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MAX1920

更新时间： 2024-11-30 22:57:59
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美信 - MAXIM 转换器
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9页 371K
描述
Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23

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19-2296; Rev 1; 7/02  
Low-Voltage, 400mA Step-Down  
DC-DC Converters in SOT23  
General Description  
Features  
ꢀ 400mA Guaranteed Output Current  
The MAX1920/MAX1921 step-down converters deliver  
over 400mA to outputs as low as 1.25V. These convert-  
ers use a unique proprietary current-limited control  
scheme that achieves over 90% efficiency. These  
devices maintain extremely low quiescent supply current  
(50µA), and their high 1.2MHz (max) operating frequency  
permits small, low-cost external components. This combi-  
nation makes the MAX1920/MAX1921 excellent high-  
efficiency alternatives to linear regulators in space-  
constrained applications.  
ꢀ Internal Synchronous Rectifier for >90%  
Efficiency  
ꢀ Tiny 6-Pin SOT23 Package  
ꢀ Up to 1.2MHz Switching Frequency for Small  
External Components  
ꢀ 50µA Quiescent Supply Current  
ꢀ 0.1µA Logic-Controlled Shutdown  
ꢀ 2V to 5.5V Input Range  
Internal synchronous rectification greatly improves effi-  
ciency and eliminates the external Schottky diode  
required in conventional step-down converters. Both  
devices also include internal digital soft-start to limit  
input current upon startup and reduce input capacitor  
requirements.  
ꢀ Fixed 1.5V, 1.8V, 2.5V, 3V, and 3.3V Output  
Voltages (MAX1921)  
ꢀ Adjustable Output Voltage (MAX1920)  
The MAX1920 provides an adjustable output voltage  
(1.25V to 4V). The MAX1921 provides factory-preset  
output voltages (see the Selector Guide). Both are  
available in space-saving 6-pin SOT23 packages.  
ꢀ
1.5% Initial Accuracy  
ꢀ Soft-Start Limits Startup Current  
Ordering Information  
Applications  
PART  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
Next-Generation Wireless Handsets  
PDAs, Palmtops, and Handy-Terminals  
Battery-Powered Equipment  
MAX1920EUT-T  
MAX1921EUT_ _-T  
6 SOT23-6  
6 SOT23-6  
Note: The MAX1921 offers five preset output voltage options.  
See the Selector Guide, and then insert the proper designator  
into the blanks above to complete the part number.  
CDMA Power Amplifier Supply  
Typical Operating Circuit  
Pin Configuration  
INPUT  
OUTPUT  
4.7µH  
TOP VIEW  
2V TO 5.5V  
1.5V UP TO 400mA  
IN  
LX  
PGND  
OUT  
4.75kΩ  
5600pF  
C
IN  
4.7µF  
IN  
AGND  
SHDN  
1
2
3
6
5
4
LX  
MAX1921  
AGND  
MAX1920  
MAX1921  
PGND  
OUT (FB)  
ON  
SHDN  
OFF  
SOT23-6  
( ) ARE FOR MAX1920 ONLY  
________________________________________________________________ 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...9

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