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ISL78235R5668 Datasheet, PDF (12/20 Pages) Intersil Corporation – Automotive 5A Synchronous Buck Regulator
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ISL78235R5668
Typical Operating Performance Unless otherwise noted, operating conditions are: TA = +25°C, VIN = VDD = 3V,
VOUT = 1.0V, EN = VDD, SYNC = VDD, L = 0.33µH, fSW = 2MHz, CIN = 4 x 22µF, COUT = 4 x 47µF, IOUT = 0A to 8A. (Continued)
PHASE 2V/DIV
PHASE 5V/DIV
VOUT 1V/DIV
I_PHASE 5A/DIV
VOUT 20mV/DIV AC
200ns/DIV
FIGURE 28. STEADY STATE AT 8A LOAD; VIN = 2.7V
VOUT 1V/DIV
I_PHASE 5A/DIV
VOUT 20mV/DIV AC
VOUT = 1.2V
200ns/DIV
FIGURE 29. STEADY STATE AT 8A LOAD; VIN = 5.5V
VOUT AT LOAD 200mV/DIV
VOUT 20mV/DIV AC
IOUT 2A/DIV
COUT = 800µF
RCOMP = 187kΩ
CCOMP = 150pF
200ns/DIV
FIGURE 30. LOAD TRANSIENT 0A TO 6A; 100A/µs
I_PHASE 2A/DIV
VIN 1V/DIV
PG 2V/DIV
VOUT 500mV/DIV
4µs/DIV
FIGURE 32. OUTPUT SHORT-CIRCUIT PROTECTION
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VOUT AT LOAD 200mV/DIV
COUT = 800µF
RCOMP = 187kΩ
CCOMP = 150pF
VOUT 20mV/DIV AC
IOUT 2A/DIV
200ns/DIV
FIGURE 31. LOAD TRANSIENT 6A TO 0A; 100A/µs
I_PHASE 2A/DIV CSS = 1nF
VIN 1V/DIV
PHASE 1V/DIV
SS 500mV/DIV
1ms/DIV
FIGURE 33. START UP INTO SHORT-CIRCUIT LOAD
FN8769.1
January 21, 2016
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