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  Richtek Technology Electronic Components Datasheet  

RT8525 Datasheet

Boost Controller

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®
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
69
78
SOP-14
DRV
PGND
EN
ISW
OOVP
FB
FAULT
Typical Application Circuit
L1
VIN 33µH
24V
CIN
100µF
2
RT8525
VIN DRV
14
D1
M1
R33Ck
2C7Cn1F
CVIN
1µF
1
CDC
VDC
ISW 11 R2S.4LkP
CC2
R56SkW
1µF
3 COMP PGND 13
5 FSW
CSS 4 SS
0.33µF
FB
PWMI
9
7
RFLT
FAULT 8 100k
OOVP 10
R50Sm
PWMI
12V
ROVP1
150k
Chip Enable 12 EN
AGND 6
COVP
ROVP2
6k
VOUT
COUT 50V
100µF x 2
RFB1
117k
RFB2
3k
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8525-01 March 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8525 Datasheet

Boost Controller

No Preview Available !

RT8525
Functional Pin Description
Pin No.
1
Pin Name
Pin Function
VDC
Output of Internal Pre-Regulator.
2 VIN
3 COMP
IC Power Supply.
Compensation for Error Amplifier. Connect a compensation network to ground.
4 SS
5 FSW
6 AGND
7 PWMI
External Capacitor to Adjust Soft-Start Time.
Frequency Adjust Pin. This pin allows setting the switching frequency with a resistor
from 50kHz to 600kHz.
Analog Ground.
External Digital Input for Dimming Function.
8 FAULT
9 FB
Open Drain Output for Fault Detection.
Feedback to Error Amplifier Input.
10 OOVP
11 ISW
12 EN
Sense Output Voltage for Over Voltage Protection and Under Voltage Protection.
External MOSFET Switch Current Sense Pin. Connect the current sense resistor
between the external N-MOSFET switch and ground.
Chip Enable (Active High).
13 PGND
14 DRV
Power Ground of Boost Controller.
Drive Output for the N-MOSFET.
Function Block Diagram
FSW
VIN
VDC
FAULT
UVLO OTP
12V LDO
FAULT
Protection
OSC
EN
PWMI
PGND
AGND
PWM
Controller
OOVP/OUVP
Logic
+ 0.1V
-
+
- 2.5V
SQ
RQ
OC+
- 0.4V
VOS
+
-
-
Blanking
EA+ 1.25V
-
4µA
OOVP
DRV
ISW
FB
COMP
SS
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8525-01 March 2012


Part Number RT8525
Description Boost Controller
Maker Richtek
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RT8525 Datasheet PDF






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