TDA3681: Multiple voltage regulator with switch and ignition buffer

The TDA3681 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 TDA3681 contains the following:

TDA3681: Product Block Diagram

TDA3681: Block Diagram

sot475-1_3d

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 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 (open-collector output stage) for low VP (regulators 1, 3 and 4 and power switch off)
Hold output when one of regulators 1 and 3 and/or 4 is out of regulation
Hold output for foldback mode of power switch and regulators 1, 3 and 4
Hold output for load dump and temperature protection
Reset (push-pull output stage) for regulator 2
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 ).

Data Sheets (1)

Name/Description	Modified Date
Multiple voltage regulator with switch and ignition buffer (REV 6.0) PDF (189.0 kB) TDA3681	31 Mar 2004

Package Information (3)

Name/Description	Modified Date
plastic DIL-bent-SIL power package; 17 leads (lead length 7.7 mm) (REV 1.0) PDF (324.0 kB) SOT243-3	08 Feb 2016
plastic, heatsink small outline package; 20 leads; low stand-off height (REV 1.0) PDF (306.0 kB) SOT418-3	08 Feb 2016
plastic DIL-bent-SIL (special bent) power package; 17 leads (lead length 12 mm) (REV 1.0) PDF (341.0 kB) SOT475-1	08 Feb 2016

Ordering Information

Product	Status	Package version	Package name
TDA3681TH	Active	SOT418-3	HSOP20

Package Information

Product ID	Outline Version	Packing	Product Status	Part NumberOrdering code(12NC)	Marking	Chemical Content	LeadFree Conversion Date	MSL	MSL LF
TDA3681J/N2	SOT243-3	Bulk Pack	Withdrawn	TDA3681J/N2,112 (9352 722 45112)	Standard Marking		Always Pb-free	NA	NA
TDA3681J/N2S	SOT243-3	Bulk Pack	Active	TDA3681J/N2S,112 (9352 891 37112)	Standard Marking	TDA3681J/N2S	Always Pb-free	1	1
TDA3681JR/N2	SOT475-1	Bulk Pack	Withdrawn	TDA3681JR/N2,112 (9352 722 47112)	Standard Marking		Always Pb-free	NA	NA
TDA3681JR/N2S	SOT475-1	Bulk Pack	Active	TDA3681JR/N2S (9352 891 39112)	Standard Marking	TDA3681JR/N2S	Always Pb-free	NA	NA
TDA3681TH/N2S	SOT418-3	Reel 13" Q1/T1 in Drypack	Active	TDA3681TH/N2S,518 (9352 893 18518)	Standard Marking	TDA3681TH/N2S		3	3