RT8509A
7
DS8509A-00 November 2013
www.richtek.com
©
Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Boost Reference Voltage vs. Input Voltage
1
1.1
1.2
1.3
1.4
1.5
2
4
6
8
10
12
14
Input Voltage (V)
Boost
R
e
fe
rence V
o
ltage (
V
)
Typical Operating Characteristics
Boost Efficiency vs. Load Current
50
60
70
80
90
100
0
0.3
0.6
0.9
1.2
1.5
Load Current (A)
Boost
E
ffi
ci
ency (
%
)
V
OUT
= 18V, f
OSC
= 1.2MHz
V
IN
= 14V
V
IN
= 12V
V
IN
= 10V
Boost Efficiency vs. Load Current
50
60
70
80
90
100
0
0.1
0.2
0.3
0.4
0.5
Load Current (A)
B
o
o
st E
ffic
ie
n
cy
(%
)
V
OUT
= 13.5V, f
OSC
= 1.2MHz
V
IN
= 3.3V
V
IN
= 5V
Boost Reference Voltage vs. Temperature
1
1.1
1.2
1.3
1.4
1.5
-50
-25
0
25
50
75
100
125
Temperature (°C)
Boost
R
e
fe
rence Vol
tage (
V
)
V
IN
= 3.3V
Boost Frequency vs. Temperature
900
1000
1100
1200
1300
1400
-50
-25
0
25
50
75
100
125
Temperature (°C)
B
oost
Fr
equency (
kH
z)
V
IN
= 3.3V
Boost Current Limit vs. Input Voltage
3
4
5
6
7
8
2
4
6
8
10
12
14
Input Voltage (V)
Boost
C
u
rr
e
nt
Li
m
it (
A
)
