ISL78235R5668 Datasheet, PDF (13/20 Pages) Intersil Corporation – Automotive 5A Synchronous Buck Regulator

ISL78235R5668
Typical Operating Performance Unless otherwise noted, operating conditions are: T_A = +25°C, V_IN = V_DD = 3V,
V_OUT = 1.0V, EN = V_DD, SYNC = V_DD, L = 0.33µH, f_SW = 2MHz, C_IN = 4 x 22µF, C_OUT = 4 x 47µF, I_OUT = 0A to 8A. (Continued)
I_PHASE 2A/DIV
C_SS = 1nF
I_PHASE 2A/DIV
V_OUT 500mV/DIV
V_IN 1V/DIV
PHASE 1V/DIV
SS 500mV/DIV
PHASE 1V/DIV
PG 2V/DIV
400µs/DIV
FIGURE 34. SHORT-CIRCUIT HICCUP WAVEFORM
PHASE 5V/DIV
V_OUT INTO 3V SUPPLY
V_OUT 1V/DIV
I_PHASE 1A/DIV
PG 5V/DIV
400µs/DIV
FIGURE 36. OVERVOLTAGE PROTECTION
V_TEMP 500mV/DIV
PG 2V/DIV
V_OUT 1V/DIV
TEMP = (V_TEMP-1.1092)/4.1mV
+125°C TO +170°C TRANSIENT
LOAD = 4A
2s/DIV
FIGURE 38. OVER-TEMPERATURE PROTECTION
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400µs/DIV
FIGURE 35. SHORT CIRCUIT HICCUP RECOVERY TO 1A LOAD
PHASE 5V/DIV
V_OUT 1V/DIV
V_OUT FROM 3V SUPPLY
I_PHASE1A/DIV
PG 5V/DIV
400µs/DIV
FIGURE 37. OVERVOLTAGE RECOVERY
V_TEMP 500mV/DIV
TEMP = (V_TEMP-1.1092)/4.1mV
+125°C TO +170°C TRANSIENT
LOAD = 4A
PG 2V/DIV
V_OUT 1V/DIV
2s/DIV
FIGURE 39. OVER-TEMPERATURE RECOVERY
FN8769.1
January 21, 2016