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| 型号： | LTC3201EMS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 10-MSOP |
| 标准包装： | 50 |
| 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： | 管件 |
| 工作温度： | -40°C ~ 85°C |
LTC3201
APPLICATIO S I FOR ATIO
appropriate to compare the achievable capacitance for a
given case size rather than discussing the specified ca-
pacitance value. For example, over the rated voltage and
temperature, a 1 μ F, 10V, Y5V ceramic capacitor in an 0603
case may not provide any more capacitance than a 0.22 μ F
10V X7R available in the same 0603 case. The capacitor
manufacturer’s data sheet should be consulted to deter-
mine what value of capacitor is needed to ensure 0.22 μ F
at all temperatures and voltages.
Below is a list of ceramic capacitor manufacturers and
how to contact them:
F is the switching frequency (1.8MHz typ).
Loop Stability
Both the style and the value of C OUT can affect the stability
of the LTC3201. The device uses a closed loop to adjust
the strength of the charge pump to match the required
output current. The error signal of this loop is directly
stored on the output capacitor. The output capacitor also
serves to form the dominant pole of the loop. To prevent
ringing or instability, it is important for the output capaci-
tor to maintain at least 0.47 μ F over all ambient and
operating conditions.
AVX
Kemet
Murata
Taiyo Yuden
Vishay
(843) 448-9411
(864) 963-6300
(770) 436-1300
(800) 348-2496
(610) 644-1300
www.avxcorp.com
www.kemet.com
www.murata.com
www.t-yuden.com
www.vishay.com
Excessive ESR on the output capacitor will degrade the
loop stability of the LTC3201. The closed loop DC imped-
ance is nominally 0.5 ? . The output will thus change by
50mV with a 100mA load. Output capacitors with ESR of
0.3 ? or greater could cause instability or poor transient
response. To avoid these problems, ceramic capacitors
Open-Loop Output Impedance
The theoretical minimum open-loop output impedance of
a voltage doubling charge pump is given by:
should be used. A tight board layout with good ground
plane is also recommended.
Soft-Start
R OUT ( MIN ) =
2 V IN – V OUT
I OUT
=
1
FC
The LTC3201 has built-in soft-start circuitry to prevent
excessive input current flow at V IN during start-up. The
soft-start time is programmed at approximately 30 μ s.
where F if the switching frequency (1.8MHz typ) and C is
the value of the flying capacitor. (Using units of MHz and
μ F is convenient since they cancel each other). Note that
the charge pump will typically be weaker than the theoreti-
cal limit due to additional switch resistance. Under normal
operation, however, with V OUT ≈ 4V, I OUT < 100mA,
V IN > 3V, the output impedance is given by the closed-loop
value of ~0.5 ? .
Output Ripple
The value of C OUT directly controls the amount of ripple for
a given load current. Increasing the size of C OUT will reduce
the output ripple at the expense of higher minimum turn-
on time and higher start-up current. The peak-to-peak
output ripple is approximated by the expression:
Layout Considerations
Due to the high switching frequency and large transient
currents produced by the LTC3201, careful board layout is
necessary. A true ground plane is a must. To minimize
high frequency input noise ripple, it is especially important
that the filter capacitor be placed with the shortest dis-
tance to the LTC3201 (1/8 inch or less). The filter capacitor
should have the highest possible resonant frequency.
Conversely, the input capacitor does not need to be placed
close to the pin. The input capacitor serves to cancel out
the lower frequency input noise ripple. Extra inductance
on the V IN line actually helps input current ripple. Note that
if the V IN trace is lengthened to add parasitic inductance,
it starts to look like an antenna and worsen the radiated
noise. It is recommended that the filter capacitor be placed
V RIPPLE ( P ? P ) ?
I OUT
2 F ? C OUT
on the left hand side next to Pin 3. The flying capacitor can
then be placed on the top of the device. It is also important
3201f
7
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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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 |
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