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PDF RT9285A Data sheet ( Hoja de datos )
| Número de pieza | RT9285A | |
| Descripción | Diode Embedded White LED Driver | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT9285A (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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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
1 page  
Preliminary
RT9285A/B
Absolute Maximum Ratings (Note 1)
l Supply Voltage, VIN ------------------------------------------------------------------------------------------------- −0.3 to 6V
l LX Input Voltage ------------------------------------------------------------------------------------------------------ − 0.3V to 22V
l Output Voltage ------------------------------------------------------------------------------------------------------- − 0.3V to 21V
l The other pins -------------------------------------------------------------------------------------------------------- − 0.3V to 6V
l Power Dissipation, PD @ TA = 25°C
TSOT23-6 -------------------------------------------------------------------------------------------------------------- 0.455W
WDFN-8L 2x2 --------------------------------------------------------------------------------------------------------- 0.606W
l Package Thermal Resistance (Note 4)
TSOT23-6, θJA -------------------------------------------------------------------------------------------------------- 220°C/W
WDFN-8L 2x2, θJA --------------------------------------------------------------------------------------------------- 165°C/W
l Junction Temperature ----------------------------------------------------------------------------------------------- 150°C
l Lead Temperature (Soldering, 10 sec.)-------------------------------------------------------------------------- 260°C
l Storage Temperature Range --------------------------------------------------------------------------------------- − 65°C to 150°C
l ESD Susceptibility (Note 2)
HBM (Human Body Mode) ----------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------ 200V
Recommended Operating Conditions (Note 3)
l Operation Junction Temperature Range ------------------------------------------------------------------------- −40°C to 125°C
l Operation Ambient Temperature Range ------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VIN = 3.7V, FREQ left floating, TA = 25° C, unless otherwise specification)
Parameter
Symbol
Test Condition
System Supply Input
Operation voltage Range
Under Voltage Lock Out
Quiescent Current
Supply Current
V IN
VUVLO
IQ
IIN
FB = 1.5V, No switch
FB = 0V, Switch
Shut Down Current
Output
ISHDN
VEN < 0.4V
Line Regulation
Oscillator
VIN = 3V to 4.3V
Operation Frequency
fOSC
Maximum Duty Cycle
Reference Voltage
Feedback Reference Voltage VREF
Diode
Forward Voltage
VFW
IFW = 100mA
MOSFET
On Resistance of MOSFET
RDS(ON)
Min Typ Max Units
2.7 -- 5.5 V
1.7 2 2.3 V
-- 300 450 µA
-- -- 2 mA
-- 2 5 uA
-- -- 3 %
-- 1
-- MHz
85 90 -- %
0.237 0.25 0.263
V
-- 0.9 -- V
0.5 0.75
1
Ω
To be continued
DS9285A/B-02 August 2007
www.richtek.com
5
5 Page 
Outline Dimension
Preliminary
D
CB
H
L
b
A
e
A1
RT9285A/B
Symbol
A
A1
B
b
C
D
e
H
L
Dimensions In Millimeters
Min Max
0.700
1.000
0.000
0.100
1.397
1.803
0.300
0.559
2.591
3.000
2.692
3.099
0.838
1.041
0.080
0.254
0.300
0.610
Dimensions In Inches
Min Max
0.028
0.039
0.000
0.004
0.055
0.071
0.012
0.022
0.102
0.118
0.106
0.122
0.033
0.041
0.003
0.010
0.012
0.024
TSOT-23-6 Surface Mount Package
DS9285A/B-02 August 2007
www.richtek.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT9285A.PDF ] | |
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