ISL78228ARZ INTERSIL [Intersil Corporation], ISL78228ARZ Datasheet - Page 9

• 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
= 2.75V to 5.5V, EN = V
EN1 2V/DIV
I
PG 5V/DIV
50µs/DIV
FIGURE 24. SOFT-START WITH NO LOAD CHANNEL 1 (PWM)
V
50µs/DIV
L1
50µs/DIV
OUT1
0.5A/DIV
FIGURE 20. LOAD TRANSIENT CHANNEL 1 (PWM)
FIGURE 22. LOAD TRANSIENT CHANNEL 1 (PFM)
1V/DIV
V
V
OUT1
OUT1
IN
I
, L
LX1 2V/DIV
L1
RIPPLE 20mV/DIV
RIPPLE 50mV/DIV
I
1
L1
0.5A/DIV
9
= L
0.5A/DIV
2
= 2.2µH, C
1
= 10µF, C
2
ISL78228
= C
4
= 10µF, V
Unless otherwise noted, operating conditions are: T
OUT1
FIGURE 25. SOFT-START WITH NO LOAD CHANNEL 2 (PWM)
50µs/DIV
50µs/DIV
50µs/DIV
= 2.5V, V
FIGURE 21. LOAD TRANSIENT CHANNEL 2 (PWM)
FIGURE 23. LOAD TRANSIENT CHANNEL 2 (PFM)
OUT2
= 1.8V, I
V
V
OUT2
OUT2
I
L2
LX2 2V/DIV
RIPPLE 20mV/DIV
RIPPLE 50mV/DIV
I
OUT1
L2
0.5A/DIV
0.5A/DIV
= I
OUT2
=
A
V
= +25°C,
OUT2
I
L2
EN2 2V/DIV
PG 5V/DIV
0.5A/DIV
0.5V/DIV
May 2, 2011
FN7849.0