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參數(shù)資料
| 型號(hào)： | MAX1676EUB |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters |
| 中文描述： | 1.5 A SWITCHING REGULATOR, 500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | UMAX-10 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 160K |
| 代理商： | MAX1676EUB |
M
LBI and
LBO
. For V
TRIP
less than 1.3V, configure the
comparator as shown in Figure 8. Calculate the value of
the external resistors R3 and R4 as follows:
R3 = R4(V
REF
- V
TRIP
) / (V
OUT
- V
REF
)
Since the low-battery comparator is noninverting, exter-
nal hysteresis can be added by connecting a resistor
between
LBO
and LBI as shown in Figure 9. When
LBO
is high, the series combination of R2 and R7 source
current into the LBI summing junction.
Applic ations Information
Induc tor S elec tion
An inductor value of 22μH performs well in most appli-
cations. The MAX1674/MAX1675/MAX1676 will also
work with inductors in the 10μH to 47μH range. Smaller
inductance values typically offer a smaller physical size
for a given series resistance, allowing the smallest
overall circuit dimensions. However, due to higher peak
inductor currents, the output voltage ripple (I
PEAK
x
output filter capacitor ESR) also tends to be higher.
Circuits using larger inductance values exhibit higher
output current capability and larger physical dimen-
sions for a given series resistance. The inductor’s incre-
mental saturation current rating should be greater than
the peak switch-current limit, which is 1A for the
MAX1674, 500mA for the MAX1675, and 1A or 0.5A for
the MAX1676. However, it is generally acceptable to
bias the inductor into saturation by as much as 20%,
although this will slightly reduce efficiency. Table 1 lists
suggested components.
The inductor’s DC resistance significantly affects effi-
ciency. See Table 2 for a comparison of inductor speci-
fications. Calculate the maximum output current as
follows:
where I
OUT(MAX)
= maximum output current in amps
V
BATT
= input voltage
L = inductor value in μH
η
= efficiency (typically 0.9)
t
OFF
= LX switch’s off-time in μs
R
P
= resistance of P-channel MOSFET in
I
LIM
= 0.5A or 1.0A
I
V
V
V
L
t
R
V
OUT MAX
BATT LIM
OUT
BATT
OFF
P
OUT
)
=
+
± 1 2
±
η
High-Effic ienc y, Low-S upply-Current,
Compac t, S tep-Up DC-DC Converters
10
______________________________________________________________________________________
MAX1674
MAX1675
MAX1676
BATT
(MAX1676)
V
IN
LBI
REF
GND
R3
R1
200
R4
22
μ
H
47
μ
F
0.1
μ
F
LX
LBO
V
OUT
FB
R2
100k
SHDN
OUT
CLSEL
(MAX1676)
LOW-
BATTERY
OUTPUT
0.1
μ
F
47
μ
F
Figure 8. Setting Resistor Values for the Low-Battery Indicator
when V
IN
< 1.3V
MAX1674
MAX1675
MAX1676
LBI
GND
V
TRIP
(V
H
, V
L
)
R3
R4
R7
V
H
IS THE UPPER TRIP LEVEL
V
L
IS THE LOWER TRIP LEVEL
WHERE
R2
100k
LBO
OUT
V
OUT
0.1
μ
F
47
μ
F
V = 1.3V
V = 1.3V
)
+
+
)
+
+
(
.
) (
R
)
R
( .
1 3
)
1
3
7
3
4
1
3
4
1 3
2
3
7
R
R
R
R
R
R
V
V R
V
OUT
Figure 9. Adding External Hysteresis to the Low-Battery
Indicator
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1676EUB+ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Compact Step-Up 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 |
| MAX1676EUB+T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Compact Step-Up 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 |
| MAX1676EUB-T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Compact Step-Up 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 |
| MAX1676EVKIT | 功能描述:電源管理IC開發(fā)工具 Evaluation Kit for the MAX1676 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| MAX1677EEE | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Compact Step-Up & LCD Bias DC/DC 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 |
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