Preliminary
Electrical Characteristics
(Refer to Fig. 4)
Parameter
Output Voltage Accuracy
Input Voltage
Start-up Voltage
Efficiency
Input Current 1
Input Current 2
EXT “H” Output
Current
EXT “L” Output
Current
CE “H” Level
CE “ L” Level
CE “ H” Input Current
CE “ L“ Input Current
Maximum Oscillator Frequency
Oscillator Duty Cycle
V
LX
Voltage Limit
Notes:
F
MAX
D
OSC
On (V
LX
” L” ) side
LX switch on
V
OUT
≤
3.5V
V
OUT
≤
3.5V
V
OUT
≤
3.5V
V
OUT
≤
3.5V
V
OUT
≤
3.5V
(1)
(2)
RT9261/A
Min
-2
--
--
--
--
--
--
--
-1.5
-2
1.5
2
0.4× V
OUT
--
--
-0.5
80
65
0.65
Typ
--
--
0.85
75
85
30
60
6
--
--
--
--
--
--
--
--
120
75
0.8
Max
+2
7
1.0
--
--
50
90
10
--
--
--
--
--
0.2
0.5
--
160
85
1.0
Units
%
V
V
%
µA
µA
mA
mA
V
V
µA
µA
KHz
%
V
Symbol
∆V
OUT
V
IN
V
ST
Test Conditions
I
OUT
= 1mA, V
IN
: 0
→
2V
3.5V
<
V
OUT
≤
5V
(1)
3.5V
<
V
OUT
≤
5V
(1)
(2)
To be measured at V
IN
at
no load
To be measured at V
OUT
in
switch off condition
V
EXT
= V
OUT
– 0.4V
V
EXT
= 0.4V
V
IN
= V
OUT
×
0.9
V
IN
= V
OUT
×
0.9
CE = V
OUT
CE = 0V
3.5V
<
V
OUT
≤
5V
(1)
(2)
3.5V
<
V
OUT
≤
5V
(1)
(2)
3.5V
<
V
OUT
≤
5V
(2)
(1) Unless otherwise provided, V
IN
= 1.8V, VSS = 0V, I
OUT
= 10mA, T
OPT
= 25°C, and use External Circuit of
Typical Application
(2) Unless otherwise provided, V
IN
= 3V, VSS = 0V, I
OUT
= 10mA, T
OPT
= 25°C, and External Circuit of Typical
Application
DS9261/A-03 January 2002
www.richtek-ic.com.tw
5
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
