參數(shù)資料
型號： MAX756
廠商： Maxim Integrated Products, Inc.
元件分類： DC/DC變換器
英文描述： 3.3V/5V/Adjustable-Output, Step-Up DC-DC Converters(可調(diào),高效率,步升DC-DC變換器)
中文描述： 3.3V/5V/可調(diào)輸出、升壓型DC-DC轉(zhuǎn)換器
文件頁數(shù)： 6/8頁
文件大小： 129K
代理商： MAX756
M
3.3V /5V /Adjustable-Output,
S tep-Up DC-DC Converters
6
_______________________________________________________________________________________
where V
is the desired threshold of the low-battery
detector, R3 and R4 are the input divider resistors at
LBI, and V
REF
is the internal 1.25V reference.
Since the LBI current is less than 100nA, large resistor
values (typically 10k
to 200k
) can be used for R3
and R4 to minimize loading of the input supply.
When the voltage at LBI is below the internal threshold,
LBO sinks current to GND. A pull-up resistor of 10k
or more connected from LBO to V
can be used
when driving CMOS circuits. Any pull-up resistor con-
nected to LBO should not be returned to a voltage
source greater than V
. When LBI is above the
threshold, the LBO output is off. The low-battery com-
parator and reference voltage remain active when the
MAX756/MAX757 is in shutdown mode.
If the low-battery comparator is not used, connect LBI
to V
IN
and leave LBO open.
Induc tor S elec tion
The inductors should have a saturation (incremental)
current rating equal to or greater than the peak switch-
current limit, which is 1.2A worst-case. However, it’s
generally acceptable to bias the inductor into satura-
tion by 20%, although this will reduce the efficiency.
The 22μH inductor shown in the typical applications cir-
cuit is sufficient for most MAX756/MAX757 application
circuits. Higher input voltages increase the energy
transferred with each cycle, due to the reduced
input/output differential. Minimize excess ripple due to
increased energy transfer by reducing the inductor
value (10μH suggested).
The inductor’s DC resistance significantly affects effi-
ciency. For highest efficiency, limit L1’s DC resistance
to 0.03
or less. See Table 1 for a list of suggested
inductor suppliers.
Table 1. Component Suppliers
AVX
USA:
(207) 282-5111, FAX (207) 283-1941
(800) 282-9975
(708) 639-6400, FAX (708) 639-1969
(407) 241-7876, FAX (407) 241-9339
CoilCraft
Coiltronics
Collmer
Semiconductor
Motorola
Nichicon
USA:
USA:
USA:
USA:
USA:
J apan: +81-7-5231-8461, FAX (+81-) 7-5256-4158
USA:
(805) 867-2555, FAX (805) 867-2556
J apan: +81-3-3494-7411, FAX (+81-) 3-3494-7414
USA:
(619) 661-6835
J apan: +81-720-70-1005, FAX (+81-720-) 70-1174
USA:
(603) 224-1961, FAX (603) 224-1430
USA:
(708) 956-0666
J apan: +81-3-3607-5111, FAX (+81-3-) 3607-5428
(214) 233-1589
(602) 244-3576, FAX (602) 244-4015
(708) 843-7500, FAX (708) 843-2798
Nihon
Sanyo OS-CON
Sprague
Sumida
United
Chemi-Con
USA:
(708) 696-2000, FAX (708) 640-6311
Capac itor S elec tion
A 100μF, 10V surface-mount (SMT) tantalum capacitor
typically provides 50mV output ripple when stepping
up from 2V to 5V at 200mA. Smaller capacitors, down
to 10μF, are acceptable for light loads or in applica-
tions that can tolerate higher output ripple.
MAX757
REF
3
LX
7
C1
150
μ
F
GND
OUT
6
V
IN
D1
1N5817
V
OUT
LBO
4
8
C3
0.1
μ
F
L1
22
μ
H
LBI
5
C2
100
μ
F
SHDN
1
FB
2
R1
R2
R3
R4
Figure 1. Standard Application Circuit
PRODUCTION
METHOD
INDUCTORS
CAPACITORS
Surface-Mount
AVX
TPS series
Sprague
595D series
Miniature
Through-Hole
Sumida
RCH654-220
Low-Cost
Through-Hole
Sumida
CD54-220 (22μH)
CoilCraft
DT3316-223
Coiltronics
CTX20-1
Sanyo OS-CON
OS-CON series
low-ESR organic
semiconductor
CoilCraft
PCH-27-223
Nichicon
PL series
low-ESR
electrolyic
United Chemi-Con
LXF series
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX756C/D 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Adjustable Output 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
MAX756CPA 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3.3/5/AdjV-Out 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
MAX756CPA+ 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3.3/5/AdjV-Out 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
MAX756CSA 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3.3/5/AdjV-Out 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
MAX756CSA+ 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3.3/5/AdjV-Out 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
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