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)： 8/10頁
文件大小： 817K
代理商： MAX1947ETA24
M
Shutdown
The MAX1947 enters shutdown mode when
SHDN
is
driven low. During shutdown, the synchronous rectifier
disconnects the output from the input, eliminating the DC
conduction path that normally exists with traditional boost
converters in shutdown mode. The output is actively dis-
charged to ground through an internal 500
resistor. The
quiescent current is reduced to 2μA while in shutdown
mode. Drive
SHDN
high for normal operation. The output
reaches regulation approximately 650μs after
SHDN
goes high.
Applications Information
Inductor Selection
An inductor value of 4.7μH performs well in most appli-
cations. The MAX1947 also works with inductors in the
2.2μH to 6.8μH range. Smaller inductance values typi-
cally offer a smaller physical size for a given series
resistance, allowing the smallest overall circuit dimen-
sions but with lower output-current capability. Circuits
using larger inductance values exhibit higher output-
current capability, but are larger for the same series
resistance and current rating.
The inductor’s incremental saturation current rating
should be greater than the peak switch-current limit.
However, it is generally acceptable to bias the inductor
into saturation by as much as 20%, although this
slightly reduces efficiency (see the
Electrical
Characteristics
for the MAX1947 NFET current limit).
Table 1 lists the suggested components for several typ-
ical applications. Also, the inductor’s DC resistance sig-
nificantly affects efficiency.
Low Input/Output Voltage
Step-Up DC-DC Converter with
RESET
8
_______________________________________________________________________________________
APPLICATION
LOAD
INPUT CAPACITOR (μF)
2.2
2.2
2.2
2.2
2.2
2.2
OUTPUT CAPACITOR (μF)
4.7
10
4.7
10
4.7
10
INDUCTOR (μH)
3.3
3.3
4.7
4.7
6.8
6.8
≤
50% full load
>50% full load
≤
50% full load
>50% full load
≤
50% full load
>50% full load
1-Cell Input,
Output < 2.7V
1-Cell Input,
Output > 2.7V
2-Cell Input
Table 1. Suggested Component Values
MANUFACTURER
Sumida
PART
Inductor
PART NUMBER
CDRH3D16 series
PHONE
WEBSITE
81-3-3667-3381
www.sumida.com
Output capacitors
4.7μF JMK212BJ475MG,
10μF JMK212BJ106MG
Taiyo Yuden
Input capacitors
2.2μF LMK107BJ225MA
408-573-4150
www.t-yuden.com
Output capacitors
4.7μF C2012X5R0J475K,
10μF C2012X5R0J106K
TDK
Input capacitors
2.2μF C1608X5R03225M
888-835-6646
www.TDK.com
Table 2. Suggested Component Manufacturers
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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(fēng)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(fēng)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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