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| 型号： | LM3686TLE-AADW/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 19/27页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC .9A TRPL 12USMD |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 3 |
| 输出电压： | 1.2V，1.8V，2.8V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流/电压模式 |
| 频率 - 开关： | 3MHz |
| 电流 - 输出： | 900mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WFBGA |
| 包装： | 标准包装 |
| 供应商设备封装： | 12-uSMD |
| 产品目录页面： | 1288 (CN2011-ZH PDF) |
| 其它名称： | LM3686TLE-AADW/NOPBDKR LM3686TLE-AADWDKR LM3686TLE-AADWDKR-ND |
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SNVS520E – AUGUST 2008 – REVISED MAY 2013
Because these two components are out of phase, the rms (root mean squared) value can be used to get an
approximate value of peak-to-peak ripple. The peak-to-peak ripple voltage, rms value can be expressed as
follow:
V PP-RMS =
V PP-C2 + V PP-ESR2
(6)
Note that the output voltage ripple is dependent on the inductor current ripple and the equivalent series
resistance of the output capacitor (R ESR ). The R ESR is frequency dependent (as well as temperature dependent);
make sure the value used for calculations is at the switching frequency of the part.
C OUT_LILO
The linear regulator is designed specifically to work with very small ceramic output capacitors. A ceramic
capacitor (dielectric types X7R, Z5U, or Y5V) in the 2.2 μF range (up to 10 μF) and with an ESR between 3 m ?
to 300 m ? is suitable as C OUT_LIN in the LM3686 application circuit.
This capacitor must be located a distance of not more than 1cm from the V OUT_LILO pin and returned to a clean
analogue ground. It is also possible to use tantalum or film capacitors at the device output, V OUT_LILO but these
are not as attractive for reasons of size and cost (see Table 2 ).
C OUT_LDO
A ceramic capacitor in the 1 uF to 2.2 uF range, and with ESR between 5 m ? to 500 m ? , is suitable for the
linear regulator. This output capacitor should be connected no more than 1 cm from V OUT_LDO and QGND
100%
0603, 10V, X5R
80%
60%
0402, 6.3V, X5R
40%
20%
0
1.0
2.0
3.0
4.0
5.0
DC BIAS (V)
Figure 24. Graph Showing a Typical Variation In Capacitance vs. DC Bias
Table 2. Suggested Capacitors and their Suppliers
Capacitance / μF
10.0
4.7
2.2
1.0
Model
C1608X5R0J106K
C1608X5R0J475
C1608X5R0J225M
C1005JB0J105KT
Voltage Rating
6.3V
6.3V
6.3V
6.3V
Vendor
TDK
TDK
TDK
TDK
Type
Ceramic, X5R
Ceramic, X5R
Ceramic, X5R
Ceramic, X5R
Case Size / Inch (mm)
0603 (1608)
0603 (1608)
0603 (1608)
0402 (1005)
DSBGA Package Assembly And Use
Use of the DSBGA package requires specialized board layout, precision mounting and careful re-flow
techniques, as detailed in the TI AN-1112 Application Report ( SNVA009 ). Refer to the section "Surface Mount
Technology (SMD) Assembly Considerations". For best results in assembly, alignment ordinals on the PC board
should be used to facilitate placement of the device. The pad style used with DSBGA package must be the
NSMD (non-solder mask defined) type. This means that the solder-mask opening is larger than the pad size.
This prevents a lip that otherwise forms if the soldermask and pad overlap, from holding the device off the
Copyright ? 2008–2013, Texas Instruments Incorporated
Product Folder Links: LM3686
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM3686TLE-AAED | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Linear Regulator |
| LM3686TLE-AAED/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 |
| LM3686TLE-AAEF | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Linear Regulator |
| LM3686TLE-AAEF/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 |
| LM3686TLX-AADW | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Linear Regulator |
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