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参数资料
| 型号： | LT3580IMS8E#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST INV SEPIC 2A 8MSOP |
| 标准包装： | 2,500 |
| 类型： | 升压（升压），反相，Sepic |
| 输出数： | 1 |
| 输入电压： | 2.5 V ~ 32 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 2.5MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MSOP-EP |
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LT3580
APPLICATIONS INFORMATION
R FB =
Setting Output Voltage
The output voltage is set by connecting a resistor (R FB )
from V OUT to the FB pin. R FB is determined from the
following equation:
| V OUT ? V FB |
83.3μA
where V FB is 1.215V (typical) for non-inverting topologies
(i.e., boost and SEPIC regulators) and 5mV (typical) for
inverting topologies (see the Electrical Characteristics).
Power Switch Duty Cycle
In order to maintain loop stability and deliver adequate
current to the load, the power NPN (Q1 in the Block Dia-
gram) cannot remain “on” for 100% of each clock cycle.
The maximum allowable duty cycle is given by:
Inductor Selection
General Guidelines: The high frequency operation of the
LT3580 allows for the use of small surface mount inductors.
For high efficiency, choose inductors with high frequency
core material, such as ferrite, to reduce core losses. To
improve efficiency, choose inductors with more volume
for a given inductance. The inductor should have low
DCR (copper wire resistance) to reduce I 2 R losses, and
must be able to handle the peak inductor current without
saturating. Note that in some applications, the current
handling requirements of the inductor can be lower, such
as in the SEPIC topology, where each inductor only carries
a fraction of the total switch current. Molded chokes or chip
inductors usually do not have enough core area to sup-
port peak inductor currents in the 2A to 3A range. To
minimize radiated noise, use a toroidal or shielded inductor.
Note that the inductance of shielded types will drop more
DC MAX =
(T P ? Min Off Time)
T P
? 100%
as current increases, and will saturate more easily. See
Table 1 for a list of inductor manufacturers. Thorough lab
evaluation is recommended to verify that the following
where T P is the clock period and Min Off Time (found in
the Electrical Characteristics) is typically 60ns.
guidelines properly suit the final application.
Table 1.Inductor Manufacturers
The application should be designed so that the operating
duty cycle does not exceed DC MAX .
Coilcraft
DO3316P, MSS7341 and LPS4018
Series
www.coilcraft.com
Duty cycle equations for several common topologies are
given below, where V D is the diode forward voltage drop
and V CESAT is typically 300mV at 1.5A.
Coiltronics DR, LD and CD Series
Murata LQH55D and LQH66S Series
Sumida CDRH5D18B/HP, CDR6D23MN,
CDRH6D26/HP, CDRH6D28,
www.coiltronics.com
www.murata.com
www.sumida.com
V OUT ? V IN + V D
V OUT + V D ? V CESAT
V D + | V OUT |
V IN + | V OUT | + V D ? V CESAT
For the boost topology:
DC ?
For the SEPIC or dual inductor inverting topology (see
Figures 1 and 2):
DC ?
The LT3580 can be used in configurations where the duty
cycle is higher than DC MAX , but it must be operated in the
discontinuous conduction mode so that the effective duty
cycle is reduced.
CDR7D28MN and CDRH105R Series
TDK RLF7030 and VLCF4020 Series www.tdk.com
Würth WE-PD and WE-PD2 Series www.we-online.com
Minimum Inductance : Although there can be a tradeoff with
efficiency, it is often desirable to minimize board space by
choosing smaller inductors. When choosing an inductor,
there are two conditions that limit the minimum inductance;
(1) providing adequate load current, and (2) avoidance of
subharmonic oscillation. Choose an inductance that is high
enough to meet both of these requirements.
Adequate Load Current : Small value inductors result in
increased ripple currents and thus, due to the limited peak
switch current, decrease the average current that can be
3580fg
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3580MPMS8E | 制造商:LINER 制造商全称:Linear Technology 功能描述:Boost/Inverting DC/DC Converter with 2A Switch, Soft-Start, and Synchronization |
| LT3580MPMS8E#PBF | 功能描述:IC REG BOOST INV SEPIC 2A 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT3580MPMS8E#PBF | 制造商:Linear Technology 功能描述:IC DC-DC CONV 2.5MHz MSOP8 |
| LT3580MPMS8E#TRPBF | 功能描述:IC REG BOOST INV SEPIC 2A 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT3581 | 制造商:LINER 制造商全称:Linear Technology 功能描述:3.3A Boost/Inverting DC/DC Converter with Fault Protection |
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