LED Driver. RT9285B Datasheet


RT9285B Driver. Datasheet pdf. Equivalent


Part Number

RT9285B

Description

Diode Embedded White LED Driver

Manufacture

Richtek

Total Page 13 Pages
Datasheet
Download RT9285B Datasheet


RT9285B
®
RT9285B
Tiny Package, High Performance, Diode Embedded White
LED Driver
General Description
Features
The RT9285B 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 250mV. 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
RT9285B
Package Type
QW : WDFN-8L 2x2 (W-Type)
J6 : TSOT-23-6
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Note :
Richtek 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.
VIN Operating Range : 2.7V to 5.5V
Up to 85% Efficiency
22V Internal Power N-MOSFET
1MHz Switching Frequency
Built-in Diode
Digital Dimming with Zero-Inrush
Input UVLO Protection
Output Over Voltage Protection
Internal Soft Start and Compensation
TSOT-23-6 and 8-Lead WDFN Package
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Cellular Phones
Digital Cameras
PDAs and Smart Phones
Porbable Instruments
MP3 Player
OLED Power
Pin Configuration
(TOP VIEW)
VDD VOUT EN
AGND
LX
NC
PGND
1
2
3
4
8 FB
7 EN
6 VOUT
9 5 VDD
654
23
LX GND FB
WDFN-8L 2x2
TSOT-23-6
Simplified Application Circuit
L1
Chip Enable
RT9285B
LX VDD
VOUT
EN
GND
FB
VIN
C1
C2
RSET
Copyright ©2017 Richtek Technology Corporation. All rights reserved.
DS9285B-07 September 2017
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT9285B
RT9285B
Marking Information
RT9285BGQW
J9 : Product Code
J9W
W : Date Code
RT9285BGJ6
AN=DNN
AN= : Product Code
DNN : Date Code
Functional Pin Description
Pin No.
Pin Name
WDFN-8L
TSOT-23-6
Pin Function
1 -- AGND Analog ground.
2
1 LX
LX pin. Connect this pin to an inductor. Minimize the track area to
reduce EMI.
--
2 GND
Ground.
3, 9 (Exposed Pad) -- NC
No internal connection. Exposed pad should be soldered to PCB
board and connected to GND.
4 -- PGND Power ground.
5
6 VDD
Supply input voltage. Bypass 1F capacitor to GND to reduce the
input ripple.
6
5
VOUT
Output voltage. The pin internally connects to OVP diode to limit
output voltage while LEDs are disconnected.
7
4 EN
Chip enable (active high). Note that this pin has an internal
pull-down resistance around 300k.
Feedback. Series connecting a resistor between WLED and ground
8
3 FB
as a current sense. Sense the current feedback voltage to set the
current rating.
Copyright ©2017 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9285B-07 September 2017


Features ® RT9285B Tiny Package, High Performan ce, Diode Embedded White LED Driver Ge neral Description Features The RT9285 B is a high frequency asynchronous boos t converter with internal diode, which can support 2 to 5 White LEDs for backl ighting and OLED power supply. The Inte rnal soft start function can reduce the inrush current. The device operates wi th 1MHz fixed switching frequency to al low small external components and to si mplify possible EMI problems. The devic e comes with 20V over voltage protectio n to allow inexpensive and small-output capacitors with lower voltage rating. The LED current is initially set with t he external sense resistor RSET, and th e feedback voltage is 250mV. Tiny packa ge type TSOT-23-6 and WDFN-8L 2x2 packa ges provide the best solution for PCB s pace saving and total BOM cost. Orderi ng Information RT9285B Package Type Q W : WDFN-8L 2x2 (W-Type) J6 : TSOT-23-6 Lead Plating System P : Pb Free G : G reen (Halogen Free and Pb Free) Note : Richtek products are : .
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