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