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参数资料
| 型号： | MIC2288YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 6/11页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 1A 8MLF |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.24 V ~ 34 V |
| 输入电压： | 2.5 V ~ 10 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VFDFN 裸露焊盘，8-MLF? |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-MLF?（2x2） |
| 产品目录页面： | 1082 (CN2011-ZH PDF) |
| 其它名称： | 576-1075-6 |
MIC2288
Functional Diagram
Micrel, Inc.
VIN
FB
OVP*
EN
OVP*
SW
g m
PWM
Generator
V REF
1.24V
Σ
CA
1.2MHz
Oscillator
Ramp
Generator
GND
* OVP available on MLF TM package option only.
Figure 1. MIC2288 Block Diagram
Functional Description
The MIC2288 is a constant frequency, PWM current mode
boost regulator. The block diagram is shown in Figure 1. The
MIC2288 is composed of an oscillator, slope compensation
ramp generator, current amplifier, g m error amplifier, PWM
generator, and a 1A bipolar output transistor. The oscillator
generates a 1.2MHz clock. The clock’s two functions are to
trigger the PWM generator that turns on the output transistor,
and to reset the slope compensation ramp generator. The
current amplifier is used to measure the switch current by
amplifying the voltage signal from the internal sense resistor.
The output of the current amplifier is summed with the output
of the slope compensation ramp generator. This summed
current-loop signal is fed to one of the inputs of the PWM
generator.
The g m error amplifier measures the feedback voltage through
the external feedback resistors and amplifies the error be-
tween the detected signal and the 1.24V reference voltage.
The output of the g m error amplifier provides the voltage-loop
signal that is fed to the other input of the PWM generator.
When the current-loop signal exceeds the voltage-loop sig-
nal, the PWM generator turns off the bipolar output transistor.
The next clock period initiates the next switching cycle,
maintaining the constant frequency current-mode PWM con-
trol.
M9999-042205
6
April 2005
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