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參數(shù)資料
| 型號(hào)： | LP2978IM5X-3.8 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | SUBMINIATURE PC BOARD RELAY |
| 中文描述： | 3.8 V FIXED POSITIVE LDO REGULATOR, 0.225 V DROPOUT, PDSO5 |
| 封裝： | SOT-23, SOP-5 |
| 文件頁(yè)數(shù)： | 6/7頁(yè) |
| 文件大小： | 102K |
| 代理商： | LP2978IM5X-3.8 |
Application Hints
(Continued)
It should also be noted that the ESR of a typical Tantalum will
increase about 2:1 as the temperature goes from 25C down
to 40C, so some guard band must be allowed.
ON/OFF INPUT OPERATION
The LP2978 is shut off by driving the ON/OFF input low, and
turned on by pulling it high. If this feature is not to be used,
the ON/OFF input should be tied to V
IN
to keep the regulator
output on at all times.
To assure proper operation, the signal source used to drive
the ON/OFF input must be able to swing above and below
the specified turn-on/turn-off voltage thresholds listed in the
Electrical Characteristics section under V
. To prevent
mis-operation, the turn-on (and turn-off) voltage signals ap-
plied to the ON/OFF input must have a slew rate which is
≥
40 mV/μs.
Caution:
the regulator output voltage can not be guaranteed
if a slow-moving AC (or DC) signal is applied that is in the
range between the specified turn-on and turn-off voltages
listed under the electrical specification V
ON/OFF
(see Electri-
cal Characteristics).
REVERSE INPUT-OUTPUT VOLTAGE
The PNP power transistor used as the pass element in the
LP2978 has an inherent diode connected between the regu-
lator output and input. During normal operation (where the
input voltage is higher than the output) this diode is
reverse-biased.
However, if the output is pulled above the input, this diode
will turn ON and current will flow into the regulator output. In
such cases, a parasitic SCR can latch which will allow a high
current to flow into V
IN
(and out the ground pin), which can
damage the part.
In any application where the output may be pulled above the
input, an external Schottky diode must be connected from
V
to V
(cathode on V
, anode on V
), to limit the re-
verse voltage across the LP2978 to 0.3V (see Absolute
Maximum Ratings).
L
www.national.com
6
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| LP2980-1.57BUP6 WAF | 制造商:Texas Instruments 功能描述: |
| LP2980-3.3BUP6 WAF | 制造商:Texas Instruments 功能描述: |
| LP2980AIBP-3.3 | 制造商:Rochester Electronics LLC 功能描述:50MA LDO REG IN MICRO SMD - Bulk 制造商:Texas Instruments 功能描述: |
| LP2980AIBP-3.3/NOPB | 功能描述:IC REG LDO 3.3V 50MA 5USMD RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:4V 輸入電壓:最高 16V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.28V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA 電流 - 限制（最?。?- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:5-VFBGA 供應(yīng)商設(shè)備封裝:5-uSMD 包裝:Digi-Reel® 其它名稱:LP2985AIBP-4.0DKR |
| LP2980AIBP-5.0 | 功能描述:IC REG LDO 5V 50MA 5USMD RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:4V 輸入電壓:最高 16V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.28V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA 電流 - 限制（最?。?- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:5-VFBGA 供應(yīng)商設(shè)備封裝:5-uSMD 包裝:Digi-Reel® 其它名稱:LP2985AIBP-4.0DKR |
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