rt8020 Richtek Technology Corporation, rt8020 Datasheet - Page 6

• Manufacturer Part Number: rt8020
• Description: Dual High-efficiency Step-down Dc-dc Converter
• Manufacturer: Richtek Technology Corporation

www.richtek.com
6
RT8020
Typical Operating Characteristics
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
100
100
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
0
0
2.5
0
0
V
V
V
2.8
0.1
0.1
IN
IN
IN
EN Pin Threshold vs. Input Voltage
Efficiency vs. Output Current
Efficiency vs. Output Current
= 3.6V
= 4.2V
= 5.0V
3.1
0.2
0.2
3.4
V
0.3
0.3
V
OUT
Output Current (A)
Output Current (A)
OUT
Input Voltage (V)
3.7
0.4
0.4
= 3.3V, L = 4.7 H, C
Rising
Falling
= 1.2V, L = 2.2 H, C
0.5
0.5
4
V
0.6
0.6
4.3
OUT
= 1.2V, I
0.7
0.7
4.6
OUT
0.8
OUT
0.8
4.9
V
V
V
V
IN
IN
IN
IN
OUT
= 4.7 F
= 5.0V
= 3.6V
= 3.3V
= 2.5V
= 10 F
5.2
0.9
0.9
= 0A
5.5
1
1
2.00
1.90
1.80
1.70
1.60
1.50
1.40
1.30
1.20
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
100
90
80
70
60
50
40
30
20
10
0
-40 -25 -10
-40 -25 -10
0
EN Pin Threshold vs. Temperature
0.1
UVLO Threshold vs. Temperature
Efficiency vs. Output Current
0.2
5
5
Temperature
Temperature
0.3
V
OUT
Output Current (A)
V
20
20
IN
0.4
= 1.2V, L = 4.7 H, C
= 3.6V, V
35
35
DS8020-03 August 2007
0.5
50
50
( C)
V
( C)
Rising
Falling
0.6
OUT
Rising
Falling
OUT
65
65
= 1.2V, I
= 1.2V, I
0.7
80
80
OUT
0.8
V
V
V
V
95 110 125
95 110 125
IN
IN
IN
IN
OUT
OUT
= 4.7 F
= 5.0V
= 3.6V
= 3.3V
= 2.5V
0.9
= 0A
= 0A
1