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PDF RT8509A Data sheet ( Hoja de datos )
| Número de pieza | RT8509A | |
| Descripción | Step-Up DC/DC Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8509A (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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®
RT8509A
4.5A Step-Up DC/DC Converter
General Description
The RT8509A is a high performance switching Boost
converter that provides a regulated supply voltage for active
matrix thin film transistor (TFT) liquid crystal displays
(LCDs).
The RT8509A incorporates current mode, fixed-frequency,
pulse width modulation (PWM) circuitry with a built in
N-MOSFET to achieve high efficiency and fast transient
response.
The RT8509A has a wide input voltage range from 2.8V to
14V. In addition, the output voltage can be adjusted up to
24V via an external resistive voltage divider. The maximum
peak current is limited to 4.5A (min.). Other features
include adjustable soft-start, over-voltage protection, and
over-temperature protection.
The RT8509A is available in the WDFN-12L 5x5 package.
Marking Information
RT8509A
GQW
YMDNN
RT8509AGQW : Product Number
YMDNN : Date Code
Features
90% Efficiency
Adjustable Output Up to 24V
2.8V to 14V Input Supply Voltage
Input Supply Under-Voltage Lockout
Fixed 1.2MHz Switching Frequency
Adjustable Soft-Start
VOUT Over-Voltage Protection
Over-Temperature Protection
Thin 12-Lead WDFN Package
RoHS Compliant and Halogen Free
Applications
GIP TFT-LCD Panels
Ordering Information
RT8509A
Package Type
QW : WDFN-12L 5x5 (W-Type)
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.
Simplified Application Circuit
L1 D1
VIN
VOUT
CIN R4
LX
VIN VOUT
C2
RT8509A
FB
R1
C3
R2
COUT
Enable
EN
GND
SS
COMP
R3
CSS
C1
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8509A-00 November 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT8509A
Parameter
Transconductance
Voltage Gain
Symbol
gm
AV
Test Conditions
I = ±2.5μA at VCOMP = 1V
FB to COMP
Min Typ Max Unit
-- 100 -- A/V
-- 700 -- V/V
N-MOSFET
Current Limit
On-Resistance
Leakage Current
Current Sense
Transresistance
Soft-Start
Charge Current
Control Inputs
EN Input
Voltage
Logic-High
Logic-Low
ILIM
RDS(ON)
ILEAK
RCS
VLX = 24V
VIH
VIL
4.5 5
-- A
-- 100 250 m
-- 30 45 A
-- 0.25 -- V/A
-- 5 -- A
1.5
--
--
--
--
0.5
V
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may
affect device reliability.
Note 2. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is
measured at the exposed pad of the package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8509A-00 November 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
RT8509A
The compensation circuit should be kept away from the power loops and
should be shielded with a ground trace to prevent any noise coupling.
Locate the C2 as close to
the VIN pin as possible.
GND
VIN
GND
C1
R3
COMP 1
12 SS
C2
FB 2
11 VIN
R1
VOUT
EN 3
GND 4
R2 GND 5
GND 6
13
GND
10 VOUT
9 GND
8 LX
7 LX
The feedback voltage-divider
resistors must near the feedback
pin. The divider center trace
must be shorter and avoid the
trace near any switching nodes.
L1
VIN
More GND via and layout area for
better thermal performance.
The switching trace should be wide and
short especially for the high-current loop.
Place the power components
as close as possible. The
R4 traces should be wide and
short especially for the high-
current loop.
D1
CIN
VOUT
COUT
GND
VIN
Figure 3. PCB Layout Guide
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8509A-00 November 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT8509A.PDF ] | |
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