Datasheet

V
CC
PLUS BOOT CURRENT
0
5
10
15
20
25
30
35
40
100300 500 700 90011001300150017001900
PWM FREQUENCY (kHz)
10
15
20
25
30
900
1000
11001200
1300
1400
1500
1600
1700
1800
1900
PWM FREQUENCY (kHz)
RF-ADJ (k:)
PWM FREQUENCY (kHz)
RF-ADJ (k:)
0
100
200
300
400
500
100 150
200
250
300350400
450
500600
700
800
LM2742
www.ti.com SNVS266C –MARCH 2004–REVISED MARCH 2013
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
RFADJ vs PWM Frequency R
FADJ
vs PWM Frequency
(in 100 to 800kHz range), T
A
= 25°C (in 900 to 2000kHz range), T
A
= 25°C
Figure 9. Figure 10.
Switch Waveforms (HG Falling)
V
CC
Operating Current Plus Boot Current vs V
IN
= 5V, V
O
= 1.8V
PWM Frequency (Si4826DY FET, T
A
= 25°C) I
O
= 3A, C
SS
= 10nF, F
SW
= 600kHz
Figure 11. Figure 12.
Switch Waveforms (HG Rising) Start-Up (No-Load)
V
IN
= 5V, V
O
= 1.8V V
IN
= 10V, V
O
= 1.2V
I
O
= 3A, F
SW
= 600kHz C
SS
= 10nF, F
SW
= 300kHz
Figure 13. Figure 14.
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