TPS51427_12 Datasheet, PDF (24/41 Pages) Texas Instruments – DUAL D-CAP™ SYNCHRONOUS STEP-DOWN CONTROLLER FOR NOTEBOOK POWER RAILS

TPS51427
SLUS819B – APRIL 2008 – REVISED SEPTEMBER 2008................................................................................................................................................ www.ti.com
TYPICAL CHARACTERISTICS (continued)
FREQUENCY
vs
INPUT VOLTAGE
500
V_TONSEL (V)
GND
VREF2
400
V5FILT
V_TONSEL= GND
300
V_TONSEL= V_VREF2
200
V_TONSEL= V_V5FILT
100
5
10
15
20
25
V_IN – Input Voltage – V
Figure 29. Channel 1 (1.5-V Setting)
FREQUENCY
vs
OUTPUT CURRENT
350
CH1
300 V_IN = 19 V
V_TONSEL = GND
250
FREQUENCY
vs
INPUT VOLTAGE
600
V_TONSEL (V)
GND
500
VREF2
V5FILT
400
V_TONSEL= GND
300
200
V_TONSEL= V_VREF2
V_TONSEL= V_V5FILT
100
5
10
15
20
25
V_IN – Input Voltage – V
Figure 30. Channel 2 (1.05-V Setting)
FREQUENCY
vs
OUTPUT CURRENT
350
CH2
300 V_IN = 19 V
V_TONSEL = GND
250
200
150
Auto-Skip
100 _OOA
50
200
150
Auto-Skip
100 _OOA
50
0
0.001
0.01
0.1
1
10
I_OUT – Output Current – A
Figure 31. Load Current (5-V Setting)
0
0.001
0.01
0.1
1
10
I_OUT – Output Current – A
Figure 32. Load Current (3.3-V Setting)
24
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