tda3666at NXP Semiconductors, tda3666at Datasheet - Page 8

• Manufacturer Part Number: tda3666at
• Description: Very Low Dropout Voltage/quiescent Current 10 V Voltage Regulator
• Manufacturer: NXP Semiconductors

Philips Semiconductors
E
The regulator is stabilized with an electrolytic capacitor of
68 F (ESR = 0.5 ). At T
value is decreased to 22 F and the ESR is increased
to 3.5 . The regulator will remain stable at a temperature
of T
E
The regulator is stabilized with an electrolytic capacitor of
10 F (ESR = 3.3 ). At T
value is decreased to 3 F and the ESR is increased
to 20 . The regulator will remain stable at a temperature
of T
E
The regulator is stabilized with a 100 nF MKT capacitor
connected to the output. When the output current is over
200 A full stability is guaranteed.
Because the thermal influence on the capacitor value is
almost zero, the regulator will remain stable at a
temperature of T
E
The regulator is stabilized with a 100 nF capacitor in
parallel with an electrolytic capacitor of 10 F connected to
the output.
The regulator is now stable under all conditions and
independent of:
Application circuits
The maximum output current of the regulator equals:
When T
current equals 140 mA.
The total thermal resistance of the TDA3666 can be
decreased from 125 to 50 K/W for the SO8 version. For
the SO4 version it can be decreased from 100 to 40 K/W
when GND pins 2 and 4 of the package are soldered to
the printed-circuit board.
2000 Apr 26
I
REG max
XAMPLE
XAMPLE
XAMPLE
XAMPLE
The ESR of the electrolytic capacitor
The value of the electrolytic capacitor
The output current.
Very low dropout voltage/quiescent current
10 V voltage regulator
amb
amb
= 40 C.
= 40 C.
amb
1
2
3
4
=
=
= 21 C and V
-----------------------------------------------------------
R
---------------------------------------- - mA
100
th j a
150 T
amb
–
150 T
–
= 40 C.
V
P
–
amb
–
V
10
amb
amb
P
P
amb
= 19 V the maximum output
–
V
= 40 C, the capacitor
= 40 C, the capacitor
REG
8
Application circuit with backup function
Sometimes a backup function is needed to supply, for
example, a microcontroller for a short period of time when
the supply voltage spikes to 0 V (or even 1 V).
This function can easily be built with the TDA3666 by using
an output capacitor with a large value. When the supply
voltage is 0 V (or 1 V), only a small current will flow into
pin REG from this output capacitor (a few A).
The application circuit is given in Fig.7.
handbook, halfpage
C1 is optional (to minimize supply noise only).
C2
Fig.7
4700 F.
V P
Application circuit with backup function
(SO4 version).
1 F
C1
1
TDA3666
2, 4
3
Preliminary specification
MBL132
C2
TDA3666
V REG = 10 V