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| 型号： | LMZ10505EXTTZX/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 13/31页 |
| 文件大小： | 0K |
| 描述： | IC BUCK SYNC ADJ 5A TO-PMOD-7 |
| 产品培训模块： | SIMPLE SWITCHER Power Modules |
| 视频文件： | Power Design Invitational - Another Geek Moment |
| 标准包装： | 500 |
| 系列： | SIMPLE SWITCHER® |
| 类型： | 非隔离（POL） |
| 输出数： | 1 |
| 电压 - 输入（最小）： | 2.95V |
| 电压 - 输入（最大）： | 5.5V |
| Voltage - Output 1： | 0.8 ~ 5 V |
| 电流 - 输出（最大）： | 5A |
| 电源（瓦） - 制造商系列： | 25W |
| 特点： | 带有 UVLO |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-PMOD-7，电源模块 |
| 尺寸/尺寸： | 0.40" L x 0.54" W x 0.18" H（10.2mm x 13.8mm x 4.6mm） |
| 包装： | 带卷 (TR) |
| 工作温度： | -55°C ~ 125°C |
| 效率： | 96% |
| 电源（瓦特）- 最大： | 25W |
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LMZ10505EXT
www.ti.com
SNVS669G – JUNE 2010 – REVISED OCTOBER 2013
The PCB copper heat sink must be connected to the exposed pad (EP). Approximately thirty six, 8mils thermal
vias spaced 59mils (1.5 mm) apart must connect the top copper to the bottom copper. For an extended
discussion and formulations of thermal rules of thumb, refer to AN-2020 SNVA419 . For an example of a high
thermal performance PCB layout with θ JA of 20°C/W, refer to the evaluation board application note AN-2074
SNVA450 and for results of a study of the effects of the PCB designs, refer to AN-2026 SNVA424 .
PC Board Layout Guidelines
PC board layout is an important part of DC-DC converter design. Poor board layout can disrupt the performance
of a DC-DC converter and surrounding circuitry by contributing to EMI, ground bounce and resistive voltage drop
in the traces. These can send erroneous signals to the DC-DC converter resulting in poor regulation or instability.
Good layout can be implemented by following a few simple design rules.
V IN
LMZ10505EXT
V OUT
VIN
VOUT
C in1
Loop 1
High dI
dt
GND
Loop 2
C O1
Figure 18. High Current Loops
1. Minimize area of switched current loops.
From an EMI reduction standpoint, it is imperative to minimize the high di/dt current paths. The high current that
does not overlap contains high di/dt, see Figure 18 . Therefore physically place input capacitor (C in1 ) as close as
possible to the LMZ10505EXT VIN pin and GND exposed pad to avoid observable high frequency noise on the
output pin. This will minimize the high di/dt area and reduce radiated EMI. Additionally, grounding for both the
input and output capacitor should consist of a localized top side plane that connects to the GND exposed pad
(EP).
2. Have a single point ground.
The ground connections for the feedback, soft-start, and enable components should be routed only to the GND
pin of the device. This prevents any switched or load currents from flowing in the analog ground traces. If not
properly placed, poor grounding can result in degraded load regulation or erratic output voltage ripple behavior.
Provide the single point ground connection from pin 4 to EP.
3. Minimize trace length to the FB pin.
Both feedback resistors, R fbt and R fbb , and the compensation components, R comp and C comp , should be located
close to the FB pin. Since the FB node is high impedance, keep the copper area as small as possible. This is
most important as relatively high value resistors are used to set the output voltage.
4. Make input and output bus connections as wide as possible.
This reduces any voltage drops on the input or output of the converter and maximizes efficiency. To optimize
voltage accuracy at the load, ensure that a separate feedback voltage sense trace is made at the load. Doing so
will correct for voltage drops and provide optimum output accuracy.
5. Provide adequate device heat-sinking.
Use an array of heat-sinking vias to connect the exposed pad to the ground plane on the bottom PCB layer. If
the PCB has multiple copper layers, thermal vias can also be employed to make connection to inner layer heat-
spreading ground planes. For best results use a 6 x 6 via array with minimum via diameter of 8mil thermal vias
spaced 59mils (1.5 mm). Ensure enough copper area is used for heat-sinking to keep the junction temperature
below 125°C.
Copyright ? 2010–2013, Texas Instruments Incorporated
Product Folder Links: LMZ10505EXT
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LMZ10505TZ-ADJ | 制造商:NSC 制造商全称:National Semiconductor 功能描述:5A SIMPLE SWITCHER? Power Module with 5.5V Maximum Input Voltage |
| LMZ10505TZ-ADJ/NOPB | 功能描述:直流/直流开关转换器 5V,5A PWR MODULE RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LMZ10505TZADJNOPB | 制造商:Texas Instruments 功能描述:Module DC-DC 1-OUT 0.8V to 5V 5A 7-Pin TO-PMOD EP |
| LMZ10505TZE-ADJ | 制造商:NSC 制造商全称:National Semiconductor 功能描述:5A SIMPLE SWITCHER? Power Module with 5.5V Maximum Input Voltage |
| LMZ10505TZE-ADJ/NOPB | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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