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參數(shù)資料
| 型號(hào)： | MIC2145BMM |
| 廠商： | MICREL INC |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | High Efficiency 2.5W Boost Converter |
| 中文描述： | 2 A SWITCHING REGULATOR, 450 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁(yè)數(shù)： | 7/15頁(yè) |
| 文件大?。?/td> | 219K |
| 代理商： | MIC2145BMM |
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May 2003
7
MIC2145
MIC2145
Functional Description
See
“
Application Information
”
for component selection and
pre-designed circuits.
Overview
The MIC2145 is a 2.5W boost regulator with programmable
peak current limit and a constant off time. Quiescent current
for the MIC2145 is typically 200
μ
A when the switch is in the
off state. Efficiencies above 80% throughout most operating
conditions can be realized.
Regulation
Regulation is achieved by both of the comparators, which
regulate the inductor current and the output voltage by gating
the power MOSFET. Initially, power is applied to the SW and
VDD pins. When the part is enabled, the power MOSFET
turns on and current flows. When the current exceeds the
peak current limit threshold, the current limit comparator fires
the one-shot to turn off the power MOSFET for 1000ns and
resets the SR flip-fop. The current limit comparator continues
to cycle the power MOSFET on and off until the output voltage
terminates the cycle. The cycle will begin again when the
output voltage drops below the lower hysteresis threshold of
the feedback comparator. The feedback comparator has a
typical hysteresis of 18mV. Due to the gain of the feedback
resistor divider, the voltage at V
OUT
experiences a typical
167mV of hysteresis for 10V output at 2.4V V
DD
. This can be
reduced by adding a feed-forward capacitor, C
FF
(See
“
Output Voltage
”
section).
Mcre
Time 20
μ
s
V
OUT
AC Couple
(100mV/div)
V
SW
(5V/div)
I
(500mA/div)
Figure 2. Typical Regulator Waveforms
Output
The maximum output voltage is limited by the voltage capa-
bility of the output switch. Output voltages of up to 16V can be
achieved with the boost circuit. Higher output voltages re-
quire a flyback configuration.
Peak Current Limit
The peak current limit is externally set with a resistor. The
peak current range is from 420mA to 2A. There is a minimum
resistor value for R
SET
at lower V
DD
voltages. For resistor
value selections, see the
“
Typical Characteristics: Peak
Current Limit vs. R
SET
”
.
Soft Start
The MIC2145 has a built in soft start that controls the rise time
of the output voltage and the peak current limit threshold
during start up.
Time 200
μ
s
V
OUT
(5V/div)
V
EN
(2V/div)
V
SW
(5V/div)
I
(500mA/div)
V
V
OUT
= 3V
R
= 10k
C
SS
= 0.01
μ
F
Figure 3. Typical Soft Start Waveforms
Thermal Shutdown
Built-in thermal protection circuitry turns off the power MOSFET
when the junction temperature exceeds about 150
°
C.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2145BMM TR | 功能描述:IC REG BST FLYBK SEPIC ADJ 8MSOP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:20 系列:SIMPLE SWITCHER® 類(lèi)型:降壓（降壓） 輸出類(lèi)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(kāi)關(guān):52kHz 電流 - 輸出:1A 同步整流器:無(wú) 工作溫度:-40°C ~ 125°C 安裝類(lèi)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(chēng):*LM2575HVN-12LM2575HVN-12 |
| MIC2145BMMTR | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| MIC2145YML | 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 MSOP-8 Boost Regulator (Lead Free) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)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 |
| MIC2145YML TR | 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 MSOP-8 Boost Regulator (Lead Free) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)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 |
| MIC2145YML-TR | 功能描述:Boost, Flyback, SEPIC Switching Regulator IC Positive Adjustable 2.4V 1 Output 500mA 10-VFDFN Exposed Pad, 10-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，升壓/降壓 輸出配置:正 拓?fù)?升壓，反激式，SEPIC 輸出類(lèi)型:可調(diào)式 輸出數(shù):1 電壓 - 輸入（最小值）:2.4V 電壓 - 輸入（最大值）:16V 電壓 - 輸出（最小值/固定）:2.4V 電壓 - 輸出（最大值）:16V 電流 - 輸出:500mA 頻率 - 開(kāi)關(guān):450kHz 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C（TA） 安裝類(lèi)型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤(pán)，10-MLF? 供應(yīng)商器件封裝:10-MLF?（3x3） 標(biāo)準(zhǔn)包裝:1 |
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