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| 型号： | MIC4682BM |
| 厂商： | Micrel Inc |
| 文件页数： | 9/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 2A 8SOIC |
| 标准包装： | 95 |
| 系列： | SuperSwitcher™ |
| 类型： | 降压（降压） |
| 输出数： | 1 |
| 输入电压： | 4 V ~ 34 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 200kHz |
| 电流 - 输出： | 2A |
| 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-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
Micrel, Inc.
Functional Diagram
V IN
MIC4682
= V
V OUT FB ?
+ 1 ?
IN
? R1
? R2
?
?
SHDN
Internal
V FB = 1.23V
R1 = R2 ? OUT ? 1 ?
ISET
200kHz
Regulator
Thermal
Current
? V ?
? V FB ?
– 1 ?
Oscillator
Shutdown
Limit
R2 =
R1
? V OUT
?
? V FB
?
?
Com-
parator
SW
V OUT
Reset
Driver
2A
Switch
C OUT
R1
FB
Error
Amp
1.23V
Bandgap
R2
Reference
MIC4682
GND
Figure 1. MIC4682 Block Diagram
Functional Description
The MIC4862 is a constant frequency, voltage mode-
switching regulator. Referring to the block diagram,
regulation is achieved when the feedback voltage is
equal to the band gap reference. The FB pin senses the
output voltage and feeds into the input of the Error Amp.
The output of the Error Amp produces a positive voltage
to compare with the 200kHz saw-tooth waveform. These
two signals are fed into the comparator to generate the
Pulse Width Modulation (PWM) signal to turn on and off
the internal switch. The duty cycle is defined as the time
the switch turns on divided by the period of the saw-
tooth oscillator. Initially, when power is applied to the IN
pin, the duty cycle is high because the feedback is close
to ground. As the output and feedback voltage start to
rise, the duty cycle decreases.
During the on time, current flows through the switch and
into the inductor until it reaches the peak current limit or
the maximum duty cycle which turns the switch off. The
external resistor at the ISET pin sets the peak current
limit. The maximum duty cycle is controlled by the Reset
circuitry. At this time, energy is stored in the inductor.
The current charges the output capacitor and supplies to
the load. The Schottky diode is reversed bias.
When the internal switch is off, the stored energy in the
inductor starts to collapse. The voltage across the
inductor reverses polarity and the inductor current starts
to decrease. The Schottky diode clamps the switch
voltage from going too negative and provides the path
for the inductor current. During the off time, the inductor
and the output capacitor provide current to the load.
An internal regulator provides power to the control
circuitry and the thermal protection circuitry turns off the
internal switch when the junction temperature exceeds
about 160°C.
June 2007
9
M9999-061507
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC4682BM TR | 功能描述:IC REG BUCK 2A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:SuperSwitcher™ 标准包装:20 系列:SIMPLE SWITCHER® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12 |
| MIC4682YM | 功能描述:直流/直流开关调节器 Precision Current Limit SO-8 Super Switcher (Lead Free) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC4682YM TR | 功能描述:直流/直流开关调节器 Precision Current Limit SO-8 Super Switcher (Lead Free) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC4684 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:2A High-Efficiency SuperSwitcher Buck Regulator |
| MIC4684_10 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:2A High-Efficiency SuperSwitcher Buck Regulator |
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