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PDF RT9368 Data sheet ( Hoja de datos )
| Número de pieza | RT9368 | |
| Descripción | 4-Channel Charge Pump White LED Driver | |
| Fabricantes | Richtek | |
| Logotipo |  |
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RT9368
4-Channel Charge Pump White LED Driver with Low
Dropout Current Source
General Description
Features
The RT9368 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
RT9368 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 PWM dimming control. The dimming of
white LEDs current can be achieved by applying a PWM
signal to the EN pin.
RT9368 is available in a WQFN 3x3-16L package.
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 PWM Dimming Control
z Low Input Noise and EMI
z RoHS Compliant and 100% Lead (Pb)-Free
Ordering Information
RT9368
Package Type
QW : WQFN-16L 3x3 (W-Type)
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.
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Applications
z Mobile Phone, DSC, MP3
z White LED Backlighting
z LCDDisplay Supply
Pin Configurations
(TOP VIEW)
LED4
NC
GND
C1P
1
2
3
4
16 15 14 13
12 EN
11 ISET
10 GND
17
9 C2P
5678
WQFN-16L 3x3
DS9368-07 April 2011
www.richtek.com
1
Free Datasheet http://www.datasheet4u.com/
1 page  
RT9368
Parameter
Symbol
Test Condition
Enable
EN Threshold Voltage Logic-High VIH
Logic-Low VIL
EN Current
Logic-High IIH
Logic-Low IIL
VIH = VIN
VIL = GND
EN Low Time for Shut Down
TSHDN PWM Dimming
Frequency
PWM Dimming Frequency
fPWM Minimum Turn On > 30μs
Oscillator Frequency
fOSC
Min Typ Max Units
1.5 -- -- V
-- -- 0.4 V
-- 1 10 μA
-- 1 10 μA
-- 8 -- ms
250 -- 32k Hz
-- 250 -- kHz
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 highly recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
DS9368-07 April 2011
www.richtek.com
5
Free Datasheet http://www.datasheet4u.com/
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet RT9368.PDF ] | |
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