Datasheet

TIME 400 µs/Div
TPS5 1225CEVM-133
5 V 2.5 V Pre-bias
Enable Start-up
OUT
Test Condition:
12 V , 5 V/0 A, 3.3 V/0 A
IN
CH1: EN1 and EN2
CH2: 5 V
OUT
CH3: 3.3 V
OUT
CH4: PGOOD
TIME 400 µs/Div
TPS5 1225CEVM-133
3.3 V 2 V Pre-bias
Enable Start-up
OUT
Test Condition:
12 V , 5 V/0 A, 3.3 V/0 A
IN
CH1: EN1 and EN2
CH2: 5 V
OUT
CH3: 3.3 V
OUT
CH4: PGOOD
TIME 40 µs/Div
TPS5 1225CEVM-133
3.3 V Output Transient
from DCM to CCM
OUT
Test Condition:
12 V , 5 V/0 A, 3.3 V/0 A-5 A
IN
CH1: 3.3 V Output
OUT
CH2: 3.3 V Current
OUT
TIME 40 µs/Div
TPS5 1225 EVM-133
3.3 V Output Transient
from to
OUT
CCM DCM
Test Condition:
12 V , 5 V/0 A, 3.3 V/0 A-5 A
IN
CH1: 3.3 V Output
OUT
CH2: 3.3 V Current
OUT
www.ti.com Performance Data and Typical Characteristic Curves
7.9 3.3-V Output Transient with Auto-skip Mode
Figure 16. 3.3-V Output Transient from DCM to CCM Figure 17. 3.3-V Output Transient from CCM to DCM
7.10 Output Prebias Turn on
Figure 18. 5-V Output, 2.5-V Prebias Start up Figure 19. 3.3-V Output, 2-V Prebias Start up
13
SLVU735–June 2012 Dual Synchronous Step-Down Fixed Output Controller with 5-V and 3.3-V
LDOs
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