TPS51427A Datasheet, PDF (18/42 Pages) Texas Instruments – DUAL D-CAP™ SYNCHRONOUS STEP-DOWN CONTROLLER FOR NOTEBOOK POWER RAILS

TPS51427A
SLUS843B – MAY 2008 – REVISED SEPTEMBER 2008 .................................................................................................................................................. www.ti.com
TYPICAL CHARACTERISTICS (continued)
EFFICIENCY
vs
OUTPUT CURRENT
100
CH1
PWM Mode
80
V_TONSEL = V5FILT
EFFICIENCY
vs
OUTPUT CURRENT
100
CH2
PWM Mode
80
V_TONSEL = V5FILT
60
40
20
0
0.001
V_IN (V)
8
12
20
0.01
0.1
1
10
I_OUT – Output Current – A
Figure 5. 5-V Efficiency in PWM Mode
OUTPUT VOLTAGE
vs
INPUT VOLTAGE
5.14
OOA, 0 A
5.13
5.12
5.11 Auto-skip, 0A
5.10
5.09
PWM Only, 0 A
5.08
5.07
OOA, 8 A
5.06
5.05
5.04
5.03
5
PWM Only, 8 A
10
15
OOA, 8 A
Auto-skip, 8 A
20
25
V_IN – Input Voltage – V
Figure 7. 5-V Line Regulation
60
40
20
0
0.001
V_IN (V)
8
12
20
0.01
0.1
1
10
I_OUT – Output Current – A
Figure 6. 3.3-V Efficiency in PWM Mode
OUTPUT VOLTAGE
vs
INPUT VOLTAGE
3.42
3.40
3.38
3.36
3.34
3.32
3.30
3.28
3.26
3.24
3.22
3.20
5
OOA, 0 A
Auto-skip, 0A
Auto-skip, 8 A
OOA, 8 A
PWM Only, 8 A
Mode, I_OUT (A)
Auto-skip, 8 A
Auto-skip, 0A
OOA, 8 A
OOA, 0 A
PWM Only, 8A
PWM Only, 0A
10
15
20
25
V_IN – Input Voltage – V
Figure 8. 3.3-V Line Regulation
18
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