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參數(shù)資料
| 型號： | MIC4682BM |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | PRECISION CURRENT LIMIT SO-8 SUPERSWITCHER BUCK REGULATOR |
| 中文描述： | 1.1 A SWITCHING REGULATOR, 220 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大小： | 226K |
| 代理商： | MIC4682BM |
October 2003
9
M0334-102203
MIC4682
Block Diagram
Micrel
SW
FB
R1
R2
C
OUT
V
IN
IN
V
OUT
MIC4682
Internal
Regulator
SHDN
ISET
200kHz
Oscillator
Thermal
Shutdown
Reset
Current
Limit
Com-
parator
Error
Amp
2A
Switch
Driver
1.23V
Bandgap
Reference
GND
V
V
R1
R2
1
V
1.23V
R1 R2
V
V
1
R2
R1
V
V
–1
OUT
FB
FB
OUT
FB
OUT
FB
=
+
=
=
Figure 1. MIC4682 Block Diagram
Functional Description
The MIC4862 is a constant frequency, voltage mode-switch-
ing 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 compara-
tor 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.
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| MIC4682BM TR | 功能描述:IC REG BUCK 2A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:SuperSwitcher™ 標準包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關:52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應商設備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| MIC4682YM | 功能描述:直流/直流開關調節(jié)器 Precision Current Limit SO-8 Super Switcher (Lead Free) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MIC4682YM TR | 功能描述:直流/直流開關調節(jié)器 Precision Current Limit SO-8 Super Switcher (Lead Free) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MIC4684 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:2A High-Efficiency SuperSwitcher Buck Regulator |
| MIC4684_10 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:2A High-Efficiency SuperSwitcher Buck Regulator |
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