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TDA3662 Datasheet(PDF) 8 Page - NXP Semiconductors

No. de pieza TDA3662
Descripción Electrónicos  Very low dropout voltage/quiescent current 3.0 V voltage regulator
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Fabricante Electrónico  PHILIPS [NXP Semiconductors]
Página de inicio  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA3662 Datasheet(HTML) 8 Page - NXP Semiconductors

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2000 Apr 26
8
Philips Semiconductors
Preliminary specification
Very low dropout voltage/quiescent current
3.0 V voltage regulator
TDA3662
EXAMPLE 1
The regulator is stabilized with an electrolytic 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 with an electrolytic 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
20
Ω. The regulator will remain stable at a temperature of
Tamb = −40 °C.
EXAMPLE 3
The regulator is stabilized with a 100 nF MKT capacitor
connected to the output. When the output current is over
200
µA full stability is guaranteed.
Because the thermal influence on the capacitor value is
almost zero, the regulator will remain stable at a
temperature of Tamb = −40 °C.
EXAMPLE 4
The regulator is stabilized with a 100 nF capacitor in
parallel with an electrolytic capacitor of 10
µF connected to
the output.
The regulator is now stable under all conditions and
independent of:
• The ESR of the electrolytic capacitor
• The value of the electrolytic capacitor
• The output current.
Application circuits
The maximum output current of the regulator equals:
When Tamb =21 °C and VP = 14 V the maximum output
current equals 117 mA.
The total thermal resistance of the TDA3662 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.
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 TDA3662 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
µA).
The application circuit is given in Fig.7.
I
REG max
()
150
T
amb
R
th j
a
()
V
P
V
REG
()
×
-----------------------------------------------------------
=
150
T
amb
100
V
P
3.0
()
×
------------------------------------------ mA
()
=
andbook, halfpage
MBL136
VP
13
2, 4
C2
TDA3662
C1
1
µF
VREG = 3.0 V
Fig.7
Application circuit with backup function
(SO4 version).
C1 is optional (to minimize supply noise only).
C2
≤ 4700 µF.


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