參數(shù)資料
型號: TDA3661AT
廠商: NXP SEMICONDUCTORS
元件分類: 基準(zhǔn)電壓源/電流源
英文描述: Very low dropout voltage/quiescent current adjustable voltage regulator
中文描述: 1.5 V-45 V ADJUSTABLE POSITIVE LDO REGULATOR, 0.3 V DROPOUT, PDSO8
封裝: 3.90 MM, PLASTIC, SOP-8
文件頁數(shù): 5/16頁
文件大?。?/td> 88K
代理商: TDA3661AT
9397 750 15049
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 05 — 28 June 2005
5 of 16
Philips Semiconductors
TDA3661
Very low dropout voltage/quiescent current voltage regulator
11.2 Stability
The regulator is stabilized with an external capacitor connected to the output.
For stable operation:
1. The output capacitor ESR should not exceed 22
(worst case)
2. A maximum ESR may be required; see
Table 8
3. It is recommended not to use below 1 mA output current because of reduced phase
margin
4. Use electrolytic capacitors for output capacitor values of 1
μ
F and above.
11.3 Application circuits
The maximum output current of the regulator equals:
150
T
th j
a
(
)
V
P
When T
amb
= 21
°
C, V
P
= 14 V and V
REG
= 5 V (k = 4.01929) the maximum output current
equals 140 mA.
For successful operation of the IC (maximum output current capability) special attention
has to be given to the copper area required as heatsink (connected to all GND pins), the
thermal capacity of the heatsink and its ability to transfer heat to the external environment.
It is possible to reduce the total thermal resistance from 155 K/W to 50 K/W.
11.3.1
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 TDA3661 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
μ
A).
The application circuit is given in
Figure 3
.
Table 8:
I
REG
(mA)
1
5
10
100
Minimum ESR values required
C2 = 100 nF
>
0
>
0
>
0
>
0
C2 = 1
μ
F
>
1.5
>
0
>
0
>
0
C2 = 10
μ
F
>
0
>
0
>
0
>
0
C2 = 100
μ
F
>
0
>
0
>
0
>
0
I
REG max
)
V
REG
)
----------------------------------------------------------
150
T
P
)
-----------------------------------
mA
(
)
=
=
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