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參數(shù)資料
| 型號(hào)： | LP3928 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | High Speed Bi-Directional Level Shifter and Ultra Low-Dropout CMOS Voltage Regulator |
| 中文描述： | 高速雙向電平轉(zhuǎn)換器和超低壓差CMOS電壓穩(wěn)壓器 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大小： | 240K |
| 代理商： | LP3928 |
Application Hints
(Continued)
NO-LOAD STABILITY
The LDO of the LP3928 will remain stable and in regulation
with no external load connected to the LDO output V
CCB
.
This is especially important in CMOS RAM keep-alive appli-
cations.
LEVEL SHIFTER DIRECTION CONTROL AND LATCH
CLOCK
The direction of the level shifter is set to Ax
→
Bx by pulling
the DIRx pin to high. The direction of each of the three
channels can be set individually. In this mode a change at
the LatchClk pin has no effect.
A low at the DIRx pin sets the direction to Bx
→
Ax. If EN2 is
set to high (enabling latch mode), a rising edge of LatchClk
will update Ax depending on the level at Bx. A falling edge of
LatchClk will not change Ax.
MICRO SMD ASSEMBLY
For assembly recommendations of micro SMD package
please refer to National Semiconductor Application Note
AN-1112.
MICRO SMD LIGHT SENSITIVITY
Exposing the micro SMD device to direct sunlight will cause
misoperation of the device. Light sources such as Halogen
lamps can effect electrical performance if brought near to the
device.
The wavelengths which have most detrimental effect are
reds and infra-reds, which means that the fluorescent light-
ing used inside most buildings has very little effect on per-
formance.
A micro SMD test board was brought to within 1 cm of a
fluorescent desk lamp and the effect on the regulated output
voltage was negligible, showing a deviation of less thanTBD
from nominal.
OPERATION MODES, EN1 AND EN2
The output of the LDO (V
CCB
) is turned off and the level
shifter channels are set to a high Z state by pulling the
enable input pins EN1 and EN2 low.
EN1=0 and EN2=1 turns the LDO on and the level shifter
off.
EN1=1 and EN2=0 turns the LDO on and the latch of the
level shifter is bypassed in B to A direction. The Latch Clock
is not used in this mode. The LatchClk pin should not be left
floating but actively terminated.
EN1=1 and EN2=1 turns the LDO on and activates the latch
in B to A direction.
To assure proper operation, the signal source used to drive
the EN input pins must be able to swing above and below the
specified turn-on/off voltage thresholds listed in the Electrical
Characteristics section under Level Shifter DC Voltage Lev-
els.
Both pins, EN1 and EN2 must be actively terminated.
L
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP3928TL-1828 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LP3928TL-1828/NOPB | 功能描述:IC REG L-SHIFT 1.8-285V 16USMD RoHS:是 類別:集成電路 (IC) >> 邏輯 - 變換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 邏輯功能:變換器，雙向 位數(shù):2 輸入類型:CMOS 輸出類型:CMOS 數(shù)據(jù)速率:16Mbps 通道數(shù):2 輸出/通道數(shù)目:1 差分 - 輸入:輸出:無/無 傳輸延遲（最大）:15ns 電源電壓:1.65 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 封裝/外殼:10-UFQFN 供應(yīng)商設(shè)備封裝:10-UTQFN（1.4x1.8） 包裝:管件 |
| LP3928TLX-1828 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Speed Bi-Directional Level Shifter and Ultra Low-Dropout CMOS Voltage Regulator |
| LP3928TLX-1828/NOPB | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP3929 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:High Speed Bi-Directional Level Shifter and Ultra Low-Dropout CMOS Voltage Regulator and Line Protection |
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