RT9261B
Parameter
Output Voltage Accuracy
Input Voltage
Start-up Voltage
Hold-on Voltage
Efficiency
Input Current 1
(1) (2)
(1)
(2)
Preliminary
Electrical Characteristics
(Refer to Fig. 2)
Symbol
∆V
OUT
V
IN
V
ST
V
HO
V
OUT
≤
3.5V
I
OUT
= 1mA, V
IN
: 0
→
2V
I
OUT
= 1mA, V
IN
: 2
→
0V
Test Conditions
Min
-2
--
--
0.7
--
To be measured at V
IN
in
continuous switching
To be measured at V
OUT
in switch off condition
V
OUT
≤
3.5V
(1)
(2)
Typ
--
--
0.8
--
80
24
36
6.5
18
20
--
--
--
--
--
--
--
190
75
0.8
Max Units
+2
7
1
--
--
36
45
10
36
45
--
--
0.5
--
0.2
0.5
--
240
85
1.0
µA
%
V
V
V
%
µA
µA
--
--
--
--
--
120
160
--
0.4×V
OUT
--
--
-0.5
140
65
0.65
3.5V
<
V
OUT
≤
5V
Input Current 2
Input Current 3
3.5V
<
V
OUT
≤
5V
LX Switching Current
LX Leakage 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:
V
OUT
≤
3.5V
(1)
To be measured at V
IN
in
no load (guaranteed by I
1
and I
2
)
I
SWITCHING
V
LX
= 0.4V
I
LEAKAGE
V
LX
= 6V
V
IN
= V
OUT
* 0.9
V
IN
= V
OUT
* 0.9
CE = V
OUT
CE = 0V
F
MAX
D
OSC
On (V
LX
“L”) side
LX switch on
3.5V
<
V
OUT
≤
5V
(2)
mA
µA
V
V
µA
µA
KHz
%
V
(1) V
IN
= 1.8V, V
SS
= 0V, I
OUT
= 1mA, Topt = 25°C, and External Circuit of Typical Application
(2) V
IN
= 3V, V
SS
= 0V, I
OUT
= 1mA, Topt = 25°C, and External Circuit of Typical Application
www.richtek-ic.com.tw
DS9261B-03 September 2001
4
ETC [ ETC ]
