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參數(shù)資料
| 型號(hào)： | MAX684 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 3.3V-Input to Regulated 5V-Output Charge Pumps |
| 中文描述： | 3.3V輸入、穩(wěn)壓輸出5V的電荷泵 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 154K |
| 代理商： | MAX684 |
M
In addition, the following two equations approximate
output ripple for each mode. In skip mode, output rip-
ple is dominated by ESR, and is approximately:
V
RIPPLE(SKIP)
(2V
IN
- V
OUT
)ESR
COUT
/ R
TX
where ESR
COUT
is the ESR of the output filter capaci-
tance, and R
TX
is the open-loop output transfer resist-
ance of the IC. R
TX
is typically 0.8
for the MAX682,
1.6
for the MAX683, and 3
for the MAX684. In con-
stant-frequency mode, output ripple is dominated by
C
OUT
and is approximately:
V
RIPPLE(const-freq)
I
OUT
/ (2 x f
OSC
x C
OUT
)
All capacitors must maintain a low (<100m
) equiva-
lent series resistance (ESR). Table 4 lists the manufac-
turers of recommended capacitors. Surface-mount
tantalum capacitors will work well for most applications.
Ceramic capacitors will provide the lowest ripple due to
their typically lower ESR.
If the source impedance or inductance of the input sup-
ply is large, additional input bypassing (2.2μF to 22μF)
may be needed. This additional capacitance need not
be a low-ESR type.
3.3V-Input to Regulated 5V-Output
Charge Pumps
8
_______________________________________________________________________________________
PART
C
IN
(μF)
MAX682
2.2
47
MAX683
1
22
MAX684
0.47
10
V
OUT
RIPPLE
(mV)
100
100
100
C
X
(μF)
1
0.47
0.22
OUTPUT
(mA)
250
100
50
Table 2. Recommended Capacitor Values
for Quiescent Current (Skip Mode)
Table 3. Recommended Capacitor Values
for Smallest Size (Constant-Frequency
Mode, I
SHDN
= 22μA, 1MHz)
PART
C
IN
(μF)
CERAMIC
C
OUT
(μF)
MAX682
1
2.2
MAX683
0.47
1
MAX684
0.22
0.47
V
OUT
RIPPLE
(mV)
80
80
80
C
X
(μF)
0.47
0.22
0.1
OUTPUT
(mA)
250
100
50
MANUFACTURER
PHONE
NUMBER
Sprague
(603) 224-1961
AVX
(803) 946-0690
VALUE
47μF to
10μF
47μF to
10μF
CXP
3.3V
IN
CXN
SHDN
OUT
IN
1
μ
F
1
μ
F
0.47
μ
F
0.47
μ
F
100k
100k
4.7
μ
F
SKIP
GND
PGND
MAX682
MAX682
SKIP
CXP
CXN
OUT
5V/500mA
IN
SHDN
GND
PGND
Figure 6. Paralleling Two MAX682s
TDK
(847) 390-4373
0.1μF to
2.2μF
Table 4. Recommended Capacitor
Manufacturers
C
X
C
IN
C
OUT
OUT
CXN
CXP
SHDN
IN
OUT
7
4
5
6
3
2
1
8
ON
OFF
R
EXT
SKIP
GND
PGND
MAX682
MAX683
MAX684
IN
V
ON
Figure 5. Standard Operating Circuit
TANTALUM
C
OUT
(μF)
10
4.7
2.2
CERAMIC
Ceramic
surface mount
DESCRIPTION
595D-series
tantalum
surface mount
TPS-series
surface mount
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