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| 型号： | LTC3201EMS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 10-MSOP |
| 标准包装： | 2,500 |
| 拓扑： | 升压（升压），切换式电容器（充电泵） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1.8MHz |
| 电源电压： | 2.7 V ~ 4.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
LTC3201
APPLICATIO S I FOR ATIO
Power Efficiency
The power efficiency ( η ) of the LTC3201 is similar to that
of a linear regulator with an effective input voltage of twice
the actual input voltage. This occurs because the input
current for a voltage doubling charge pump is approxi-
mately twice the output current. In an ideal regulator the
power efficiency would be given by:
V IN , V FILTER Capacitor Selection
The value and resonant frequency of C FILTER and C IN
greatly determine the current noise profile at V IN . C FILTER
should be a high frequency 0.22 μ F capacitor with a reso-
nant frequency over 30MHz. Input capacitor C IN should be
a 1 μ F ceramic capacitor with a resonant frequency over
1MHz. The X5R capacitor is a good choice for both. The
= = OUT
η=
P OUT
P IN
V OUT ? I OUT V
V IN ? 2 I OUT 2 V IN
values of C FILTER (0.22 μ F) and C IN (1 μ F) provide optimum
high and low frequency input current filtering. A higher
filter cap value will result in lower low frequency input
At moderate to high output power the switching losses
and quiescent current of LTC3201 are relatively low. Due
to the high clocking frequency, however, the current used
for charging and discharging the switches starts to reduce
efficiency. Furthermore, due to the low V F of the LEDs,
power delivered will remain low.
Short-Circuit/Thermal Protection
The LTC3201 has short-circuit current limiting as well as
overtemperature protection. During short-circuit condi-
tions, the output current is limited to typically 150mA.
On-chip thermal shutdown circuitry disables the charge
pump once the junction temperature exceeds approxi-
mately 160 ° C and re-enables the charge pump once the
junction temperature drops back to approximately 150 ° C.
The LTC3201 will cycle in and out of thermal shutdown
indefinitely without latchup or damage until the short-
circuit on V OUT is removed.
V OUT Capacitor Selection
The style and value of capacitors used with the LTC3201
determine several important parameters such as output
ripple, charge pump strength and minimum start-up time.
To reduce noise and ripple, it is recommended that low
ESR (<0.1 ? ) capacitors be used for C FILTER , C IN , C OUT .
These capacitors should be ceramic.
The value of C OUT controls the amount of output ripple.
Increasing the size of C OUT to 10 μ F or greater will reduce
the output ripple at the expense of higher turn-on times
and start-up current. See the section Output Ripple. A 1 μ F
C OUT is recommended.
current ripple, but with increased high frequency ripple.
The key at the FILTER node is that the capacitor has to be
very high frequency. If capacitor technology improves the
bandwidth, then higher values should be used. Similarly,
increasing the input capacitor value but decreasing its
resonant frequency will not really help. Decreasing it will
help the high frequency performance while increasing the
low frequency current ripple.
Direct Connection to Battery
Due to the ultra low input current ripple, it is possible to
connect the LTC3201 directly to the battery without using
regulators or high frequency chokes.
Flying Capacitor Selection
Warning: A polarized capacitor such as tantalum or alumi-
num should never be used for the flying capacitor since its
voltage can reverse upon start-up. Low ESR ceramic
capacitors should always be used for the flying capacitor.
The flying capacitor controls the strength of the charge
pump. In order to achieve the rated output current it is
necessary to have at least 0.22 μ F of capacitance for the
flying capacitor. Capacitors of different materials lose
their capacitance with higher temperature and voltage at
different rates. For example, a ceramic capacitor made of
X7R material will retain most of its capacitance from
– 40 ° C to 85 ° C whereas a Z5U and Y5V style capacitor will
lose considerable capacitance over that range. Z5U and
Y5V capacitors may also have a very strong voltage
coefficient causing them to lose 60% or more of their
capacitance when the rated voltage is applied. Therefore,
when comparing different capacitors it is often more
3201f
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相关代理商/技术参数 |
参数描述 |
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| LTC3202 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Low Noise, High Efficiency Charge Pump for White LEDs |
| LTC3202EDD | 功能描述:IC LED DRIVR WHITE BCKLGT 10-DFN RoHS:否 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| LTC3202EDD#PBF | 功能描述:IC LED DRIVR WHITE BCKLGT 10-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:60 系列:- 恒定电流:- 恒定电压:- 拓扑:线性（LDO），PWM，升压（升压） 输出数:8 内部驱动器:是 类型 - 主要:背光 类型 - 次要:RGB，白色 LED 频率:500kHz ~ 1.5MHz 电源电压:4.75 V ~ 26 V 输出电压:45V 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* 工作温度:-40°C ~ 85°C |
| LTC3202EDD#TR | 功能描述:IC LED DRIVR WHITE BCKLGT 10-DFN RoHS:否 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 |
| LTC3202EDD#TRPBF | 功能描述:IC LED DRIVR WHITE BCKLGT 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 |
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