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| 型号： | LTC3100EUD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 20/26页 |
| 文件大小： | 403K |
| 描述： | IC REG BUCK/BOOST/LINEAR 16-QFN |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 121 |
| 拓扑： | 降压（降压）（1），升压（升压）（1），线性（LDO）（1） |
| 功能： | 任何功能 |
| 输出数： | 3 |
| 频率 - 开关： | 1.5MHz |
| 电压/电流 - 输出 1： | 0.6 V ~ 5.5 V，250mA |
| 电压/电流 - 输出 2： | 1.5 V ~ 5.25 V，700mA |
| 电压/电流 - 输出 3： | 0.6 V ~ 5.25 V，100mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 是 |
| 电源电压： | 0.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 包装： | 管件 |
LTC3100
20
3100fb
For more information www.linear.com/LTC3100
APPLICATIONS INFORMATION
Table 4. Recommended Buck Inductors
VENDOR
PART/STYLE
Coilcraft
(847) 639-6400
www.coilcraft.com
LPS3008, LPS3010, LPS3015
Coiltronics
SD3114, SD3118, SD3112
FDK
MIPF2016
MIPF2520, MIPS2520
Murata
www.murata.com
LQH32C
LQM31P
Sumida
(847) 956-0666
www.sumida.com
CDRH2D11, CDRH2D09
CMD4D06-4R7MC
CMD4D06-3R3MC
Taiyo-Yuden
www.t-yuden.com
NR3010, NR3012
TDK
www.tdk.com
VLF3010, VLF3012
LEMC3225, LBC2518
Toko
(408) 432-8282
www.tokoam.com
D3010
DB3015
D312, D301F
W黵th
(201) 785-8800
www.we-online.com
WE-TPC Type XS, S
Buck Output Capacitor Selection
A low ESR output capacitor should be utilized at the buck
output in order to minimize voltage ripple. Multilayer ce-
ramic capacitors are an excellent choice as they have low
ESR and are available in small footprints. In addition to
controlling the output ripple magnitude, the value of the
output capacitor also sets the loop crossover frequency
and therefore can impact loop stability. There is both a
minimum and maximum capacitance value required to
ensure stability of the loop. If the output capacitance is too
small, the loop crossover frequency will increase to the
point where switching delay and the high frequency parasitic
poles of the error amplifier will degrade the phase margin.
In addition, the wider bandwidth produced by a small output
capacitor will make the loop more susceptible to switching
noise. At the other extreme, if the output capacitor is too
large, the crossover frequency can decrease too far below
the compensation zero and also lead to degraded phase
margin. Table 5 provides a guideline for the range of al-
lowable values of low ESR output capacitors. Larger value
output capacitors can be accommodated provided they
have sufficient ESR to stabilize the loop or by increasing
the value of the feedforward capacitor in parallel with the
upper resistor divider resistor.
Note that even X5R and X7R type ceramic capacitors have
a DC bias effect which reduces their capacitance with a DC
voltage applied. This effect is particularly bad for capacitors
in the smallest case sizes. Consult the manufacturers data
for the capacitor you select to be assured of having the
necessary capacitance in your application.
Table 5. Buck Output Capacitor Range
V
OUT
C
MIN
C
MAX
0.6V
15礔
300礔
0.8V
15礔
230礔
1.2V
10礔
150礔
1.8V
6.8礔
90礔
2.7V
6.8礔
70礔
3.3V
6.8礔
50礔
Buck Input Capacitor Selection
The V
INBK
pin provides current to the buck converter
power switch and is also the supply pin for the bucks
internal control circuitry. It is recommended that a low
ESR ceramic capacitor with a value of at least 4.7礔 be
used to bypass this pin. The capacitor should be placed
as close to the pin as possible and have a short return to
ground. For applications where the power source is more
than a few inches away, a larger bulk decoupling capacitor
is recommended.
Buck Output Voltage Programming
The output voltage is set by a resistive divider according
to the following formula:
V
OUT
=0.600V" 1+
R6
R5
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
The external divider is connected to the output as shown
in the Block Diagram. It is recommended that a feedfor-
ward capacitor be placed in parallel with resistor R6 to
improve the noise immunity of the feedback node and
reduce output ripple in Burst Mode operation. A value of
10pF will generally suffice.
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| LTC3101EUF#PBF | 功能描述:IC BUCK/BST TRPL ADJ 350MA 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:PowerPath™ 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 应用:热电冷却器 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.173"，4.40mm 宽）裸露焊盘 供应商设备封装:28-TSSOP 裸露焊盘 包装:管件 产品目录页面:1410 (CN2011-ZH PDF) |
| LTC3101EUF#TRPBF | 功能描述:IC BUCK/BST TRPL ADJ 350MA 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:PowerPath™ 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
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