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PDF RT9285C Data sheet ( Hoja de datos )
| Número de pieza | RT9285C | |
| Descripción | Diode Embedded White LED Driver | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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Preliminary
RT9285C
Tiny Package, High Performance, Diode Embedded White
LED Driver
General Description
Features
The RT9285C is a high frequency asynchronous boost
converter with internal diode, which can support 2 to 5
White LEDs for backlighting and OLED power supply. The
Internal soft start function can reduce the inrush current.
The device operates with 1MHz fixed switching frequency
to allow small external components and to simplify possible
EMI problems. The device comes with 20V over voltage
protection to allow inexpensive and small-output capacitors
with lower voltage rating. The LED current is initially set
with the external sense resistor RSET, and the feedback
voltage is 250 mV. Tiny package type TSOT-23-6,
XDFN-8L 2x2 and WDFN-8L 2x2 packages provide the best
solution for PCB space saving and total BOM cost.
Ordering Information
RT9285C
Package Type
QW : WDFN-8L 2x2 (W-Type)
QX : XDFN-8L 2x2 (X-Type)
J6 : TSOT-23-6
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Note :
Richtek Pb-free and Green 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.
l VIN Operating Range : 2.7V to 5.5V
l Up to 85% Efficiency
l 22V Internal Power NMOS
l 1MHz Switching Frequency
l Built-in Diode
l Digital Dimming with Zero-Inrush
l Input UVLO Protection
l Output Over Voltage Protection
l Internal Soft Start and Compensation
l TSOT-23-6, 8-Lead XDFN and WDFN Package
l RoHS Compliant and 100% Lead (Pb)-Free
Applications
l Cellular Phones
l Digital Cameras
l PDAs and Smart Phones
l Porbable Instruments
l MP3 Player
l OLED Power
Pin Configurations
(TOP VIEW)
VDD VOUT EN
GND 1
LX 2
NC 3
PGND 4
8 FB
7 EN
6 VOUT
9 5 VDD
XDFN/WDFN-8L 2x2
654
123
LX GND FB
TSOT-23-6
Note : There is no pin1 indicator on top mark for TSOT-23-6
type, and pin 1 will be lower left pin when reading top mark
from left to right.
DS9w285C-0w0 Augwust 20.07 D a t a S h e e t 4 U . c woww.ricmhtek.com
1
1 page  
Preliminary
RT9285C
Par amete r
Symbol
Test Condition
Min Typ Max Units
Pr ote ction
OVP Threshold
OCP
VOV P
-- 20 -- V
-- 400 -- mA
Control Interface
EN Threshold Logic-Low Voltage VIL
Logic-High Voltage VIH
EN Low Time for Dimming
TLO
Delay Between Steps Time
THI
EN Low Time for Shut Down
TSHDN
Refer to Figure 1
Refer to Figure 1
Refer to Figure 1
-- -- 0.4 V
1.4 -- -- V
0.5 -- 300 µs
0.5 --
-- µs
1 -- -- ms
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. Devices are ESD sensitive. Handling precaution recommended.
Note 3. The device is not guaranteed to function outside its operating conditions.
Note 4. θJA is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity test board of
JEDEC 51-3 thermal measurement standard. The case position of θJC is on the package exposed pad.
DS9285C-00 August 2007
www.richtek.com
5
5 Page 
Outline Dimension
Preliminary
D
CB
H
L
b
A
e
A1
RT9285C
Symbol
A
A1
B
b
C
D
e
H
L
Dimensions In Millimeters
Min Max
0.700
1.000
0.000
0.100
1.397
1.803
0.300
0.559
2.591
3.000
2.692
3.099
0.838
1.041
0.080
0.254
0.300
0.610
Dimensions In Inches
Min Max
0.028
0.039
0.000
0.004
0.055
0.071
0.012
0.022
0.102
0.118
0.106
0.122
0.033
0.041
0.003
0.010
0.012
0.024
TSOT-23-6 Surface Mount Package
DS9285C-00 August 2007
www.richtek.com
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet RT9285C.PDF ] | |
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