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參數(shù)資料
| 型號： | LM2736 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Thin SOT23 750mA Load Step-Down DC-DC Regulator |
| 中文描述： | 薄型SOT23負載電流降壓型DC - DC穩(wěn)壓器 |
| 文件頁數(shù)： | 11/22頁 |
| 文件大小： | 444K |
| 代理商： | LM2736 |
Design Guide
(Continued)
OUTPUT VOLTAGE
The output voltage is set using the following equation where
R2 is connected between the FB pin and GND, and R1 is
connected between V
O
and the FB pin. A good value for R2
is 10k
.
PCB Layout Considerations
When planning layout there are a few things to consider
when trying to achieve a clean, regulated output. The most
important consideration when completing the layout is the
close coupling of the GND connections of the C
capacitor
and the catch diode D1. These ground ends should be close
to one another and be connected to the GND plane with at
least two through-holes. Place these components as close to
the IC as possible. Next in importance is the location of the
GND connection of the C
capacitor, which should be
near the GND connections of C
IN
and D1.
There should be a continuous ground plane on the bottom
layer of a two-layer board except under the switching node
island.
The FB pin is a high impedance node and care should be
taken to make the FB trace short to avoid noise pickup and
inaccurate regulation. The feedback resistors should be
placed as close as possible to the IC, with the GND of R2
placed as close as possible to the GND of the IC. The V
OUT
trace to R1 should be routed away from the inductor and any
other traces that are switching.
High AC currents flow through the V
IN
, SW and V
OUT
traces,
so they should be as short and wide as possible. However,
making the traces wide increases radiated noise, so the
designer must make this trade-off. Radiated noise can be
decreased by choosing a shielded inductor.
The remaining components should also be placed as close
as possible to the IC. Please see Application Note AN-1229
for further considerations and the LM2736 demo board as an
example of a four-layer layout.
L
www.national.com
11
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM2736X | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LM2736 Thin SOT 750mA Load Step-Down DC-DC Regulator |
| LM2736X EVAL | 功能描述:BOARD EVALUATION LM2736X RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓撲結(jié)構(gòu):升壓 頻率 - 開關:3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| LM2736X EVAL/NOPB | 功能描述:電源管理IC開發(fā)工具 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM2736XEVAL | 功能描述:電源管理IC開發(fā)工具 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM2736XEVAL/NOPB | 功能描述:電源管理IC開發(fā)工具 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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