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PDF RT9272 Data sheet ( Hoja de datos )
| Número de pieza | RT9272 | |
| Descripción | Constant Current LED Driver | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Preliminary
RT9272
High Performance, Constant Current LED Driver
for Dual Panel Mobile Phone
General Description
The RT9272 is a high efficiency step-up DC-DC converter
specifically designed for dual panel mobile phone
applications.
According to SP status, RT9272 can either regulates output
current flowing through series-connected LEDs for main
panel or for sub panel 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
RT9272
Package Type
QV : VDFN-10L 3x3 (V-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
Note :
RichTek Pb-free 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.
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.
Features
z Low VIN Operating Range : 2.7V to 4.5V
z Maximum Output Voltage up to 16V
z Small LC filter by 1.1MHz Operation Frequency
z Share One Set of Inductor and Schottky Diode for
2 Channels
z Programmable Dimming Function by EN Pin with
100Hz to 1kHz
z 40μA Quiescent Current (Switch-Off)
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
6 FB1
VDFN-10L 3x3
Typical Application Circuit
CIN
2.2uF
L SS0520
4.7uF DSH
VIN
4 10
VCC LX
Chip Enable
7
9
EN
SP
RT9272
OVP
CH1
CH2
8
5
3
R1 6 FB1
FB2 2 R2
GND
1
COUT
1uF
Sub-Panel
Main Panel
Figure 1. 2LEDs for Sub panel and 3LEDs for Main panel
DS9272-06 November 2005
www.richtek.com
1
1 page  
Preliminary
RT9272
Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational
sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may
remain possibility to affect device reliability.
Note 2. θJA is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
Note 3. The device is not guaranteed to function outside its operating conditions.
DS9272-06 November 2005
www.richtek.com
5
5 Page 
Outline Dimension
Preliminary
RT9272
D2
D
L
E E2
SEE DETAIL A
1
eb
A
A3
A1
21
21
DETAIL A
Pin #1 ID and Tie Bar Mark Options
Note : The configuration of the Pin #1 identifier is optional,
but must be located within the zone indicated.
Symbol
A
A1
A3
b
D
D2
E
E2
e
L
Dimensions In Millimeters
Min Max
0.800
1.000
0.000
0.050
0.175
0.250
0.180
0.300
2.950
3.050
2.300
2.650
2.950
3.050
1.500
1.750
0.500
0.350
0.450
Dimensions In Inches
Min Max
0.031
0.039
0.000
0.002
0.007
0.010
0.007
0.012
0.116
0.120
0.091
0.104
0.116
0.120
0.059
0.069
0.020
0.014
0.018
V-Type 10L DFN 3x3 Package
RICHTEK TECHNOLOGY CORP.
Headquarter
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
DS9272-06 November 2005
RICHTEK TECHNOLOGY CORP.
Taipei Office (Marketing)
8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City
Taipei County, Taiwan, R.O.C.
Tel: (8862)89191466 Fax: (8862)89191465
Email: [email protected]
www.richtek.com
11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet RT9272.PDF ] | |
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