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參數(shù)資料
| 型號： | MIC2807 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | RF PA Power Management IC 2MHz, 600mA DC/DC w/DAC Input and Bypass Switch, Dual Low Noise 200mA/30mA LDO Regulators |
| 中文描述： | 射頻功率放大器電源管理IC，600mA的直流/直流瓦特2MHz的/ DAC輸入和旁路開關(guān)，雙低噪聲200mA/30mA LDO穩(wěn)壓器 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大?。?/td> | 442K |
| 代理商： | MIC2807 |
Micrel, Inc.
MIC2807
Component Selection
Output Capacitor
LDO1 output requires a 2.2μF ceramic capacitor, while
the LDO2 and DC/DC regulator outputs require a 1μF
ceramic capacitor. All output capacitor values can be
increased to improve transient response, but perform-
ance has been optimized for a 2.2μF ceramic capacitor
for LDO1 and 1μF ceramic capacitors for both the
DC/DC regulator and LDO2. X7R/X5R dielectric-type
ceramic capacitors are recommended because of their
temperature performance. X5R/X7R-type capacitors
change capacitance by 15% over their operating
temperature range and are the most stable type of
ceramic capacitors. Z5U and Y5V dielectric capacitors
change value by as much as 50% to 60% respectively
over their operating temperature ranges.
January 2007
13
M9999-013007-A
Input Capacitor
For optimal bypassing a minimum 1μF ceramic, 2.2μF
recommended, should be placed as close as possible to
the VIN pin. X5R or X7R dielectrics are recommended
for the input capacitor. Y5V dielectrics lose most of their
capacitance over temperature and are therefore, not
recommended. For high frequency filtering a minimum
1μF is recommended close to the VIN and PGND pins.
Smaller case size capacitors are recommended due to
their lower ESR and ESL. Please refer to the PCB layout
section for an example of an appropriate circuit layout.
Inductor Selection
The MIC2807 is designed for use with a 4.7μH inductor.
Proper selection should ensure that the inductor can
handle the maximum average and peak currents
required by the load. Maximum current ratings of the
inductor are generally given in two methods; permissible
DC current and saturation current. Permissible DC
current can be rated either for a 40°C temperature rise
or a 10% to 20% loss in inductance. Ensure that the
inductor selected can handle the maximum operating
current. When saturation current is specified, make sure
that there is enough margin, so that the peak current will
not saturate the inductor. Peak inductor current can be
calculated as follows:
L
f
2
V
V
1
V
I
I
IN
OUT
OUT
OUT
PK
×
×
+
=
I
PK
:
I
OUT
:
V
IN
:
V
OUT
:
f:
L:
Peak Inductor Current
Output/Load Current
Input Voltage
Output Voltage
Switching Frequency of PWM Regulator
Inductor Value
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC280-7BM6 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC280-7BM6 TR | 功能描述:IC SUPERVISOR THERMAL SOT23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:IttyBitty® 標(biāo)準(zhǔn)包裝:2,500 系列:SilentSense™ 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)溫度:-55°C ~ 125°C，外部傳感器 精確度:±2°C 本地（最大），±3°C 遠(yuǎn)程（最大） 拓?fù)?ADC（三角積分型），比較器，寄存器庫 輸出類型:I²C?/SMBus? 輸出警報:是 輸出風(fēng)扇:是 電源電壓:2.7 V ~ 5.5 V 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MSOP 包裝:帶卷 (TR) 其它名稱:MIC284-2BMMTRMIC284-2BMMTR-ND |
| MIC280-7BM6TS | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC2807-JJYML TR | 功能描述:PMIC 解決方案 PAM Power Management IC: DAC controlled DC-DC + 2 LDOs RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| MIC2807-MMYML | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: 制造商:Micrel Inc 功能描述: |
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