参数资料
型号: MIC4576-5.0WU
厂商: Micrel Inc
文件页数: 1/8页
文件大小: 0K
描述: IC REG BUCK 5V 3A TO263-5
标准包装: 50
类型: 降压(降压)
输出类型: 固定
输出数: 1
输出电压: 5V
输入电压: 4 V ~ 36 V
频率 - 开关: 200kHz
电流 - 输出: 3A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: TO-263-6,D²Pak(5 引线+接片),TO-263BA
包装: 管件
供应商设备封装: TO-263-5
产品目录页面: 1093 (CN2011-ZH PDF)
其它名称: 576-1800-5
MIC4576-5.0WU-ND
MIC4576
General Description
The MIC4576 is a series of easy to use ?xed and adjustable
BiCMOS step-down (buck) switch-mode voltage regulators.
The 200kHz MIC4576 duplicates the pinout and function of
the 52kHz LM2576. The higher switching frequency may
allow up to a 2:1 reduction in output ?lter inductor size.
The MIC4576 is available in 3.3V, and 5V ?xed output ver-
sions or a 1.23V to 33V adjustable output version. Both
versions are capable of driving a 3A load with excellent line
and load regulation.
The feedback voltage is guaranteed to ±2% tolerance for
adjustable versions, and the output voltage is guaranteed to
±3% for ?xed versions, within speci?ed voltages and load con-
ditions. The oscillator frequency is guaranteed to ±10%.
In shutdown mode, the regulator draws less than 200μA
standby current. The regulator performs cycle-by-cycle
current limiting and thermal shutdown for protection under
fault conditions.
This series of simple switch-mode regulators requires a mini-
mum number of external components and can operate using
a standard series of inductors. Frequency compensation is
provided internally.
The MIC4576 is available in TO-220 (T) and TO-263 (U)
packages for the industrial temperature range.
Micrel, Inc.
MIC4576
200kHz Simple 3A Buck Regulator
Features
? Fixed 200kHz operation
? 3.3V, 5V, and adjustable output versions
? Voltage over speci?ed line and load conditions:
Fixed version: ±3% max. output voltage
Adjustable version: ±2% max. feedback voltage
? Guaranteed 3A switch current
? Wide 4V to 36V input voltage range
? Wide 1.23V to 33V output voltage range
? Requires minimum external components
? < 200μA typical shutdown mode
? 75% ef?ciency (adjustable version > 75% typical)
? Standard inductors are 25% of typical LM2576 values
? Thermal shutdown
? Overcurrent protection
? 100% electrical thermal limit burn-in
Applications
? Simple high-ef?ciency step-down (buck) regulator
? Ef?cient preregulator for linear regulators
? On-card switching regulators
? Positive-to-negative converter (inverting buck-boost)
? Battery Charger
? Negative boost converter
? Step-down to 3.3V for Intel Pentium?
and similar microprocessors
Typical Applications
Shutdown
Enable
8V to 36V
C1
470μF
63V
5
1
SHDN SW
MIC4576-5.0WT
V IN FB
GND
3
2
4
L1
33μH
D1
MBR360
5V/3A
C2
1000μF
16V
Fixed Regulator
Shutdown
Enable
16V to 36V
C1
470μF
63V
5
1
SHDN SW
MIC4576WT
V IN FB
GND
3
2
4
L1
68μH
MBR360
R2
13.0k
1%
R1
1.50k
1%
12V/3A
C2
1000μF
16V
Adjustable Regulator
Micrel, Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com
March 2006
1
MIC4576
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