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參數(shù)資料
| 型號(hào)： | MIC5191BMM TR |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 11/15頁 |
| 文件大小： | 845K |
| 描述： | IC REG CTRLR SGL POS ADJ 10-MSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 正，可調(diào)式 |
| 輸出數(shù)： | 1 |
| 輸出電壓： | 可調(diào) |
| 電流 - 電源： | 15mA |
| 輸入電壓： | 1 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-MSOP |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | MIC5191BMMTR MIC5191BMMTR-ND |
Micrel, Inc.
MIC5191
December 2006
11
M9999-122206
Referring to Application Hint 17, Designing PCB Heat
Sinks, the minimum amount of copper area for a D
2
pack
at 28.8癈/W is 2750mm
2
(or 0.426in
2
). The solid line
denotes convection heating only (2 oz. copper) and the
dotted line shows thermal resistance with 250LFM air-
flow. The copper area can be significantly reduced by
increasing airflow or by adding external heat sinks.
Figure 8. PC Board Heat Sink
Another important characteristic is the amount of gate
capacitance. Large gate capacitance can reduce
transient performance by reducing the ability of the
MIC5190 to slew the gate. It is recommended that the
MOSFET used has an input capacitance <10nF (C
ISS
).
Source threshold specified in most MOSFET data sheets
refers to the minimum voltage needed to fully enhance
the MOSFET. Although for the most part, the MOSFET
will be operating in the linear region and the V
GS
(gate-
source voltage) will be less than the fully enhanced V
GS
,
it is recommended the VCC voltage has 2V over the
minimum V
GS
and output voltage. This is due to the
saturation voltage of the MIC5191 output driver.
V
CC1, 2
e 2V + V
GS
+ V
OUT
For our example, with a 1.5V output voltage, our
MOSFET is fully enhanced at 4.5V
GS
, our V
CC
voltage
should be greater or equal to 8V.
Input Capacitor
Good input bypassing is important for improved perfor-
mance. Low ESR and low ESL input capacitors reduce
both the drain of the N-Channel MOSFET, as well as the
source impedance to the MIC5191. When a load
transient on the output occurs, the load step will also
appear on the input. Deviations on the input voltage will
be reduced by the MIC5191s PSRR, but nonetheless
appear on the output. There is no minimum input
capacitance, but for optimal performance it is
recommended that the input capacitance be equal to or
greater than the output capacitance.
Output Capacitor
The MIC5191 is stable with any type or value of output
capacitor (even without any output capacitor!). This
allows the output capacitor to select which parameters of
the regulator are important. In cases where transient
response is the most important, low ESR and low ESL
ceramic capacitors are recommended. Also, the more
capacitance on the output, the better the transient
response.
4
5
3
1
2
VIN
EN/UVLO
CSH
VOUT
FB
LSD
560pF
8.06k
BST
COMP
6
HSD
12
VSW
11
GND
D1
SD103BWS
2.2礔
10V
0.1礔
10
8
VDD
7
U1 MIC2198-BML
9
100pF
11.5k
100k
V
OUT
V
OUT
CSH
J2
EN
J1
+V
IN
V
IN
CSH
V
OUT
10k
10k
1礔
25V
330礔
16V
10礔
10礔
10礔
10礔
10礔
22礔
1V
OUT
@10A
D2
1N5819HW
IRF7821
IRF7821
L1
1.8礖
CDEP134-1R8MC-H
12.4k
330礔
Tantalum
OUT
VCC1
VCC2
VIN
FB
ISENSE
COMP
GND
10nF
MIC5191
1礔
V
OUT
12V
Figure 9. Post Regulator
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| MIC5191YML | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Ultra High-Speed, High-Current Active Filter / LDO Controller |
| MIC5191YML TR | 功能描述:低壓差控制器 - LDO Ultra Hi-Speed Hi-Current Active Filter/LDO Controller(Lead Free) RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負(fù)載調(diào)節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
| MIC5191YML-TR | 功能描述:Linear Regulator Controller IC Positive Adjustable 1 Output 10-MLF? (3x3) 制造商:microchip technology 系列:- 包裝:* 零件狀態(tài):停產(chǎn) 類型:正，可調(diào)式 輸出數(shù):1 電流 - 電源:15mA 電壓 - 輸入:1 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 封裝/外殼:10-VFDFN 裸露焊盤，10-MLF? 供應(yīng)商器件封裝:10-MLF?（3x3） 標(biāo)準(zhǔn)包裝:1 |
| MIC5191YMM | 功能描述:低壓差控制器 - LDO Ultra Hi-Speed Hi-Current Active Filter/LDO Controller(Lead Free) RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負(fù)載調(diào)節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
| MIC5191YMM TR | 功能描述:低壓差控制器 - LDO Ultra Hi-Speed Hi-Current Active Filter/LDO Controller(Lead Free) RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負(fù)載調(diào)節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
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