參數(shù)資料
型號(hào)： LP3907SQ-JIXI
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 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)： 29/44頁(yè)
文件大小： 3058K
代理商： LP3907SQ-JIXI
BUCK FUNCTION REGISTER (BFCR) – 0x38
This register allows the Buck switcher clock frequency to be
spread across a wider range, allowing for less Electro-mag-
netic Interference (EMI). The spread spectrum modulation
frequency refers to the rate at which the frequency ramps up
and down, centered at 2MHz.
30017825
This register also allows dynamic scaling of the nPOR Delay
Timing. The LP3907 is equipped with an internal Power-On-
Reset (“POR”) circuit which monitors the output voltage levels
on the buck regulators, allowing the user to more actively
monitor the power status of the chip.
The Under Voltage Lock-Out feature continuously monitor the
raw input supply voltage (VINLDO12) and automatically dis-
ables the four voltage regulators whenever this supply voltage
is less than 2.8VDC. This prevents the user from damaging
the power source (i.e. battery), but can be disabled if the user
wishes.
Note that if the supply to VDD_M is close to 2.8V with a heavy
load current on the regulators, the chip is in danger of pow-
ering down due to UVLO. If the user wishes to keep the chip
active under those conditions, enable the “Bypass UVLO”
feature.
D7-2
D4
D3
D1
D0
Name
—
BP_UVLO
TPOR
BK_SLOMOD
BK_SSEN
Access
—
R/W
R/w
R/W
Data
Reserved
Bypass UVLO
monitoring
0 - Allow UVLO
1 - Disable UVLO
nPOR Delay Timing
00 - 50s
01 - 50ms
10 - 100ms
11 - 200ms
Buck Spread Spectrum
Modulation
0 – 10 kHz triangular wave
1 – 2 kHz triangular wave
Spread Spectrum
Function Output
0 – Disabled
1 – Enabled
Reset
000
0
01
1
0
35
www.national.com
LP3907
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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 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969
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