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参数资料
| 型号： | TPS62242DRV |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | 2.25 MHz 300 mA Step Down Converter in 2x2SON/TSOT23 Package |
| 中文描述： | 2.25兆赫300毫安降压转换器2x2SON/TSOT23包 |
| 文件页数： | 11/29页 |
| 文件大小： | 859K |
| 代理商： | TPS62242DRV |
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Input Capacitor Selection
LAYOUT CONSIDERATIONS
TPS62240, TPS62242, TPS62243
SLVS762B – JUNE 2007 – REVISED SEPTEMBER 2007
The buck converter has a natural pulsating input current; therefore, a low ESR input capacitor is required for best
input voltage filtering, and minimizing the interference with other circuits caused by high input voltage spikes. For
most applications, a 4.7-
μF to 10-μF ceramic capacitor is recommended. Because ceramic capacitors lose up to
80% of its initial capacitance at 5V, it is recommended that a 10-
μF input capacitors be used for input voltages >
4.5V. The input capacitor can be increased without any limit for better input voltage filtering.
Take care when using only small ceramic input capacitors. When a ceramic capacitor is used at the input, and
the power is being supplied through long wires, such as from a wall adapter, a load step at the output or VIN step
on the input can induce ringing at the VIN pin. The ringing can couple to the output and be mistaken as loop
instability or could even damage the part by exceeding the maximum ratings
Table 2. List of Capacitors
CAPACITANCE
TYPE
SIZE
SUPPLIER
4.7
μF
GRM188R60J475K
0603: 1.6x0.8x0.8mm3
Murata
10
μF
GRM188R60J106M69D
0603: 1.6x0.8x0.8mm3
Murata
As for all switching power supplies, the layout is an important step in the design. Proper function of the device
demands careful attention to PCB layout. Care must be taken in board layout to get the specified performance. If
the layout is not carefully done, the regulator could show poor line and/or load regulation, stability issues as well
as EMI problems. It is critical to provide a low inductance, impedance ground path. Therefore, use wide and
short traces for the main current paths. The input capacitor should be placed as close as possible to the IC pins
as well as the inductor and output capacitor.
Connect the GND pin of the device to the PowerPAD land of the PCB and use this pad as a star point. Use a
common Power GND node and a different node for the Signal GND to minimize the effects of ground noise.
Connect these ground nodes together to the PowerPAD land (star point) underneath the IC. Keep the common
path to the GND pin, which returns the small signal components, and the high current of the output capacitors as
short as possible to avoid ground noise. The FB line should be connected right to the output capacitor and routed
away from noisy components and traces (e.g., SW line).
Copyright 2007, Texas Instruments Incorporated
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Product Folder Link(s): TPS62240 TPS62242 TPS62243
相关PDF资料 |
PDF描述 |
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| TPS62242 | 2.25MHz 300mA Step-Down Converter in 2x2mm SON/TSOT23 Package |
| TPS62243DRVRG4 | 2.25 MHz 300 mA Step Down Converter in 2x2SON/TSOT23 Package |
| TPS62243DRVR | 2.25 MHz 300 mA Step Down Converter in 2x2SON/TSOT23 Package |
| TPS62243DRVT | 2.25 MHz 300 mA Step Down Converter in 2x2SON/TSOT23 Package |
| TPS62243DRV | 2.25 MHz 300 mA Step Down Converter in 2x2SON/TSOT23 Package |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS62242DRVR | 功能描述:直流/直流开关调节器 2.25MHz 300mA Step- Down Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS62242DRVRG4 | 功能描述:直流/直流开关调节器 2.25MHz 300mA Step- Down Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS62242DRVT | 功能描述:直流/直流开关调节器 2.25MHz 300mA Step- Down Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS62242DRVTG4 | 功能描述:直流/直流开关调节器 2.25MHz 300mA Step- Down Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS62242QDDCRQ1 | 功能描述:开关变换器、稳压器与控制器 AC 2.25MHz 300mA SD Converter RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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