參數(shù)資料
型號： MAX757
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)： 1/8頁
文件大?。?/td> 129K
代理商： MAX757
M
3.3V /5V /Adjustable-Output,
S tep-Up DC-DC Converters
________________________________________________________________ Maxim Integrated Products
Call toll free 1-800-998-8800 for free samples or literature.
1
19-0113; Rev. 2; 1/95
_______________General Desc ription
The MAX756/MAX757 are CMOS step-up DC-DC switch-
ing regulators for small, low input voltage or battery-pow-
ered systems. The MAX756 accepts a positive input
voltage down to 0.7V and converts it to a higher pin-
selectable output voltage of 3.3V or 5V. The MAX757 is
an adjustable version that accepts an input voltage down
to 0.7V and generates a higher adjustable output voltage
in the range from 2.7V to 5.5V. Typical full-load efficiencies
for the MAX756/MAX757 are greater than 87%.
The MAX756/MAX757 provide three improvements over
previous devices. Physical size is reduced—the high
switching frequencies (up to 0.5MHz) made possible by
MOSFET power transistors allow for tiny (<5mm diameter)
surface-mount magnetics. Efficiency is improved to 87%
(10% better than with low-voltage regulators fabricated in
bipolar technology). Supply current is reduced to 60μA
by CMOS construction and a unique constant-off-time
pulse-frequency modulation control scheme.
________________________Applic ations
3.3V to 5V Step-Up Conversion
Palmtop Computers
Portable Data-Collection Equipment
Personal Data Communicators/Computers
Medical Instrumentation
2-Cell & 3-Cell Battery-Operated Equipment
Glucose Meters
____________________________Features
o
Operates Down to 0.7V Input Supply Voltage
o
87% Efficiency at 200mA
o
60μA Quiescent Current
o
20μA Shutdown Mode with Active Reference and
LBI Detector
o
500kHz Maximum Switching Frequency
o
±1.5% Reference Tolerance Over Temperature
o
Low-Battery Detector (LBI/LBO)
o
8-Pin DIP and SO Packages
______________Ordering Information
*Dice are tested at T
A
= +25°C only.
_________________Pin Configurations
1
2
3
4
8
7
6
5
LX
GND
OUT
LBI
LBO
REF
3/5
SHDN
MAX756
DIP/SO
TOP VIEW
1
2
3
4
8
7
6
5
LX
GND
OUT
LBI
LBO
REF
FB
SHDN
MAX757
DIP/SO
MAX756
SHDN
1
3/5
2
REF
3
LBI
5
LX
7
150
μ
F
GND
OUT
6
INPUT
2V to V
OUT
1N5817
OUTPUT
5V at 200mA
or
3.3V at 300mA
100
μ
F
LBO
4
8
0.1
μ
F
22
μ
H
LOW-BATTERY
DETECTOR OUTPUT
__________Typic al Operating Circ uit
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
MAX756
CPA
MAX756CSA
MAX756C/D
MAX756EPA
MAX756ESA
MAX757
CPA
MAX757CSA
MAX757C/D
MAX757EPA
MAX757ESA
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX757C/D 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Adjustable 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
MAX757C/D DIE 制造商:Maxim Integrated Products 功能描述:
MAX757CPA 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
MAX757CPA+ 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
MAX757CSA 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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