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| 型号： | LTM8025IV#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/22页 |
| 文件大小： | 0K |
| 描述： | IC CONVERTER BUCK 3A ADJ 70LGA |
| 产品培训模块： | LTM8025 - 36VIN, 3A Step Down Regulator High Voltage µModule DC/DC Regulators Power Module vs. Discrete DC to DC |
| 软件下载： | LTM8025 Spice Model |
| 产品目录绘图： | LTM Series_15x15x4.3 |
| 设计资源： | DC1379A Design Files LTM8025IV#PBF Footprint.bxl |
| 特色产品： | LTM8025 Series μModule Products |
| 标准包装： | 170 |
| 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： | 70-LGA |
| 尺寸/尺寸： | 0.59" L x 0.35" W x 0.17" H（15.0mm x 9.0mm x 4.3mm） |
| 包装： | 托盘 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 2711 (CN2011-ZH PDF) |
| 配用： | DC1379A-ND - BOARD EVAL LTM8025 |
LTM8025
APPLICATIONS INFORMATION
For most applications, the design process is straight
forward, summarized as follows:
1. Look at Table 1 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 BIAS as indicated.
While these component 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. Bear in mind that the
maximum output current is limited by junction tempera-
turetemperature, the relationship between the input and
output voltage magnitude and polarity and other factors.
Please refer to the graphs in the Typical Performance
Characteristics section for guidance.
The maximum frequency (and attendant R T value) at
which the LTM8025 should be allowed to switch is given
in Table 1 in the f MAX column, while the recommended
frequency (and R T value) for optimal efficiency over the
given input condition is given in the f OPTIMAL column.
There are additional conditions that must be satisfied if
the synchronization function is used. Please refer to the
Synchronization section for details.
Capacitor Selection Considerations
The C IN and C OUT capacitor values in Table 1 are the
minimum recommended values for the associated oper-
ating conditions. Applying capacitor values below those
indicated in Table 1 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.
Ceramic capacitors are also piezoelectric. In Burst Mode
operation, the LTM8025’s switching frequency depends
on the load current, and can excite a ceramic capacitor
at audio frequencies, generating audible noise. Since the
LTM8025 operates at a lower current limit during Burst
Mode operation, the noise is typically very quiet to a
casual ear.
If this audible noise is unacceptable, use a high perfor-
mance electrolytic capacitor at the output. It may also be
a parallel combination of a ceramic capacitor and a low
cost electrolytic capacitor.
A final precaution regarding ceramic capacitors concerns
the maximum input voltage rating of the LTM8025. A
ceramic input capacitor combined with trace or cable
inductance forms a high Q (under damped) tank circuit.
If the LTM8025 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.
Frequency Selection
The LTM8025 uses a constant frequency PWM architecture
that can be programmed to switch from 200kHz to 2.4MHz
by using a resistor tied from the RT pin to ground. Table 2
provides a list of R T resistor values and their resultant
frequencies.
8025fc
10
For more information www.linear.com/LTM8025
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTM8025IY#PBF | 制造商:Linear Technology 功能描述:DC/DC CONVERTER 0.8-24V 72W 制造商:Linear Technology 功能描述:BUCK UMODULE 36VIN 3A LGA- 制造商:Linear Technology 功能描述:BUCK, UMODULE, 36VIN, 3A, LGA-70 制造商:Linear Technology 功能描述:DC-DC REGULATOR, BUCK, ADJ, BGA-70, Primary Input Voltage:36V, No. of Outputs:1, Output Current:3A, No. of Pins:70, Operating Temperature Min:-40C, Operating Temperature Max:125C, MSL:MSL 3 - 168 hours, Package / Case:70-BGA , RoHS Compliant: Yes |
| LTM8025MPV | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 3A Step-Down μModule Converter |
| LTM8025MPV#PBF | 功能描述:IC CONVERTER BUCK 3A ADJ 70LGA 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）:66V 电压 - 输入（最大）:160V Voltage - Output 1:12V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:* 电源（瓦） - 制造商系列:50W 电压 - 隔离:* 特点:* 安装类型:通孔 封装/外壳:9-FinMod 尺寸/尺寸:4.60" L x 1.86" W x 0.79" H（116.8mm x 47.2mm x 20.1mm） 包装:散装 工作温度:-25°C ~ 85°C 效率:* 电源（瓦特）- 最大:* |
| LTM8025MPVPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 3A Step-Down μModule Converter |
| LTM8025MPY#PBF | 制造商:Linear Technology 功能描述:DC/DC CONVERTER 0.8-24V 72W 制造商:Linear Technology 功能描述:BUCK UMODULE 36VIN 3A BGA- 制造商:Linear Technology 功能描述:BUCK, UMODULE, 36VIN, 3A, BGA-70 制造商:Linear Technology 功能描述:DC-DC REGULATOR, BUCK, ADJ, BGA-70, Primary Input Voltage:36V, No. of Outputs:1, Output Current:3A, No. of Pins:70, Operating Temperature Min:-55C, Operating Temperature Max:125C, MSL:MSL 3 - 168 hours, Package / Case:70-BGA , RoHS Compliant: Yes |
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