参数资料
型号: MIC2296BML TR
厂商: Micrel Inc
文件页数: 6/12页
文件大小: 0K
描述: IC REG BOOST ADJ 1.2A 8MLF
标准包装: 5,000
类型: 升压(升压)
输出类型: 可调式
输出数: 1
输出电压: 最高 34V
输入电压: 2.5 V ~ 10 V
PWM 型: 电流模式
频率 - 开关: 600kHz
电流 - 输出: 1.2A
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-VFDFN 裸露焊盘,8-MLF?
包装: 带卷 (TR)
供应商设备封装: 8-MLF?(2x2)
其它名称: MIC2296BMLTR
MIC2296BMLTR-ND
Micrel
Functional Description
The MIC2296 is a high power density, PWM dc/dc boost
regulator. The block diagram is shown in Figure 1. The
MIC2296 is composed of an oscillator, slope
compensation ramp generator, current amplifier, gm error
amplifier, PWM generator, and a 1.2A bipolar output
transistor. The oscillator generates a 600kHz 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
MIC2296
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 between 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 signal, the PWM generator turns off the
bipolar output transistor. The next clock period initiates the
next switching cycle, maintaining constant frequency
current-mode PWM control
VIN
FB
OVP*
EN
MIC2296
OVP*
SW
V REF
1.24V
g m
PWM
Generator
CA
600kHz
Oscillator
Ramp
Generator
GND
* OVP available on MLF TM package option only.
Figure 1. MIC2296 Block Diagram
January 2010
6
M9999-011310
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相关代理商/技术参数
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