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参数资料
| 型号： | LTC3450EUD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC CONV PS TRIPLE TFT/LCD 16QFN |
| 标准包装： | 2,500 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 1.5 V ~ 4.6 V |
| 输出数： | 3 |
| 输出电压： | 5.1V，-5V，±10V，±15V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 包装： | 带卷 (TR) |
LTC3450
APPLICATIO S I FOR ATIO
Inductor Selection
Inductors in the range of 47 μ H to 100 μ H with saturation
current (I SAT ) ratings of at least 150mA are recommended
for use with the LTC3450. Ferrite core materials are
strongly recommended for their superior high frequency
performance characteristics. A bobbin or toroid type core
will reduce radiated noise. Inductors meeting these re-
quirements are listed in Table 1.
Table 1. Recommended Inductors
Soft-Start
Soft-start operation provides a gradual increase in the
current drawn from the input power source (usually a
battery) during initial startup of the LTC3450, eliminating
the inrush current which is typical in most boost convert-
ers. This reduces stress on the input power source, boost
inductor and output capacitor, reduces voltage sag on the
battery and increases battery life. The rate at which the
input current will increase is set by two external compo-
PART
NUMBER
L MAX DCR HEIGHT
( μ H) ( ? ) (mm) VENDOR
nents (R SS and C SS ) connected to SHDN (refer to Figure
2). Upon initial application of power or release of a pull
CLQ4D10-470
CLQ4D10-101
CMD4D08-470
DO1606-473
DO1606-104
DT1608-473
DT1608-104
47
100
47
47
100
47
100
1.28
3.15
1.6
1.1
2.3
0.34
1.1
1.2
1.0
2.0
2.92
Sumida
(847) 956-0666
www.sumida.com
Coilcraft
(847) 639-6400
www.coilcraft.com
down switch on SHDN, the voltage on SHDN will increase
relative to the R ? C time constant or R SS ? C SS . After one
time constant SHDN will rise to approximately 63.2% of
the voltage on V IN . From 0V to approximately 0.77V on
SHDN, no switching will occur because the shutdown
threshold is 0.77V (typ). From 0.77V to 1V the maximum
LQH43MN470J03 47
LQH43MN101J03 100
DU6629-470M 47
DU6629-101M 100
1.5
2.5
0.64
1.27
2.6
2.92
Murata
www.murata.com
Coev Magnetics
www.circuitprotection.com
switch pin current capability of the LTC3450 will gradually
increase from near zero to the maximum current limit. An
R SS in the range of 1M ? to 10M ? is recommended. If
SHDN is driven high with a logic signal, the input current
Capacitor Selection
The boost converter requires two capacitors. The input
capacitor should be an X5R type of at least 1 μ F. The V OUT
capacitor should also be an X5R type between 2.2 μ F and
10 μ F. A larger capacitor (10 μ F) should be used if lower
will gradually increase to its maximum value in approxi-
mately 50 μ s.
V IN
R SS
1M
5%
output ripple is desired or the output load required is close
to the 10mA maximum.
C SS
6.8nF
5 SHDN
The charge pumps require flying capacitors of at least
0.1 μ F to obtain specified performance. Ceramic X5R types
are strongly recommended for their low ESR and ESL and
capacitance versus bias voltage stability. The filter capaci-
tor on V2X should be at least 0.1 μ F. A 0.47 μ F or larger
capacitoronV2XisrecommendedifV INV isconnectedto
V2X. The filter capacitors on V3X and V NEG should be
0.1 μ F or larger. Please be certain that the capacitors used
are rated for the maximum voltage with adequate safety
margin. Refer to Table 2 for a listing of capacitor vendors.
1ms SOFT-START WITH 3.6V V IN
3450 F02
Figure 2. Soft-Start Component Configuration
Printed Circuit Board Layout Guidelines
High speed operation of the LTC3450 demands careful
attention to PCB layout. You will not get advertised perfor-
mance with careless layout. Figure 3 shows the recom-
mended component placement for a single layer PCB. A
Table 2. Capacitor Vendor Information
Supplier Phone
Website
multilayer board with a separate ground plane is ideal but
not absolutely necessary.
AVX
Murata
Taiyo Yuden
(803) 448-9411
(714) 852-2001
(408) 573-4150
www.avxcorp.com
www.murata.com
www.t-yuden.com
3450fa
9
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| LTC3452EUF#PBF | 功能描述:IC LED DRIVER PHOTO FLASH 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
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