RT9285A Datasheet, PDF (1/6 Pages) Richtek Technology Corporation – Tiny Package, High Performance, Diode Embedded White LED Driver

Product specification
RT9285A/B
General Description
The RT9285 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 and
WDFN-8L 2x2 packages provide the best solution for PCB
space saving and total BOM cost.
Ordering Information
RT9285
Package Type
QW : WDFN-8L 2x2 (W-Type)
J6 : TSOT-23-6
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Dimming
A : Digital Pulse Dimming
B : PWM Clock Dimming
Features
l V_IN Operating Range : 2.7V to 5.5V
l Up to 85% Efficiency
l 22V Internal Power N-MOSFET
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 and 8-Lead 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)
AGND 1
LX 2
NC 3
PGND 4
8 FB
7 EN
6 VOUT
9 _{5 VDD}
WDFN-8L 2x2
VDD VOUT EN
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.
http://www.twtysemi.com
[e-mail]
4008-318-123
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