®
RT8525
Boost Controller with Dimming Control
General Description
The RT8525 is a wide input operating voltage range step
up controller. High voltage output and large output current
are feasible by using an external N-MOSFET. The RT8525
input operating range is from 4.5V to 29V.
The RT8525 is an optimized design for wide output voltage
range applications. The output voltage of the RT8525 can
be adjusted by the FB pin. The PWMI pin can be used as
a digital input, allowing WLED brightness control with a
logic-level PWM signal.
Features
VIN Range : 4.5V to 29V
Programmable Soft-Start Time
Programmable Boost SW Frequency from 50kHz to
600kHz
Output Over Voltage Protection
Output Under Voltage Protection
14-Lead SOP Package
RoHS Compliant and Halogen Free
Applications
LCD TV, Monitor Display Backlight
LED Driver Application
Ordering Information
RT8525
Package Type
S : SOP-14
Lead Plating System
G : Green (Halogen Free and Pb Free)
Pin Configurations
(TOP VIEW)
VDC
VIN
COMP
SS
FSW
AGND
PWMI
14
2
3
4
5
6
7
13
12
11
10
9
8
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.
DRV
PGND
EN
ISW
OOVP
FB
FAULT
Marking Information
RT8525GS : Product Number
SOP-14
RT8525
GSYMDNN
YMDNN : Date Code
Typical Application Circuit
V
IN
24V
C
IN
100µF
C
VIN
1µF
L1
33µH
RT8525
14
2 VIN
DRV
D1
1
VDC
C
DC
1µF
3 COMP
5 FSW
4 SS
ISW
R
SLP
11 2.4k
M1
C
OUT
100µF x 2
V
OUT
50V
R
C
33k
C
C1
27nF
C
C2
PGND
13
R
S
50m
R
SW
56k
C
SS
0.33µF
R
FLT
8 100k
FAULT
OOVP 10
AGND 6
FB 9
7
PWMI
R
FB1
117k
R
FB2
3k
PWMI
12V
C
OVP
R
OVP1
150k
R
OVP2
6k
Chip Enable
12 EN
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS8525-01 March 2012
www.richtek.com
1
RICHCO [ RICHCO, INC. ]
