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| 型号： | LTM8027EV#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/22页 |
| 文件大小： | 0K |
| 描述： | IC BUCK SYNC ADJ 4A 113LGA |
| 产品培训模块： | LTM8027 - 60V, 4A DC/DC µModule Regulator Power Module vs. Discrete DC to DC |
| 软件下载： | LTM8027 Spice Model |
| 产品目录绘图： | LTM Series_15x15x4.3 |
| 设计资源： | DC1307A Design Files LTM8027EV#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）： | 4.5V |
| 电压 - 输入（最大）： | 60V |
| Voltage - Output 1： | 2.5 ~ 24 V |
| 电流 - 输出（最大）： | 4A |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 113-LGA |
| 尺寸/尺寸： | 0.59" L x 0.59" W x 0.17" H（15.0mm x 15.0mm x 4.3mm） |
| 包装： | 托盘 |
| 工作温度： | -40°C ~ 125°C |
| 效率： | 95% |
| 产品目录页面： | 2711 (CN2011-ZH PDF) |
| 配用： | DC1307A-ND - BOARD EVAL LTM8027 |
LTM8027
APPLICATIONS INFORMATION
R A = 49.9k ? ?
– 1 ? = 464k
I RUN = IN
V SUPPLY
R A
RUN PIN
R B
8027 F02
Figure 2. Undervoltage Lockout Resistive Divider
Example: Select R B = 49.9k, V IN(ON) = 14.5V (based upon
a 15V minimum input voltage)
? 14.5V ?
? 1.4V ?
The V IN turn off voltage is 15% below turn on. In the
example the V IN(OFF) would be 12.3V. The shutdown func-
tion can be disabled by connecting the RUN pin to the V IN
pin through a large value pull-up resistor, (R PU ). This pin
contains a low impedance clamp at 6V, so the RUN pin
will sink current from the R PU pull-up resistor:
V – 6V
R PU
Because this arrangement will clamp the RUN pin to 6V,
it will violate the 5V absolute maximum voltage rating of
the pin. This is permitted, however, as long as the absolute
maximum input current rating of 1mA is not exceeded.
Input RUN pin currents of <100μA are recommended: a
1M or greater pull-up resistor is typically used for this
configuration.
Hot-Plugging Safely
The small size, robustness and low impedance of ceramic
capacitors make them an attractive option for the input
bypass capacitor of LTM8027. However, these capacitors
can cause problems if the LTM8027 is plugged into a live
supply (see Linear Technology Application Note 88 for
a complete discussion). The low loss ceramic capacitor
combined with stray inductance in series with the power
source forms an under damped tank circuit, and the volt-
age at the V IN pin of the LTM8027 can ring to twice the
nominal input voltage, possibly exceeding the LTM8027’s
rating and damaging the part. If the input supply is poorly
controlled or the user will be plugging the LTM8027 into an
energized supply, the input network should be designed to
prevent this overshoot by introducing a damping element
into the path of current flow. This is often done by add-
ing an inexpensive electrolytic bulk capacitor across the
input terminals of the LTM8027. The criteria for selecting
this capacitor is that the ESR is high enough to damp
the ringing, and the capacitance value is several times
larger than the LTM8027 ceramic input capacitor. The bulk
capacitor does not need to be located physically close to
the LTM8027; it should be located close to the application
board’s input connector, instead.
Synchronization
The oscillator can be synchronized to an external clock.
Choose the R T resistor such that the resultant frequency is
at least 10% below the desired synchronization frequency.
It is recommended that the SYNC pin be driven with a
square wave that has amplitude greater than 2.3V, pulse
width greater than 1μs and rise time less than 500ns. The
rising edge of the sync wave form triggers the discharge
of the internal oscillator capacitor.
PCB Layout
Most of the headaches associated with PCB layout have
been alleviated or even eliminated by the high level of
integration of the LTM8027. The LTM8027 is neverthe-
less a switching power supply, and care must be taken to
minimize EMI and ensure proper operation. Even with the
high level of integration, you may fail to achieve specified
operation with a haphazard or poor layout. See Figure 3
for a suggested layout.
8027fb
14
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相关代理商/技术参数 |
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| LTM8027IV | 制造商:LINER 制造商全称:Linear Technology 功能描述:60V, 4A DC/DC Module Regulator |
| LTM8027IV#PBF | 功能描述:IC BUCK SYNC ADJ 4A 113LGA RoHS:是 类别:电源 - 板载 >> DC DC Converters 系列:µModule® 设计资源:VI-200, VI-J00 Design Guide, Appl Manual 标准包装:1 系列:* 类型:隔离 输出数:1 电压 - 输入（最小）:21V 电压 - 输入（最大）:32V Voltage - Output 1:5V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:* 电源（瓦） - 制造商系列:100W 电压 - 隔离:* 特点:* 安装类型:通孔 封装/外壳:9-SlimMod 尺寸/尺寸:4.60" L x 1.80" W x 0.52" H（116.8mm x 45.7mm x 13.2mm） 包装:散装 工作温度:-25°C ~ 85°C 效率:* 电源（瓦特）- 最大:* |
| LTM8027IV#PBF | 制造商:Linear Technology 功能描述:DC/DC Converter IC |
| LTM8027IVPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:60V, 4A DC/DC Module Regulator |
| LTM8027MPV | 制造商:LINER 制造商全称:Linear Technology 功能描述:60V, 4A DC/DC Module Regulator |
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