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| 型号： | LP3907SQX-JIXI |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A DUAL SWITCHING CONTROLLER, 2100 kHz SWITCHING FREQ-MAX, QCC24 |
| 封装： | 4 X 4 MM, 0.8 MM HEIGHT, LLP-24 |
| 文件页数： | 16/44页 |
| 文件大小： | 3058K |
| 代理商： | LP3907SQX-JIXI |
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Flexible Power-On Reset (i.e., Power
Good with delay)
The LP3907 is equipped with an internal Power-On-Reset
(“POR”) circuit which monitors the output voltage levels on
bucks 1 and 2. The nPOR is an open drain logic output which
is logic LOW when either of the buck outputs are below 91%
of the rising value , or when one or both outputs fall below
82% of the desired value. The time delay between output
voltage level and nPOR is enabled is (50s, 50ms, 100ms,
200ms) 50ms by default. The system designer can choose
the external pull-up resistor (i.e. 100k
) for the nPOR pin.
NPOR With Counter Delay
30017821
The above diagram shows the simplest application of the
Power On Reset, where both switcher enables are tied to-
gether. In Case 1, EN1 causes nPOR to transition LOW and
triggers the nPOR delay counter. If the power supply for
Buck2 does not come on within that period, nPOR will stay
LOW, indicating a power fail mode. Case 2 indicates the vice
versa scenario if Buck1 supply did not come on. In both cases
the nPOR remains LOW.
Case 3 shows a typical application of the Power On Reset,
where both switcher enables are tied together. Even if RDY1
ramps up slightly faster than RDY2 (or vice versa), then nPOR
signal will trigger a programmable delay before going HIGH,
as explained below.
23
www.national.com
LP3907
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LP3907SQX-JXQX | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Dual High-Current Step-Down DC/DC and Dual Linear Regulator with I2C Compatible Interface |
| LP3907SQX-JXQX/NOPB | 功能描述:其他电源管理 RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
| LP3907SQX-PFX6W/NOPB | 功能描述:低压差稳压器 - LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| LP3907SQX-PJXIX/NOPB | 功能描述:低压差稳压器 - LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| LP3907SQX-PXPP | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Dual High-Current Step-Down DC/DC and Dual Linear Regulator with I2C Compatible Interface |
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