參數(shù)資料
型號(hào)： MAX1675EUA
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 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, PDSO8
封裝： UMAX-8
文件頁(yè)數(shù)： 9/12頁(yè)
文件大?。?/td> 160K
代理商： MAX1675EUA
S elec ting the Output V oltage
V
OUT
can be set to 3.3V or 5.5V by connecting the FB
pin to GND (5V) or OUT (3.3V) (Figures 5 and 6).
To adjust the output voltage, connect a resistor-divider
from V
OUT
to FB to GND (Figure 7). Choose a value
less than 260k
for R6. Use the following equation to
calculate R5:
R5 = R6 [(V
OUT
/ V
REF
) - 1]
where V
REF
= +1.3V and V
OUT
may range from 2V to
5V. The input bias current of FB has a maximum value
of 50nA which allows large-value resistors (R6
≤
260k
)
to be used.
Low-Battery Detec tion
The MAX1674/MAX1675/MAX1676 contain an on-chip
comparator for low-battery detection. If the voltage at
LBI falls below the internal reference voltage (1.30V),
LBO
(an open-drain output) sinks current to GND. The
low-battery monitor threshold is set by two resistors, R3
and R4 (Figures 5, 6, and 7). Since the LBI current is
less than 50nA, large resistor values (R4
≤
260k
) can
be used to minimize loading of the input supply.
Calculate R3 using the following equation:
R3 = R4 [(V
TRIP
/ V
REF
) - 1]
for V
TRIP
≥
1.3V. V
TRIP
is the level where the low-battery
detector output goes low, and V
REF
is the internal
1.30V reference. Connect a pull-up resistor of 100k
or
greater from
LBO
to OUT when driving CMOS circuits.
LBO
is an open-drain output, and can be pulled as
high as 6V regardless of the voltage at OUT. When LBI
is above the threshold, the
LBO
output is high imped-
ance. If the low-battery comparator is not used, ground
M
High-Effic ienc y, Low-S upply-Current,
Compac t, S tep-Up DC-DC Converters
_______________________________________________________________________________________
9
MAX1674
MAX1675
MAX1676
BATT
(MAX1676)
V
IN
LBI
REF
GND
R3
R1
200
R4
R2
100k
47
μ
F
10V
22
μ
H
0.1
μ
F
LX
LBO
0.1
μ
F
47
μ
F
+3.3V
200mA
V
OUT
LOW-BATTERY
OUTPUT
FB
SHDN
OUT
CLSEL
(MAX1676)
Figure 5. Preset Output Voltage of +3.3V
MAX1674
MAX1675
MAX1676
BATT
(MAX1676)
V
IN
LBI
REF
GND
R6
R5
R3
R1
200
R4
R2
100k
22
μ
H
47
μ
F
0.1
μ
F
LX
LBO
OUTPUT
2V to 5.5V
FB
SHDN
CLSEL
OUT
(MAX1676)
LOW-
BATTERY
OUTPUT
0.1
μ
F
47
μ
F
Figure 7. Setting an Adjustable Output
MAX1674
MAX1675
MAX1676
BATT
(MAX1676)
V
IN
LBI
REF
GND
R3
R1
200
R4
R2
100k
22
μ
H
47
μ
F
0.1
μ
F
LX
LBO
0.1
μ
F
47
μ
F
OUTPUT
5.0V,
150mA
FB
SHDN
OUT
CLSEL
(MAX1676)
LOW-
BATTERY
OUTPUT
Figure 6. Preset Output Voltage of +5V
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1675EUA+ 功能描述:直流/直流開(kāi)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(kāi)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
MAX1675EUA+T 功能描述:直流/直流開(kāi)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(kāi)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
MAX1675EUA-T 功能描述:直流/直流開(kāi)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(kāi)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 功能描述:直流/直流開(kāi)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(kāi)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+ 功能描述:直流/直流開(kāi)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(kāi)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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