Datasheet

LP3990
SNVS251I –MAY 2004–REVISED MAY 2013 www.ti.com
Electrical Characteristics (continued)
Unless otherwise noted, V
EN
=950mV, V
IN
= V
OUT
+ 1.0V, or 2.0V, whichever is higher. C
IN
= 1 µF, I
OUT
= 1 mA, C
OUT
=0.47
µF.
Typical values and limits appearing in normal type apply for T
J
= 27°C. Limits appearing in boldface type apply over the full
junction temperature range for operation, −40 to +125°C.
(1)
Limit
Symbol Parameter Conditions Typ Units
Min Max
Timing Characteristics
T
ON
Turn On Time
(8)
To 95% Level V
OUT
= 0.8 80 150
V
IN(MIN)
to 6.0V
V
OUT
= 1.5 105 200 µs
V
OUT
= 3.3 175 250
Transient Line Transient Response |δV
OUT
| T
rise
= T
fall
= 30µs
(8)
δV
IN
= 600mV mV
8 16
Response (pk - pk)
Load Transient Response |δV
OUT
| T
rise
= T
fall
= 1µs
(8)
I
OUT
= 1mA to 150mA
55 100 mV
C
OUT
= 1µF
(8) This electrical specification is guaranteed by design.
Output Capacitor, Recommended Specifications
Limit
Symbol Parameter Conditions Nom Units
Min Max
C
OUT
Output Capacitance Capacitance
(1)
1.0 0.7 µF
ESR 5 500 mΩ
(1) The full operating conditions for the application should be considered when selecting a suitable capacitor to ensure that the minimum
value of capacitance is always met. Recommended capacitor type is X7R. However, dependent on application, X5R, Y5V, and Z5U can
also be used. (See Application Hints)
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