Datasheet

V
SW
I
L
2 ms/Div
2V/Div
20 mV/Div, AC coupled
100 mA/Div
V
OUT
10 mA/Div
I
OUT
V
SW
EN
I
L
5 ms/Div
2V/Div
1V/Div
100 mA/Div
V
OUT
0.5V/Div
0V
-5.5V
0V
-5.5V
V
SW
I
L
2 µs/Div
5V/Div
200 mA/Div
V
OUT
5 mV/Div
AC coupled
V
SW
I
L
2 µs/Div
5V/Div
200 mA/Div
V
OUT
10 mV/Div, AC coupled
V
SW
I
L
500 µs/Div
2V/Div
100 mA/Div
V
OUT
1V/Div
EN
1V/Div
V
SW
I
L
500 µs/Div
2V/Div
100 mA/Div
V
OUT
1V/Div
EN
1V/Div
LMR70503
SNVS850A –JUNE 2012–REVISED APRIL 2013 www.ti.com
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Unless otherwise specified, the following conditions apply: V
IN
= 3.3 V, V
OUT
= -5.0 V, V
EN
= 1.8 V, C
IN
= 10 µF 6.3 V X5R
ceramic capacitor; C
OUT
= 2 × 22 µF 6.3 V X5R ceramic capacitor; L = 6.8 µH (VLS2012ET-6R8M); T
AMBIENT
= 25 °C.
Soft Start And Soft Off Waveform Soft Start And Soft Off Waveform
V
IN
= 5.0 V, V
OUT
= -5.0 V, No Load V
IN
= 5.0 V, V
OUT
= -5.0 V, Load = 50 Ω
Figure 23. Figure 24.
Typical Switching Waveform Typical Switching Waveform
V
IN
= 5.0 V, V
OUT
= -5.0 V, No Load V
IN
= 5.0 V, V
OUT
= -5.0 V, I
OUT
= 70 mA
Figure 25. Figure 26.
Load Transient, V
IN
= 4.0 V, V
OUT
= -5.5 V Short Circuit Waveform
Load steps between 2 mA and 50 mA V
IN
= 5.0 V, V
OUT
= -5.5 V
Figure 27. Figure 28.
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