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PDF RT9373A Data sheet ( Hoja de datos )
| Número de pieza | RT9373A | |
| Descripción | 3-Channel Charge Pump White LED Driver | |
| Fabricantes | Richtek | |
| Logotipo |  |
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RT9373A
3-Channel Charge Pump White LED Driver with Low
Dropout Current Source
General Description
Features
The RT9373A 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
RT9373A 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 3 White LEDs
z Support Up to 60mA 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
RT9373A is available in a WQFN3x3-16L package.
Applications
Ordering Information
RT9373A
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.
Marking Information
NC
NC
GND
C1P
1
2
3
4
16 15 14 13
12 EN
11 NC
10 GND
17
9 C2P
5678
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
WQFN-16L 3x3
DS9373A-04 April 2011
www.richtek.com
1
1 page  
RT9373A
Parameter
EN Low Time for Dimming
EN High Time for Dimming
High Current
EN Current
Low Current
EN Low Time for Shut Down
Frequency
Oscillator Frequency
Symbol
Test Condition
TIL
TIH
IIH
IIL
TSHDN
VIH = VIN
VIL = GND
Pulse Dimming
fOSC
Min Typ Max Units
0.5 -- 500 us
0.5 --
-- us
-- 1 10 uA
-- 1 10 uA
-- 2 -- ms
-- 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.
DS9373A-04 April 2011
www.richtek.com
5
5 Page 
Outline Dimension
D
E
SEE DETAIL A
D2
L
1
E2
RT9373A
eb
11
22
A
A3
A1
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
0.700
0.800
0.000
0.050
0.175
0.250
0.180
0.300
2.950
3.050
1.300
1.750
2.950
3.050
1.300
1.750
0.500
0.350
0.450
Dimensions In Inches
Min Max
0.028
0.031
0.000
0.002
0.007
0.010
0.007
0.012
0.116
0.120
0.051
0.069
0.116
0.120
0.051
0.069
0.020
0.014
0.018
W-Type 16L QFN 3x3 Package
Richtek Technology Corporation
Headquarter
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
Richtek Technology Corporation
Taipei Office (Marketing)
5F, No. 95, Minchiuan Road, Hsintien City
Taipei County, Taiwan, R.O.C.
Tel: (8862)86672399 Fax: (8862)86672377
Email: [email protected]
Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit
design, specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be
guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek.
DS9373A-04 April 2011
www.richtek.com
11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet RT9373A.PDF ] | |
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