RT9273 데이터 시트보기 (PDF) - Richtek Technology
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RT9273 Datasheet PDF : 14 Pages
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RT9273
Preliminary
Typical Application Circuit
DSH
CIN
VIN 2.2uF
Schottky
L
diode
Chip Enable
4
10
VCC LX
7 EN
OVP 8
CH1 5
9
RT9273
SP
CH2
FB2
3
2
GND FB1 6
COUT
2.2uF
1
R1
VOUT
R2
300k
R3
Figure 1. Dual panel 2LEDs + OLED mobile phone power solution
CIN
VIN 2.2uF
DSH
Schottky
L
diode
4
10
VCC LX
Chip Enable
7 EN
OVP 8
CH1 5
9
RT9273
SP
CH2
FB2
3
2
GND FB1 6
1
R1
COUT
2.2uF
VOUT
R2
300k
R3
Figure 2. Dual panel 3LEDs + OLED mobile phone power solution
CIN
VIN 2.2uF
DSH
Schottky
L
diode
4
10
VCC LX
Chip Enable
7 EN
OVP 8
CH1 5
9
RT9273
SP
CH2
FB2
3
2
GND FB1 6
1
R1
COUT
2.2uF
VOUT
R2
300k
R3
Figure 3. Dual panel 3LEDs + OLED mobile phone power solution. OLED is controlled by its driver to turn on/off.
Note:
1. Figure 1 is for PMOLED power ground connected to CH2 but not for OLED driver digital ground.
2. R3 = 7.68k for VOUT = 12V & 9.31k for VOUT = 10V
3. L: Measured by Murate LQH32C series 4.7μH with DCR = 0.15Ω
4. a. OLED turns on procedure: Firstly, EN pin pulls high and then SP pin pulls High. Finally set the OLED display to turn ON.
b. OLED turns off procedure: Firstly set OLED display to turn OFF. And then SP pin pulls low but at the same time LED will
turn on. Or keep the SP status and finally let the EN pin pull low.
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2
DS9273-09 August 2007
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