Datasheet > UC3870N-1

UC3870N-1

更新时间： 2024-02-05 08:59:47

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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技术参数
数据手册

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UC3870N-1 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Obsolete	零件包装代码：	DIP
包装说明：	DIP, DIP18,.3	针数：	18
Reach Compliance Code：	not_compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.79
Is Samacsys：	N	模拟集成电路 - 其他类型：	SWITCHING CONTROLLER
控制模式：	CURRENT-MODE	控制技术：	PULSE WIDTH MODULATION
最大输入电压：	24 V	最小输入电压：	12 V
标称输入电压：	12 V	JESD-30 代码：	R-PDIP-T18
功能数量：	1	端子数量：	18
最高工作温度：	70 °C	最低工作温度：
最大输出电流：	1 A	封装主体材料：	PLASTIC/EPOXY
封装代码：	DIP	封装等效代码：	DIP18,.3
封装形状：	RECTANGULAR	封装形式：	IN-LINE
峰值回流温度（摄氏度）：	NOT SPECIFIED	认证状态：	Not Qualified
子类别：	Switching Regulator or Controllers	表面贴装：	NO
切换器配置：	PUSH-PULL	最大切换频率：	300 kHz
技术：	BIPOLAR	温度等级：	COMMERCIAL
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
Base Number Matches：	1

UC3870N-1 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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