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| ISL78228_15 Datasheet, PDF (11/18 Pages) Intersil Corporation – Dual 800mA Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator | |||
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ISL78228
Typical Operating Performance Unless otherwise noted, operating conditions are: TA = +25°C, VIN = 2.75V to
5.5V, EN = VIN, L1 = L2 = 2.2µH, C1 = 10µF, C2 = C4 = 10µF, VOUT1 = 2.5V, VOUT2 = 1.8V, IOUT1 = IOUT2 = 0A to 800mA. (Continued)
LX1 2V/DIV
LX1 2V/DIV
SYNCH 2V/DIV
SYNCH 2V/DIV
IL1 0.5A/DIV
VOUT1 RIPPLE 20mV/DIV
200ns/DIV
FIGURE 32. CH1 STEADY STATE OPERATION AT NO LOAD (PFM) WITH
FREQUENCY = 4MHz
IL1 0.5A/DIV
VOUT1 RIPPLE 20mV/DIV
200ns/DIV
FIGURE 33. CH1 STEADY STATE OPERATION AT FULL LOAD (PFM)
WITH FREQUENCY = 4MHz
LX2 2V/DIV
LX2 2V/DIV
SYNCH 2V/DIV
SYNCH 2V/DIV
VOUT2 RIPPLE 20mV/DIV
IL2 0.5A/DIV
200ns/DIV
FIGURE 34. CH2 STEADY STATE OPERATION AT NO LOAD (PFM) WITH
FREQUENCY = 4MHz
IL2 0.5A/DIV
VOUT2 RIPPLE 20mV/DIV
200ns/DIV
FIGURE 35. CH2 STEADY STATE OPERATION AT FULL LOAD (PFM)
WITH FREQUENCY = 4MHz
LX1 5V/DIV
LX2 5V/DIV
SYNCH 5V/DIV
VOUT1 RIPPLE 20mV/DIV
VOUT2 RIPPLE 20mV/DIV
100ns/DIV
FIGURE 36. CH1 AND CH2 STEADY STATE OPERATION AT NO LOAD
(PFM) WITH FREQUENCY = 4MHz
LX1 5V/DIV
LX2 5V/DIV
SYNCH 5V/DIV
VOUT1 RIPPLE 20mV/DIV
VOUT2 RIPPLE 20mV/DIV
100ns/DIV
FIGURE 37. CH1 AND CH2 STEADY STATE OPERATION AT FULL LOAD
(PFM) WITH FREQUENCY = 4MHz
Submit Document Feedback 11
FN7849.3
April 13, 2015
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