PRODUCT DATASHEET
AAT2601178
Total Power Solution for Portable Applications
Typical Characteristics—Step-Down Buck Converter
Step-Down Buck Efficiency vs. Output Current
(VOUT = 1.8V; L = 3.3µH)
Step-Down Buck Load Regulation
vs. Output Current
(VOUT = 1.8V; L = 3.3µH)
100
VBAT = 2.7V
0.5
0.4
90
VBAT = 3.6V
VCHGIN = 5.5V
VCHGIN = 4.5V
VBAT = 4.2V
80
70
60
50
40
30
20
10
0
0.3
VCHGIN = 6.0V
0.2
VBAT = 4.2V
0.1
0.0
VCHGIN = 4.5V
-0.1
-0.2
-0.3
-0.4
-0.5
VBAT = 2.7V
VCHGIN = 5.5V
VCHGIN = 6.0V
VCHGIN = 5.0V
VBAT = 3.6V
VCHGIN = 5.0V
1
10
100
1000
1
10
100
1000
Output Current (mA)
Output Current (mA)
Step-Down Buck Line Regulation
vs. CHGIN and Battery Input Voltage
(VOUT = 1.8V; L = 3.3µH)
Step-Down Buck Output Voltage vs. Temperature
(IOUT = 10mA)
1.825
VCHGIN = 5.0V
1.820
0.5
0.4
0.3
0.2
0.1
0
1.815
IOUT = 300mA
IOUT = 0.01mA
1.810
VBAT = 3.6V
IOUT = 200mA
VCHGIN = 5.5V
1.805
VBAT = 2.7V
1.800
VCHGIN = 6.0V
VCHGIN = 4.5V
IOUT = 10mA
-0.1
-0.2
-0.3
-0.4
-0.5
1.795
IOUT = 1mA
IOUT = 50mA
IOUT = 100mA
VCHGIN
1.790
1.785
VBAT = 4.2V
VBAT
1.780
4.2
2.5
3
3.5
4
4.5
5
5.5
6
-50
-25
0
25
50
75
100
Input VBAT, VCHGIN (V)
Temperature (°C)
VBAT Line Transient Response Step-Down Buck
(VBAT = 3.5V to 4.2V; IOUT = 300mA; VOUT = 1.8V; COUT = 4.7µF)
VCHGIN Line Transient Response Step-Down Buck
(VCHGIN = 4.5V to 5.5V; IOUT = 300mA; VOUT = 1.8V; COUT = 4.7µF)
1.92
1.88
1.86
1.84
1.84
1.82
VO
VO
1.80
1.76
4.5
1.80
1.78
1.76
6.0
5.5
5.0
4.5
4.0
4.0
V
VBAT
CHGIN
3.5
3.0
Time (100µs/div)
Time (100µs/div)
w w w . a n a l o g i c t e c h . c o m
12
2601.2008.01.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
