RT9285C Datasheet, PDF (1/13 Pages) Richtek Technology Corporation – Tiny Package, High Performance, Diode Embedded White LED Driver

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 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.
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 V_IN 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
6
5
4
1
2
3
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.
DS9285C-00 August 2007
www.richtek.com
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