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參數資料
| 型號： | MAX748A |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 通用總線功能 |
| 英文描述： | Synchronous 4-Bit Up/Down Binary Counters 20-LCCC -55 to 125 |
| 中文描述： | 3.3V、降壓型、電流模式PWM DC-DC轉換器 |
| 文件頁數： | 1/12頁 |
| 文件大小： | 135K |
| 代理商： | MAX748A |
__________________General Desc ription
The MAX748A/MAX763A are 3.3V-output CMOS, step-
down switching regulators. The MAX748A accepts
inputs from 3.3V to 16V and delivers up to 500mA. The
MAX763A accepts inputs between 3.3V and 11V and
delivers up to 500mA. Typical efficiencies are 85% to
90%. Quiescent supply current is 1.4mA (MAX763A),
and only 0.2μA in shutdown.
Pulse-width-modulation (PWM) current-mode control pro-
vides precise output regulation and excellent transient
responses. Output voltage accuracy is guaranteed to be
±5% over line, load, and temperature variations.
Fixed-frequency switching allows easy filtering of output
ripple and noise, as well as the use of small external
components. A 22μH inductor works in most applica-
tions, so no magnetics design is necessary.
The MAX748A/MAX763A also feature cycle-by-cycle cur-
rent limiting, overcurrent limiting, undervoltage lockout,
and programmable soft-start protection. The MAX748A
is available in 8-pin DIP and 16-pin wide SO packages;
the MAX763A comes in 8-pin DIP and SO packages.
___________________________Applic ations
5V-to-3.3V Converters
Cellular Phones
Portable Instruments
Hand-Held Computers
Computer Peripherals
________________________________Features
o
Up to 500mA Load Currents
o
Guaranteed 159kHz to 219.5kHz Current-Mode
PWM
o
85% to 90% Efficiencies
o
1.7mA Quiescent Current (MAX748A)
1.4mA Quiescent Current (MAX763A)
o
0.2μA Shutdown Supply Current
o
22μH Preselected Inductor Value;
No Component Design Required
o
Overcurrent, Soft-Start, and Undervoltage
Lockout Protection
o
Cycle-by-Cycle Current Limiting
o
8-Pin DIP/SO Packages (MAX763A)
_________________Ordering Information
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
8 Plastic DIP
16 Wide SO
Dice*
8 Plastic DIP
16 Wide SO
8 CERDIP
MAX748A
CPA
MAX748ACWE
MAX748AC/D
MAX748AEPA
MAX748AEWE
MAX748AMJ A
M
3.3V, S tep-Down,
Current-Mode PWM DC-DC Converters
_______________________________________________________________________Maxim Integrated Products
Call toll free 1-800-998-8800 for free samples or literature.
1
19-0190; Rev 0; 9/93
Ordering Information continued on last page.
*Contact factory for dice specifications.
____________________Pin Configurations
MAX748A
SHDN
INPUT
3.3V TO 16V
V+
LX
OUT
CC
GND
SS
REF
ON/OFF
22
μ
H
OUTPUT
3.3V
100
μ
F
____________Typic al Operating Circ uit
TOP VIEW
1
2
3
4
8
7
6
5
V+
LX
GND
OUT
CC
SS
REF
MAX748A
MAX763A
DIP
SHDN
Pin Configurations continued on last page.
相關PDF資料 |
PDF描述 |
|---|---|
| MAX748AEWE | Circular Connector; No. of Contacts:26; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:17; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:17-26 RoHS Compliant: No |
| MAX763ACPA | 3.3V, Step-Down, Current-Mode PWM DC-DC Converters |
| MAX763ACSA | 3.3V, Step-Down, Current-Mode PWM DC-DC Converters |
| MAX763AEPA | 3.3V, Step-Down, Current-Mode PWM DC-DC Converters |
| MAX763AESA | 3.3V, Step-Down, Current-Mode PWM DC-DC Converters |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX748AC/D | 功能描述:直流/直流開關轉換器 1.7mA Quiescent Current-Mode PWM DC-DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX748AC/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX748ACPA | 功能描述:直流/直流開關轉換器 3.3V Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX748ACPA+ | 功能描述:直流/直流開關轉換器 3.3V Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX748ACWE | 功能描述:直流/直流開關轉換器 3.3V Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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