ISL78233 Datasheet, PDF (9/18 Pages) Intersil Corporation – 3A and 4A Compact Synchronous Buck Regulators

ISL78233, ISL78234
Typical Operating Performance Unless otherwise noted, operating conditions are: T_A = +25°C, V_VIN = 5V,
EN = V_IN, SYNC = V_IN, L = 1.0µH, C₁ = 22µF, C₂ = 2 x 22µF, I_OUT = 0A to 4A. (Continued)
PHASE 5V/DIV
PHASE 5V/DIV
V_OUT 1V/DIV
V_EN 5V/DIV
PG 5V/DIV
400µs/DIV
FIGURE 16. SHUTDOWN AT NO LOAD (PFM)
V_OUT 1V/DIV
V_EN 5V/DIV
PG 5V/DIV
400µs/DIV
FIGURE 17. SHUTDOWN AT NO LOAD (PWM)
PHASE 5V/DIV
V_OUT 1V/DIV
V_EN 5V/DIV
PG 5V/DIV
500µs/DIV
FIGURE 18. START-UP AT 4A LOAD (PWM)
PHASE 5V/DIV
V_OUT 1V/DIV
V_EN 5V/DIV
PG 5V/DIV
500µs/DIV
FIGURE 19. SHUTDOWN AT 4A LOAD (PWM)
I_OUT 2A/DIV
V_OUT 1V/DIV
V_EN 5V/DIV
PG 5V/DIV
500µs/DIV
FIGURE 20. START-UP AT 4A LOAD (PFM)
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I_OUT 2A/DIV
V_OUT 1V/DIV
V_EN 5V/DIV
PG 5V/DIV
500µs/DIV
FIGURE 21. SHUTDOWN AT 4A LOAD (PFM)
FN8359.5
April 23, 2015