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參數(shù)資料
| 型號： | MIC2204YMM |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High-Efficiency 2MHz Synchronous Buck Converter |
| 中文描述： | 2 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | LEAD FREE, MSOP-10 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 112K |
| 代理商： | MIC2204YMM |
MIC2204
Applications Information
Input Capacitor
A minimum 1
μ
F ceramic is recommended on the VIN pin for
bypassing. X5R or X7R dielectrics are recommended for the
input capacitor. Y5V dielectrics are not recommended: they
lose most of their capacitance over temperature and also
become resistive at high frequencies. This reduces their
ability to filter out high frequency noise.
Output Capacitor
The MIC2204 was designed specifically for the use of a 4.7
μ
F
ceramic output capacitor. The output capacitor requires
either an X7R or X5R dielectric. Y5V and Z5U dielectric
capacitors, aside from the undesirable effect of their wide
variation in capacitance over temperature, become resistive
at high frequencies. Using Y5V or Z5U capacitors will cause
instability in the MIC2204. For output voltages less than 1.6V,
a 10
μ
F capacitor may be required for stability. See the
“
Compensation
”
section for more detail.
Total output capacitance should not exceed 15
μ
F. Large
values of capacitance can cause current limit to engage
during start-up. If larger than 15
μ
F is required, a feed-forward
capacitor from the output to the feedback node should be
used to slow the start-up time.
Inductor Selection
Inductor selection will be determined by the following (not
necessarily in the order of importance):
Inductance
Rated current value
Size requirements
DC resistance (DCR)
The MIC2204 is designed for use with a 4.7
μ
H inductor.
Maximum current ratings of the inductor are generally given
in two methods: permissible DC current and saturation cur-
rent. Permissible DC current can be rated either for a 40
°
C
temperature rise or a 10% loss in inductance. Ensure the
inductor selected can handle the maximum operating cur-
rent. When saturation current is specified, make sure that
there is enough margin that the peak current will not saturate
the inductor.
Micrel
M0214-012904
8
January 2004
The size requirements refer to the area and height require-
ments that are necessary to fit a particular design. Please
refer to the inductor dimensions on their data sheet.
DC resistance is also important. While DCR is inversely
proportional to size, DCR can represent a significant effi-
ciency loss. Refer to the
“
Efficiency Considerations
”
below
for a more detailed description.
Table 1 below shows a list of recommended 4.7
μ
H inductors
by manufacturer, part number and key specifications.
Bias Capacitor
A small 10nF ceramic capacitor is required to bypass the
BIAS pin. The use of low ESR ceramics provides improved
filtering for the bias supply.
Efficiency Considerations
Efficiency is defined as the amount of useful output power,
divided by the amount of power consumed.
Efficiency %
V
I
I
V
100
OUT
OUT
IN
IN
=
×
×
×
Maintaining high-efficiency serves two purposes. It reduces
power dissipation in the power supply, reducing the need for
heat sinks and thermal design considerations and it reduces
consumption of current for battery powered applications.
Reduced current draw from a battery increases the devices
operating time, critical in handheld devices.
There are two loss terms in switching converters: DC losses
and switching losses. DC losses are simply the power dissi-
pation of I
2
R. For example, power is dissipated in the high-
side switch during the on cycle, where power loss is equal to
the high-side MOSFET R
DSON
multiplied by the Switch
Current
2
. During the off cycle, the low-side N-Channel
MOSFET conducts, also dissipating power. Device operating
current also reduces efficiency. The product of the quiescent
(operating) current and the supply voltage is another DC loss.
The current required to drive the gates on and off at a constant
2MHz frequency and the switching transitions make up the
switching losses.
Manufacturer
P/N
H(mm)
W(mm)
L(mm)
DCR(m
)
Sumida
CDRH2D18-4R7
2
3.2
3.2
81
Murata
LQH43CN4R7M01
2.6
3.2
4.6
150
Murata
LQH32CN4R7M11
2.2
2.7
3.4
195
Coilcraft
1008PS-472M
2.74
3.8
3.8
350
Low Profile
TDK
LDR5610T-4R7MR90
1
5.2
5.8
240
Sumida
CMD4D06
0.8
6.3
5.8
216
Table 1. Component Selection Table
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|---|---|
| MIC2204YMM TR | 功能描述:直流/直流開關調(diào)節(jié)器 2MHz Synchronous Buck Regulator (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 |
| MIC2204YMM-TR | 功能描述:Buck Switching Regulator IC Positive Adjustable 1V 1 Output 600mA 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):停產(chǎn) 功能:降壓 輸出配置:正 拓撲:降壓 輸出類型:可調(diào)式 輸出數(shù):1 電壓 - 輸入（最小值）:2.3V 電壓 - 輸入（最大值）:5.5V 電壓 - 輸出（最小值/固定）:1V 電壓 - 輸出（最大值）:5.5V 電流 - 輸出:600mA 頻率 - 開關:2MHz 同步整流器:是 工作溫度:-40°C ~ 125°C （TJ） 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應商器件封裝:10-MSOP 標準包裝:1 |
| MIC2205 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:2MHz PWM Synchronous Buck Regulator with LDO Standby Mode |
| MIC2205_06 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:2MHz PWM Synchronous Buck Regulator with LDO Standby Mode |
| MIC2205-1.38YML | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:2MHz PWM Synchronous Buck Regulator with LDO Standby Mode |
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