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參數資料
| 型號： | MAX747 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Parallel-Load 8-Bit Shift Registers 16-CFP -55 to 125 |
| 中文描述： | 高效率、PWM、降壓型控制器(外部P溝道驅動器) |
| 文件頁數： | 1/12頁 |
| 文件大小： | 136K |
| 代理商： | MAX747 |
_______________General Desc ription
The MAX747 high-efficiency, high-current, step-down
controller drives external P-channel FETs. It provides
90% to 95% efficiency from a 6V supply with load
currents ranging from 50mA up to 2.5A. It uses a
pulse-width-modulating (PWM) current-mode control
scheme to provide precise output regulation and low
output noise. The MAX747’s 4V to 15V input voltage
range, a fixed 5V/adjustable (Dual-Mode) output, and
a current limit set with an external resistor make this
device ideal for a wide range of applications.
High efficiency is maintained with light loads due to a
proprietary dual-control (Idle-Mode ) scheme that
minimizes switching losses by reducing the switching
frequency at light loads. The low 800μA quiescent
current and ultra-low 0.6μA shutdown current further
extend battery life.
External components are protected by the MAX747’s
cycle-by-cycle current limit. The MAX747 also features a
2V ±1.5% reference, a comparator for low-battery
detection or level translating, as well as soft-start and
shutdown capability.
The MAX746, discussed in a separate data sheet,
functions similarly to the MAX747, but it drives N-channel
logic level FETs on the high side.
________________________Applic ations
Notebook Power Supplies
Personal Digital Assistants
Battery-Operated Equipment
Cellular Phones
5V to 3.3V Green PC Applications
____________________________Features
o
90% to 95% Efficiency for 50mA to 2.5A
Output Currents
o
4V to 15V Input Voltage Range
o
Low 800μA Supply Current
o
0.6μA Shutdown Current
o
Drives External P-Channel FETs
o
Cycle-by-Cycle Current Limiting
o
2V ±1.5% Accurate Reference Output
o
Adjustable Soft-Start
o
Precision Comparator for Power-Fail or
Low-Battery Warning
______________Ordering Information
* Contact factory for dice specifications.
__________Typic al Operating Circ uit
M
High-Effic ienc y PWM, S tep-Down
P-Channel DC-DC Controller
________________________________________________________________ Maxim Integrated Products
Call toll free 1-800-998-8800 for free samples or literature.
1
OU5V
2.3A
6INPUT
AV+
EXT
OUT
GND
430μF
REF
MAX747
CS
SHDN
ON/OFF
LBI
LOW-BATTERY
DETECTOR
INPUT
V+
LOW-BATTERY
DETECTOR
OUTPUT
AGND
FB
CC
SS
LBO
5Om
5O
μ
H
P
0.1μF
100μF
__________________Pin Configuration
SS
1
2
3
4
14
13
12
11
GND
CC
FB
AV+
LBI
DIP/SO
TOP VIEW
MAX747
5
6
7
10
9
8
OUT
AGND
REF
SHDN
LBO
V+
EXT
CS
19-0171; Rev 1; 9/93
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
-55°C to +125°C
PIN-PACKAGE
14 Plastic DIP
14 Narrow SO
Dice*
14 Plastic DIP
14 Narrow SO
14 CERIDIP
MAX747CPD
MAX747CSD
MAX747C/D
MAX747EPD
MAX747ESD
MAX747MJ D
Dual-Mode and Idle-Mode are trademarks of Maxim Integrated Products.
相關PDF資料 |
PDF描述 |
|---|---|
| MAX747CPD | Parallel-Load 8-Bit Shift Registers 16-CFP -55 to 125 |
| MAX747CSD | Parallel-Load 8-Bit Shift Registers 20-LCCC -55 to 125 |
| MAX747EPD | Parallel-Load 8-Bit Shift Registers 16-CDIP -55 to 125 |
| MAX747ESD | Parallel-Load 8-Bit Shift Registers 16-CFP -55 to 125 |
| MAX747MJD | Parallel-Load 8-Bit Shift Registers 16-CDIP -55 to 125 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX7472UTI+ | 制造商:Maxim Integrated Products 功能描述: |
| MAX7474EAE+ | 功能描述:視頻 IC Adaptive Equalizer f/Vid Over Twist Pr RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| MAX7474EAE+T | 功能描述:視頻 IC Adaptive Equalizer f/Vid Over Twist Pr RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| MAX7474EVKIT+ | 功能描述:視頻 IC 開發工具 MAX7474 Eval Kit RoHS:否 制造商:Texas Instruments 產品:Evaluation Boards 類型:YPbPr to RGBHV Converters 工具用于評估:LMH1251 工作電源電壓:5 V |
| MAX747CPD | 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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