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