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PDF TDA3616T Data sheet ( Hoja de datos )
| Número de pieza | TDA3616T | |
| Descripción | Multiple voltage regulator with battery detection | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
TDA3616
Multiple voltage regulator with
battery detection
Objective specification
Supersedes data of 1998 Jul 22
File under Integrated Circuits, IC01
2000 Jan 14
1 page  
Philips Semiconductors
Multiple voltage regulator with battery
detection
Objective specification
TDA3616
FUNCTIONAL DESCRIPTION
The TDA3616 (see Fig.1) is a voltage regulator intended
to supply a microprocessor (e.g. in car radio applications).
Because of low-voltage operation of the application, a
low-voltage drop regulator is used.
This regulator will switch-on when the backup voltage
(see Section “Backup circuit”) exceeds 7.5 V for the first
time and will switch-off again when the output voltage of
the regulator drops below 2.4 V. When the regulator is
switched on, the RES1 and RES2 outputs (RES2 can only
be HIGH when RES1 is HIGH) will go HIGH after a fixed
delay time (fixed by an external delay capacitor) to
generate a reset to the microprocessor.
Pin RES1 will go HIGH via an internal pull-up resistor of
3.1 kΩ, and is used to initialize the microprocessor.
Pin RES2 is used to indicate that the regulator output
voltage is within its voltage range. This start-up feature is
built-in to secure a smooth start-up of the microprocessor
at first connection, without uncontrolled switching of the
regulator during the start-up sequence.
The charge of the backup capacitor can be used to supply
the regulator and logic circuits for a short period of time
when the supply falls to 0 V (the time depends on the value
of the storage capacitor). The regulator is switched off at a
backup voltage of approximately 2.7 V. From this time
onwards, the backup charge will only be used for
maintaining reset functions. Due to this, the reset outputs
will remain LOW until the output of the regulator is dropped
to 0 V.
All output pins are fully protected. The regulator is
protected against load dump and short-circuit (foldback
current protection). At load dump, the battery detection
circuit will remain operating.
Interfacing with the microprocessor can be accomplished
by means of a battery Schmitt trigger and output buffer
(simple full/semi on/off logic applications). The battery
output will go HIGH when the battery input voltage
exceeds the high threshold level.
The timing diagrams are shown in Fig.4.
handbook, full pagewidth
VP
VBU
regulator
4.75 V
2.4 V
reset 2
reset 1
reset delay
capacitor
battery input
2V
battery output
2000 Jan 14
18 V
2V
Fig.4 Timing diagrams.
5
2.05 V
1.95 V
MGR095
5 Page 
Philips Semiconductors
Multiple voltage regulator with battery
detection
Objective specification
TDA3616
Application information
NOISE
The noise at the output of the regulator depends on the
bandwidth of the regulator, which can be adjusted by the
output capacitor CL. Table 1 shows the noise figures.
The noise on the supply line depends on the value of the
supply capacitor CP and is caused by a current noise (the
output noise of the regulator is translated into a current
noise by the output capacitor). When a high frequency
capacitor of 220 nF (with an electrolytic capacitor of
100 µF connected in parallel) is connected directly
between pins VP and GND the noise is minimized.
Table 1 Noise figures
IO (mA)
0.5
50
NOISE FIGURE (µV)(1)
CL = 10 µF
58
250
CL = 47 µF
50
200
CL = 100 µF
45
180
Note
1. Measured at a bandwidth of 10 Hz to 100 kHz.
STABILITY
The regulator is stabilized by the output capacitor CL.
The value of the output capacitor can be selected using
the diagram shown in Fig.8. The following two examples
show the effects of the stabilization circuit using different
values for the output capacitor.
Remark: The behaviour of ESR as a function of the
temperature must be known.
Example 1
The regulator is stabilized using an electrolytic output
capacitor of 68 µF (ESR = 0.5 Ω). At Tamb = −40 °C the
capacitor value is decreased to 22 µF and the ESR is
increased to 3.5 Ω. The regulator will remain stable at a
temperature of Tamb = −40 °C.
Example 2
The regulator is stabilized using an electrolytic output
capacitor of 10 µF (ESR = 3.3 Ω). At Tamb = −40 °C the
capacitor value is decreased to 3 µF and the ESR is
increased to 23.1 Ω. The regulator will be unstable at a
temperature of Tamb = −40 °C. This can be solved by using
a tantalum capacitor of 10 µF.
handbook, full pagewidth
8
ESR
(Ω) 6
4
2
0
0.68 1
MBK118
(1)
stable region
(2)
10
100
output capacitor (µF)
1000
(1) Maximum Equivalent Series Resistance (ESR).
(2) Minimum ESR.
Fig.8 Curve for selecting the value of the output capacitor.
2000 Jan 14
11
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