isl9440b Intersil Corporation, isl9440b Datasheet - Page 12

• Manufacturer Part Number: isl9440b
• Description: Triple Step-down Pwm And Single Linear Controller With Programmable Soft-start
• Manufacturer: Intersil Corporation

Typical Performance Curves
(Oscilloscope Plots are Taken Using the ISL9440BEVAL1Z Evaluation Board, V
FIGURE 12. SHUTDOWN CURRENT vs V
FIGURE 14. PHASE NODE PWM WAVEFORMS, V
2.0
1.7
1.4
1.1
0.8
0.5
120
100
80
60
40
20
FIGURE 10. SOFT-START CURRENT vs VEN/SS
0
0
0
PWM3, 10V/DIV
FLOATING)
PWM2, 10V/DIV
5
1
V
IN
= 12V
10
12
VEN/SS (V)
V
IN
PWM1, 10V/DIV
(V)
2
15
IN
(Continued)
(PGOOD and RST
3
20
1.0µs/DIV
IN
ISL9440B, ISL9440C
= 24V
25
4
IN
FIGURE 13. PWM SOFT-START WAVEFORMS, CSS = 22nF
FIGURE 11. NORMALIZED OUTPUT VOLTAGE vs VEN/SS
= 19V Unless Otherwise Noted).
330
315
300
285
270
110
100
90
80
70
60
50
40
30
20
10
0
FIGURE 15. SWITCHING FREQUENCY vs V
5
1.00
1.25
10
V
IN
1.50
= 15V
V
IN
VEN/SS (V)
V
= 12V
IN
15
1.75
(V)
V
IN
= 24V
2.00
V
V
V
V
OUT4
OUT1
OUT2
OUT3
20
5.0ms/DIV
(LDO), 2.0V/DIV
, 2.0V/DIV
,2.0V/DIV
, 5.0V/DIV
January 15, 2009
2.25
IN
FN6799.0
25
2.50