ISL78235 Datasheet, PDF (8/20 Pages) Intersil Corporation – 5A Automotive Synchronous Buck Regulator

ISL78235
Typical Operating Performance Unless otherwise noted, operating conditions are: T_A = +25°C, V_IN = V_DD = 5V,
V_OUT = 1.8V, EN = V_DD, SYNC = V_DD, L = 0.68µH, f_SW = 2MHz, C_IN = 2 x 22µF, C_OUT = 2 x 22µF, I_OUT = 0A to 5A. (Continued)
1.219
1.810
1.214
1.805
1.209
1.204
1.199
5V PFM ^{3.3V PFM}
5V PWM
3.3V PWM
1.800
1.795
1.790
5V PFM
3.3V PFM
5V PWM
3.3V PWM
1.194
1.189
1.785
1.780
1.184
1.179
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
OUTPUT LOAD (A)
FIGURE 11. V_OUT REGULATION vs LOAD (V_OUT = 1.2V)
1.775
1.770
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
OUTPUT LOAD (A)
FIGURE 12. V_OUT REGULATION vs LOAD (V_OUT = 1.8V)
1.020
1.015
1.010
1.005
1.000
3.3V PFM
3.3V PWM
0.995
0.990
0.985
0.980
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
OUTPUT LOAD (A)
FIGURE 13. V_OUT REGULATION vs LOAD (V_OUT = 1.0V)
75
70
T = +125°C
65
60
T = +25°C
55
T = -40°C
50
3.0
3.5
4.0
4.5
5.0
5.5
V_IN (V)
FIGURE 14. PHASE MINIMUM ON-TIME vs VIN
PHASE 5V/DIV
V_OUT 1V/DIV
SS = GND
C_OUT = 4x22µF
EN 2V/DIV
PG 5V/DIV
500µs/DIV
FIGURE 15. EN START-UP AT NO LOAD (SYNC = GND)
Submit Document Feedback
8
PHASE 5V/DIV
V_OUT 1V/DIV
EN 2V/DIV
SS = GND
C_OUT = 4x22µF
PG 5V/DIV
500µs/DIV
FIGURE 16. EN START-UP AT NO LOAD (SYNC = VDD)
FN8713.2
July 1, 2015