ISL78228ARZ INTERSIL [Intersil Corporation], ISL78228ARZ Datasheet - Page 11

• 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
FIGURE 32. CH1 STEADY STATE OPERATION AT NO LOAD (PFM)
FIGURE 34. CH2 STEADY STATE OPERATION AT NO LOAD (PFM)
FIGURE 36. CH1 AND CH2 STEADY STATE OPERATION AT NO LOAD
I
200ns/DIV
= 2.75V to 5.5V, EN = V
L1
200ns/DIV
100ns/DIV
0.5A/DIV
WITH FREQUENCY = 4MHz
WITH FREQUENCY = 4MHz
(PFM) WITH FREQUENCY = 4MHz
V
V
OUT1
OUT2
V
V
OUT2
SYNCH 2V/DIV
OUT1
SYNCH 5V/DIV
LX2 5V/DIV
LX1 5V/DIV
RIPPLE 20mV/DIV
LX1 2V/DIV
IN
SYNCH 2V/DIV
RIPPLE 20mV/DIV
I
LX2 2V/DIV
, L
L2
RIPPLE 20mV/DIV
RIPPLE 20mV/DIV
1
11
0.5A/DIV
= L
2
= 2.2µH, C
1
= 10µF, C
2
ISL78228
= C
4
= 10µF, V
Unless otherwise noted, operating conditions are: T
FIGURE 33. CH1 STEADY STATE OPERATION AT FULL LOAD (PFM)
FIGURE 35. CH2 STEADY STATE OPERATION AT FULL LOAD (PFM)
FIGURE 37. CH1 AND CH2 STEADY STATE OPERATION AT FULL LOAD
OUT1
200ns/DIV
200ns/DIV
100ns/DIV
I
L1
= 2.5V, V
0.5A/DIV
WITH FREQUENCY = 4MHz
WITH FREQUENCY = 4MHz
(PFM) WITH FREQUENCY = 4MHz
OUT2
V
V
OUT1
V
OUT2
V
OUT1
OUT2
= 1.8V, I
SYNCH 2V/DIV
SYNCH 2V/DIV
SYNCH 5V/DIV
I
LX2 5V/DIV
LX2 2V/DIV
LX1 5V/DIV
RIPPLE 20mV/DIV
L2
LX1 2V/DIV
RIPPLE 20mV/DIV
RIPPLE 20mV/DIV
RIPPLE 20mV/DIV
0.5A/DIV
OUT1
= I
OUT2
=
A
= +25°C,
May 2, 2011
FN7849.0