ISL78322 Datasheet, PDF (9/18 Pages) Intersil Corporation – Dual 2A/1.7A Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator

ISL78322
Typical Operating Performance (Unless otherwise noted) operating conditions are:
T_A = +25°C, V_VIN = 2.8V to 5.5V, EN = V_IN, L₁ = L₂ = 1.2µH, C₁ = 10µF, C₂ = C₄ = 22µF, I_OUT1 = 0A to 2A, I_OUT2 = 0A to 1.7A. (Continued)
LX1 2V/DIV
LX2 2V/DIV
V_OUT1 RIPPLE 20mV/DIV
V_OUT2 RIPPLE 20mV/DIV
IL1 0.2A/DIV
TB = 200ns/DIV
FIGURE 14. STEADY STATE OPERATION AT NO LOAD CHANNEL 1
(PWM)
IL2 0.2A/DIV
TB = 200ns/DIV
FIGURE 15. STEADY STATE OPERATION AT NO LOAD CHANNEL 2
(PWM)
LX1 2V/DIV
V_OUT1 RIPPLE 20mV/DIV
IL1 0.5A/DIV
TB = 500ns/DIV
FIGURE 16. STEADY STATE OPERATION AT NO LOAD CHANNEL 1
(PFM)
LX2 2V/DIV
V_OUT2 RIPPLE 20mV/DIV
IL2 0.5A/DIV
TB = 500ns/DIV
FIGURE 17. STEADY STATE OPERATION AT NO LOAD CHANNEL 2
(PFM)
LX1 2V/DIV
LX2 2V/DIV
V_OUT1 RIPPLE 20mV/DIV
IL1 1A/DIV
TB = 200ns/DIV
FIGURE 18. STEADY STATE OPERATION AT FULL LOAD CHANNEL 1
V_OUT2 RIPPLE 20mV/DIV
IL2 1A/DIV
TB = 200ns/DIV
FIGURE 19. STEADY STATE OPERATION WITH FULL LOAD CHANNEL 2
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9
FN7908.2
August 26, 2014