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参数资料
| 型号： | LT3580MPMS8E#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST INV SEPIC 2A 8MSOP |
| 标准包装： | 50 |
| 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： | -55°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： | 管件 |
| 供应商设备封装： | 8-MSOP-EP |
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LT3580
APPLICATIONS INFORMATION
V IN
V IN
To activate the LT3580 for V IN voltage greater than
4.5V using the double resistor configuration, choose
R UVLO1
1.3V
–
ACTIVE/
LOCKOUT
R UVLO2 = 10k and:
? + 11.6 μ A
? 10k ?
R UVLO2
(OPTIONAL)
SHDN
11.6μA
AT 1.3V
GND
+
R UVLO1 =
4.5V ? 1.32V
? 1.32V ?
?
= 22.1k
V IN + ? 1.32V
? 1.32V ?
3580 F07
Figure 7. Configurable UVLO
source voltage conditions. UVLO prevents the regulator
from operating at source voltages where these problems
might occur.
The shutdown pin comparator has voltage hysteresis with
typical thresholds of 1.32V (rising) and 1.29V (falling).
Resistor R UVLO2 is optional. R UVLO2 can be included
to reduce the overall UVLO voltage variation caused by
variations in SHDN pin current (see the Electrical Character-
istics). A good choice for R UVLO2 is ≤10k ±1%. After
choosing a value for R UVLO2 , R UVLO1 can be determined
from either of the following:
R UVLO1 =
? ? + 11.6 μ A
? R UVLO2 ?
or
Internal Undervoltage Lockout
The LT3580 monitors the V IN supply voltage in case V IN
drops below a minimum operating level (typically about
2.3V). When V IN is detected low, the power switch is
deactivated, and while sufficient V IN voltage persists, the
soft-start capacitor is discharged. After V IN is detected
high, the power switch will be reactivated and the soft-start
capacitor will begin charging.
Thermal Considerations
For the LT3580 to deliver its full output power, it is imperative
that a good thermal path be provided to dissipate the heat
generated within the package. This is accomplished by
taking advantage of the thermal pad on the underside of
the IC. It is recommended that multiple vias in the printed
circuit board be used to conduct heat away from the IC and
into a copper plane with as much area as possible.
Thermal Lockout
If the die temperature reaches approximately 165°C, the
V IN ? 1.29V
R UVLO1 =
?
? 1.29V ?
? ? + 11.6 μ A
? R UVLO2 ?
part will go into thermal lockout, the power switch will be
turned off and the soft-start capacitor will be discharged.
The part will be enabled again when the die temperature
has dropped by ~5°C (nominal).
where V IN+ and V IN– are the V IN voltages when rising or
falling respectively.
For example, to disable the LT3580 for V IN voltages below
3.5V using the single resistor configuration, choose:
Thermal Calculations
Power dissipation in the LT3580 chip comes from four
primary sources: switch I 2 R loss, NPN base drive (AC), NPN
base drive (DC), and additional input current. The following
? + 11.6 μ A
? ∞ ?
R UVLO1 =
3.5V ? 1.29V
? 1.29V ?
?
= 190.5k
formulas can be used to approximate the power losses.
These formulas assume continuous mode operation,
3580fg
14
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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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