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参数资料
| 型号： | LTM8027MPV#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/22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 LTM8027MPV#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： | -55°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
C SS =
t FAULT =
Forexample,supposetheLTM8027needstoprovide5V
from an input voltage source that is nominally 12V. From
Table 2, the recommended R T value is 162k, which cor-
responds to an operating frequency of 210kHz. From the
graphs in the Typical Performance Characteristics, the
typical internal regulator (INTV CC ) current at 12V IN and
210kHz is 15mA. The power dissipated by the internal
linear regulator at 12V IN is given by the equation:
P INTVCC = (V IN – 8) ? I INTVCC
or only 60mW. This has a small but probably acceptable
effect on the operating temperature of the LTM8027.
If the input rises to 60V, however, the power dissipation is
a lot higher, over 780mW. This can cause unnecessarily
high junction temperatures if the INTV CC regulator must
dissipate this amount of power for very long.
Connect BIAS2 to AUX (if 24V or less) or a voltage source
above 3V.
Soft-Start
The soft-start function controls the slew rate of the power
supply output voltage during start-up. A controlled output
voltage ramp minimizes output voltage overshoot, reduces
inrush current from the V IN supply, and facilitates supply
sequencing. A capacitor connected from the SS pin to GND
programs the slew rate. The capacitor is charged from an
internal 2μA current source producing a ramped voltage
that overrides the command reference to the controller,
resulting in a smooth output voltage ramp. The soft-start
circuit is disabled once the SS pin voltage has been charged
to 200mV above the internal reference of 1.231V.
During a V IN UVLO, RUN event, or undervoltage on internal
bias, the SS pin voltage is discharged with a 50μA current.
Therefore, the value of the SS capacitor determines how
long one of these events must be in order to completely
discharge the soft-start capacitor. In the case of an output
overload or short circuit, the SS pin voltage is clamped to
a diode drop above the ADJ pin. Once the short has been
removed the V ADJ pin voltage starts to recover. The soft-
start circuit takes control of the output voltage slew rate
once the V ADJ pin voltage has exceeded the slowly ramp-
ing SS pin voltage, reducing the output voltage overshoot
during a short-circuit recovery.
The desired soft-start time (t SS ) is programmed via the
C SS capacitor as follows:
2μA ? t SS
1.231V
The amount of time in which the power supply must be
under a V IN , internal regulator (INTV CC ) or V SHDN UVLO
fault condition (t FAULT ) before the SS pin voltage enters
its active region is approximated by the following formula:
C SS ? 0.65V
50μA
Operating Frequency Trade-offs
The LTM8027 uses a constant frequency architecture that
can be programmed over a 100kHz to 500kHz range with
a single resistor from the RT pin to ground. The nominal
voltage on the RT pin is 1V and the current that flows from
this pin is used to charge an internal oscillator capacitor.
The value of R T for a given operating frequency can be
chosen from Figure 1 or Table 1.
600
500
400
300
200
100
0
0 50 100 150 200
R T (k )
8027 F01
Figure 1. Timing Resistor (R T ) Value
8027fb
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTM8027V | 制造商:LINER 制造商全称:Linear Technology 功能描述:Complete Switch Mode Power Supply |
| LTM8028EY#PBF | 制造商:Linear Technology 功能描述:DC/DC CONVERTER 0.8-1.8V 5A 9W 制造商:Linear Technology 功能描述:BUCK 6-36V100KHZ 5A 0.8-1.8V 114BGA 制造商:Linear Technology 功能描述:BUCK, 6-36V,100KHZ, 5A, 0.8-1.8V, 114BGA 制造商:Linear Technology 功能描述:VOLTAGE REGULATOR, uMODULE, BUCK, ADJ, BGA-114, Primary Input Voltage:36V, No. o |
| LTM8028IY#PBF | 制造商:Linear Technology 功能描述:DC/DC CONVERTER 0.8-1.8V 5A 9W 制造商:Linear Technology 功能描述:BUCK 6-36V100KHZ 5A 0.8-1.8V 114BGA 制造商:Linear Technology 功能描述:BUCK, 6-36V,100KHZ, 5A, 0.8-1.8V, 114BGA 制造商:Linear Technology 功能描述:VOLTAGE REGULATOR, uMODULE, BUCK, ADJ, BGA-114, Primary Input Voltage:36V, No. o |
| LTM8028MPY#PBF | 制造商:Linear Technology 功能描述:DC/DC CONVERTER 0.8-1.8V 5A 9W 制造商:Linear Technology 功能描述:BUCK 6-36V100KHZ 5A 0.8-1.8V 114BGA 制造商:Linear Technology 功能描述:BUCK, 6-36V,100KHZ, 5A, 0.8-1.8V, 114BGA 制造商:Linear Technology 功能描述:VOLTAGE REGULATOR, uMODULE, BUCK, ADJ, BGA-114, Primary Input Voltage:36V, No. of Outputs:1, Output Current:5.6A, No. of Pins:114, Operating Temperature Min:-55C, Operating Temperature Max:125C, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes |
| LTM8028MPYPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:36VIN, UltraFast, Low Output Noise 5A ??Module Regulator |
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