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| 型号： | LM3686TLE-AAED/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 16/27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-AAED/NOPBDKR LM3686TLE-AAEDDKR LM3686TLE-AAEDDKR-ND |
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SNVS520E – AUGUST 2008 – REVISED MAY 2013
Soft Start
The DC-DC converter has a soft-start circuit that limits in-rush current during start-up. During start-up the switch
current limit is increased in steps. Soft start is activated only if EN_DCDC goes from logic low to logic high after
V BATT reaches 2.7V. Soft start is implemented by increasing switch current limit in steps of 200 mA, 400 mA, 600
mA and 1220 mA (typical switch current limit). The start-up time thereby depends on the output capacitor and
load current demanded at start-up. Typical start-up times with a 10 μF output capacitor and 200 mA load is 350
μs and with 1 mA load is 200 μs.
LINEAR REGULATOR OPERATION (LILO)
In the typical post regulation application the power input voltage V IN_LILO for the linear regulator is generated by
the DC-DC converter. Using a buck converter to reduce the battery voltage to a lower input voltage for the linear
regulator translates to higher efficiency and lower power dissipation.
It's also possible to operate the linear regulator independent of the DC-DC converter output voltage either from
V IN_LDO/ V BATT or from a different source (V IN_LILO ) - (I OUT_LILO = 50 mA max in independent mode).
An input capacitor of 1 μF at V IN_LILO is needed to be added if no other filter or bypass capacitor is present in the
V IN_LILO path.
Startup Mode
If V IN_LILO > V OUT_LILO(NOM) + 250 mV the main regulator is active, offering a rated output current of 350 mA and
supplied by V IN_LILO . (Large NMOS)
If V IN_LILO < V OUT_LILO(NOM) + 150 mV the startup LILO is active, providing a reduced rated output current of 50 mA
typical, supplied by V BATT . (Small NMOS)
Figure 23. Startup Sequence, V EN_DCDC = V EN_LILO = V EN_LDO = V BATT
Current Limiting (LDO and LILO)
The LM3686 incorporates also a current limit for the LDO and LILO to protect itself and external components
during overload conditions at their outputs. In the event of a peak over-current condition at V OUT_LDO or V OUT_LILO
the output current through the NFET pass device will be limited.
16
Product Folder Links: LM3686
Copyright ? 2008–2013, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LM3686TLX-AADW/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-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 |
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