PRODUCT DATASHEET
AAT1
189
SwitchReg
TM
Typical Characteristics
Step-Down Converter Output Ripple
(V
IN
= 12V; V
OUT
= 3.3V; I
OUT
= 1mA)
Output Voltage (AC Coupled)
(bottom) (V)
Output Voltage (AC Coupled)
(bottom) (mV)
LX Voltage (top) (V)
Inductor Current (middle) (A)
12V
High Voltage Step-Down Regulator
Step-Down Converter Output Ripple
(V
IN
= 12V; V
OUT
= 5V; I
OUT
= 1mA)
LX Voltage (top) (V)
Inductor Current (middle) (A)
12V
0V
0.4
0.2
0.0
3.30
3.29
3.28
0V
0.1
0.0
-0.1
5.00
4.99
Time (2µs/div)
Time (2µs/div)
Step-Down Converter Output Ripple
(V
IN
= 12V; V
OUT
= 3.3V; I
OUT
= 2.5A)
Output Voltage (AC Coupled)
(bottom) (V)
Output Voltage (AC Coupled)
(bottom) (V)
LX Voltage (top) (V)
Inductor Current (middle) (A)
12V
0V
Step-Down Converter Output Ripple
(V
IN
= 12V; V
OUT
= 5V; I
OUT
= 2.5A)
LX Voltage (top) (V)
Inductor Current (middle) (A)
12V
0V
4.0
3.0
2.0
5.02
5.00
4.98
3.0
2.0
1.0
3.31
3.30
3.29
Time (1µs/div)
Time (1µs/div)
Step-Down Converter Load Transient Response
(I
OUT
= 1.875A to 2.5A; V
IN
= 12V; V
OUT
= 3.3V; C
OUT
= 2x22µF)
3.0
Step-Down Converter Load Transient Response
(I
OUT
= 1.875A to 2.5A; V
IN
= 12V; V
OUT
= 5V; C
OUT
= 2x22µF)
Output Voltage
(AC Coupled) (bottom) (V)
3.0
Output Voltage
(AC Coupled) (bottom) (V)
Output Current (top) (A)
Output Current (top) (A)
2.5
2.5A
1.875A
2.0
1.5
1.0
3.4
3.3
3.2
2.5
2.5A
1.875A
2.0
1.5
1.0
5.1
5.0
4.9
Time (100µs/div)
Time (100µs/div)
6
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1189.2008.06.1.0
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