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PDF TDA3605Q Data sheet ( Hoja de datos )
| Número de pieza | TDA3605Q | |
| Descripción | Multiple voltage regulator with switch | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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INTEGRATED CIRCUITS
DATA SHEET
TDA3605Q
Multiple voltage regulator with
switch
Preliminary specification
Supersedes data of 1995 Nov 20
File under Integrated Circuits, IC01
1997 Jul 09
1 page  
Philips Semiconductors
Multiple voltage regulator with switch
Preliminary specification
TDA3605Q
PINNING
SYMBOL PIN
DESCRIPTION
VP
REG1
1 supply voltage
2 regulator 1 output
REG3
3 regulator 3 output
Ven3
RES
4 enable input regulator 3
5 reset output voltage
Ven1
Ven(sw)
Vhold
VC
GND
6 enable input regulator 1
7 enable input power switch
8 hold output
9 reset delay capacitor
10 ground (0 V)
REG2
11 regulator 2 output
Vbu 12 back-up
Vsw 13 power switch output voltage
handbook, halfpage
VP 1
REG1 2
REG3 3
Ven3 4
RES 5
Ven1 6
Ven(sw) 7 TDA3605Q
Vhold 8
VC 9
GND 10
REG2 11
Vbu 12
Vsw 13
MGB752
Fig.2 Pin configuration.
FUNCTIONAL DESCRIPTION
The TDA3605Q 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 TDA3605Q.
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 an external capacitor at pin 9. 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.
The charge of the back-up capacitor can be used to supply
regulator 2 for a short period when the supply falls to 0 V
(time depends on value of storage capacitor). When both
regulator 2 and the supply voltage (VP > 4.5 V) are
available, regulators 1 and 3 can be operated by means of
enable inputs (pins 6 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) and 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 6).
The power switch can also be controlled by means of a
separate enable input (pin 7).
All output pins are fully protected. The regulators are
protected against load dump (regulator 1 and 3 will switch
off at supply voltages >18 V) and short-circuit (foldback
current protection).
The switch contains a current protection, but this
protection is delayed at short-circuit condition for at least
10 ms. During this time the output current is limited to a
peak value of at least 3 A and 2 A (DC) (VP ≤ 18 V).
At supply voltages >17 V the switch is clamped at
maximum 16 V (to avoid external connected circuitry being
damaged by an overvoltage) and the switch will switch-off
at load dump.
The total timing of a semi on/off logic set is shown in Fig.3.
1997 Jul 09
5
5 Page 
Philips Semiconductors
Multiple voltage regulator with switch
Preliminary specification
TDA3605Q
handbook, halfpage
9V
VREG1
MGB755
handbook, halfpage
VREG2
5.0 V
MGB756
2V
1V
IREGsc1
a. Regulator 1.
≥300 mA IREGm1
IREG1
IREGsc2 ≥50 mA
IREG2
b. Regulator 2.
IREGm2
handbook, halfpage
VREG3
5.0 V
MGB757
1V
IREGsc3
≥200 mA
IREG3
c. Regulator 3.
IREGm3
Fig.4 Foldback current protection of the regulators.
handbook, halfpage
≥3
Isw
(A)
1.8
≥10
MGB758
t (ms)
VSW ≥ 5 V.
1997 Jul 09
Fig.5 Current protection of the power switch.
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet TDA3605Q.PDF ] | |
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