参数资料
型号: MIC2204BML
厂商: Micrel Inc
文件页数: 10/11页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 0.6A 10MLF
标准包装: 100
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 可调至 1V
输入电压: 2.3 V ~ 5.5 V
PWM 型: 电压模式
频率 - 开关: 2MHz
电流 - 输出: 600mA
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: 10-VFDFN 裸露焊盘,10-MLF?
包装: 托盘
供应商设备封装: 10-MLF?(3x3)
MIC2204
PWM Operation
The MIC2204 is a pulsewidth modulation (PWM) controller.
By controlling the ratio of on-to-off time, or duty cycle, a
regulated DC output voltage is achieved. As load or supply
voltage changes, so does the duty cycle to maintain a
constant output voltage. In cases where the input supply runs
into a dropout condition, the MIC2204 will run at 100% duty
cycle.
The MIC2204 provides constant switching at 2MHz with
synchronous internal MOSFETs. The internal MOSFETs
include a high-side P-Channel MOSFET from the input
supply to the switch pin and an N-Channel MOSFET from the
switch pin to ground. Since the low-side N-Channel MOSFET
provides the current during the off cycle, a free wheeling
Schottky diode from the switch node to ground is not required.
PWM control provides fixed frequency operation. By main-
taining a constant switching frequency, predictable funda-
mental and harmonic frequencies are achieved. Other meth-
ods of regulation, such as burst and skip modes, have
frequency spectrums that change with load and can interfere
with sensitive communication equipment.
Micrel, Inc.
Synchronization
SYNC_IN allows the user to change the frequency from
2MHz up to 2.5MHz or down to 1.8MHz. This controls the
fundamental frequency and all the resultant harmonics. Main-
taining a predictable frequency creates the ability to either
shift the harmonics away from sensitive carrier and IF fre-
quency bands, or to accurately filter out specific harmonic
frequencies.
Connecting the SYNC_OUT function pin to the SYNC_IN of
other MIC2204s will synchronize multiple MIC2204s in a
daisy-chain. Synchronizing multiple MIC2204s means that
regulators will run at the same fundamental frequency, result-
ing in matched harmonic frequencies and simplifying design
for sensitive communication equipment.
M9999-042205
10
April 2005
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