AMS4123 Datasheet, PDF (8/18 Pages) Advanced Monolithic Systems Ltd – 3A 20V Step-Down Converter plus 1A LDO

AMS4123
Typical Characteristics
Start-Up Response V_in=12V
V_{SW out}
1V /div
V_{LDO out}
1V /div
400 µsec/div
Start-Up Response
Enable=V_in=12V
IL
2A/div
V_en
5V /div
•
V_{LDO out}
1V /div
2 msec/div
Start-Up Response V_in=20V
IL
2A/div
V_in
10V /div
V_{SW out}
1V /div
V_{LDO out}
1V /div
1 msec/div
IL
2A/div
V_en
5V /div
3A 20V Step-Down Converter + 1A LDO
Switching Frequency Temperature
Variation V_{SW out}=2.5V, V_in=12V
300
280
260
240
220
-45
-10
25
60
95
130
Ambient Temperature (ºC)
Feedback Voltage Temperature
Variation
0.8
0.0
FB_SW
-0.8
FB_LDO
-1.6
I_LDO=I_sw=0
V_{LDO out}=1.8V, V_{SW out}=2.5V
-2.4
-50 -10
30
70 110 150
Ambient Temperature (ºC)
Step-Down Converter Power Switch
Saturation Voltage V_in=12V
1.2
0.9
0.6
0.3
0
0
Tamb = 25⁰ C
Mounted on Eval. Board
0.7
1.4
2.1
2.8
3.5
Current (A)
3/5/2010
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