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| 型号： | LTM8052IV#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/30页 |
| 文件大小： | 0K |
| 描述： | IC UMODULE CVCC STEP DOWN 81LGA |
| 产品培训模块： | LTM8026 and LTM8052 Step-Down uModule Regulators |
| 标准包装： | 119 |
| 系列： | µModule® |
| 类型： | 非隔离（POL） |
| 输出数： | 1 |
| 电压 - 输入（最小）： | 6V |
| 电压 - 输入（最大）： | 36V |
| Voltage - Output 1： | 1.2 ~ 24 V |
| 电流 - 输出（最大）： | 5A |
| 特点： | 带有 UVLO |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 81-BLGA |
| 尺寸/尺寸： | 0.59" L x 0.44" W x 0.11" H（15.0mm x 11.3mm x 2.8mm） |
| 包装： | 托盘 |
| 工作温度： | -40°C ~ 125°C |
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LTM8052/LTM8052A
APPLICATIONS INFORMATION
R1 =
V ENA – 1.084 ? UVLO
R2 =
In situations where the output of the LTM8052/LTM8052A
is required to sink current (that is, the load is driving cur-
rent into the LTM8052/LTM8052A output), the μModule
regulator will maintain voltage regulation as long as the
negative current limit is not exceeded. If the current
limit is exceeded, the output voltage may begin to rise.
If the output voltage rises more than 125% of the target
regulation voltage, the output overvoltage protection will
engage, and the LTM8052/LTM8052A will stop switch-
ing. In this situation, the load will be free to pull up the
LTM8052/LTM8052A output. The LTM8052A does not
have the output overvoltage protection, making it ideal
for applications where the current must remain in regula-
tion even if the output rises above the voltage regulation
target. For example, in a thermo-electric cooling (TEC)
application, the voltage is not particularly important and
an output overvoltage cut-off function could be more of
a nuisance than a benefit, so the LTM8052A is a good
choice. In a voltage regulation application, output OVP is
a nice feature to have to protect the load. In a LED drive,
even though it is primarily a current regulation applica-
tion, choose the LTM8052 in order to use the OVP as an
open LED protection.
If the output voltage of either the LTM8052 or the LTM8052A
rises above the input, current will flow through an internal
power diode. The output will be clamped to a diode drop
above the input, and current regulation will be lost.
Thermal Shutdown
If the part is too hot, the LTM8052/LTM8052A engages its
thermal shutdown, terminates switching and discharges
the soft-start capacitor. When the part has cooled, the
part automatically restarts. This thermal shutdown is
set to engage at temperatures above the 125°C absolute
maximum internal operating rating to ensure that it does
not interfere with functionality in the specified operat-
ing range. This means that internal temperatures will
exceed the 125°C absolute maximum rating when the
overtemperature protection is active, possibly impairing
the device’s reliability.
UVLO and Shutdown
The LTM8052/LTM8052A has an internal UVLO that
terminates switching, resets all logic, and discharges
the soft-start capacitor when the input voltage is below
6V. The LTM8052/LTM8052A also has a precision RUN
function that enables switching when the voltage at the
RUN pin rises to 1.68V and shuts down the LTM8052/
LTM8052A when the RUN pin voltage falls to 1.55V. There
is also an internal current source that provides 5.5μA of
pull-down current to program additional UVLO hysteresis.
For RUN rising, the current source is sinking 5.5μA until
RUN = 1.68V, after which the current source turns off.
For RUN falling, the current source is off until the RUN =
1.55V, after which it sinks 5.5μA. The following equations
determine the voltage divider resistors for programming
the falling UVLO voltage and rising enable voltage (V ENA )
as configured in Figure 4.
1.55V ? R2
UVLO – 1.55V
5.5μA
The RUN pin has an absolute maximum voltage of 6V.
To accommodate the largest range of applications, there
is an internal Zener diode that clamps this pin, so that it
can be pulled up to a voltage higher than 6V through a
resistor that limits the current to less than 100μA. For
applications where the supply range is greater than 4:1,
size R2 greater than 375k.
V IN V IN
LTM8052 R2
RUN
R1
8052 F04
Figure 4. UVLO Configuration
17
For more information www.linear.com/LTM8052
8052fc
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTM8061 | 制造商:LINER 制造商全称:Linear Technology 功能描述:32V, 2A μModule Li-Ion/ Polymer Battery Charger |
| LTM8061EV-4.1#PBF | 功能描述:IC BATTERY CHARGER 4.1V 77-LGA RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:µModule® 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LTM8061EV-4.1PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:32V, 2A μModule Li-Ion/ Polymer Battery Charger |
| LTM8061EV-4.2#PBF | 功能描述:IC BATTERY CHARGER 4.2V 77-LGA RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:µModule® 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LTM8061EV-4.2PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:32V, 2A μModule Li-Ion/ Polymer Battery Charger |
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