Datasheet > UC3870N-2

UC3870N-2

更新时间： 2024-11-28 23:38:59

品牌	Logo	应用领域
其他 - ETC		开关光电二极管控制器
页数	文件大小	规格书
10页	354K
描述
Current-Mode SMPS Controller

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数据手册

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UC3870N-2 数据手册

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 Pentium^Pro 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

12 3 4 5 6 7...10

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