850kHz 1A Buck DC/DC Converter
Typical Characteristics
(C
O
= 22μF; V
O
= 1.5V; V
IN
= 3.6V; I
O
= 1A)
μ
20
16
12
8
200
160
80
40
0
120
12
AAT1152
AAT1152 Loop Gain and Phase
No Load Input Current vs. Temperature
(V
CC
= V
P
)
V
CC
= 5.5V
V
CC
= 5.0V
Input Current (mA)
Phase
10
8
6
4
2
0
-20
-5
10
25
40
55
70
85
Phase (degrees)
Gain (dB)
4
0
-4
-8
-12
-16
-20
10
Gain
4 x 22μF
5 x 22μF
100
3 x 22μF
-40
-80
-120
-160
-200
1000
V
CC
= 4.2V
V
CC
= 3.6V
V
CC
= 2.7V
Frequency (kHz)
Temperature (°C)
Non-Switching I
Q
vs. Temperature
(F
B
= 0V; V
P
= V
CC
)
Switching Waveform
(V
IN
= 3.6V; V
OUT
= 1.5V; I
OUT
= 1.2A)
Operating Current (μA)
200
190
180
170
160
150
140
130
120
110
100
-20
V
CC
= 5.5V
V
CC
= 5.0V
V
CC
= 4.2V
V
CC
= 2.7V
-5
10
25
V
(LX)
2V/div
V
CC
= 3.6V
I
L
500mA/div
70
85
40
55
Temperature (°C)
Time (500ns/div)
Transient Response
(V
IN
= 3.6V; V
OUT
= 1.5V; I
LOAD
= 0.25 to 1.2A)
V
OUT
50mV/div
Output Ripple
(V
IN
= 3.6V; V
OUT
= 1.5V; I
OUT
= 0A)
V
OUT
5mV/div
BW = 20MHz
Inductor Current
500mA/div
LX
2V/div
Time (20µs/div)
Time (500ns/div)
1152.2006.09.1.7
7
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
