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PDF RT9273 Data sheet ( Hoja de datos )
| Número de pieza | RT9273 | |
| Descripción | OLED + LED Driver | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT9273 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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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
1 page  
Preliminary
RT9273
Absolute Maximum Ratings (Note 1)
z Input Supply Voltage ----------------------------------------------------------------------------------------------------- −0.3V to 6V
z LX ---------------------------------------------------------------------------------------------------------------------------- −0.3V to 18V
z CH1, CH2, and OVP ----------------------------------------------------------------------------------------------------- −0.3V to 18V
z The Other Pins ------------------------------------------------------------------------------------------------------------ −0.3V to 6V
z Power Dissipation, PD @ TA = 25°C, TJ = 125°C
VDFN-10L 3x3 ------------------------------------------------------------------------------------------------------------ 2.083W
z Package Thermal Resistance (Note 2)
VDFN-10L 3x3, θJA ------------------------------------------------------------------------------------------------------ 48°C/W
z Operating Junction Temperature Range ----------------------------------------------------------------------------- −40°C to 85°C
z Junction Temperature Range ------------------------------------------------------------------------------------------- −40°C to 125°C
z Storage Temperature Range ------------------------------------------------------------------------------------------- −65°C to 150°C
z Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------ 260°C
Recommended Operating Conditions (Note 3)
z Input Supply Voltage ----------------------------------------------------------------------------------------------------- 2.7V to 4.5V
z Output Voltage ------------------------------------------------------------------------------------------------------------ Under 16V
z Output Current ------------------------------------------------------------------------------------------------------------ Under 80mA
z Maximum Output Power ------------------------------------------------------------------------------------------------ Under 1.28W
Electrical Characteristics
(VCC = 3.7V, TA = 25°C, Unless Otherwise specification)
Parameter
Symbol
Test Condition
System Supply
Supply Current
Shut Down Current
Maximum Duty Cycle
Reference Voltage
Feedback Voltage 1
Feedback Voltage 2
Power Switch MOSFET
On Resistance of MOSFET
Current Limitation
Internal MOSFET Selection
On Resistance of CH1 MOSFET
On Resistance of CH2 MOSFET
SP Low Level Voltage
SP High Level Voltage
SP signal change delay time
Protection
ICC
ICC
VFB1
VFB2
RDS(ON)
IMAX
RDS(ON)
RDS(ON)
VSP
VSP
RDS(ON)
VCC=3.7V, Switching, VFB=0V
VCC=3.7V, VEN<0.4V
Normal Operation
LX off time as SP change
OVP Threshold
Over Temperature Protection
Shut Down Voltage
Enable Voltage
OVP
OTP
VEN
VEN
Min
--
--
85
0.285
0.285
--
--
--
--
--
1.5
--
16
--
--
1.5
Typ
--
--
90
0.300
0.300
0.5
1.5
6
4.0
--
--
0.5
17
170
--
--
Max
2
1
--
0.315
0.315
1
--
9
6
0.4
--
1
19
--
0.4
--
Units
mA
uA
%
V
V
Ω
A
Ω
Ω
V
V
ms
V
°C
V
V
DS9273-09 August 2007
www.richtek.com
5
5 Page 
Preliminary
RT9273
Logic control and application circuit for LED and OLED turning on simultaneously + PWM dimming control for
LED
To achieve LEDs and OLED turning on simultaneously, the following application circuit (Figure 6) provides another
solution by simple logic control (Table 2).
CIN
VIN 2.2uF
WLED_ON
R1
4.7k
EL_ON
L1
4.7uH SS0520
COUT
2.2uF
VCC LX
OVP
CH1
EN
RT9273
SP CH2
FB2
FB1
GND
R2
1M
R3
300
WLED_ON
R7
R5 R6 100k
16 24k
Dimm
Figure 6. Application circuit for LED and OLED turning on simultaneously
Table 2. Truth table for Figure 6
WLED_ON EL_ON DIMM
M & S turn on simultaneously Normal
H
HH
M & S turn on simultaneously Dimming
Main ONLY Normal
--
H
-- --
LH
Main ONLY Dimming
PWM
L
H
Sub ONLY Normal
Sub ONLY Dimming
SHUT DOWN
L HH
L HL
L L Don’t care
Function
VOUT = 16V,
ILED = [VOUT - 3VF(LED)]/R3 mA
--
VOUT = 9.5V, ILED = 18.5 mA
V OUT = 9.5V,
ILED = depends on PWM
VOUT = 13V, ILED = 0 mA
VOUT = 16V, ILED = 0 mA
VOUT = 0V, ILED = 0 mA
DS9273-09 August 2007
www.richtek.com
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet RT9273.PDF ] | |
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