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  Richtek Technology Electronic Components Datasheet  

RT9273 Datasheet

OLED + LED Driver

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Preliminary
RT9273
High Performance, OLED + LED Driver for Dual Panel
Mobile Phone
General Description
The RT9273 is a high efficiency step-up DC-DC converter
specifically designed for dual panel mobile phone
applications.
According to SP status, RT9273 can either regulates
output current flowing through series-connected LEDs or
regulate output voltage applying to OLED with a common
output LC filter. This along with compact VDFN-10L 3x3
package and high switching frequency allows less part
count and smaller external components for space and cost
saving.
Pulling low EN pin shuts down the chip and reduces the
supply current to less than 1μA. The EN pin also accepts
PWM signal for LED brightness dimming control. The
averaged LED current is well proportional to the duty cycle
of the PWM signal. The internal soft start reduces inrush
current during EN turning on or PWM dimming control.
Other features include OVP, OCP and OTP. OVP prevents
the damages in case of feedback loop open.
Ordering Information
RT9273
Package Type
QV : VDFN-10L 3x3 (V-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Note :
Richtek Pb-free and Green products are :
`RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
`Suitable for use in SnPb or Pb-free soldering processes.
`100% matte tin (Sn) plating.
Features
z Lion-Battery operating Range : 2.7V to 4.5V
z Maximum Output Voltage Up to 16V
z Share One Set of Inductor and Schottky Diode for
2 Channels
z Programmable Dimming Function by EN pin with
200Hz to 1kHz
z Internal Soft-Start Function to Avoid PWM Dimming
Noise.
z Zero Shut Down Supply Current
z Complete Protection : OVP, OCP, OTP and SS
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Dual panel mobile phone, with LED backlight
Pin ConFigurations
(TOP VIEW)
GND 1
FB2 2
CH2 3
VCC 4
CH1 5
10 LX
9 SP
8 OVP
7 EN
11 6 FB1
VDFN-10L 3x3
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area, otherwise visit our website for detail.
DS9273-09 August 2007
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9273 Datasheet

OLED + LED Driver

No Preview Available !

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.
www.richtek.com
2
DS9273-09 August 2007


Part Number RT9273
Description OLED + LED Driver
Maker Richtek
PDF Download

RT9273 Datasheet PDF






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