tda3609jr NXP Semiconductors, tda3609jr Datasheet - Page 5

• Manufacturer Part Number: tda3609jr
• Description: Multiple Voltage Regulator With Switch And Ignition Buffers
• Manufacturer: NXP Semiconductors

Philips Semiconductors
PINNING
FUNCTIONAL DESCRIPTION
The TDA3609JR is a multiple output voltage regulator with
a power switch, intended for use in car radios with or
without a microcontroller. Because of low-voltage
operation of the car radio, low-voltage drop regulators are
used in the TDA3609JR.
Regulator 2 will switch on when the back-up voltage
exceeds 6.5 V for the first time and will switch off again
when the output voltage of regulator 2 is below 1.9 V (this
is far below an engine start). When regulator 2 is switched
on and the output voltage of this regulator is within its
voltage range, the reset output will be enabled (reset will
go HIGH via a pull-up resistor) to generate a reset to the
microcontroller. The reset cycles can be extended by a
external capacitor at pin 13. The above mentioned start-up
feature is built-in to secure a smooth start-up of the
microcontroller at first connection, without uncontrolled
switching of regulator 2 during the start-up sequence.
1997 Aug 15
V
REG1
REG3
EN3
IGN2
IGN1
IGN1
IGN2
RES
EN1
ENSW
HOLD
C
GND
REG2
BU
SW
SYMBOL
P
Multiple voltage regulator with switch and
ignition buffers
RES
IN
IN
OUT
OUT
PIN
10
11
12
13
14
15
16
17
1
2
3
4
5
6
7
8
9
supply voltage
regulator 1 output
regulator 3 output
enable input regulator 3
ignition 2 input
ignition 1 input
ignition 1 output (active LOW)
ignition 2 output
reset output
enable input regulator 1
enable input power switch
hold output
reset delay capacitor
ground
regulator 2 output
back-up
power switch output
DESCRIPTION
5
The charge of the back-up capacitor can be used to supply
regulator 2 for a short period when the supply falls down
to 0 V (time depends on value of storage capacitor).
The output stages (regulator 1 and 3) of this regulator have
extreme low noise behaviour and good stability. Using
small output capacitors regulator 1 and 3 are made stable.
When both regulator 2 and the supply voltage (V
are available, regulators 1 and 3 can be operated by
means of enable inputs (pins 10 and 4 respectively).
Regulator 1 has a hold output (open collector) indicating
that the output voltage of this regulator is settled (held
HIGH by external pull-up resistor). When the output
voltage of this regulator drops out of regulation (because
of supply voltage drop or high load) the hold output will go
LOW. The hold output signal is only valid when regulator 1
is enabled by its enable input (pin 10).
handbook, halfpage
IGN1 OUT
IGN2 OUT
IGN2 IN
IGN1 IN
ENSW
HOLD
C RES
REG1
REG3
REG2
GND
RES
EN3
EN1
Fig.2 Pin configuration.
SW
BU
V P
10
11
12
13
14
15
16
17
1
2
3
4
5
6
7
8
9
TDA3609JR
MGK606
Preliminary specification
TDA3609JR
P
> 4.5 V)