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UC1870DW-1

更新时间: 2024-11-13 23:38:51
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其他 - ETC 模拟IC
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10页 354K
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Analog IC

UC1870DW-1 数据手册

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UC1870 -1/ -2  
UC2870 -1/ -2  
UC3870 -1/ -2  
High Efficiency, Synchronous, Step-down (Buck) Controllers  
FEATURES  
DESCRIPTION  
Operation to 36V Input Voltage  
The UC3870 family of synchronous step-down (Buck) regulators provides  
high efficiency power conversion from an input voltage range of 4.5 to 36  
volts. The UC3870 is tailored for battery powered applications such as lap-  
top computers, consumer products, communications systems, and aero-  
space which demand high performance and long battery life. The  
synchronous regulator replaces the catch diode in the standard buck regu-  
lator with a low Rds(on) N-channel MOSFET switch allowing for significant  
efficiency improvements. The high side N-channel MOSFET switch is  
driven out of phase from the low side N-channel MOSFET switch by an  
on-chip bootstrap circuit which requires only a single external capacitor to  
develop the regulated gate drive. Fixed frequency, average current mode  
control provides the regulator with inherent slope compensation, tight regu-  
lation of the output voltage, and superior load and line transient response.  
Switching frequencies up to 300kHz are possible.  
Fixed Frequency Average Current  
Mode Control  
2V to 3.5V Output Voltage when  
Combined with UC3910 Precision  
Reference/DAC  
Drives External N-Channel MOSFETs  
for Highest Efficiency  
Sleep Mode Current <75 A  
Complementary 1 Amp Outputs with  
Regulated Gate Drive Voltage  
LDO (Low Drop Out) Virtual 100%  
Duty Cycle Operation  
The UC3870-1,-2 is designed to interface directly with precision references  
like the UC3910. When combined with the UC3910, output voltages be-  
tween 2V to 3.5V in 100mV increments and 1% accuracy are attainable.  
This makes the UC3870-1,-2 ideal for powering high performance micro-  
processors like the Intel PentiumPro and others.  
Non-Overlapping Gate Drives  
(continued)  
BLOCK DIAGRAM  
UDG-96158  
Pin Numbers refer to the DIL-18 Package.  
SLUS288A - AUGUST 1998 - REVISED OCTOBER 2001  

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