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PDF RT8509 Data sheet ( Hoja de datos )
| Número de pieza | RT8509 | |
| Descripción | Step-Up DC/DC Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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®
RT8509
3A, 14V Step-Up DC/DC Converter
General Description
The RT8509 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 RT8509 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 RT8509 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 (typ.). Other features include
programmable soft-start, over voltage protection, and over
temperature protection.
The RT8509 is available in a WDFN-10L 3x3 package.
Ordering Information
RT8509
Package Type
QW : WDFN-10L 3x3 (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.
Features
z 90% Efficiency
z Adjustable Output Up to 24V
z 2.8V to 14V Input Supply Voltage
z Input Supply Under Voltage Lockout
z Fixed 1.2MHz Switching Frequency
z Programmable Soft-Start
z VOUT Over Voltage Protection
z Over Temperature Protection
z Thin 10-Lead WDFN Package
z RoHS Compliant and Halogen Free
Applications
z GIP TFT LCD Panels
Pin Configurations
(TOP VIEW)
COMP 1
FB 2
EN 3
GND 4
GND 5
10 SS
9 VIN
8 VSUP
7 LX
11 6 LX
WDFN-10L 3x3
Marking Information
H4=YM
DNN
H4= : Product Code
YMDNN : Date Code
Typical Application Circuit
VIN
12V CIN
10µF x 2 R4
10
L1
4.7µH
D1
6, 7
LX VSUP 8
Chip Enable
C2 9 VIN RT8509
1µF
3 EN
FB 2
SS 10
4, 5, 11 (Exposed Pad) GND
COMP 1
C3
1µF
R3
56k
R1
134k
VOUT
COUT 18V
4.7µF x 3
R2
10k
CSS
33nF
C1
1nF
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8509-01 March 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
Typical Operating Characteristics
Boost Efficiency vs. Load Current
100
VIN = 5V
90
VIN = 3.3V
80
70
60
50
0
VOUT = 13.5V, fOSC = 1.2MHz
0.1 0.2 0.3
Load Current (A)
0.4
0.5
Boost Reference Voltage vs. Temperature
1.5
1.4
1.3
1.2
1.1
1
-50
-25
VIN = 3.3V
0 25 50 75
Temperature (°C)
100 125
Boost Reference Voltage vs. Input Voltage
1.5
1.4
1.3
1.2
1.1
1
2 4 6 8 10 12 14
Input Voltage (V)
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8509-01 March 2012
RT8509
Boost Efficiency vs. Load Current
100
90
VIN = 14V
VIN = 12V
VIN = 10V
80
70
60
50
0
VOUT = 18V, fOSC = 1.2MHz
0.3 0.6 0.9
Load Current (A)
1.2
1.5
Boost Frequency vs. Temperature
1400
1300
1200
1100
1000
900
-50
-25
VIN = 3.3V
0 25 50 75
Temperature (°C)
100 125
Boost Current Limit vs. Input Voltage
7
6
5
4
3
2
2 4 6 8 10 12 14
Input Voltage (V)
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet RT8509.PDF ] | |
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