isl9440b Intersil Corporation, isl9440b Datasheet - Page 11

• 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
5.25
5.00
4.75
4.50
4.25
4.00
12.10
12.08
12.06
12.04
12.02
12.00
11.98
11.96
11.94
11.92
11.90
3.36
3.35
3.34
3.33
3.32
3.31
3.30
0
0
0
FIGURE 4. PWM2 LOAD REGULATION
FIGURE 6. PWM3 LOAD REGULATION
V
IN
FIGURE 8. VCC_5V vs SUPPLY
= 5.0V
V
10
IN
V
IN
= 23V
V
4
4
IN
V
= 4.5V
LOAD CURRENT (A)
IN
= 24V
V
LOAD CURRENT (A)
LOAD CURRENT (A)
= 19V
V
IN
IN
20
= 15V
11
= 5V
8
8
V
IN
V
30
= 19V
IN
= 12V
(Continued)
V
IN
12
12
= 5.5V
40
ISL9440B, ISL9440C
16
50
16
IN
FIGURE 5. PWM2 EFFICIENCY vs LOAD (V
FIGURE 7. PWM3 EFFICIENCY vs LOAD (V
FIGURE 9. OPERATING CURRENT vs VIN
100
= 19V Unless Otherwise Noted).
95
90
85
80
75
70
65
60
100
95
90
85
80
75
70
65
60
5.0
4.5
4.0
3.5
3.0
0
0
4
V
IN
V
RJK0305DPB FOR UPPER MOSFET AND
RJK0301DPB FOR LOWER MOSFET
RJK0304DPB FOR UPPER MOSFET AND
RJK0301DPB FOR LOWER MOSFET
(RPG = RRST = 100kΩ, ROCSET = 121kΩ)
2
IN
= 23VDC
2
= 16VDC
7
V
IN
4
= 16VDC
V
10
IN
4
LOAD CURRENT (A)
= 19VDC
LOAD CURRENT (A)
INPUT VOLTAGE (V)
V
6
IN
= 19VDC
13
6
8
V
IN
16
= 23VDC
8
10
19
O
O
10
12
= 3.3V),
= 12V),
January 15, 2009
22
14
12
FN6799.0
16
25
14