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參數(shù)資料
| 型號： | LP2978 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Micropower SOT, 50 mA Low-Noise Ultra Low-Dropout Regulator |
| 中文描述： | 微采用SOT，50毫安低噪聲超低壓差穩(wěn)壓器 |
| 文件頁數(shù)： | 6/7頁 |
| 文件大?。?/td> | 102K |
| 代理商： | LP2978 |
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LP2978AIM5-3.8 | Micropower SOT, 50 mA Low-Noise Ultra Low-Dropout Regulator |
| LP2978AIM5X-3.8 | SUBMINIATURE PC BOARD RELAY |
| LP2978IM5-3.8 | SUBMINIATURE PC BOARD RELAY |
| LP2978IM5X-3.8 | SUBMINIATURE PC BOARD RELAY |
| LP2980AIM5X-5.0 | Micropower 50 mA Ultra Low-Dropout Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP2978AY-3.8 WAF | 制造商:Texas Instruments 功能描述: |
| LP2978IM5-3.8 | 制造商:Rochester Electronics LLC 功能描述:50MA LDO REGULATOR, LOW-NOISE - Bulk 制造商:Texas Instruments 功能描述: |
| LP2978IM5X-3.8 | 制造商:Rochester Electronics LLC 功能描述:50MA LDO REGULATOR, LOW-NOISE - Bulk 制造商:Texas Instruments 功能描述: |
| 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: |
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