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參數(shù)資料
| 型號： | LTC1551LCS8#TR-4.1 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 2/12頁 |
| 文件大?。?/td> | 271K |
| 代理商： | LTC1551LCS8#TR-4.1 |
10
LTC1550L/LTC1551L
APPLICATIONS INFORMATION
WU
U
Figure 7. Output Ripple vs Input Bypass Capacitance
INPUT CAPACITANCE (
F)
0.1
OUTPUT
RIPPLE
(mV
P-P
)
8
7
6
5
4
3
2
1
0
1
10
100
1550L/51L F08
VCC = 5V
TA = 25°C
COUT = 10F
Output Ripple vs Input Bypass Capacitor
The input bypass capacitor (CIN) can also have a fairly
significant impact on the output ripple. CIN provides most
of the LTC1550L/LTC1551L’s supply current while it is
charging the flying capacitor (C1). Inadequate input
bypassing can cause the VCC supply to dip when the
charge pump switches, causing the output linear regulator
to momentarily stop regulating. CIN should be mounted as
close to the LTC1550L/LTC1551L VCC and GND pins as
possible and its value should be significantly larger than
C1. Surface mount tantalum or ceramic capacitors with
low ESR generally provide adequate performance. Figure 7
shows the LTC1550L/LTC1551L peak-to-peak output ripple
vs CIN, taken using the test circuit in Figure 3 with ILOAD set
at 5mA. COUT is a 10F in parallel with a 0.1F ceramic
capacitor.
A 2.2
F surface mount ceramic capacitor at VCC generally
provides adequate output ripple performance for most
applications.
1
2
4.5V
≤ VCC ≤ 5.25V
8
7
REG
CPOUT
SHDN
VCC
C1+
VOUT
LTC1550L-4.1
– 4.1V BIAS
GND
C1–
COUT
10
F
1550L/51L TA02
CCP
0.1
F
GaAs
TRANSMITTER
C1
0.1
F
CIN
2.2
F
3
4
6
5
CL
0.1
F
+
– 4.1V Output GaAs FET Bias Generator
TYPICAL APPLICATION
U
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