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参数资料
| 型号： | LTC3453EUF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER PHOTO FLASH 16-QFN |
| 标准包装： | 2,500 |
| 拓扑： | PWM，降压（降压），升压（升压） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 900kHz ~ 1.1MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 4.5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN（4x4） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
LTC3453
OPERATIO
at the current programmed by resistors R ISET1 and/or
R ISET2 . Individually enabled, each LED current setting
amplifier programs the output LED current to
I LED = 384 (0.8V/R ISET1,2 )
If both enable inputs are logic high, the setting currents are
summed internally and the output LED current will be
given by
I LED = 384 [0.8V/(R ISET1 || R ISET2 ) ]
Thus three different (nonzero) current levels are program-
mable, optimal for low current LED torch and high current
LED camera flash applications.
LED Current Sources
Each LED pin is driven by a current source specifically
designed for low dropout. The LTC3453 employs a propri-
APPLICATIO S I FOR ATIO
Component Selection
Inductor Selection
The high frequency operation of the LTC3453 allows the
use of small surface mount inductors. The inductor cur-
rent ripple is typically set to 20% to 40% of the maximum
inductor current. For a given ripple the inductance terms
are given as follows:
etary architecture that determines which of the four LEDs
requires the largest forward voltage drop at its pro-
grammed current, and then generates a feedback voltage
based on this one for closing the buck-boost regulation
loop. This results in the lowest output voltage required for
regulating all of the LEDs and thus the highest LED power
efficiency. The voltage present at the LED pin of the
“controlling LED” will be typically 130mV at 75mA of
current.
LED Detect Circuit
If fewer than four LED outputs are required, unused ones
should be connected to V OUT . Each LED pin has an internal
LED detect circuit that disables the output current source
to save power if an output is not needed. A small 30 μ A
current is employed to detect the presence of an LED at
startup.
For high efficiency, choose an inductor with a high fre-
quency core material, such as ferrite, to reduce core loses.
The inductor should have low ESR (equivalent series
resistance) to reduce the I 2 R losses, and must be able to
handle the peak inductor current without saturating. Molded
chokes or chip inductors usually do not have enough core
to support peak inductor currents >1A. To minimize radi-
ated noise, use a toroid, pot core or shielded bobbin
inductor. For the white LED application, a 4.7 μ H inductor
L >
L >
V IN ( MIN ) 2 ? ( V OUT – V IN ( MIN ) ) ? 100 %
f ? I OUT ( MAX ) ? % Ripple ? V OUT 2
V OUT ? ( V IN ( MAX ) – V OUT ) ? 100 %
f ? I OUT ( MAX ) ? % Ripple ? V IN ( MAX )
,
value is recommended. See Table 1 for a list of component
suppliers.
Table 1. Inductor Vendor Information
SUPPLIER WEB SITE
Coilcraft www.coilcraft.com
Cooper/Coiltronics www.cooperet.com
where f = operating frequency, Hz
%Ripple = allowable inductor current ripple, %
Murata
Sumida
Vishay-Dale
www.murata.com
www.japanlink.com/sumida
www.vishay.com
V IN(MIN) = minimum input voltage, V
V IN(MAX) = maximum input voltage, V
V OUT = output voltage, V
I OUT(MAX) = maximum output load current
3453fa
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3454 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1A Synchronous Buck-Boost High Current LED Driver |
| LTC3454EDD | 制造商:LINER 制造商全称:Linear Technology 功能描述:1A Synchronous Buck-Boost High Current LED Driver |
| LTC3454EDD#PBF | 功能描述:IC LED DRIVER PHOTO FLASH 10-DFN 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 |
| LTC3454EDD#TRPBF | 功能描述:IC LED DRIVER PHOTO FLASH 10-DFN 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 |
| LTC3454EDDPBF | 制造商:Linear Technology 功能描述:LED Driver 1A Buck-Boost 3.3/5V DFN10EP |
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