PRODUCT DATASHEET
AAT2783
SystemPower
TM
Triple Output PMIC: Dual Buck with Low-V
IN
LDO
Typical Characteristics—Buck Converter 1
Step-Down Converter 1 Output Ripple
(V
IN
= 3.3V; V
OUT1
= 1.2V; I
OUT1
= 1A)
Output Voltage
(AC coupled) (top) (V)
Output Voltage
(AC coupled) (top) (V)
1.22
1.22
Step-Down Converter 1 Output Ripple
(V
IN
= 3.3V; V
OUT1
= 1.2V; I
OUT1
= 1mA)
Inductor Current
(bottom) (A)
Inductor Current
(bottom) (A)
1.20
1.18
1.20
1.18
1.2
1.0
0.8
0.2
0.0
Time (500ns/div)
Time (10µs/div)
Step-Down Converter 1 Line Transient Response
(V
IN
= 3V to 4V; V
OUT1
= 1.2V; I
OUT1
= 1A; C
OUT
= 10µF)
5
Step-Down Converter 1 Load Transient Response
(I
OUT1
= 750mA to 1A; V
IN
= 3.3V; C
OUT1
= 10µF; C
FF
= 100pF)
Output Voltage (AC coupled)
(middle) (V)
Inductor Current (top) (A)
Output Current (bottom) (A)
Input Voltage (top) (V)
4
3
2
1.4
1.3
1.2
1.1
1.0
0.75A
1.25
1.20
1.15
1A
Output Voltage
(bottom) (A)
0.75A
1A
1.0
0.5
Time (100µs/div)
Time (100µs/div)
Step-Down Converter 1 Soft Start
(V
IN
= 3V; V
OUT1
= 1.2V; I
OUT1
= 1A; C
FF
= 100pF)
Inductor Current (bottom) (A)
Enable Voltage (top) (V)
Output Voltage (middle) (V)
4
3
2
1
0
1.0
0.5
0.0
Time (50µs/div)
8
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2783.2008.03.1.0
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