ISL78228 Datasheet, PDF (12/18 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)
PHASE1 5V/DIV
LX1 5V/DIV
I_L1 0.5A/DIV
V_OUT1 1V/DIV
V_OUT1 1V/DIV
PG 5V/DIV
10µs/DIV
FIGURE 38. OUTPUT SHORT CIRCUIT CHANNEL 1
I_L1 0.5A/DIV
500µs/DIV
PG 5V/DIV
FIGURE 39. OUTPUT SHORT CIRCUIT RECOVERY CHANNEL 1
10µs/DIV
PHASE2 5V/DIV
I_L2 0.5A/DIV
V_OUT2 1V/DIV
PG 5V/DIV
FIGURE 40. OUTPUT SHORT CIRCUIT CHANNEL 2
500µs/DIV
LX2 5V/DIV
V_OUT2 0.5V/DIV
I_L2 0.5A/DIV
PG 5V/DIV
FIGURE 41. OUTPUT SHORT CIRCUIT RECOVERY CHANNEL 2
2.4
V_IN 6V I_OUT1 OC
V_IN 6V I_OUT2 OC
2.0
1.6
1.2
0.8 ^VIN ^{3.5V I}OUT2 ^OC
0.4
V_IN 3.5V I_OUT1 OC
0
-50 -30 -10 10
20
50
70
90
TEMPERATURE (°C)
FIGURE 42. OUTPUT CURRENT LIMIT vs TEMPERATURE
110
12
FN7849.0
May 2, 2011