RT9287 반도체 회로 부품 판매점
Boost Converter
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 Richtek Technology |
Preliminary
RT9287
Boost Converter for OLED Power with Dual LDO
General Description
The RT9287 integrates a boost converter for OLED power
and a Dual LDO for camera image sensor power. To achieve
high efficiency, the boost converter optimizes its operating
frequency for small LC filters value and reduces the
operating current. Moreover, the internal soft-start function
reduces the inrush current.
For the Dual LDO part, it possesses functions of 2%
accuracy, dual channel, low dropout voltage
(240mV@300mA), low noise, low ground current and
low dropout regulator sourcing up to 300mA at each
channel. For battery-powered devices, it provides near
zero shutdown current. Moreover, it also integrates
functions such as current limiting, over temperature, output
short circuit, 27μA low ground current per LDO and
short circuit thermal folded back protection. When output
short circuit occurs, the RT9287 reduces its over
temperature protection trip point to provide maximum
safety to users. The RT9287 is available in WDFN-10L
3x3 package.
Ordering Information
RT9287-
Package Type
QW : WDFN-10L 3x3 (W-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
LDO Output Voltage : VOUT1/VOUT2
MG : 2.80V/1.80V
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.
DS9w28w7-w01.DAautgauSsthe20e0t47 U.com
Features
z Boost Converter
`VIN Operating Range : 2.7V to 5.5V
`Maximum Output Voltage Up to 20V
`Output Current up to 100mA at VOUT = 12V.
`Low Shutdown Supply Current
`Minimize the External Component
`Small LC Filter
`Internal Soft Start
z Dual LDO
`Wide Operating Voltage Ranges : 2.7V to 5.5V
`Low-Noise for RF Application
`No Noise Bypass Capacitor Required
`Fast Response in Line/Load Transient
`TTL-Logic-Controlled Shutdown Input
`Low Temperature Coefficient
`Dual LDO Outputs (300mA/300mA)
`Ultra-low Quiescent Current 27μA/LDO
`High Output Accuracy 2%
`Short Circuit Protection
`Thermal Shutdown Protection
`Current Limit Protection
`Short Circuit Thermal Folded Back Protection
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Camera Phone
z OLED Power
Pin Configurations
(TOP VIEW)
VDD1 1
EN1 2
EN2 3
ENB 4
FB 5
GND
11
10 VLDO1
9 VLDO2
8 GND
7 VDD2
LX
WDFN-10L 3x3
www.richtek.com
1
RT9287
Preliminary
Typical Application Circuit
VIN +
2.7V to 5.5V
C1
1uF
VOUT
=
R1+ R2
R2
×
VFB
VFB = 1.235 (typ.)
R2 > 100kΩ
VIN
CIN
1uF
Chip Enable
L1
4.7uH to 22uH
D1
SS0520
RT9287
R1
910k
7 VDD2
4 ENB
LX 6
FB 5
R2
105k
VFB = 1.235V (typ.)
1 VDD1 VLDO1 10
COUT1
1uF
VOUT1
2 EN1
3 EN2
VLDO1 9
GND 8
COUT2
1uF
VOUT2
VOUT
12V
C2
1uF/16V
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
VDD1
LDO Power Input Voltage.
2
EN1
LDO Channel 1 Enable. (Active High).
3
EN2
LDO Channel 2 Enable. (Active High).
Boost Enable (Active High). Voltage sensing input to trigger the function of over
4
ENB
voltage protection. Note that this pin is high impedance. There should be a pull
low 100kΩ resistor connected to GND when the control signal is floating.
Boost Feedback Reference Voltage Pin. Series connect a resistor between
5 FB WLED and ground as a current sense. Sense the current feedback voltage to
set the current rating.
6
LX
Boost Switch Pin. Connect this Pin to inductor and catch diode. Minimize the
track area to reduce EMI.
7
VDD2
Boost Supply Input Voltage Pin. Bypass 1μF capacitor to GND to reduce the
input noise.
8
GND
GND pin should be soldered to PCB board and connected to GND.
9 VLDO2 LDO Channel 2 Output Voltage.
10 VLDO1
Exposed Pad (11) GND
LDO Channel 1 Output Voltage.
The exposed pad must be soldered to a large PCB and connected to GND for
maximum power dissipation.
www.richtek.com
2
DS9287-01 August 2007
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PDF 파일 내의 페이지 : 총 13 페이지
제조업체: Richtek Technology
( richtek )
RT9287 converter
데이터시트 다운로드 :
[ RT9287.PDF ]
[ RT9287 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
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