RT9285A 반도체 회로 부품 판매점
Diode Embedded White LED Driver
|
|
 Richtek Technology |
Preliminary
RT9285A/B
Tiny Package, High Performance, Diode Embedded White
LED Driver
General Description
Features
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 RSET, 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
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.
l VIN 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
LX
NC
PGND
1
2
3
4
8 FB
7 EN
6 VOUT
9 5 VDD
WDFN-8L 2x2
VDD VOUT EN
654
123
LX GND FB
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.
DS9w285A/Bw-02 Awugust 2. 007 D a t a S h e e t 4 U . c woww.ricmhtek.com
1
RT9285A/B
Preliminary
Typical Application Circuit
L1
10uH to 22uH
VIN
2.7V to 5.5V
Chip Enable
RT9285A/B
LX VDD
VOUT
EN
GND
FB
C1
1uF
C2
0.22uF to 1uF
RSET
12.5
Functional Pin Description
Pin No.
Pin Name
WDFN-8L
TSOT-23-6
Pin Function
1 -- AGND Analog Ground Pin.
LX Pin. Connect this Pin to an inductor. Minimize the track area to
2 1 LX
reduce EMI.
-- 2 GND Ground Pin.
3, Exposed Pad (9)
-- NC
No Internal Connection.
4 -- PGND Power Ground Pin.
Supply Input Voltage Pin. Bypass 1uF capacitor to GND to reduce the
5 6 VDD
input ripple.
Output Voltage pin. The pin internally connects to OVP diode to limit
6 5 VOUT
output voltage while LEDs are disconnected.
Chip Enable (Active High). Note that this pin has an internal pull-down
7 4 EN
resistance around 300kΩ.
Feedback Pin. Series connecting a resistor between WLED and
8
3 FB
ground as a current sense. Sense the current feedback voltage to set
the current rating.
Exposed pad should be soldered to PCB board and connected to
-- GND
GND.
www.richtek.com
2
DS9285A/B-02 August 2007
|
PDF 파일 내의 페이지 : 총 12 페이지
제조업체: Richtek Technology
( richtek )
RT9285A led
데이터시트 다운로드 :
[ RT9285A.PDF ]
[ RT9285A 다른 제조사 검색 ]
국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
[ 홈페이지 ]
IGBT, TR 모듈, SCR, 다이오드모듈, 각종 전력 휴즈
( IYXS, Powerex, Toshiba, Fuji, Bussmann, Eaton )
전력반도체 문의 : 010-3582-2743
관련 데이터시트
RT9285A
Diode Embedded White LED Driver - Richtek Technology
RT9285B
Diode Embedded White LED Driver - Richtek Technology
RT9285C
Diode Embedded White LED Driver - Richtek Technology