AAT2500B Datasheet, PDF (6/21 Pages) Advanced Analogic Technologies – Adjustable 3-Channel Regulator

SystemPower^TM
PRODUCT DATASHEET
AAT2500B
Adjustable 3-Channel Regulator
Typical Characteristics–Step-Down Converter
Step-Down Converter Efficiency vs. Output Current
(V_OUT = 1.8V)
100
90
80
70
60
50
V_IN = 5.5V
40
V_IN = 4.2V
30
V_IN = 3.6V
20 _{VIN = 2.7V}
10
0
0.1
1
10
PWM/Light Load Mode
Forced PWM Mode
100
1000
Output Current (mA)
Output Voltage Error vs. Temperature
(V_IN = 3.6V; V_OUT = 2.5V)
0.4
0.3
400mA
600mA
0.2
0.1
0.0
-0.1
-0.2
800mA _100mA
-0.3
-0.4
-0.5
-40
-15
10
35
60
85
Temperature (°C)
Step-Down Converter Load Regulation
(V_OUT = 2.5V; Forced PWM)
0.2
0.1
V_IN = 3V
V_IN = 3.6V
0.0
-0.1
-0.2
-0.3
0.1
V_IN = 4.2V
V_IN = 5.5V
1
10
100
1000
Output Current (mA)
Step-Down Converter Line Regulation
(V_OUT = 2.5V; Forced PWM)
0.4
0.3
1mA ^{50mA 100mA}
0.2
0.1
0.0
800mA
-0.1
600mA
-0.2
2.8 3.1 3.4 3.7 4.0 4.3 4.6 4.9 5.2 5.5
Input Voltage (V)
Step-Down Converter Output Ripple
(V_IN = 3.6V; V_OUT = 1.8V; I_OUT = 800mA)
1.82
1.81
1.80
V_OUT
1.79
I_INDUCTOR
1.0
0.8
0.6
0.4
0.2
Time (200ns/div)
Step-Down Converter Load Transient
(V_IN = 3.6V; I_OUT = 300mA to 650mA)
2.2
2.0 _VOUT
1.8
1.6 _{I OUT}
I_L
0.9
0.6
0.3
0.0
Time (20µs/div)
6
www.analogictech.com
2500B.2008.03.1.0