adjustable reset delay time
- High supply voltage ripple rejection
- Backup capacitor for regulator 2
- One independent ignition buffer (active HIGH).
Protections
- Reverse polarity safe (down to -18 V without high reverse current)
- Able to withstand voltages up to 18 V at the outputs (supply line may be short-circuited)
- ESD protection on all pins
- Thermal protections
- Load dump protection
- Foldback current limit protection for regulators 1, 2, 3 and 4
- Delayed second current limit protection for the power switch (at short circuit)
- The regulator outputs and the power switch are DC short-circuit safe to ground and supply (VP).
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| TDA3681ATH/N1C | TDA3681ATH/N1C | 9352 858 12512 | Volume production | SOT418-3
(HSOP20) | Tube Dry Pack | Standard Marking | TDA3681ATH/N1C
| |
| TDA3681ATH/N1C | TDA3681ATH/N1C-T | 9352 858 12518 | Volume production | SOT418-3
(HSOP20) | Reel Dry Pack, SMD, 13" | Standard Marking | TDA3681ATH/N1C
|
Products in the above table are all in production. Some variants are discontinued; click here for information on these variants.
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| TDA3681ATH/N1C | 9352 858 12512 | not available | ||||||
| TDA3681ATH/N1C | 9352 858 12518 | Order samples |
Applications
Related applications
LCD display - discretes focus
PDA - discretes focus
Motherboard components
PC supply (silverbox)
DVD / VCR SMPS
Set-top box SMPS
TV SMPS
Intelligent washing machine
Transceiver board
Power amplifier board
Main CPU board
Design support
Support Documents
Parametrics/similar products
| Type number | Package | REMARKS | Supply voltage(V) | Power dissipation(mW) | Operating temp.(Cel) | Power switch (peak/continuous)(A) | Regulator Type | Thermal protection | Short-circuit protection | Part type | Fixed or adjustable output voltage | No. of outputs | No. of regulator outputs | Multiple Output Voltages | Power Monitor | Vout1(VDC) | Vout2(VDC) | Vout3(VDC) | Vout4(VDC) | Operating voltage(VDC) | Operating Voltage Range 2(V) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TDA3681ATH/N1C | SOT418-3
(HSOP20) | Power dissipation lower if optional supply voltage 2 used. Has active LOW microprocessor reset with adjustable delay | 11~18 | 62000 | -40~85 | 3/1.8 | Voltage Regulator, Multi-output | yes | yes | Voltage Regulator, Multi-output | fixed | 4 | 3 | yes | yes | 8.5 | 5.0 | 5.0 | 3.3 | 11 to 18 | 6.5~18 |
Similar products
TDA3681A
links to the similar products page containing an overview of products that are similar in
function or related to the type number(s) as listed on this page.
The similar products page includes products from the same catalog tree(s),
relevant selection guides and products from the same functional category.
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