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| 型号： | LTM8027IV#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/22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 LTM8027IV#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
For most applications, the design process is straight
forward, summarized as follows:
1. Look at Table 2 and find the row that has the desired
input range and output voltage.
2. Apply the recommended C IN , C OUT , R ADJ and R T values.
3. Connect the BIAS pins as indicated.
While these component and connection combinations have
been tested for proper operation, it is incumbent upon the
user to verify proper operation over the intended system’s
line, load and environmental conditions.
Capacitor Selection Considerations
The C IN and C OUT capacitor values in Table 2 are the
minimum recommended values for the associated oper-
ating conditions. Applying capacitor values below those
indicated in Table 2 is not recommended, and may result
in undesirable operation. Using larger values is generally
acceptable, and can yield improved dynamic response, if
it is necessary. Again, it is incumbent upon the user to
verify proper operation over the intended system’s line,
load and environmental conditions.
Ceramic capacitors are small, robust and have very low
ESR. However, not all ceramic capacitors are suitable.
X5R and X7R types are stable over temperature and ap-
plied voltage and give dependable service. Other types,
including Y5V and Z5U have very large temperature and
voltage coefficients of capacitance. In an application cir-
cuit they may have only a small fraction of their nominal
capacitance resulting in much higher output voltage ripple
than expected.
A final precaution regarding ceramic capacitors concerns
the maximum input voltage rating of the LTM8027. A
ceramic input capacitor combined with trace or cable
inductance forms a high Q (under damped) tank circuit.
If the LTM8027 circuit is plugged into a live supply, the
input voltage can ring to twice its nominal value, possi-
bly exceeding the device’s rating. This situation is easily
avoided; see the Hot-Plugging Safely section.
Input Power Requirements
The LTM8027 is biased using an internal linear regulator
to generate operational voltages from the V IN pin. Virtually
all of the circuitry in the LTM8027 is biased via this internal
linear regulator output (INTV CC on the Block Diagram).
This pin is internally decoupled with a low ESR capacitor
to GND. The INTV CC regulator generates an 8V output
provided there is ample voltage on the V IN pin. The INTV CC
regulator has approximately 1V of dropout, and will follow
the V IN pin with voltages below the dropout threshold.
The LTM8027 has a typical start-up requirement of V IN >
7.5V. This assures that the onboard regulator has ample
headroom to bring the internal regulator (INTV CC ) above
its UVLO threshold. The INTV CC regulator can only source
current, so forcing the BIAS1 pin above 8.5V allows use
of externally derived power for the IC. This effectively
shuts down the internal linear regulator and reduces
power dissipation within the LTM8027. Using the onboard
regulator for start-up, then applying power to BIAS1 from
the converter output or external supply maximizes con-
version efficiencies and is a common practice. If IBIAS1
is maintained above 6.5V using an external source, the
LTM8027 can continue to operate with V IN as low as 4.5V.
BIAS Power
The internal circuitry of the LTM8027 is powered by the
INTV CC bus, which is derived either from the afore men-
tioned internal linear regulator or the BIAS1 pin, if it is
greater than 8.5V. Since the internal linear regulator is by
nature dissipative, deriving INTV CC from an external source
through the BIAS pins reduces the power lost within the
LTM8027 and can increase overall system efficiency.
8027fb
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTM8027MPV | 制造商:LINER 制造商全称:Linear Technology 功能描述:60V, 4A DC/DC Module Regulator |
| LTM8027MPV#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:Maxi/Mini/Micro Design Guide, Appl Manual 标准包装:1 系列:微型 类型:隔离 输出数:1 电压 - 输入（最小）:18V 电压 - 输入（最大）:36V Voltage - Output 1:48V 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:模块 尺寸/尺寸:2.28" L x 1.45" W x 0.62" H（57.9mm x 36.8mm x 15.7mm） 包装:散装 工作温度:-20°C ~ 100°C 效率:* 电源（瓦特）- 最大:* 其它名称:1102-1290V24C48C100BL-ND |
| LTM8027MPV#PBF | 制造商:Linear Technology 功能描述:DC/DC Converter IC |
| LTM8027MPVPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:60V, 4A DC/DC Module Regulator |
| LTM8027V | 制造商:LINER 制造商全称:Linear Technology 功能描述:Complete Switch Mode Power Supply |
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