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参数资料
| 型号： | LT3580MPMS8E#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 2.8 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件页数： | 28/28页 |
| 文件大小： | 289K |
| 代理商： | LT3580MPMS8E#TRPBF |
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LT3580
9
3580fg
APPLICATIONS INFORMATION
provided to a load (IOUT). In order to provide adequate
load current, L should be at least:
L
>
DC V
IN
2(f) I
LIM
|V
OUT | IOUT
V
IN η
for boost, topologies, or:
L
>
DC V
IN
2(f) I
LIM
V
OUT IOUT
V
IN η
I
OUT
for the SEPIC and inverting topologies.
where:
L = L1||L2 for uncoupled dual inductor topologies
DC = switch duty cycle (see previous section)
ILIM = switch current limit, typically about 2.4A at 50%
duty cycle (see the Typical Performance Characteristics
section).
η = power conversion efficiency (typically 88% for
boost and 75% for dual inductor topologies at high
currents).
f = switching frequency
Negative values of L indicate that the output load current
IOUT exceeds the switch current limit capability of the
LT3580.
Avoiding Subharmonic Oscillations: The LT3580’s internal
slope compensation circuit will prevent subharmonic oscil-
lations that can occur when the duty cycle is greater than
50%, provided that the inductance exceeds a minimum
value. In applications that operate with duty cycles greater
than 50%, the inductance must be at least:
L
>
V
IN 2 DC – 1
()
(1
DC)(f)
for boost, coupled inductor SEPIC, and coupled inductor
inverting topologies, or:
L1 L2
>
V
IN 2 DC – 1
()
(1
DC)(f)
for the uncoupled inductor SEPIC and uncoupled inductor
inverting topologies.
Maximum Inductance: Excessive inductance can reduce
current ripple to levels that are difficult for the current com-
parator (A3 in the Block Diagram) to cleanly discriminate,
thus causing duty cycle jitter and/or poor regulation. The
maximum inductance can be calculated by:
L
MAX =
V
IN –VCESAT
I
MIN
RIPPLE
DC
f
where LMAX is L1||L2 for uncoupled dual inductor topolo-
gies and IMIN-RIPPLE is typically 95mA.
Current Rating: Finally, the inductor(s) must have a rating
greater than its peak operating current to prevent inductor
saturation resulting in efficiency loss. In steady state, the
peak input inductor current (continuous conduction mode
only) is given by:
I
L1
PEAK =
V
OUT IOUT
V
IN η
+
V
IN DC
2 L1 f
for the boost, uncoupled inductor SEPIC and uncoupled
inductor inverting topologies.
For uncoupled dual inductor topologies, the peak output
inductor current is given by:
I
L2
PEAK =IOUT +
V
OUT 1– DC
()
2 L2 f
For the coupled inductor topologies:
I
OUT 1+
V
OUT
ηV
IN
+
V
IN DC
2 L f
Note: Inductor current can be higher during load transients.
It can also be higher during start-up if inadequate soft-start
capacitance is used.
Capacitor Selection
Low ESR (equivalent series resistance) capacitors should
be used at the output to minimize the output ripple voltage.
Multilayer ceramic capacitors are an excellent choice, as
they have an extremely low ESR and are available in very
small packages. X5R or X7R dielectrics are preferred, as
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LT3581EDE#PBF | 功能描述:IC REG MULTI CONFIG ADJ 14DFN 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 |
| LT3581EDE#TRPBF | 功能描述:IC REG MULTI CONFIG ADJ 14DFN 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:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3581EDE-PBF | 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 |
| LT3581EDE-TRPBF | 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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