ACT8740
Rev PrB, 25-Feb-08
STEP-DOWN DC/DC CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
(ACT8740QLEGA, VVP1 = VVP2 = 3.6V, L = 3.3µH, CVP1 = CVP2 = 2.2µF, COUT1 = COUT2 = 10µF, TA = 25°C, unless otherwise specified.)
REG1 Efficiency vs. Load Current
REG1 Transient Peak Inductor Current
100
650
630
610
590
VOUT1 = 1.8V
3.2V
90
80
70
60
3.6V
4.2V
570
550
50
0.1
3.0
3.5
4.0
4.5
5.0
5.5
1
10
100
1000
Output Current (mA)
VP1 Voltage (V)
REG1 MOSFET Resistance
REG1 Load Regulation
600
500
400
0.2
0.0
PMOS
NMOS
-0.2
3.6V
4.2V
-0.4
-0.6
-0.8
-1.0
300
200
100
0
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
50
100
150
200
250
300
350 400
VP1 Voltage (V)
Output Current (mA)
OUT1 Regulation Voltage
1.812
IOUT1 = 35mA
1.808
1.804
1.800
1.796
1.792
1.788
-40
-20
0
20
40
60
85
Temperature (°C)
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