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PDF AT1731A Data sheet ( Hoja de datos )
| Número de pieza | AT1731A | |
| Descripción | DC-DC Power IC | |
| Fabricantes | Aimtron Technology | |
| Logotipo |  |
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AT1731A
Preliminary Product Information
DC-DC Power IC for TFT Panel
Feature
• 2.6V to 5.5V Supply Voltage Operating Range.
• 1.2MHz Fixed Switching Frequency.
• Current-Mode PWM Step-Up Regulator
Main High-Power Output up to 15V
Typical ± 1% Accuracy
Built-In N-MOS, Rds(on)≒0.25Ω(Typ.)
Current-Limit Comparator
• Negative Charge-Pump Output Voltage Down
to –30 V.
• Positive Charge-Pump Output Voltage Up to
30 V.
• Internal Power-On Sequencing , Soft-Start.
• Thermal Protection , Short Circuit Protection.
• 1uA Shutdown Current.
• 1.5mA Quiescent Current.
• 16-pin TSSOP Package.
Application
• TFT-LCD Notebook Display
• TFT-LCD Desktop Monitor Panels.
• Car Navigation Systems.
Description
The AT1731A DC-DC converter supply a compact
and small power supply solution to provide the
regulated voltages required by thin film transistor
(TFT) LCD display. A built-in power sequence
control.
The main step-up DC-DC converter is a
high-Frequency 1.2 MHz current-mode PWM
regulator with a built-in 0.25ΩN-MOS that allows the
use of ultra-small inductors and ceramic capacitor to
generate an externally set output voltage up to 15V. It
provides fast transient response to pulsed loads while
operating with efficiencies over 85%.
The two built-in charge-pump regulators are used to
generate the TFT gate-on and gate-off supplies and
can adjust gate-on and gate-off output voltage with
external resistive divider between gate-off/on output
voltage and ground.
AT1731A is available in TSSOP- 16 package.
Block Diagram
/SHDN
REF
SCP GND
Vin
VDDN Negative
SWN Charge-Pump
FBN Block
Reference
Voltage
Soft- Under-Voltage
Start Lockout
Short-Circuit
Protection
Thermal
Protection
Logic Control Block
VDDP Positive
SWP Charge-Pump
FBP Block
Main Step-Up
Converter Block
LX
PGND
FB
COMP
SS
Aimtron reserves the right without notice to change this circuitry and specifications.
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878 Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
Email: [email protected]
1
1 page  
AT1731A
Preliminary Product Information
DC-DC Power IC for TFT Panel
N-ch On-Resistance
Maximum RMS SWP Current
Reference
Reference Voltage
Reference Under-voltage
Threshold
Logic Signals
SHDN input low voltage
SHDN input high voltage
SHDN input current
Thermal Shutdown
ON)
RNCH-DS( VFBP=1.2V
ON) VFBP=1.24V
VREF
-2uA <IREF <50uA
ISHDN
0.4V hysteresis
2
20
30
4Ω
KΩ
mA
1.21 1.23 1.24
0.9 1.06 1.16
V
V
0.9
2.1
0.01 1
160
V
V
uA
℃
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878 Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
Email: [email protected]
5
5 Page 
Typical Application Circuit
AT1731A
Preliminary Product Information
DC-DC Power IC for TFT Panel
Figure 1. Standard Application Circuit
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878 Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
Email: [email protected]
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet AT1731A.PDF ] | |
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