RT9284A/B
Tiny Package, High Performance, Constant Current
Switching Regulator for White LED
General Description
The RT9284A/B is a compact, high efficient and high
integration LED driver. Internal 22V MOSFET can support
2 to 5 White LEDs for backlighting and camera flashing.
Highly integration and internal compensation network
minimizes as 5 external component counts. Optimized
operation frequency can meet the requirement of small
LC filters value and low operation current with high
efficiency. Internal soft start function can reduce the inrush
current. Tiny package type of TSOT-23-5 and TSOT-23-6
packages provide the best solution for PCB space saving
and total BOM cost.
Features
V
IN
Operating Range : 2.7V to 5.5V
Maximum Output Voltage up to 20V
Dimming with Zero-inrush and Wide Frequency
Range of 100 to 100kHz
Over Voltage Protection
Output Current up to 100mA at V
OUT
= 12V.
Zero Shutdown Supply Current
Minimize the External Component
Small LC Filter
Internal Soft Start
RoHS Compliant and 100% Lead (Pb)-Free
Ordering Information
RT9284 (-
)
Package Type
J5 : TSOT-23-5
J6 : TSOT-23-6
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with
Commercial Standard)
OVP Voltage
15 : 15V
20 : 20V
FB Voltage
A : 1.235V
B : 0.25V
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.
Applications
Camera Flash White LED
Mobile Phone, Smart Phone LED Backlight
PDA LED Backlight
Digital Still Camera
Camcorder
Pin Configurations
TOP VIEW
VDD
5
1
LX
2
GND
EN
4
3
FB
TSOT-23-5
VDD OVP
6
1
LX
5
2
GND
EN
4
3
FB
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.
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.
DS9284A/B-05 August 2007
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
