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| 型号： | LTM8033MPV#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/26页 |
| 文件大小： | 0K |
| 描述： | IC DC-DC UMODULE BUCK 3A 76-LGA |
| 产品培训模块： | Power Module vs. Discrete DC to DC µModule® Family of EN55022 Class B Certified Regulators |
| 软件下载： | LTM8033 Spice Model |
| 产品目录绘图： | LTM8033 |
| 设计资源： | DC1623A Design Files LTM8033MPV#PBF Footprint.bxl |
| 特色产品： | μModule Products |
| 标准包装： | 119 |
| 系列： | µModule® |
| 类型： | 非隔离（POL） |
| 输出数： | 1 |
| 电压 - 输入（最小）： | 3.6V |
| 电压 - 输入（最大）： | 36V |
| Voltage - Output 1： | 0.8 ~ 24 V |
| 电流 - 输出（最大）： | 3A |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 76-LGA |
| 尺寸/尺寸： | 0.59" L x 0.44" W x 0.17" H（15.0mm x 11.3mm x 4.3mm） |
| 包装： | 带卷 (TR) |
| 工作温度： | -55°C ~ 125°C |
| 产品目录页面： | 2711 (CN2011-ZH PDF) |
LTM8033
APPLICATIONS INFORMATION
no-load condition, the percentage of time that the LTM8033
operates in sleep mode increases and the average input
current is greatly reduced, resulting in higher efficiency.
Burst Mode operation is enabled by tying SYNC to GND. To
disable Burst Mode operation, tie SYNC to a stable voltage
above 0.7V. Do not leave the SYNC pin floating.
Minimum Input Voltage
The LTM8033 is a step-down converter, so a minimum
amount of headroom is required to keep the output in
regulation. In addition, the input voltage required to turn
on is higher than that required to run, and depends upon
BIAS power whether RUN/SS is used. If BIAS is available
before V OUT ramps up, the minimum V IN voltage to start
may be reduced. As shown in the Typical Performance
Characteristics section, the minimum input voltage to
run a 3.3V output at light load is only about 3.6V, but, if
RUN/SS is pulled up to V IN , it takes 5.6V IN to start. If the
LTM8033 is enabled with the RUN/SS pin, the minimum
voltage to start at light loads is lower, about 4.2V. Similar
curves detailing this behavior of the LTM8033 for other
outputs are also included in the Typical Performance
Characteristics section.
Soft-Start
The RUN/SS pin can be used to soft-start the LTM8033,
reducing the maximum input current during start-up. The
RUN/SS pin is driven through an external RC filter to cre-
ate a voltage ramp at this pin. Figure 2 shows the start-up
and shutdown waveforms with the soft-start circuit. By
choosing an appropriate RC time constant, the peak start-
up current can be reduced to the current that is required to
regulate the output, with no overshoot. Choose the value
of the resistor so that it can supply at least 20μA when
the RUN/SS pin reaches 2.5V.
Frequency Foldback
The LTM8033 is equipped with frequency foldback which
acts to reduce the thermal and energy stress on the internal
power elements during a short-circuit or output overload
condition. If the LTM8033 detects that the output has fallen
out of regulation, the switching frequency is reduced as a
function of how far the output is below the target voltage.
This in turn limits the amount of energy that can be delivered
to the load under fault. During the start-up time, frequency
foldback is also active to limit the energy delivered to the
potentially large output capacitance of the load.
RUN
15k
0.22μF
RUN/SS
GND
INTERNAL
INDUCTOR
CURRENT
1A/DIV
V RUN/SS
2V/DIV
V OUT
2V/DIV
2ms/DIV
8033 F02
Figure 2. To Soft-Start the LTM8033, Add a Resistor and Capacitor to the RUN/SS Pin
8033fa
14
For more information www.linear.com/LTM8033
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