参数资料
型号: MIC4684YM TR
厂商: Micrel Inc
文件页数: 1/16页
文件大小: 0K
描述: IC REG BUCK ADJ 2A 8SOIC
标准包装: 1
系列: SuperSwitcher™
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 可调至 1.235V
输入电压: 4 V ~ 30 V
PWM 型: 电压模式
频率 - 开关: 200kHz
电流 - 输出: 2A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
包装: 标准包装
供应商设备封装: 8-SOIC
产品目录页面: 1093 (CN2011-ZH PDF)
其它名称: 576-1553-6
MIC4684
General Description
The MIC4684 is a high-efficiency 200kHz stepdown (buck)
switching regulator. Power conversion efficiency of above
85% is easily obtainable for a wide variety of applications.
The MIC4684 achieves 2A of continuous current in an 8-lead
SO (small outline) package at 60°C ambient temperature.
High efficiency is maintained over a wide output current range
by utilizing a boost capacitor to increase the voltage available
to saturate the internal power switch. As a result of this high
efficiency, no external heat sink is required. The MIC4684,
housed in an SO-8, can replace larger TO-220 and TO-263
packages in many applications.
The MIC4684 allows for a high degree of safety. It has a wide
input voltage range of 4V to 30V (34V transient), allowing
it to be used in applications where input voltage transients
may be present. Built-in safety features include over-current
protection, frequency-foldback short-circuit protection, and
thermal shutdown.
The MIC4684 is available in an 8-lead SO package with a
junction temperature range of –40°C to +125°C.
Micrel, Inc.
MIC4684
2A High-Efficiency SuperSwitcher? Buck Regulator
Features
? SO-8 package with 2A continuous output current
? Over 85% efficiency
? Fixed 200kHz PWM operation
? Wide 4V to 30V input voltage range
? Output voltage adjustable to 1.235V
? All surface mount solution
? Internally compensated with fast transient response
? Over-current protection
? Frequency foldback short-circuit protection
? Thermal shutdown
Applications
? Simple high-efficiency step-down regulator
? 5V to 3.3V/1.7A converter (60°C ambient)
? 12V to 1.8V/2A converter (60°C ambient)
? On-card switching regulator
? Dual-output ±5V converter
? Battery charger
Ordering Information
Part Number
Standard
Pb-Free
MIC4684BM MIC4684YM
Voltage
Adj
Junction Temp. Range
-40°C to +125°C
Package
SOP-8
V IN
MIC4684BM
6.5V to 25V
VIN
BS
EN
SW
C IN
33μF
V OUT = 2.5V
Typical Application
3
8
FB
35V GND
2, 6, 7
4
1
5
C BS
0.33μF/50V
68μH
3A
40V
R1
3.01k
R2
3.01k
V OUT
2.5V/1.5A
330μF
6.3V
100
80
60
40
Efficiency
vs. Output Current
V OUT = 3.3V
V OUT = 1.8V
Adjustable Buck Converter
20
V IN = 5.0V
0
0
0. 5 1 1. 5
OUTPUT CURRENT (A)
2
Efficiency vs. Output Current
SuperSwitcher is a trademark of Micrel, Inc.
Micrel, Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com
January 2010
1
M9999-012610
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