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參數(shù)資料
| 型號： | MAX1947ETA24 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, DSO8 |
| 封裝： | 3 X 3 MM, 0.80 MM HEIGHT, MO229/WEEC, EXPOSED PAD, TDFN-8 |
| 文件頁數(shù)： | 9/10頁 |
| 文件大?。?/td> | 817K |
| 代理商： | MAX1947ETA24 |
Calculate the maximum output current (I
OUTMAX
) using
inductor ripple current (I
RIPPLE
) and duty cycle (D) as
follows:
Here, I
LIM
is the NFET current limit (800mA typ), t
OFF
is
the LX switch’s off-time (0.25μs typ), and R
L
is the
series resistance of the inductor.
Capacitor Selection
The MAX1947 is specifically designed for using small,
inexpensive, low-ESR ceramic capacitors. X5R and
X7R dielectrics are recommended when operating over
wide temperature ranges. Bypass the output of the
MAX1947 with 10μF when using maximum load cur-
rents. When using less than half the maximum load cur-
rent capability, the output capacitor can be reduced to
4.7μF. Bypass the input with a 2.2μF or larger ceramic
capacitor. Table 1 lists the suggested values for the
input and output capacitors for typical applications.
PC Board Layout and Grounding
Careful printed circuit-board layout is important for min-
imizing ground bounce and noise. Keep the IC’s GND
pins and the ground leads of the input and output filter
capacitors very close together. Connect GND and
PGND directly to the exposed paddle. In addition, keep
all connections to the OUT and LX pins as short as pos-
sible. To maximize output power and efficiency and
minimize output ripple voltage, use short, wide traces
from the input and output. A sample layout is available
in the MAX1947 evaluation kit.
Chip Information
TRANSISTOR COUNT: 5156
PROCESS: BiCMOS
M
Low Input/Output Voltage
Step-Up DC-DC Converter with
RESET
_______________________________________________________________________________________
9
I
V
I
R
(
R
V
)
L t
R
(
R
D
V
ILIM
(
IRIPPLE
2
RDS ONPFET
(
R
V
V
ILIM
(
IRIPPLE
2
RDS ONPFET
(
R
R
RIPPLE
OUT
LIM
DS ON PFET
(
L
BATT
OFF
DS ON PFET
(
L
OUT
L
BATT
OUT
DS ON NFET
(
L
=
+
×
+
+
+
=
+
×
+
×
+
)
/
)
(
)
)
)
(
)
)
)
)
)
2
=
) (
I
ILIM
(
IRIPPLE
2
D
OUTMAX
)
1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1947ETA25 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1947ETA25+ | 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP UP 8TDFN EP - Rail/Tube |
| MAX1947ETA25+T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Step-Up w/RESET DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1947ETA25-T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1947ETA30+ | 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP UP 8TDFN EP - Rail/Tube 制造商:Maxim Integrated Products 功能描述:STEP-UP DC-DC CONVERTER WITH ACTIVE-LOW |
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