ISL78214 Datasheet, PDF (8/15 Pages) Intersil Corporation – 4A Low Quiescent Current High Efficiency Synchronous Buck Regulator

ISL78214
Typical Operating Performance
Unless otherwise noted, operating conditions are: T_A = +25°C, V_VIN = 2.5V to 5.5V, EN = V_IN, SYNCH = 0V, L = 1.5µH,
C₁ = 2x22µF, C₂ = 2x22µF, I_OUT = 0A to 4A. (Continued)
1.83
1.83
1.82
1.81
1.80
4A LOAD PWM
0A LOAD PWM
1.82
1.81
1.80
4A LOAD
0A LOAD
1.79
1.79
1.78
1.78
1.77
1.77
1.76
1.76
1.75
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
FIGURE 15. OUTPUT VOLTAGE REGULATION vs VIN
(PWM V_OUT = 1.8 )
1.75
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
FIGURE 16. OUTPUT VOLTAGE REGULATION vs VIN
(PFM V_OUT = 1.8V)
LX 2V/DIV
V_OUT RIPPLE 20mV/DIV
IL 0.5A/DIV
LX 2V/DIV
IL 0.5A/DIV
V_OUT RIPPLE 20mV/DIV
FIGURE 17. STEADY STATE OPERATION AT NO LOAD
(PWM)
FIGURE 18. STEADY STATE OPERATION AT NO LOAD
(PFM)
LX 2V/DIV
IL 2A/DIV
V_OUT RIPPLE 20mV/DIV
FIGURE 19. STEADY STATE OPERATION WITH FULL
LOAD
8
LX 2V/DIV
V_OUT RIPPLE 50mV/DIV
IL 1A/DIV
FIGURE 20. MODE TRANSITION CCM TO DCM
FN7551.0
March 8, 2010