RT9261/A
Absolute Maximum Ratings
Output Voltage
LX Pin Voltage
CE Pin Voltage
(1)
(2)
Preliminary
8V
8V
-0.3 to V
OUT
+0.3V
(1)
EXT Pin Voltage
(3)
-0.3 to V
OUT
+0.3V
250mA
±50mA
0.5W
0.25W
100°C/W
300°C/W
250°C/W
-20 to +85°C
165°C
260°C
CB
CB
CB
LX Pin Output Current
EXT Pin Current
SOT-89
SOT-25
(2)
Power Dissipation, P
D
@ T
A
= 25°C
Package Thermal Resistance
SOT-89,
θ
JC
SOT-89,
θ
JA
SOT-25,
θ
JA
Operating Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10 sec.)
Notes:
(1) Applicable to RT9261-
(2) Applicable to RT9261A-
(3) Applicable to RT9261-
CX and RT9261-
CX and RT9261A-
CB and RT9261A-
Electrical Characteristics
(Refer to Fig. 1)
Parameter
Output Voltage Accuracy
Input Voltage
Start-up Voltage
Hold-on Voltage
Input Current 1
Input Current 2
LX Switching Current
LX Leakage Current
Maximum Oscillator
Oscillator Duty Cycle
Efficiency
V
LX
Voltage Limit
Notes:
(1) V
IN
= 1.8V, VSS = 0V, I
OUT
= 10mA, T
OPT
= 25°C, and External Circuit of Typical Application
(2) V
IN
= 3V, VSS = 0V, I
OUT
= 10mA, T
OPT
= 25°C, and External Circuit of Typical Application
www.richtek-ic.com.tw
DS9261/A-03 January 2002
(1)
(2)
Symbol
∆V
OUT
V
IN
V
ST
V
HO
Test Conditions
Min
-2
--
Typ
--
--
0.85
--
15
18
5
--
--
--
120
75
75
0.8
Max Units
+2
7
1.0
--
18
24
8
--
--
0.5
160
85
--
1.0
%
V
V
V
µA
µA
mA
µA
KHz
%
%
V
I
OUT
= 1mA, V
IN
: 0
→
2V
I
OUT
= 1mA, V
IN
: 2
→
0V
To be measured at V
IN
at
no load
To be measured at V
OUT
in switch off condition
--
0.7
--
--
--
60
80
--
80
65
--
0.65
V
OUT
≤
3.5V
3.5V
<
V
OUT
≤
5V
V
OUT
≤
3.5V
(1)
(2)
I
SWITCHING
3.5V
<
V
OUT
≤
5V
V
LX
= 0.4V
V
LX
= 6V
On ( V
LX
” L ” ) side
L
X
switch on
I
LEAKAGE
F
MAX
D
OSC
2
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