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参数资料
| 型号： | LM10506TME |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA34 |
| 封装： | 0.40 MM PITCH, MICRO SMD-34 |
| 文件页数： | 24/34页 |
| 文件大小： | 1020K |
| 代理商： | LM10506TME |
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Output ripple can be estimated from the vector sum of the
reactive (capacitance) voltage component and the real (ESR)
voltage component of the output capacitor where:
where:
V
OUT-RIPPLE-PP:
estimated output ripple,
V
ROUT:
estimated real output ripple,
V
COUT
estimated reactive output ripple.
The device is designed to be used with ceramic capacitors on
the outputs of the buck regulators. The recommended dielec-
tric type of these capacitors is X5R, X7R, or of comparable
material to maintain proper tolerances over voltage and tem-
perature. The recommended value for the output capacitors
is 22
μF, 6.3V with an ESR of 2m or less. The output ca-
pacitors need to be mounted as close as possible to the
output/ground pins of the device.
TABLE 4. Recommended Output Capacitors
Model
Type
Vendor
Voltage Rating
Case Size
08056D226MAT2A
Ceramic, X5R
AVX Corporation
6.3V
0805, (2012)
C0805L226M9PACTU
Ceramic, X5R
Kemet
6.3V
0805, (2012)
ECJ-2FB0J226M
Ceramic, X5R
Panasonic - ECG
6.3V
0805, (2012)
JMK212BJ226MG-T
Ceramic, X5R
Taiyo Yuden
6.3V
0603, (1608)
C2012X5R0J226M
Ceramic, X5R
TDK Corporation
6.3V
0603, (1608)
21.2.3.2 Input Capacitor Selection
There are 3 buck regulators in the LM10506 device. Each of
these buck regulators has its own input capacitor which
should be located as close as possible to their corresponding
SWx_VIN and SWx_GND pins, where x designates Buck 1,
2 or 3. The 3 buck regulators operate at 120° out of phase,
which means that they switch on at equally spaced intervals,
in order to reduce the input power rail ripple. It is recommend-
ed to connect all the supply/ground pins of the buck regula-
tors, SWx_VIN to two solid internal planes located under the
device. In this way, the 3 input capacitors work together and
further reduce the input current ripple. A larger tantalum ca-
pacitor can also be located in the proximity of the device.
The input capacitor supplies the AC switching current drawn
from the switching action of the internal power FETs. The in-
put current of a buck converter is discontinuous, so the ripple
current supplied by the input capacitor is large. The input ca-
pacitor must be rated to handle both the RMS current and the
dissipated power.
The input capacitor must be rated to handle this current:
The power dissipated in the input capacitor is given by:
The device is designed to be used with ceramic capacitors on
the inputs of the buck regulators. The recommended dielectric
type of these capacitors is X5R, X7R, or of comparable ma-
terial to maintain proper tolerances over voltage and temper-
ature. The minimum recommended value for the input
capacitor is 10 F with an ESR of 10 m
or less. The input
capacitors need to be mounted as close as possible to the
power/ground input pins of the device.
The input power source supplies the average current contin-
uously. During the PFET switch on-time, however, the de-
manded di/dt is higher than can be typically supplied by the
input power source. This delta is supplied by the input capac-
itor.
A simplified “worst case” assumption is that all of the PFET
current is supplied by the input capacitor. This will result in
conservative estimates of input ripple voltage and capacitor
RMS current.
Input ripple voltage is estimated as follows:
where:
V
PPIN:
estimated peak-to-peak input ripple voltage,
I
OUT:
Output Current
C
IN:
Input capacitor value
ESR
CIN:
input capacitor ESR.
This capacitor is exposed to significant RMS current, so it is
important to select a capacitor with an adequate RMS current
rating. Capacitor RMS current estimated as follows:
I
RMSCIN:
estimated input capacitor RMS current.
www.national.com
30
LM10506
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相关代理商/技术参数 |
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|---|---|
| LM10506TME/NOPB | 功能描述:直流/直流开关转换器 Triple Buck & LDO Power Mgmt Unit 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 |
| LM10506TME-A | 制造商:TI 制造商全称:Texas Instruments 功能描述:Triple Buck LDO Power Management Unit |
| LM10506TME-A/NOPB | 功能描述:直流/直流开关转换器 Triple Buck & LDO Power Mgmt Unit 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 |
| LM10506TMX | 制造商:TI 制造商全称:Texas Instruments 功能描述:Triple Buck LDO Power Management Unit |
| LM10506TMX/NOPB | 功能描述:PMIC 解决方案 Triple Buck & LDO Power Mgmt Unit RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
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