參數(shù)資料
型號(hào)： LP3907SQ-JIXI
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 1.5 A DUAL SWITCHING CONTROLLER, 2100 kHz SWITCHING FREQ-MAX, QCC24
封裝： 4 X 4 MM, 0.8 MM HEIGHT, LLP-24
文件頁(yè)數(shù)： 16/44頁(yè)
文件大?。?/td> 3058K
代理商： LP3907SQ-JIXI
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
相關(guān)PDF資料
PDF描述
LP3918TL-I 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA25
LP3923TLX 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA30
LP3923TLX-VB 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA30
LP3923TL-VB 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA30
LP3923TLX-VC 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA30
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LP3907SQ-JXQX 制造商:Texas Instruments 功能描述:
LP3907SQ-JXQX/NOPB 功能描述:其他電源管理 RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝: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 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC（離線）SMPS 系列:PowerWise® 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類(lèi)型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開(kāi)關(guān):3MHz 板類(lèi)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 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC（離線）SMPS 系列:PowerWise® 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類(lèi)型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開(kāi)關(guān):3MHz 板類(lèi)型:完全填充 已供物品:板 已用 IC / 零件:MAX8969
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