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PDF RT9368A Data sheet ( Hoja de datos )
| Número de pieza | RT9368A | |
| Descripción | 4-Channel Charge Pump White LED Driver | |
| Fabricantes | Richtek | |
| Logotipo |  |
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RT9368A
4-Channel Charge Pump White LED Driver with Low
Dropout Current Source
General Description
Features
The RT9368A is a high efficiency and cost effective charge
pump white LED driver. It supports up to 4 white LEDs
with regulated constant current for uniform intensity. The
RT9368A maintains the highest efficiency by utilizing a
x1/x1.5/x2 charge pump and low dropout current
regulators.
User can easily configure each LED current from 1.25mA
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.
z Very High Efficiency Over 80% of Battery Life
z Support up to 4 White LEDs
z Support up to 80mA Output Current
z 1% Typical LED Current Matching
z Soft Start Function
z Auto Charge Pump Mode Selection
z 250kHz Fixed Frequency Oscillator
z Output Over Voltage Protection
z 16 Steps Brightness Control
z Low Input Noise and EMI
z RoHS Compliant and 100% Lead (Pb)-Free
RT9368A is available in a WQFN3x3-16L package.
Applications
Ordering Information
RT9368A
Package Type
QW : WQFN-16L 3x3 (W-Type)
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
z Mobile Phone, DSC, MP3
z White LED Backlighting
z LCDDisplay Supply
Pin Configurations
(TOP VIEW)
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.
LED4
NC
GND
C1P
1
2
3
4
16 15 14 13
12 EN
11 NC
10 GND
17
9 C2P
5678
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
WQFN-16L 3x3
DS9368A-06 April 2011
www.richtek.com
1
Free Datasheet http://www.datasheet4u.com/
1 page  
RT9368A
Absolute Maximum Ratings (Note 1)
z Supply Input Voltage ------------------------------------------------------------------------------------------------------ −0.3V to 6V
z Other I/O Pin Voltage ----------------------------------------------------------------------------------------------------- −0.3V to 6V
z Power Dissipation, PD @ TA = 25°C
WQFN-16L 3x3 ------------------------------------------------------------------------------------------------------------ 1.47W
z Package Thermal Resistance (Note 2)
WQFN-16L 3x3, θJA ------------------------------------------------------------------------------------------------------- 68°C/W
z Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
z Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
z Storage Temperature Range -------------------------------------------------------------------------------------------- −40°C to 150°C
z ESD Susceptibility (Note 3)
HBM (Human Body Mode) ---------------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------------ 200V
Recommended Operating Conditions (Note 4)
z Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C
z Ambient Temperature Range -------------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VIN = 2.5V to 5.5V, CIN = COUT = CFLY = 1uF (ESR = 30mΩ), TA = 25°C, unless otherwise specification)
Parameter
Symbol
Test Condition
Input
Input Supply Voltage
Under-voltage Lockout
Threshold
VIN
VIN Rising
Under-voltage Lockout
Hysteresis
Quiescent of x1 Mode
Quiescent of x2 Mode
IQ_x1
IQ_x2
x1 Mode, No Load, All LED pins
connected to GND, VIN = 4V
x2 Mode, No Load, All LED pins floating,
VIN = 3.5V
Shutdown Current
Enable = 0.4V, VIN = 2.8V to 5.5V
x1 mode to x1.5 mode
Transition Voltage (VIN falling)
x1.5 mode to x2 mode
Transition Voltage (VIN falling)
Hysteresis of Mode Transition
VTS_x1.5 VF = 3.5V, IOUT = 80mA, ILEDx = 20mA
VTS_x2 VF = 3.5V, IOUT = 80mA, ILEDx = 20mA
Min
2.8
1.6
--
0.5
1.5
0
--
--
--
Typ
--
2.1
100
1
2.5
0.1
3.75
3.0
150
Max Units
5.0 V
2.5 V
-- mV
2 mA
5 mA
10 uA
-- V
-- V
-- mV
Output
Current Range of ILEDx
ILEDx Accuracy
Current Matching
2.8 < VIN < 5.5@VF = 3.2, IOUT = 60mA
3.0 < VIN < 5.5@VF = 3.4, IOUT = 80mA
3.3 < VIN < 5.5@VF = 3.8, IOUT = 80mA
ILED-ERR 100% Setting
100% Setting
1.25
−8
−5
--
--
--
20 mA
+8 %
+5 %
To be continued
DS9368A-06 April 2011
www.richtek.com
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
RT9368A
Layout Consideration
The RT9368A is a low dropout current source for white LED driver. Careful PCB layout is necessary. For best performance,
place all peripheral components as close to the IC as possible. A short connection is highly recommended. The following
guidelines should be strictly followed when designing a PCB layout for the RT9368A.
1. All the traces of LED pins running from chip to LEDs should be wide and short to reduce the parasitic connection
resistance.
2. Input capacitor (CIN) should be placed close to VIN (Pin 5) and connected to ground plane. The trace of VIN in the PCB
should be placed far away the sensitive devices or shielded by the ground.
3. The GND should be connected to a strong ground plane for heat sinking and noise protection.
4. Output capacitor (COUT) should be placed close to VOUT and connected to ground plane to reduce noise coupling from
charge pump to LEDs.
5. The traces running from pins to flying capacitor should be short and wide to reduce parasitic resistance and prevent
noise radiation.
All the traces of LED pins
running from chip to LEDs
should be wide and short to
reduce the parasitic
connection resistance.
LED4 1
NC 2
GND 3
C1P 4
12 EN
11 NC
10 GND
9 C2P
The GND should be
connected to a strong
ground plane for heat
sinking and noise
protection.
C1
The traces running from pins
to flying capacitor should be
short and wide to reduce
parasitic resistance and
prevent noise radiation.
CIN
Ground Plane
Battery
DS9368A-06 April 2011
C2
COUT
Output capacitor (COUT)
should be placed close to
VOUT and connected to
ground plane to reduce
noise coupling from
charge pump to LEDs.
Input capacitor (CIN) should be placed close to VIN
(Pin 5) and connected to ground plane. The trace
of VIN in the PCB should be placed far away the
sensitive devices or shielded by the ground.
Figure 5
www.richtek.com
11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT9368A.PDF ] | |
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