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參數(shù)資料
| 型號(hào)： | LM2852XMXAX-2.5 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2MX16 RD/WHILE/WRIT FLASH48PTSOP BB (TRAY) AMD AM29DL322DB70EI |
| 中文描述： | 4.95 A SWITCHING REGULATOR, 1825 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | TSSOP-14 |
| 文件頁數(shù)： | 11/13頁 |
| 文件大小： | 618K |
| 代理商： | LM2852XMXAX-2.5 |
Applications Information
(Continued)
SPLIT-RAIL OPERATION
The LM2852 can be powered using two separate voltages
for AVIN and PVIN. AVIN is the supply for the control logic;
PVIN is the supply for the power FETs. The output filter
components need to be chosen based on the value of PVIN.
For PVIN levels lower than 3.3V, use output filter component
values recommended for 3.3V. PVIN must always be equal
to or less than AVIN.
20127014
Layout Hints
These are several guidelines to follow while designing the
PCB layout for an LM2852 application.
1.
The input bulk capacitor, C
, should be placed very
close to the PVIN pin to keep the resistance as low as
possible between the capacitor and the pin. High current
levels will be present in this connection.
2.
All ground connections must be tied together. Use a
broad ground plane, for example a completely filled back
plane, to establish the lowest resistance possible be-
tween all ground connections.
3.
The sense pin connection should be made as close to
the load as possible so that the voltage at the load is the
expected regulated value. The sense line should not run
too close to nodes with high EMI (such as the switch
LM2852Y Example Circuit Schematic (500kHz)
node) to minimize interference.
The switch node connections should be low resistance
to reduce power losses. Low resistance means the trace
between the switch pin and the inductor should be wide.
However, the area of the switch node should not be too
large since EMI increases with greater area. So connect
the inductor to the switch pin with a short, but wide trace.
Other high current connections in the application such
as PVIN and V
assume the same trade off between
low resistance and EMI.
Allow area under the chip to solder the entire exposed
die attach pad to ground. Lab measurements show im-
proved regulation performance when the exposed pad is
well grounded.
4.
5.
Bill of Materials for 3.3V
IN
to 1.8 V
OUT
Conversion
ID
U
1
L
O
C
O
*
C
IN
C
INX
C
SS
R
f
C
f
* If a “non-tantalum” solution is desired use an NOSC107M004R0150, 100 μF capacitor from AVX for C
O
.
Part Number
Type
2A Buck
Inductor
Capacitor
Capacitor
Capacitor
Capacitor
Resistor
Capacitor
Size
Parameters
Qty
1
1
1
1
1
1
1
1
Vendor
NSC
Coilcraft
Vishay-Sprague
Murata
Murata
Vishay-Vitramon
Vishay-Dale
Murata
LM2852YMXA-1.8
DO3316P-153
595D107X_6R3C2T
GRM32ER60J476ME20B
GRM21BR71C105KA01B
VJ0805Y272KXXA
CRCW060310R0F
GRM21BR71C105KA01B
ETSSOP-14
15 μH
Case Code “C”
1210
0805
0805
0603
0805
100 μF
±
20%
47μF/X5R/6.3V
1μF/X7R/16V
2.7nF
±
10%
10
±
10%
1μF/X7R/16V
20127020
FIGURE 1.
L
www.national.com
11
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| LM2852XMXAX-3.0 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 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(fēng)格:SMD/SMT |
| LM2852XMXAX-3.0/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 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(fēng)格:SMD/SMT |
| LM2852XMXAX-3.3 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 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(fēng)格:SMD/SMT |
| LM2852XMXAX-3.3/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 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(fēng)格:SMD/SMT |
| LM2852Y-1.2EVAL | 功能描述:電源管理IC開發(fā)工具 LM2852Y-1.2 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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