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参数资料
| 型号： | MAX684EUA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHED CAP 5V 8UMAX |
| 标准包装： | 2,500 |
| 类型： | 切换式电容器（充电泵） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 2.7 V ~ 5.5 V |
| 频率 - 开关： | 200kHz，1MHz |
| 电流 - 输出： | 50mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-uMAX |
3.3V-Input to Regulated 5V-Output
Charge Pumps
Table 2. Recommended Capacitor Values
OUTPUT C IN
C X
(μF) (μF) TANTALUM CERAMIC
for Quiescent Current (Skip Mode)
C OUT (μF)
PART
(mA)
V OUT
RIPPLE
(mV)
OFF
ON V ON R EXT
IN
2
3
1
SHDN
IN
SKIP
MAX682
MAX683
MAX684
CXP
CXN
OUT
7
6
8
C X
OUT
MAX682
250
2.2
1
47
10
100
C IN
GND
4
PGND
5
C OUT
MAX683
100
1
0.47
22
4.7
100
MAX684
50
0.47 0.22
10
2.2
100
Figure 5. Standard Operating Circuit
5V/500mA
Table 3. Recommended Capacitor Values
for Smallest Size (Constant-Frequency
3.3V IN
Mode, I S H D N = 22μA, 1MHz)
IN
OUT
IN
OUT
PART
MAX682
MAX683
OUTPUT
(mA)
250
100
C IN
(μF)
1
0.47
C X
(μF)
0.47
0.22
CERAMIC
C OUT
(μF)
2.2
1
V OUT
RIPPLE
(mV)
80
80
1 μ F
100k
0.47 μ F
SKIP
MAX682
SHDN
CXP
CXN
100k
1 μ F
0.47 μ F
SKIP
MAX682
SHDN
CXP
CXN
4.7 μ F
GND
PGND
GND
PGND
MAX684
50
0.22
0.1
0.47
80
Figure 6. Paralleling Two MAX682s
Table 4. Recommended Capacitor
Manufacturers
where ESR COUT is the ESR of the output filter capaci-
VALUE
DESCRIPTION MANUFACTURER
PHONE
NUMBER
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
47μF to
10μF
47μF to
10μF
0.1μF to
2.2μF
595D-series
tantalum
surface mount
TPS-series
surface mount
Ceramic
surface mount
Sprague
AVX
TDK
(603) 224-1961
(803) 946-0690
(847) 390-4373
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.
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
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.
8
_______________________________________________________________________________________
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