Datasheet

LP3997
www.ti.com SNVS272B –MAY 2004–REVISED MAY 2013
Electrical Characteristics (continued)
Unless otherwise noted, SD = 950mV, V
IN
= V
OUT
+ 1.0V, C
IN
= 2.2 µF, I
OUT
= 1 mA, C
OUT
= 2.2 µF and C
BYP
= 0.1 µF.
Typical values and limits appearing in normal type apply for T
J
= 27°C. Limits appearing in boldface type apply over the full
temperature range for operation, −40 to +125°C.
(1)
Limit
Symbol Parameter Test Conditions Typ Unit
Min Max
Timing Characteristics
t
ON
Turn On Time
(7)
To 95% Level w/o C
BYP
150 250 µs
C
BYP
= 0.1µF 2 ms
Transient Line Transient Response T
rise
= T
fall
= 30µs
(7)
w/o C
BYP
40
mV
Response |δV
OUT
| δV
IN
= 600mV
(pk - pk)
C
BYP
= 0.1µF 4
Load Transient Response T
rise
= T
fall
= 1µs
(7)
70 80 mV
|δV
OUT
| I
OUT
= 1mA to 150mA
(7) This electrical specification is ensured by design.
Output Capacitor, Recommended Specifications
Limit
Symbol Parameter Conditions Typ Unit
Min Max
C
o
Output Capacitor Capacitance
(1)
2.2 0.7 µF
ESR 5 500 mΩ
(1) The capacitor tolerance should be 30% or better over temperature. 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 capacitor characteristics section in Applications
Information).
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