Preliminary
RT9285C
Tiny Package, High Performance, Diode Embedded White
LED Driver
General Description
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 R
SET
, 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.
Features
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V
IN
Operating Range : 2.7V to 5.5V
Up to 85% Efficiency
22V Internal Power NMOS
1MHz Switching Frequency
Built-in Diode
Digital Dimming with Zero-Inrush
Input UVLO Protection
Output Over Voltage Protection
Internal Soft Start and Compensation
TSOT-23-6, 8-Lead XDFN and WDFN Package
RoHS Compliant and 100% Lead (Pb)-Free
Applications
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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 :
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Cellular Phones
Digital Cameras
PDAs and Smart Phones
Porbable Instruments
MP3 Player
OLED Power
Pin Configurations
(TOP VIEW)
VDD VOUT EN
GND
}
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.
GND
1
LX
2
NC
3
PGND
4
8
7
6
5
9
FB
EN
VOUT
VDD
6
1
LX
5
2
GND
4
3
FB
XDFN/WDFN-8L 2x2
TSOT-23-6
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.
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.
DS9285C-00 August 2007
www.richtek.com
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RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
