RT8058A
5
DS8058A-02 April 2011 www.richtek.com
Typical Operating Characteristics
Switching Frequency vs. Temperature
1.00
1.05
1.10
1.15
1.20
1.25
1.30
1.35
1.40
-50 -25 0 25 50 75 100 125
Temperature
Switching Frequency (MHz)
(°C)
V
IN
= 3.3V, V
OUT
= 1.2V, I
OUT
= 300mA
Switching Frequency vs. Input Voltage
1.00
1.05
1.10
1.15
1.20
1.25
1.30
1.35
1.40
2.5 3 3.5 4 4.5 5 5.5
Input Voltage (V)
Switching Frequency (MHz)
V
OUT
= 1.2V, I
OUT
= 300mA
FB Voltage vs. Temperature
0.580
0.582
0.584
0.586
0.588
0.590
0.592
0.594
0.596
0.598
0.600
-50 -25 0 25 50 75 100 125
Temperature
FB Voltage (V)
V
IN
= 3.3V, I
OUT
= 0A
(°C)
Output Voltage vs. Input Voltage
1.190
1.191
1.192
1.193
1.194
1.195
1.196
1.197
1.198
1.199
1.200
2.5 3 3.5 4 4.5 5 5.5
Input Voltage (V)
Output Voltage (V)
I
OUT
= 0A
Efficiency vs. Output Current
0
10
20
30
40
50
60
70
80
90
100
0 0.25 0.5 0.75 1 1.25 1.5 1.75 2
Output Current (A)
Efficiency (%)
V
IN
= 3.3V
V
IN
= 5V
V
OUT
= 1.2V, L = 3.3μH, C
OUT
= 22μF
Output Voltage vs. Output Current
1.188
1.189
1.190
1.191
1.192
1.193
1.194
1.195
1.196
0 0.25 0.5 0.75 1 1.25 1.5 1.75 2
Output Current (A)
Output Voltage (V)
V
IN
= 3.3V
V
IN
= 5V
V
OUT
= 1.2V, L = 3.3μH, C
OUT
= 22μF