Preliminary
RT9261B
Electrical Characteristics (Refer to Figure 2)
Parameter
Output Voltage Accuracy
Input Voltage
Symbol
Test Conditions
Min
-2
Typ Max Units
--
--
+2
7
%
V
ΔV
OUT
--
V
V
V
IN
Start-up Voltage
Hold-on Voltage
Efficiency
--
0.8
--
1
V
I
I
= 1mA, V : 0 → 2V
ST
OUT
IN
0.7
--
V
= 1mA, V : 2 → 0V
HO
OUT
IN
--
--
--
80
24
36
--
%
V
≤ 3.5V (1)
36
45
OUT
To be measured at V in
IN
Input Current 1
μA
μA
3.5V < V
≤ 5V (2)
continuous switching
OUT
Input Current 2 (1) (2)
--
--
6.5
18
10
36
To be measured at V
OUT
in switch off condition
V
OUT
≤ 3.5V (1)
IN
To be measured at V in
Input Current 3
μA
no load (guaranteed by I1
and I2)
3.5V < V
≤ 5V (2)
--
20
--
45
--
OUT
V
≤ 3.5V (1)
120
160
--
OUT
LX Switching Current
mA
I
I
V
= 0.4V
SWITCHING
LX
3.5V < V
≤ 5V (2)
--
--
OUT
LX Leakage Current
EN “H” Level
--
0.5
V
= 6V
μA
V
LEAKAGE
LX
IN
IN
--
--
--
--
--
0.2
0.5
--
V
= VOUT * 0.9
= VOUT * 0.9
0.4×V
OUT
EN “L” Level
--
--
V
V
EN “H” Input Current
EN “ L” Input Current
EN = VOUT
EN = 0V
μA
μA
-0.5
140
140
65
190 240 kHz
190 320 kHz
V
V
= 2.5V to 5V
OUT
OUT
Maximum Oscillator Frequency
Oscillator Duty Cycle
F
MAX
= 1.5V to 2.4V
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) VIN = 1.8V, VSS = 0V, IOUT = 1mA, Topt = 25°C, and use External Circuit of Typical Application
(2) VIN = 3V, VSS = 0V, IOUT = 1mA, Topt= 25°C, and External Circuit of Typical Application
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DS9261B-12 March 2007
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
