LP38842-ADJ_15 Datasheet, PDF (5/15 Pages) Texas Instruments – 1.5A Ultra Low Dropout Adjustable Linear Regulators Stable with Ceramic Output Capacitors

LP38842-ADJ
www.ti.com
SNVS304A – FEBRUARY 2005 – REVISED APRIL 2013
TYPICAL PERFORMANCE CHARACTERISTICS
Unless otherwise specified: T_J = 25°C, C_IN = 10 µF CER, C_OUT = 22 µF CER, C_BIAS = 1 µF CER, S/D Pin is tied to V_BIAS, V_OUT
= 1.2V, I_L = 10mA, V_BIAS = 5V, V_IN = V_OUT + 1V.
V_BIAS Transient Response
Load Transient Response
6
V_BIAS
5
4
2
I_LOAD
1
0
10
V_OUT
0
I_L = 10 mA
-10
V_OUT = 1.2V
V_IN = 1.7V
20 Ps/DIV
Figure 1.
50
V_OUT
0
-50
V_OUT = 0.8V
C_OUT = 22 PF Cer
50 Ps/DIV
Figure 2.
Load Transient Response
2
I_LOAD
1
0
Dropout Voltage Over Temperature
200
VBIAS = 5V
125^oC
160
120
25^oC
50
0
-50
100
90
_
80
_
70
_
60
_
50
_
40
_
30
_
20
_
10
_
0
1000
V_OUT
C_OUT = 4.7 PF Tantalum
V_OUT = 0.8V
50 Ps/DIV
Figure 3.
V_BIAS PSRR
C_OUT = 4.7 PF Tantalum
I_LOAD = 10 mA
10000
_
100000
_
FREQUENCY (Hz)
Figure 5.
1000000_
80
-40^oC
40
0
0
0.5
1.0
1.5
LOAD CURRENT (A)
Figure 4.
100
90
80
70
60
50
40
30
20
10
0
100
V_BIAS PSRR
C_BIAS = 1 PF Tantalum
I_L = 0
V_OUT = 1.2V
1000 10000 100000 1000000
FREQUENCY (Hz)
Figure 6.
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