ISL78228_15 Datasheet, PDF (8/18 Pages) Intersil Corporation – Dual 800mA Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator

ISL78228
Typical Operating Performance Unless otherwise noted, operating conditions are: T_A = +25°C, V_IN = 2.75V to
5.5V, EN = V_IN, L₁ = L₂ = 2.2µH, C₁ = 10µF, C₂ = C₄ = 10µF, V_OUT1 = 2.5V, V_OUT2 = 1.8V, I_OUT1 = I_OUT2 = 0A to 800mA. (Continued)
LX1 2V/DIV
LX2 2V/DIV
V_OUT1 RIPPLE 20mV/DIV
V_OUT2 RIPPLE 20mV/DIV
I_L1 0.5A/DIV
500ns/DIV
FIGURE 14. STEADY STATE OPERATION AT NO LOAD CHANNEL 1 (PWM)
I_L2 0.5A/DIV
500ns/DIV
FIGURE 15. STEADY STATE OPERATION AT NO LOAD CHANNEL 2 (PWM)
LX1 2V/DIV
LX2 2V/DIV
V_OUT1 RIPPLE 20mV/DIV
V_OUT2 RIPPLE 20mV/DIV
500ns/DIV
I_L1 0.5A/DIV
FIGURE 16. STEADY STATE OPERATION AT NO LOAD CHANNEL 1 (PFM)
500ns/DIV
I_L2 0.5A/DIV
FIGURE 17. STEADY STATE OPERATION AT NO LOAD CHANNEL 2 (PFM)
LX1 2V/DIV
V_OUT1 RIPPLE 20mV/DIV
I_L1 0.5A/DIV
500ns/DIV
FIGURE 18. STEADY STATE OPERATION WITH FULL LOAD CHANNEL 1
LX2 2V/DIV
V_OUT2 RIPPLE 20mV/DIV
I_L2 0.5A/DIV
500ns/DIV
FIGURE 19. STEADY STATE OPERATION WITH FULL LOAD CHANNEL 2
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FN7849.3
April 13, 2015