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参数资料
| 型号： | LTM8052IV#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PBGA81 |
| 封装： | 15 X 11.25 MM, 2.82 MM HEIGHT, ROHS COMPLIANT, MO-222, LGA-81 |
| 文件页数： | 8/28页 |
| 文件大小： | 350K |
| 代理商： | LTM8052IV#PBF |
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LTM8052
16
8052f
applicaTions inForMaTion
Figure 3. Voltage Regulation and Overvoltage Protection
Feedback Connections
Voltage Regulation and Output Overvoltage Protection
The LTM8052 uses the ADJ pin to regulate the output
voltage and to provide a high speed overvoltage lockout
to avoid high voltage conditions. If the output voltage
exceeds 125% of the regulated voltage level (1.5V at the
ADJ pin), the LTM8052 terminates switching and shuts
down switching for a brief time before restarting. The
regulated output voltage must be greater than 1.19V and
is set by the equation:
VOUT =1.19V 1+
10k
RADJ
where RADJ is shown in Figure 3.
Figure 4. UVLO Configuration
functionality in the specified operating 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
TheLTM8052hasaninternalUVLOthatterminatesswitch-
ing, resets all logic, and discharges the soft-start capacitor
when the input voltage is below 6V. The LTM8052 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 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 5.5A 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 5.5A. The following equations
determine the voltage divider resistors for programming
the falling UVLO voltage and rising enable voltage (VENA)
as configured in Figure 4.
R1
=
1.55V R2
UVLO–1.55V
R2
=
VENA –1.084UVLO
5.5A
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 100A. For
applications where the supply range is greater than 4:1,
size R2 greater than 375k.
LTM8052
VOUT
RADJ
8052 F03
ADJ
LTM8052
VIN
R2
VIN
R1
8052 F04
RUN
In situations where the output of the LTM8052 is required
to sink current (that is, the load is driving current into the
LTM8052 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 will
stop switching. In this situation, the load will be free to
pull up the LTM8052 output. If the voltage exceeds the
LTM8052 input, an internal power diode will clamp the
output to a diode drop above the input.
Thermal Shutdown
If the part is too hot, the LTM8052 engages its thermal
shutdown, terminates switching and discharges the soft-
startcapacitor.Whentheparthascooled,thepartautomati-
cally restarts. This thermal shutdown is set to engage at
temperaturesabovethe125°Cabsolutemaximuminternal
operating rating to ensure that it does not interfere with
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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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