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参数资料
| 型号： | LP3907SQ-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： | 13/44页 |
| 文件大小： | 3058K |
| 代理商： | LP3907SQ-JIXI |
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FLEXIBLE POWER SEQUENCING OF MULTIPLE POWER
SUPPLIES
The LP3907 provides several options for power on sequenc-
ing. The two bucks can be individually controlled with ENSW1
and ENSW2. The two LDOs can also be individually con-
trolled with ENLDO1 and ENLDO2.
If the user desires a set power on sequence, he can program
the chip through I2C and raise EN_T from LOW to HIGH to
activate the power on sequencing.
POWER UP SEQUENCING USING THE EN_T FUNCTION
EN_T assertion causes the LP3907 to emerge from Standby
mode to Full Operation mode at a preset timing sequence. By
default, the enables for the LDOs and Bucks (ENLDO1, ENL-
DO2, EN_T, ENSW1, ENSW2) are 500K internally pulled
down, which causes the part to stay OFF until enabled. If the
user wishes to use the preset timing sequence to power on
the regulators, transition the EN_T pin from Low to High. Oth-
erwise, simply tie the enables of each specific regulator HIGH
to turn on automatically.
EN_T is edge triggered with rising edge signaling the chip to
power on. The EN_T input is deglitched and the default is set
at 1ms. As shown in the next 2 diagrams, a rising EN_T edge
will start a power on sequence, while a falling EN_T edge will
start a shutdown sequence. If EN_T is high, toggling the ex-
ternal enables of the regulators will have no effect on the chip.
The regulators can also be programmed through I2C to turn
on and off. By default, I2C enables for the regulators on ON.
The regulators are on following the pattern below:
Regulators on = (I2C enable) AND (External pin enable OR
EN_T high).
30017809
www.national.com
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LP3907
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LP3907SQ-JXQX | 制造商:Texas Instruments 功能描述: |
| LP3907SQ-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 |
| LP3907SQ-JXQX/S7001874 | 制造商:Texas Instruments 功能描述:NSCLP3907SQ-JXQX@S7001874 1A&0.6A BUCKS |
| LP3907SQ-JXQXEV | 功能描述:LP3907 EVALUATION BOARD RoHS:否 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:PowerWise® 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| LP3907SQ-JXQXEV/NOPB | 功能描述:BOARD EVAL FOR LP3907 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:PowerWise® 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
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