Datasheet

0
1
2
3
4
5
6
7
8
9
10
0
20 ms/div
V
IN
, V
DC−DC_OUT
, V
OUT
(V)
V
IN
V
DC−DC_OUT
V
OUT
V
EN
= V
IN
V
LDOEN
= V
DC−DC_OUT
G017
470
475
480
485
490
−40 −25 −10 5 20 35 50 65 80 95 110 125
Temperature (°C)
f
SW
− Oscillator Frequency (dB)
G018
0
1
2
3
4
5
0
10 ms/div
V
EN
, V
OUT
(V)
EN
OUT
R
LOAD
= 33 Ω
G016
0
0
0.5
1
1.5
2
−0.13
−0.11
−0.09
−0.07
−0.05
−0.03
−0.01
0.01
0.03
10 µs/div
I
OUT
(A)
V
OUT
Deviation (V)
I
OUT
= 100 mA to 1 A to 100 mA (1 A/µs)
V
OUT
Deviation
G015
1
10
100
1000
1 10 100 1k
C
NR
(nF)
From V
IN
(= EN) to 90% V
OUT
(ms)
R
LOAD
= 33 Ω
C
SS
= 0.01 µF
G013
0
6
8
10
12
14
16
18
19
−0.1
−0.08
−0.06
−0.04
−0.02
0
0.02
50 µs/div
V
IN
(V)
V
OUT
Deviation (V)
V
IN
= 7 V to 12 V to 7 V (1 V/µs)
V
OUT
Deviation
G014
TPS54120
www.ti.com SBVS180C –JANUARY 2012–REVISED JUNE 2012
TYPICAL CHARACTERISTICS (continued)
At V
(PVIN)
= V
(VIN)
= 12 V, V
(LDOIN)
= DC-DC_OUT = 4.1 V, V
(OUT)
= 3.3 V, I
(OUT)
= 10 mA, V
(EN)
= floating, C
OUT
= 100 μF, and
C
SS
= C
NR
= 0.01µF (see Figure 28), unless otherwise noted.
START-UP TIME
vs LDO NOISE-REDUCTION CAPACITANCE LINE TRANSIENT RESPONSE
Figure 13. Figure 14.
LOAD TRANSIENT RESPONSE ENABLE PULSE RESPONSE
Figure 15. Figure 16.
OSCILLATOR FREQUENCY
POWER-UP/POWER-DOWN RESPONSE vs TEMPERATURE
Figure 17. Figure 18.
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