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| 型号： | LM26480SQ-BF/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 2.4 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, QCC24 |
| 封装： | 4 X 4 MM, 0.80 MM HEIGHT, LLP-24 |
| 文件页数： | 13/30页 |
| 文件大小： | 2447K |
| 代理商： | LM26480SQ-BF/NOPB |
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Design Implementation of the Flexible Power-On Reset
30040409
Design implementation of the flexible power-on reset. An in-
ternal power-on reset of the IC is used with EN1 and EN2 to
produce a reset signal (LOW) to the delay timer nPOR. EN1
and RDY1 or EN2 and RDY2 are used to generate the set
signal (HIGH) to the delay timer. S=R=1 never occurs. The
mask timers are triggered off EN1 and EN2 which are gated
with RDY1, and RDY2 to generate outputs to the final AND
gate to generate the nPOR.
UNDER VOLTAGE LOCK OUT
The LM26480 features an “under voltage lock out circuit”. The
function of this circuit is to continuously monitor the raw input
supply voltage (VINLDO12) and automatically disables the
four voltage regulators whenever this supply voltage is less
than 2.8 VDC.
The circuit incorporates a bandgap based circuit that estab-
lishes the reference used to determine the 2.8 VDC trip point
for a V
IN OK – Not OK detector. This VIN OK signal is then
used to gate the enable signals to the four regulators of the
LM26480. When VINLDO12 is greater than 2.8 VDC the four
enables
control the four regulators, when VINLDO12 is less
than 2.8 VDC the four regulators are disabled by the V
IN de-
tector being in the “Not OK” state. The circuit has built in
hysteresis to prevent chattering occurring.
www.national.com
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LM26480
相关PDF资料 |
PDF描述 |
|---|---|
| LM26480SQX-BF/NOPB | 2.4 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, QCC24 |
| LM2661M/NOPB | SWITCHED CAPACITOR CONVERTER, 80 kHz SWITCHING FREQ-MAX, PDSO8 |
| LM2660MMX/NOPB | SWITCHED CAPACITOR CONVERTER, 40 kHz SWITCHING FREQ-MAX, PDSO8 |
| LM2661MM/NOPB | SWITCHED CAPACITOR CONVERTER, 80 kHz SWITCHING FREQ-MAX, PDSO8 |
| LM2661MMX/NOPB | SWITCHED CAPACITOR CONVERTER, 80 kHz SWITCHING FREQ-MAX, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM26480SQX-AA | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Externally Programmable Dual High-Current Step-Down DC/DC and Dual Linear Regulators |
| LM26480SQX-AA/NOPB | 功能描述:PMIC 解决方案 RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| LM26480SQX-BF | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Externally Programmable Dual High-Current Step-Down DC/DC and Dual Linear Regulators |
| LM26480SQX-BF/NOPB | 功能描述:直流/直流开关调节器 Externally Pgrm Dual Hi-Current SD DC/DC 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 |
| LM26484 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Power Management Unit |
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