參數(shù)資料
型號(hào)： 935262697112
廠商： NXP SEMICONDUCTORS
元件分類： 固定正電壓?jiǎn)温份敵鯨DO穩(wěn)壓器
英文描述： 5 V FIXED POSITIVE LDO REGULATOR, 0.3 V DROPOUT, PDSO8
封裝： PLASTIC, SOT-96, SO-8
文件頁(yè)數(shù)： 22/23頁(yè)
文件大小： 137K
代理商： 935262697112
2000 Feb 18
8
Philips Semiconductors
Preliminary specication
Very low dropout voltage/quiescent current
5 V voltage regulator
TDA3664
EXAMPLE 1
The regulator is stabilized with an electrolytic output
capacitor of 68
F (ESR = 0.5 ). At 40 °C, the capacitor
value is decreased to 22
F and the ESR is increased to
3.5
. The regulator will remain stable at a temperature of
40 °C.
EXAMPLE 2
The regulator is stabilized with an electrolytic output
capacitor of 10
F (ESR = 3.3 ). At 40 °C, the capacitor
value is decreased to 3
F and the ESR is increased to
20
. The regulator will remain stable at a temperature of
40 °C.
EXAMPLE 3
The regulator is stabilized with a 100 nF MKT capacitor on
the output. Full stability is guaranteed when the output
current is over 200
A.
Because the thermal influence on this capacitor value is
almost zero, the regulator will remain stable at a
temperature of
40 °C.
EXAMPLE 4
The regulator is stabilized with a 100 nF capacitor in
parallel with a electrolytic capacitor of 10
F on 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, the maximum output current equals
140 mA at VP =14 V.
The total thermal resistance of the TDA3664 (SOT223-1
package) can be decreased to lower values when pin 4
and body 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 be easily built with the TDA3664 by using
a large output capacitor. When the supply voltage is 0 V
(or
1 V), only a small current will flow into pin REG from
this large output capacitor (a few
A).
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
5
–
()
×
-------------------------------------
=
(mA)
handbook, halfpage
MDA960
VP
13
2, 4
REG(3)
C1(1)
1
F
C2(2)
TDA3664
Fig.7
Application circuit with backup function
(SO4 version).
(1) C1 is optional (to minimize supply noise only).
(2) C2
≤ 4700 F.
(3) VREG =5V.
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