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MAX1973

更新时间： 2024-11-10 14:57:27
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
15页 331K
描述
尺寸最小的1A、1.4MHz降压型稳压器

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MAX1973 数据手册

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19-2547; Rev 0; 7/02  
Smallest 1A, 1.4MHz Step-Down Regulators  
General Description  
Features  
o Tiny Circuit Footprint of 0.19in2  
o Ultra-Low Circuit Height of 1.8mm  
The MAX1973/MAX1974 are constant-frequency  
1.4MHz pulse-width-modulated (PWM) current-mode  
step-down regulators. The output voltage can be set as  
low as 0.75V using an external voltage-divider, or it can  
be set to preset outputs of 1V, 1.5V (MAX1974), 1.8V,  
or 2.5V (MAX1973) without requiring external resistors.  
The MAX1973 also includes a voltage-margining fea-  
ture that offsets the output voltage up or down 4% to  
facilitate board-level production testing.  
o 4.7µF Ceramic Input and Output Capacitors  
o 2.6V to 5.5V Input Voltage  
o 1A Output Current  
o 1% Accurate  
A fixed 1.4MHz operating frequency ensures operation  
outside the DSL frequency band, provides fast transient  
response, and allows the use of small external compo-  
nents. Only 4.7µF input and output ceramic capacitors  
are needed for 1A applications. Forced PWM operation  
ensures a constant switching frequency over all load  
conditions.  
o Built-In 4% Logic-Controlled Voltage ꢀargining  
(ꢀAX1973)  
o Preset 1V, 1.5V, 1.8V, 2.5V, or 0.75V to V  
IN  
Adjustable Output  
o Fixed-Frequency PWꢀ Current-ꢀode Operation  
o 1.4ꢀHz Switching Frequency, Operate Outside  
Output voltage accuracy is 1% over load, line, and  
temperature operating ranges. The MAX1973 features  
voltage margining; the MAX1974 provides a POK out-  
put to indicate when the output has reached 90% of its  
nominal regulation voltage. Both devices are available  
in small 10-pin µMAX packages.  
DSL Band  
o 100% Duty-Cycle Dropout Capability  
o Small External Components  
Applications  
Ordering Information  
Network Equipment  
PART  
TEꢀP RANGE  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
10 µMAX  
Cellular Base Stations  
ꢀAX1973EUB  
ꢀAX1974EUB  
DSL and Wireless Modems/Routers  
Optical Modules  
10 µMAX  
Central-Office DSL and Telecom  
DSP/ASIC Core and IO supplies  
Pin Configurations  
TOP VIEW  
Selector Guide appears at end of data sheet.  
FBSEL  
COMP  
FB  
1
2
3
4
5
10 CTL1  
Typical Operating Circuit  
9
8
7
6
IN  
MAX1973  
LX  
SS  
PGND  
CTL2  
OUTPUT  
INPUT  
2.6V TO 5.5V  
1.25V TO V  
1A  
IN  
GND  
IN  
LX  
FB  
µꢀAX  
COMP  
FBSEL  
COMP  
FB  
1
2
3
4
5
10 ON  
FBSEL MAX1973  
CTL1  
CTL2  
VOLTAGE  
MARGINING  
ON/OFF  
9
8
7
6
IN  
SS  
MAX1974  
LX  
GND  
PGND  
SS  
PGND  
POK  
GND  
MAX1974 OUTPUT DOWN TO 0.75V  
µꢀAX  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...15

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