- 您现在的位置：买卖IC网 > PDF目录1830 > LTC3560IS6#TRPBF (Linear Technology)IC REG BUCK SYNC ADJ TSOT23-6 PDF资料下载
参数资料
| 型号： | LTC3560IS6#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ TSOT23-6 |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 5.5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 800mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-6 |
LTC3560
APPLICATIONS INFORMATION
more than powdered iron core inductors with similar
electrical characteristics. The choice of which style
inductor to use often depends more on the price versus
size requirements and any radiated ?eld/EMI requirements
than on what the LTC3560 requires to operate. Table 1
shows some typical surface mount inductors that work
well in LTC3560 applications.
If tantalum capacitors are used, it is critical that the capaci-
tors are surge tested for use in switching power supplies.
An excellent choice is the AVX TPS series of surface mount
tantalum. These are specially constructed and tested for low
ESR so they give the lowest ESR for a given volume. Other
capacitor types include Sanyo POSCAP, Kemet T510 and
T495 series, and Sprague 593D and 595D series. Consult
the manufacturer for other speci?c recommendations.
C IN and C OUT Selection
In continuous mode, the source current of the top MOSFET
is a square wave of duty cycle V OUT /V IN . To prevent large
voltage transients, a low ESR input capacitor sized for the
maximum RMS current must be used. The maximum RMS
capacitor current is given by:
Using Ceramic Input and Output Capacitors
Higher values, lower cost ceramic capacitors are now
becoming available in smaller case sizes. Their high ripple
current, high voltage rating and low ESR make them
ideal for switching regulator applications. Because the
C IN required I RMS ? I OMAX
?? V OUT ( V IN ? V OUT ) ??
V IN
1/ 2
LTC3560’s control loop does not depend on the output
capacitor’s ESR for stable operation, ceramic capacitors
can be used freely to achieve very low output ripple and
small circuit size.
This formula has a maximum at V IN = 2V OUT , where
I RMS = I OUT /2. This simple worst-case condition is
commonly used for design because even signi?cant
deviations do not offer much relief. Note that the capacitor
manufacturer’s ripple current ratings are often based on
2000 hours of life. This makes it advisable to further
derate the capacitor, or choose a capacitor rated at a
higher temperature than required. Always consult the
manufacturer if there is any question.
The selection of C OUT is driven by the required effective
series resistance (ESR). Typically, once the ESR requirement
for C OUT has been met, the RMS current rating generally
far exceeds the I RIPPLE(P-P) requirement. The output ripple
ΔV OUT is determined by:
However, care must be taken when ceramic capacitors
are used at the input and the output. When a ceramic
capacitor is used at the input and the power is supplied
by a wall adapter through long wires, a load step at the
output can induce ringing at the input, V IN . At best, this
ringing can couple to the output and be mistaken as loop
instability. At worst, a sudden inrush of current through
the long wires can potentially cause a voltage spike at V IN ,
large enough to damage the part.
When choosing the input and output ceramic capacitors,
choose the X5R or X7R dielectric formulations. These
dielectrics have the best temperature and voltage charac-
teristics of all the ceramics for a given value and size.
V OUT
I L
ESR +
1
8fC OUT
Output Voltage Programming
The output voltage is set by a resistive divider according
to the following formula:
where f = operating frequency, C OUT = output capacitance
and ΔI L = ripple current in the inductor. For a ?xed output
V OUT = 0.6V 1 +
R2
R1
(2)
voltage, the output ripple is highest at maximum input
voltage since ΔI L increases with input voltage.
The external resistive divider is connected to the output,
allowing remote voltage sensing as shown in Figure 2.
3560fb
9
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3561EDD#TRPBF | IC REG BUCK SYNC ADJ 1A 8DFN |
| LTC3562EUD#TRPBF | IC REG BUCK SYNC ADJ QUAD 20QFN |
| LTC3563EDC#TRPBF | IC REG BUCK SYNC 0.5A 6DFN |
| LTC3564IS5#TRPBF | IC REG BUCK SYNC ADJ TSOT23-5 |
| LTC3565IMSE#TRPBF | IC REG BUCK SYNC ADJ 10MSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3561 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1A, 4MHz, Synchronous Step-Down DC/DC Converter |
| LTC3561A | 制造商:LINER 制造商全称:Linear Technology 功能描述:1A, 4MHz, Synchronous Step-Down DC/DC Converter |
| LTC3561AEDD#PBF | 功能描述:IC REG BUCK SYNC ADJ 1A 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LTC3561AEDD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 1A 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LTC3561AEDD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1A, 4MHz, Synchronous Step-Down DC/DC Converter |
发布紧急采购，3分钟左右您将得到回复。