RT8525 Datasheet, PDF (1/10 Pages) Richco, Inc. – Boost Controller with Dimming Control

®
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.
Ordering Information
RT8525
Package Type
S : SOP-14
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
Marking Information
RT8525
GSYMDNN
RT8525GS : Product Number
YMDNN : Date Code
Features
z VIN Range : 4.5V to 29V
z Programmable Soft-Start Time
z Programmable Boost SW Frequency from 50kHz to
600kHz
z Output Over Voltage Protection
z Output Under Voltage Protection
z 14-Lead SOP Package
z RoHS Compliant and Halogen Free
Applications
z LCD TV, Monitor Display Backlight
z LEDDriver Application
Pin Configurations
(TOP VIEW)
VDC
VIN
COMP
SS
FSW
AGND
PWMI
14
2
13
3
12
4
11
5
10
6
9
7
8
SOP-14
DRV
PGND
EN
ISW
OOVP
FB
FAULT
Typical Application Circuit
L1
V_IN
33µH
24V
C_IN
100µF
RT8525
2 _VIN
DRV ¹⁴
D1
M1
R_C
33k
C_C1
27nF
C_VIN
1µF
1
C_DC
VDC
R_SLP
ISW ^{11 2.4k}
1µF
R_S
C_C2
3 _{COMP PGND 13}
FB ⁹
50m
5 _FSW
PWMI ⁷
PWMI
R_FLT
R_SW
56k
4 _SS
C_SS
0.33µF
FAULT ^{8 100k} 12V
OOVP ¹⁰
R_OVP1
150k
Chip Enable ¹² EN
AGND ⁶
C_OVP
R_OVP2
6k
V_OUT
50V
C_OUT
100µF x 2
R_FB1
117k
R_FB2
3k
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8525-01 March 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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