ISL78322 Datasheet, PDF (12/18 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
V_OUT1 RIPPLE 20mV/DIV
IL1 0.2A/DIV
SYNCH 2V/DIV
TB = 100ns/DIV
LX2 2V/DIV
V_OUT2 RIPPLE 20mV/DIV
IL2 0.2A/DIV
SYNCH 2V/DIV
TB = 100ns/DIV
FIGURE 32. STEADY STATE OPERATION AT NO LOAD (PFM) WITH
FREQUENCY = 8MHz CHANNEL 1
FIGURE 33. STEADY STATE OPERATION AT NO LOAD (PFM) WITH
FREQUENCY = 8MHz CHANNEL 2
LX1 2V/DIV
V_OUT1 RIPPLE 20mV/DIV
IL1 1A/DIV
SYNCH 2V/DIV
TB = 100ns/DIV
FIGURE 34. STEADY STATE OPERATION AT FULL LOAD (PFM) WITH
FREQUENCY = 8MHz CHANNEL 1
LX1 2V/DIV
V_OUT1 2V/DIV
IL1 0.5A/DIV
PG 1V/DIV
TB = 1µs/DIV
FIGURE 36. V_OUT1 HARD SHORT TO V_IN NEGATIVE CURRENT
WAVEFORMS AT HIGH LINE CHANNEL 1
LX2 2V/DIV
V_OUT2 RIPPLE 20mV/DIV
IL2 0.5A/DIV
SYNCH 2V/DIV
TB = 100ns/DIV
FIGURE 35. STEADY STATE OPERATION AT FULL LOAD (PFM) WITH
FREQUENCY = 8MHz CHANNEL 2
IL1 0.5A/DIV
PG 1V/DIV
V_OUT1 2V/DIV
LX1 2V/DIV
TB = 1µs/DIV
FIGURE 37. RECOVERY FROM HARD SHORT NEGATIVE CURRENT
WAVEFORMS V_OUT1 CHANNEL 1
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August 26, 2014