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参数资料
| 型号： | LT3494EDDB#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.25 A SWITCHING REGULATOR, PDSO8 |
| 封装： | 3 X 2 MM, LEAD FREE, PLASTIC, MO-229WECD-1, DFN-8 |
| 文件页数： | 2/12页 |
| 文件大小： | 261K |
| 代理商： | LT3494EDDB#PBF |
LT3494/LT3494A
10
3494fb
TYPICAL APPLICATIONS
Figure 5. One Li-Ion Cell Input Boost Converter with the LT3494
APPLICATIONS INFORMATION
the CAP pin will improve efciency and lower the stress
placed on the internal Schottky diode.
Board Layout Considerations
As with all switching regulators, careful attention must be
paid to the PCB board layout and component placement.
To maximize efciency, switch rise and fall times are made
as short as possible. To prevent electromagnetic interfer-
ence (EMI) problems, proper layout of the high frequency
switching path is essential. The voltage signal of the SW pin
has sharp rising and falling edges. Minimize the length and
area of all traces connected to the SW pin and always use
a ground plane under the switching regulator to minimize
interplane coupling. In addition, the FB connection for
the feedback resistor R1 should be tied directly from the
Vout pin to the FB pin and be kept as short as possible,
ensuring a clean, noise-free connection. Recommended
component placement is shown in Figure 4.
SW
GND
VCC
CTRL
CAP
VOUT
FB
SHDN
GND
CTRL
VIAS TO GROUND PLANE REQUIRED
TO IMPROVE THERMAL PERFORMANCE
SHDN
3494 F04
Figure 4. Recommended Layout
SW
CAP
VCC
SHDN
CTRL
7
6
2
3
5
4
VOUT
FB
GND
TURN ON/OFF
VOUT DIMMING
R1
3494 F05
LT3494
C2
4.7
μF
L1
15
μH
C1
0.22
μF
C3
2.2
μF
C1, C2: X5R OR X7R WITH SUFFICIENT VOLTAGE RATING
C3: MURATA GRM31MR71E225K
L1: MURATA LQH32CN150K53
8
1
VIN
3V TO 4.2V
VOUT
LOAD CURRENT (mA)
0.1
60
EFFICIENCY
(%)
POWER
LOSS
(mW)
70
80
90
1
10
100
3494 TA01c
50
40
30
20
160
200
240
280
120
80
40
0
VIN = 3.6V
LOAD FROM
CAPACITOR
LOAD FROM
VOUT
3.6V to 16V Efciency
VOUT
R1 VALUE REQUIRED
(M
Ω)
MAXIMUM OUTPUT CURRENT AT
3V INPUT (mA)
25
3.57
8.6
24
3.40
9.3
23
3.24
10.0
22
3.09
10.6
21
2.94
11.3
20
2.80
12.1
19
2.67
12.9
18
2.49
13.6
17
2.37
14.8
16
2.21
16.0
15
2.05
17.2
相关PDF资料 |
PDF描述 |
|---|---|
| LT3494EDDB | 0.25 A SWITCHING REGULATOR, PDSO8 |
| LT3502AEDC#PBF | 1.1 A SWITCHING REGULATOR, 2800 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT3502AIDC#PBF | 1.1 A SWITCHING REGULATOR, 2800 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT3502AIDC#TR | 1.1 A SWITCHING REGULATOR, 2800 kHz SWITCHING FREQ-MAX, PDSO10 |
| LT3502AEDC#TRM | 1.1 A SWITCHING REGULATOR, 2800 kHz SWITCHING FREQ-MAX, PDSO10 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3494EDDBTRMPBF | 制造商:Linear Technology 功能描述:Boost Converter uPower Low Noise DFN8EP |
| LT3495 | 制造商:LINER 制造商全称:Linear Technology 功能描述:650mA/350mA Micropower Low Noise Boost Converter with Output Disconnect |
| LT3495-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:650mA/350mA Micropower Low Noise Boost Converter with Output Disconnect |
| LT3495B | 制造商:LINER 制造商全称:Linear Technology 功能描述:650mA/350mA Micropower Low Noise Boost Converter with Output Disconnect |
| LT3495B-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:650mA/350mA Micropower Low Noise Boost Converter with Output Disconnect |
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