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參數(shù)資料
| 型號(hào)： | MIC2290BML |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Replaced by PTH05060W : |
| 中文描述： | 2 A SWITCHING REGULATOR, 1350 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 2 X 2 MM, MLF-8 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 98K |
| 代理商： | MIC2290BML |
August 2004
7
M9999-081104
MIC2290
Functional Diagram
Micrel
Functional Description
The MIC2290 is a constant frequency, PWM current mode
boost regulator. The block diagram is shown in Figure 1. The
MIC2290 is composed of an oscillator, slope compensation
ramp generator, current amplifier, g
m
error amplifier, PWM
generator, and a 0.5A 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.
GND
CA
V
REF
PWM
Generator
Ramp
Generator
1.2MHz
Oscillator
SW
EN
FB
OUT
VIN
1.24V
g
m
OVP
Σ
Figure 1. MIC2290 Block Diagram
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.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2290BML TR | 功能描述:IC REG BOOST ADJ 0.5A 8MLF RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)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(guān):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(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| MIC2290YML | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:2mm 】 2mm PWM Boost Regulator with Internal Schotty Diode |
| MIC2290YML TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.2MHz PWM Boost w/Internal Schottky (Lead Free) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MIC2290YMLTR | 制造商:Micrel 功能描述:Conv DC-DC Single Step Up 2.5V to 10V |
| MIC2290YML-TR | 功能描述:Boost Switching Regulator IC Positive Adjustable 2.5V 1 Output 750mA (Switch) 8-VFDFN Exposed Pad, 8-MLF? 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 功能:升壓 輸出配置:正 拓?fù)?升壓 輸出類型:可調(diào)式 輸出數(shù):1 電壓 - 輸入（最小值）:2.5V 電壓 - 輸入（最大值）:10V 電壓 - 輸出（最小值/固定）:2.5V 電壓 - 輸出（最大值）:34V（開關(guān)） 電流 - 輸出:750mA（開關(guān)） 頻率 - 開關(guān):1.2MHz 同步整流器:無 工作溫度:-40°C ~ 125°C （TJ） 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤，8-MLF? 供應(yīng)商器件封裝:8-MLF?（2x2） 標(biāo)準(zhǔn)包裝:1 |
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