- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384733 > MIC2142BM5 (MICREL INC) Micropower Boost Converter PDF資料下載
參數(shù)資料
| 型號： | MIC2142BM5 |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Micropower Boost Converter |
| 中文描述： | SWITCHING REGULATOR, 365 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 6/17頁 |
| 文件大?。?/td> | 137K |
| 代理商： | MIC2142BM5 |
MIC2142
Functional Diagram
Micrel
MIC2142
6
December 2000
Functional Description
This MIC2142 is a fixed duty cycle, constant frequency, gated
oscillator, micropower, switch-mode power supply controller.
Quiescent current for the MIC2142 is only 85
μ
A in the switch
off state, and since a MOSFET output switch is used, addi-
tional switch drive current is minimized. Efficiencies above
85% throughout most operating conditions can be realized.
A functional block diagram is shown above and typical
schematic is shown on page 1. Regulation is performed by a
hysteretic comparator, which regulates the output voltage by
gating the internal oscillator. The internal oscillator operates
at a fixed 57% duty cycle and 330kHz frequency. For the fixed
output versions, the output is divided down internally and then
compared to the internal V
REF
input. An external resistive
divider is use for the adjustable version.
The comparator has hysteresis built into it, which determines
the amount of low frequency ripple that will be present on the
FIXED DUTY CYCLE
FB
EN
VCC
GND
SW
Oscillator
MIC2142
Bandgap
Reference
Shutdown
output. Once the feedback input to the comparator exceeds
the control voltage by 18mV, the high frequency oscillator
drive is removed from the output switch. As the feedback
input to the comparator returns to the reference voltage level,
the comparator is reset and the high frequency oscillator is
again gated to the output switch. The 18mV of hysteresis
seen at the comparator will be multiplied by the ratio of the
output voltage to the reference voltage. For a five volt output
this ratio would be 4, corresponding to a ripple voltage of
72mV at the output.
The maximum output voltage is limited by the voltage capa-
bility of the output switch. Output voltages up to 22V can be
achieved with a standard boost circuit. Higher output volt-
ages can be realized with a flyback configuration.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC2145 | High Efficiency 2.5W Boost Converter |
| MIC2145BML | High Efficiency 2.5W Boost Converter |
| MIC2145BMM | High Efficiency 2.5W Boost Converter |
| MIC2169MM | 500 KHZ PWM SYNCHRONOUS BUCK CONTROL IC |
| MIC2169 | 500 KHZ PWM SYNCHRONOUS BUCK CONTROL IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2142BM5 EV | 制造商:Micrel Inc 功能描述: |
| MIC2142BM5 TR | 功能描述:IC REG BOOST FLYBK SEPIC SOT23-5 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(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 |
| MIC2142BM5TR | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| MIC2142YM5 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Micrel Inc 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC2142YM5 TR | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Micropower SOT23-5 Boost Converter (Lead Free) RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。