Active-Semi
ACT8325
Rev 2, 25-May-11
STEP-DOWN DC/DC CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
(ACT8325NDAAA, V
VP1
= V
VP2
= 3.6V, L = 3.3µH, C
VP1
= C
VP2
= 2.2μF, C
OUT1
= C
OUT2
= 10μF, T
A
= 25°C, unless otherwise specified.)
REG1 Efficiency vs. Load Current
95
90
85
V
OUT1
= 1.2V
V
IN
= 3.6V
100
ACT8325-001
REG2 Efficiency vs. Load Current
ACT8325-002
V
OUT2
= 3.3V
V
IN
= 3.6V
90
Efficiency (%)
80
75
70
65
60
55
50
1
10
Efficiency (%)
V
IN
= 4.2V
80
V
IN
= 4.2V
70
60
50
100
1000
1
10
100
1000
Output Current (mA)
Output Current (mA)
OUT1 Regulation Voltage
0.67
0.56
0.44
I
OUT1
= 35mA
0.55
0.45
ACT8325-003
OUT2 Regulation Voltage
ACT8325-004
I
OUT2
= 35mA
OUT1 Voltage (%)
0.33
0.22
0.11
0.00
-0.11
-0.22
-0.33
-0.44
-0.56
-0.67
-40
-20
0
20
40
60
OUT2 Voltage (%)
0.36
0.27
0.18
0.09
0.00
-0.09
-0.18
-0.27
-0.36
-0.45
-0.55
85
-40
-20
0
20
40
60
85
Temperature (°C)
Temperature (°C)
REG1 MOSFET Resistance
600
500
PMOS
440
360
280
ACT8325-005
REG2 MOSFET Resistance
ACT8325-006
PMOS
R
DSON
(mΩ)
400
300
200
100
NMOS
R
DSON
(mΩ)
NMOS
200
120
40
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
VP1 Voltage (V)
VP2 Voltage (V)
Innovative Power
TM
ActivePMU
TM
-8-
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