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| 型号： | DC1597A |
| 厂商： | Linear Technology |
| 文件页数： | 11/22页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL LTM8031 |
| 产品培训模块： | µModule® Family of EN55022 Class B Certified Regulators |
| 软件下载： | LTM8031 Spice Model |
| 设计资源： | DC1597A Design Files |
| 标准包装： | 1 |
| 系列： | µModule® |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 3.3V |
| 电流 - 输出： | 1A |
| 输入电压： | 5 ~ 36 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 750kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LTM8031 |
| 相关产品： | LTM8031MPV#PBF-ND - IC DC-DC UMODULE 1A LN 71LGA LTM8031EV#PBF-ND - IC BUCK ADJ 1A 71LGA LTM8031IV#PBF-ND - IC BUCK ADJ 1A 71LGA |
LTM8031
APPLICATIONS INFORMATION
BIAS Pin Considerations
The BIAS pin is used to provide drive power for the internal
power switching stage and operate internal circuitry. For
proper operation, it must be powered by at least 2.8V. If
the output voltage is programmed to be 2.8V or higher,
simply tie BIAS to AUX. If V OUT is less than 2.8V, BIAS
can be tied to V IN or some other voltage source. In all
cases, ensure that the maximum voltage at the BIAS pin
is both less than 25V and the sum of V IN and BIAS is less
than 56V. If BIAS power is applied from a remote or noisy
voltage source, it may be necessary to apply a decoupling
capacitor locally to the LTM8031.
Load Sharing
Two or more LTM8031s may be paralleled to produce higher
currents. This may, however, alter the EMI performance of
the LTM8031s. To do this, tie the V IN , ADJ, V OUT and SHARE
pins of all the paralleled LTM8031s together. To ensure that
paralleled modules start up together, the RUN/SS pins may
be tied together, as well. Synchronize the LTM8031s to an
external clock to eliminate beat frequencies, if required.
If the RUN/SS pins are not tied together, make sure that
the same valued soft-start capacitors are used for each
module. An example of two LTM8031 modules configured
for load sharing is given in the Typical Applications sec-
tion. For 2A applications also see the LTM8032, 2A EMC
DC/DC μModule regulator
Burst Mode Operation
To enhance efficiency at light loads, the LTM8031 auto-
matically switches to Burst Mode operation which keeps
the output capacitor charged to the proper voltage while
minimizing the input quiescent current. During Burst Mode
operation, the LTM8031 delivers single cycle bursts of
current to the output capacitor followed by sleep periods
where the output power is delivered to the load by the output
capacitor. In addition, V IN and BIAS quiescent currents are
reduced to typically 25μA and 60μA respectively during
the sleep time. As the load current decreases towards a
no-load condition, the percentage of time that the LTM8031
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 LTM8031 is a step-down converter, so a minimum
amount of headroom is required to keep the output in regu-
lation. In addition, the input voltage required to turn on is
higher than that required to run, and depends upon whether
the RUN/SS is used. As shown in the Typical Performance
Characteristics section, it takes only about 3.6V IN for the
LTM8031 to run a 3.3V output at light load. If RUN/SS is
pulled up to V IN , it takes 5.7V IN to start. If the LTM8031
is enabled via the RUN/SS pin, the minimum voltage to
start at light loads is lower, about 4.4V. Similar curves for
2.5V OUT , 5V OUT and 8V OUT operation are also provided in
the Typical Performance Characteristics section.
Soft-Start
The RUN/SS pin can be used to soft-start the LTM8031,
reducing the maximum input current during start-up. The
RUN/SS pin is driven through an external RC network to
create a voltage ramp at this pin. Figure 1 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.
8031fb
11
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