RT9261 Datasheet, PDF (5/14 Pages) Richtek Technology Corporation – VFM Step-up DC/DC Converter

Preliminary
RT9261/A
Electrical Characteristics (Refer to Fig. 4)
Parameter
Symbol
Test Conditions
Min Typ Max Units
Output Voltage Accuracy
∆V_OUT
-2
-- +2 %
Input Voltage
V_IN
--
--
7
V
Start-up Voltage
Efficiency
Input Current 1
Input Current 2
EXT “H” Output
Current
EXT “L” Output
Current
V_ST
V_OUT ≤ 3.5V ⁽¹⁾
3.5V < V_OUT ≤ 5V ⁽²⁾
V_OUT ≤ 3.5V ⁽¹⁾
3.5V < V_OUT ≤ 5V ⁽²⁾
V_OUT ≤ 3.5V ⁽¹⁾
3.5V < V_OUT ≤ 5V ⁽²⁾
V_OUT ≤ 3.5V ⁽¹⁾
3.5V < V_OUT ≤ 5V ⁽²⁾
V_OUT ≤ 3.5V ⁽¹⁾
3.5V < V_OUT ≤ 5V ⁽²⁾
I_OUT = 1mA, V_IN : 0 → 2V
--
--
--
To be measured at V_IN at
--
no load
--
To be measured at V_OUT in
switch off condition
--
-1.5
V_EXT = V_OUT – 0.4V
-2
1.5
V_EXT = 0.4V
2
0.85 1.0 V
75 --
%
85 --
30 50
µA
60 90
6 10 µA
--
--
mA
--
--
--
--
mA
--
--
CE “H” Level
V_IN = V_OUT × 0.9
0.4× V_OUT --
--
V
CE “ L” Level
V_IN = V_OUT × 0.9
--
-- 0.2 V
CE “ H” Input Current
CE = V_OUT
--
-- 0.5 µA
CE “ L“ Input Current
CE = 0V
-0.5
--
-- µA
Maximum Oscillator Frequency
F_MAX
80
120 160 KHz
Oscillator Duty Cycle
D_OSC On (V_LX ” L” ) side
65
75 85 %
V_LX Voltage Limit
LX switch on
0.65 0.8 1.0 V
Notes:
(1) Unless otherwise provided, V_IN = 1.8V, VSS = 0V, I_OUT = 10mA, T_OPT = 25°C, and use External Circuit of
Typical Application
(2) Unless otherwise provided, V_IN = 3V, VSS = 0V, I_OUT = 10mA, T_OPT = 25°C, and External Circuit of Typical
Application
DS9261/A-03 January 2002
www.richtek-ic.com.tw
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