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參數(shù)資料
| 型號： | EN5311QI |
| 廠商： | ENPIRION INC |
| 元件分類： | 穩(wěn)壓器 |
| 中文描述： | 1 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, QCC20 |
| 封裝： | 5 X 5 MM, 1.10 MM HEIGHT, HAOLGEN FREE AND ROHS COMPLIANT, QFN-20 |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 290K |
| 代理商： | EN5311QI |
03799
11/24/2009
Rev:B
EN5311QI
Enpirion 2009 all rights reserved, E&OE
11
www.enpirion.com
Recommendation 3
: Multiple small vias (0.25mm after copper plating) should be used to connect
ground terminals of the Input capacitor and the output capacitor to the system ground plane. This
provides a low inductance path for the high-frequency AC currents; thereby reducing ripple and
suppressing EMI (see Fig. 6, Fig. 7, and Fig. 8).
Recommendation 4
: The large thermal pad underneath the component must be connected to the
system ground plane through as many thermal vias as possible. The vias should use 0.33mm drill
size with minimum one ounce copper plating (0.035mm plating thickness). This provides the path for
heat dissipation from the converter.
Recommendation 5:
The system ground plane referred to in recommendations 3 and 4 should be
the first layer immediately below the surface layer (PCB layer 2). This ground plane should be
continuous and un-interrupted below the converter and the input and output capacitors that carry
large AC currents.
If it is not possible to make PCB layer 2 a continuous ground plane, an
uninterrupted ground “island” should be created on PCB layer 2 immediately underneath the
EN5311QI and its input and output capacitors. The vias that connect the input and output capacitor
grounds, and the thermal pad to the ground island, should continue through to the PCB GND layer as
well.
Recommendation 6
: As with any switch-mode DC/DC converter, do not run sensitive signal or
control lines underneath the converter package.
Recommendation 7
: The VOUT sense point should be just after the last output filter capacitor next
to the device. Keep the sense trace short in order to avoid noise coupling into the node.
Recommendation 8
: Keep Ra, Ca, and Rb close to the VFB pin (see Figures 4 and 5). The VFB pin is
a high-impedance, sensitive node. Keep the trace to this pin as short as possible. Whenever possible,
connect Rb directly to the GND pin instead of going through the GND plane.
Figure 6 shows an example schematic for the EN5311QI using the internal voltage select. In this
example, the device is set to a VOUT of 1.5V (VS2=0, VS1=1, VS0=1).
Figure 7 shows an example schematic using an external voltage divider. VS0=VS1=VS2= “1”. The
resistor values are chosen to give an output voltage of 2.6V.
Figure 6. Example application, Vout=1.5V.
Figure 7. Example Application, external divider, Vout = 2.6V.
Figure 8 shows an example board layout. The left side of the figure demonstrates construction of the
PCB top layer. Note the placement of the vias from the input and output filter capacitor grounds, and
V
OU
T
NC
V
OUT
V
FB
V
SE
N
SE
NC
V
OU
T
GN
D
GN
D
V
IN
ENABLE
VS0
VS1
VS2
1
2
6
5
4
3
10
9
8
7
11
12
13
14
15
16
20
19
18
17
V
IN
4.7uF
10
μF
V
IN
V
OUT
(see layout recommendation 3)
V
OU
T
NC
V
OUT
V
FB
V
SE
NSE
NC
V
OU
T
GN
D
GN
D
V
IN
ENABLE
VS0
VS1
VS2
1
2
6
5
4
3
10
9
8
7
11
12
13
14
15
16
20
19
18
17
V
IN
4.7uF
10
μF
V
IN
V
OUT
Ra=200K
Rb=60K
(see layout recommendation 3)
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| EN5311QI-E | 功能描述:電源管理IC開發(fā)工具 Eval Board EN5311QI 1A Sync. Buck Convtr 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 |
| EN5312Q | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Fully Integrated Voltage Mode Synchronous Buck PWM DC-DC Converter Module |
| EN5312QI | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1A Sync Buck Reg w/ Integrated Inductor RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| EN5312QI-E | 功能描述:電源管理IC開發(fā)工具 1A Synchronous Buck Regulator 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 |
| EN5312QI-T | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1A Sync Buck Reg RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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