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參數(shù)資料
| 型號： | LTC3215 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 700mA Low Noise High Current LED Charge Pump |
| 中文描述： | 700mA的低噪音，高電流LED電荷泵 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 162K |
| 代理商： | LTC3215 |
LTC3215
9
3215f
compare the amount of achievable capacitance for a given
case size rather than comparing the specified capacitance
value. For example, over rated voltage and temperature
conditions, a 1
μ
F, 10V, Y5V ceramic capacitor in a 0603 case
may not provide any more capacitance than a 0.22
μ
F, 10V,
X7R available in the same case. The capacitor
manufacturer’s data sheet should be consulted to determine
what value of capacitor is needed to ensure minimum
capacitances at all temperatures and voltages.
Table 2 shows a list of ceramic capacitor manufacturers
and how to contact them.
Table 2. Recommended Capacitor Vendors
AVX
Kemet
Murata
Taiyo Yuden
Vishay
TDK
www.avxcorp.com
www.kemet.com
www.murata.com
www.t-yuden.com
www.vishay.com
www.tdk.com
Layout Considerations and Noise
Due to its high switching frequency and the transient
currents produced by the LTC3215, careful board layout is
necessary. A true ground plane and short connections to
all capacitors will improve performance and ensure proper
regulation under all conditions.
The flying capacitor pins C1
+
, C2
+
, C1
–
and C2
–
will have
very high edge rate waveforms. The large dv/dt on these
pins can couple energy capacitively to adjacent PCB runs.
Magnetic fields can also be generated if the flying capaci-
tors are not close to the LTC3215 (i.e., the loop area is
large). To decouple capacitive energy transfer, a Faraday
shield may be used. This is a grounded PCB trace between
the sensitive node and the LTC3215 pins. For a high quality
AC ground, it should be returned to a solid ground plane
that extends all the way to the LTC3215.
The following guidelines should be followed when design-
ing a PCB layout for the LTC3215.
The Exposed Pad should be soldered to a large copper
plane that is connected to a solid, low impedance
ground plane using plated, through-hole vias for proper
heat sinking and noise protection.
Input and output capacitors (C
IN
and C
CPO
) must also
be placed as close to the part as possible.
The flying capacitors must also be placed as close to the
part as possible. The traces running from the pins to the
capacitor pads should be as wide as possible.
V
IN
, CPO and I
LED
traces must be made as wide as
possible. This is necessary to minimize inductance,
as well as provide sufficient area for high current
applications.
LED pads must be large and should be connected to as
much solid metal as possible to ensure proper heat
sinking.
APPLICATIOU
W
U
U
PIN 1
R
C1
C2
C
IN
3215 F04
C
CPO
Figure 4. Example Board Layout
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| LTC3215EDD#TR | 功能描述:IC LED DRIVR WHITE BCKLGT 10-DFN RoHS:否 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標(biāo)準(zhǔn)包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?開路漏極，PWM 輸出數(shù):4 內(nèi)部驅(qū)動器:是 類型 - 主要:LED 閃爍器 類型 - 次要:- 頻率:400kHz 電源電壓:2.3 V ~ 5.5 V 輸出電壓:- 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-HVSON 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C 其它名稱:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LTC3215EDD#TRPBF | 功能描述:IC LED DRIVR WHITE BCKLGT 10-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標(biāo)準(zhǔn)包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?開路漏極，PWM 輸出數(shù):4 內(nèi)部驅(qū)動器:是 類型 - 主要:LED 閃爍器 類型 - 次要:- 頻率:400kHz 電源電壓:2.3 V ~ 5.5 V 輸出電壓:- 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-HVSON 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C 其它名稱:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LTC3216 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:700mA Low Noise High Current LED Charge Pump |
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