tda3681a NXP Semiconductors, tda3681a Datasheet - Page 2
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tda3681a
Manufacturer Part Number
tda3681a
Description
Tda3681a Multiple Voltage Regulator With Switch And Ignition Buffer
Manufacturer
NXP Semiconductors
Datasheet
1.TDA3681A.pdf
(22 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
tda3681aTH
Manufacturer:
MITSUBISHI
Quantity:
22
Part Number:
tda3681aTH
Manufacturer:
HSOP20
Quantity:
20 000
Philips Semiconductors
FEATURES
General
Protections
ORDERING INFORMATION
2003 Aug 29
TDA3681ATH
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 V
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 V
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).
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
Multiple voltage regulator with
switch and ignition buffer
NUMBER
TYPE
P
-state controlled regulators (regulators 1, 3
HSOP20
NAME
P
, load dump and temperature
plastic, heatsink small outline package; 20 leads; low stand-off height
2
DESCRIPTION
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:
PACKAGE
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 (V
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.
Product specification
TDA3681A
VERSION
SOT418-3
P
).