PRODUCT DATASHEET
AAT2687
SystemPower
TM
PMIC Solution for 24V Systems with 2 High Performance Step-Down Converters
Typical Characteristics—Channel 1
Step-Down Converter Efficiency vs. Load Current
100
90
80
Step-Down Converter
Load Regulation
vs. Load Current
Output Voltage Difference (%)
2
1.5
1
0.5
0
-0.5
-1
-1.5
-2
0.001
Efficiency (%)
70
60
50
40
30
20
10
0
0.001
0.01
0.1
1
V
IN1
= 6V
V
IN1
= 7V
V
IN1
= 8V
V
IN1
= 12V
V
IN1
= 18V
V
IN1
= 24V
10
V
IN1
= 6V
V
IN1
= 7V
V
IN1
= 8V
V
IN1
= 12V
V
IN1
= 18V
V
IN1
= 24V
0.01
0.1
1
10
Load Current (A)
Load Current (A)
Step-Down Converter
Line Regulation
vs. Load Current
Output Voltage Difference (%)
2
1.5
1
0.5
0
-0.5
-1
-1.5
-2
6
9
12
15
18
21
24
No Load Step-Down Converter Input Current
vs. Input Voltage
650
625
Input Current (µA)
I
OUT1
= 0.1µA
I
OUT1
= 2.25A
I
OUT1
= 3.5A
I
OUT1
= 4mA
I
OUT1
= 4.5A
600
575
550
525
500
475
450
6
9
12
15
18
21
85°C
25°C
-40°C
24
Input Voltage (V)
Input Voltage (V)
Step-Down Converter Switching Frequency
vs. Input Voltage
6
4
2
0
-2
-4
-6
-8
6
8
10
12
14
16
18
20
22
24
Step-Down Converter Output Voltage
vs. Temperature
(V
OUT
= 3.3V; I
OUT1
= 4.5A; C
OUT1
= 66µF; L = 4.7µH; V
IN1
= 12V)
Output Voltage Difference (%)
1
0.75
0.5
0.25
0
-0.25
-0.5
-0.75
-1
-40
-15
10
35
60
85
Frequency Variation (%)
8
(V
OUT1
= 3.3V; I
OUT1
= 4.5A)
85°C
25°C
-40°C
Input Voltage (V)
Temperature (°C)
2687.2008.06.1.0
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