ISL78228ARZ INTERSIL [Intersil Corporation], ISL78228ARZ Datasheet - Page 10

• Manufacturer Part Number: ISL78228ARZ
• Description: Dual 800mA Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator
• Manufacturer: INTERSIL [Intersil Corporation]

Typical Operating Performance
V
0A to 800mA. (Continued)
IN
50µs/DIV
= 2.75V to 5.5V, EN = V
50µs/DIV
FIGURE 26. SOFT-START AT NO LOAD CHANNEL 1 (PFM)
FIGURE 30. SOFT-DISCHARGE SHUTDOWN CHANNEL 1
FIGURE 28. SOFT-START AT FULL LOAD CHANNEL 1
IN
, L
1
10
= L
2
= 2.2µH, C
V
V
OUT1
V
1
OUT1
I
OUT1
IL 0.5A/DIV
I
EN1 5V/DIV
I
L1
= 10µF, C
EN1 2V/DIV
EN1 2V/DIV
L1
L
PG 5V/DIV
PG 5V/DIV
1ms/DIV
PG 5V/DIV
0.5A/DIV
0.5A/DIV
0.5A/DIV
1V/DIV
1V/DIV
1V/DIV
2
ISL78228
= C
4
= 10µF, V
Unless otherwise noted, operating conditions are: T
OUT1
50µs/DIV
EN2 2V/DIV
PG 5V/DIV
I
PG 5V/DIV
50µs/DIV
I
L2
EN2 5V/DIV
FIGURE 27. SOFT-START AT NO LOAD CHANNEL 2 (PFM)
L2
FIGURE 31. SOFT-DISCHARGE SHUTDOWN CHANNEL 2
= 2.5V, V
FIGURE 29. SOFT-START AT FULL LOAD CHANNEL 2
0.5A/DIV
0.5A/DIV
OUT2
V
OUT2
= 1.8V, I
0.5V/DIV
V
OUT2
OUT1
0.5V/DIV
= I
OUT2
=
V
A
OUT2
= +25°C,
I
EN2 2V/DIV
L2
PG 5V/DIV
0.5A/DIV
0.5V/DIV
1ms/DIV
May 2, 2011
FN7849.0