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参数资料
| 型号： | LTC3814IFE-5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/30页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 16-TSSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 90% |
| 电源电压： | 4.5 V ~ 55 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3814-5
APPLICATIONS INFORMATION
For many designs it is possible to choose a single capacitor
type that satis?es both the ESR and bulk C requirements
for the design. In certain demanding applications, however,
the ripple voltage can be improved signi?cantly by con-
necting two or more types of capacitors in parallel. For
example, using a low ESR ceramic capacitor can minimize
the ESR step, while an electrolytic capacitor can be used
to supply the required bulk C.
Once the output capacitor ESR and bulk capacitance
have been determined, the overall ripple voltage wave-
form should be veri?ed on a dedicated PC board (see PC
Board Layout Checklist section for more information on
component placement). Lab breadboards generally suffer
than other types. Tantalum capacitors have the highest
capacitance density but it is important to only use types
that have been surge tested for use in switching power
supplies. Several excellent surge-tested choices are the
AVX TPS and TPSV or the KEMET T510 series. Aluminum
electrolytic capacitors have signi?cantly higher ESR, but
can be used in cost-driven applications providing that
consideration is given to ripple current ratings and long
term reliability. Other capacitor types include Panasonic
SP and Sanyo POSCAPs. In applications with V OUT > 30V,
however, choices are limited to aluminum electrolytic and
ceramic capacitors.
from excessive series inductance (due to inter-component
L
D
V OUT
wiring), and these parasitics can make the switching
waveforms look signi?cantly worse than they would be
V IN
SW
C OUT
R L
on a properly designed PC board.
The output capacitor in a boost regulator experiences high
RMS ripple currents, as shown in Figure 8d. The RMS
8a. Circuit Diagram
output capacitor ripple current is:
I L
I IN
I RMS(COUT) I O(MAX) ?
V O – V IN(MIN)
V IN(MIN)
8b. Inductor and Input Currents
Note that the ripple current ratings from capacitor manu-
facturers are often based on only 2000 hours of life. This
makes it advisable to further derate the capacitor or to
choose a capacitor rated at a higher temperature than
required. Several capacitors may also be placed in parallel
to meet size or height requirements in the design.
Manufacturers such as Nichicon, Nippon Chemi-con
I SW
t ON
8c. Switch Current
and Sanyo should be considered for high performance
throughhole capacitors. The OS-CON (organic semicon-
I D
t OFF
I O
ductor dielectric) capacitor available from Sanyo has the
lowest product of ESR and size of any aluminum electrolytic
at a somewhat higher price. An additional ceramic capaci-
8d. Diode and Output Currents
Δ V COUT
tor in parallel with OS-CON capacitors is recommended
to reduce the effect of their lead inductance.
In surface mount applications, multiple capacitors placed
in parallel may be required to meet the ESR, RMS current
V OUT
(AC)
Δ V ESR
RINGING DUE TO
TOTAL INDUCTANCE
(BOARD + CAP)
handling and load step requirements. Dry tantalum, special
polymer and aluminum electrolytic capacitors are available
8e. Output Voltage Ripple Waveform
38145 F08
in surface mount packages. Special polymer capacitors
offer very low ESR but have lower capacitance density
16
Figure 8. Switching Waveforms for a Boost Converter
38145fc
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| LTC3816EFE#PBF | 功能描述:IC DC-DC CTLR S-PHASE 38TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| LTC3816EFE#TRPBF | 功能描述:IC CONTROLLER S-PHASE 38TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3816EUHF#PBF | 功能描述:IC DC-DC CTLR S-PHASE 32QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| LTC3816EUHF#TRPBF | 功能描述:IC CONTROLLER S-PHASE 32QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3816IFE#PBF | 功能描述:IC CONTROLLER S-PHASE 38TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
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