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ISL78233 Datasheet, PDF (7/18 Pages) Intersil Corporation – 3A and 4A Compact Synchronous Buck Regulators
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ISL78233, ISL78234
Typical Operating Performance Unless otherwise noted, operating conditions are: TA = +25°C, VVIN = 5V,
EN = VIN, SYNC = VIN, L = 1.0µH, C1 = 22µF, C2 = 2 x 22µF, IOUT = 0A to 4A.
100
100
2.5VOUT
2.5VOUT
90
90
80
1.2VOUT
1.5VOUT
1.8VOUT
70
80
1.2VOUT
70
1.5VOUT
1.8VOUT
60
60
50
50
40
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT LOAD (A)
FIGURE 4. EFFICIENCY vs LOAD (2MHz 3.3VIN PWM)
40
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT LOAD (A)
FIGURE 5. EFFICIENCY vs LOAD (2MHz 3.3VIN PFM)
100
2.5VOUT
3.3VOUT
90
80
1.5VOUT
1.2VOUT
1.8VOUT
70
60
50
40
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT LOAD (A)
FIGURE 6. EFFICIENCY vs LOAD (2MHz 5VIN PWM)
100
2.5VOUT
3.3VOUT
90
80
1.5VOUT
1.2VOUT
1.8VOUT
70
60
50
40
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT LOAD (A)
FIGURE 7. EFFICIENCY vs LOAD (2MHz 5VIN PFM)
1.219
1.214
1.209
1.204
1.199
1.194
3.3VIN PFM
5VIN PFM
5VIN PWM
1.189
1.184
3.3VIN PWM
1.179
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT LOAD (A)
FIGURE 8. VOUT REGULATION vs LOAD (1MHz, VOUT = 1.2V)
1.515
1.510
1.505
1.500
1.495
3.3VIN PFM
5VIN PFM
5VIN PWM
1.490
1.485
1.480
3.3VIN PWM
1.475
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT LOAD (A)
FIGURE 9. VOUT REGULATION vs LOAD (1MHz, VOUT = 1.5V)
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7
FN8359.5
April 23, 2015
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