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PDF RT9363 Data sheet ( Hoja de datos )
| Número de pieza | RT9363 | |
| Descripción | Smallest 60mA 3-Channel Charge Pump White LED Driver | |
| Fabricantes | Richtek | |
| Logotipo |  |
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RT9363
Smallest 60mA 3-Channel Charge Pump White LED Driver
with Low Dropout Current Source
General Description
The RT9363 is a high efficiency and cost effective charge
pump white LED driver. It supports up to 3 white LEDs
with regulated constant current for uniform intensity. The
RT9363 maintains the highest efficiency by utilizing a
x1/x2 charge pump and low dropout current regulators.
User can easily configure each LED current up to 20mA by
a pulse dimming control. The dimming of white LEDs
current can be achieved by applying a pulse signal to the
EN pin. There are totally 16 steps of current could be set
by users.
The operating voltage range is 2.8V to 5.0V. Internal soft
start circuitry effectively reduces the inrush current while
both start-up and mode transition. RT9363 also provides
comprehensive protections such as short circuit protection.
The load is disconnected from VIN while shutdown and
the shutdown current is less than 10μA.
RT9363 is available in a TSOT-23-8 package (1.0mm max
height).
Ordering Information
RT9363
Package Type
J8 : TSOT-23-8
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Note :
Richtek 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.
Features
z Very High Efficiency Over 80% of Battery Life
z Support up to 3 White LEDs
z Support up to 60mA Output Current
z 1% Typical LED Current Matching
z Soft Start Function
z Short Circuit Protection Function
z Auto Charge Pump Mode Selection
z 250kHz Fixed Frequency Oscillator
z Output Over Voltage Protection
z 16-Step Brightness Control
z Low Input Noise and EMI
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Mobile Phone, DSC, MP3
z White LED Backlighting
z LCDDisplay Supply
Pin Configurations
(TOP VIEW)
87 6 5
2 34
TSOT-23-8
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
DS9363-03 April 2011
www.richtek.com
1
Free Datasheet http://www.datasheet4u.com/
1 page  
RT9363
Parameter
EN High Time for Dimming
EN High Time for Holding
Over Voltage Protection
Symbol
THI
THO
VOVP
Test Conditions
(Note 5)
Open circuit at any LED that is
programmed to be in the on state
Min Typ Max Unit
0.1 -- 0.3 ms
0.1 --
-- ms
-- 5.5 --
V
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. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. EN High time after the dimming sequence has being completed.
Note 6. ILED Accaracy = 100% x (ILED1/2/3 − 20mA).
Note 7. Current Matching = (ILED(MAX/MIN) − ILED, AVG) / ILED, AVG.
DS9363-03 April 2011
www.richtek.com
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
RT9363
Output capacitor (COUT) should
be placed close to VOUT and
connected to ground plane.
All the traces of LED and VIN running from
chip to LEDs should be wide and short to
reduce the parasitic connection resistance
and shielded, isolated by ground plane .
Input capacitor (CIN) should
be placed close to VIN and
connected to ground plane.
The Anodes of LEDs must
connect to CIN, not battery
directly.
COUT
Battery
CIN
LED3
VOUT
GND
VIN
1
2
3
4
8 LED2
7 LED1
6 EN
RS
CP
5 CP
CS
Ground Plane
The GND should be connected The traces running from pins to flying capacitor
to a strong ground plane for heat should be short and wide to reduce parasitic
sinking and noise protection.
resistance and prevent noise radiation. Long
parallel traces of EN and LED1 should be
prevented to reduce the noise coupling from
EN to LED1.
Figure 6. PCB Layout Guide.
Figure 7. PCB Layout Top Layer.
DS9363-03 April 2011
Figure 8. PCB Layout Bottom Layer.
www.richtek.com
11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT9363.PDF ] | |
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