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Aimtron Technology
Aimtron Technology

AT1731A Datasheet Preview

AT1731A Datasheet

DC-DC Power IC

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AT1731A pdf
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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: service@aimtron.com.tw
1



Aimtron Technology
Aimtron Technology

AT1731A Datasheet Preview

AT1731A Datasheet

DC-DC Power IC

No Preview Available !

AT1731A pdf
Pin Configurations
AT1731A
Preliminary Product Information
DC-DC Power IC for TFT Panel
VDDP
VDDN
LX
Vin
COMP
FB
SHDN
REF
1
2
3
4
5
6
7
8
16 PGND
15 SWP
14 SWN
13 FBN
12 SCP
11 FBP
10 SS
9 GND
Ordering Information
Part Number
AT1731AP
AT1731AP_GRE
Package
TSSOP-16
TSSOP-16 , Green
Marking
Date Code
, Date code with one bottom line
: Date Code
*For more marking information, contact our sales representative directly
Pin Description
Pin N0.
Symbol I / O
1 VDDP P
2 VDDN P
3 LX
I
4 Vin
P
5 COMP O
6 FB
I
7 /SHDN I
8 REF
9 GND
10 SS
O
P
I
11 FBP
I
12 SCP
13 FBN
I
I
14 SWN
O
15 SWP
O
16 PGND P
Description
Positive Charge-Pump Driver Supply Voltage. Bypass to power ground
with 0.1uF capacitor.
Negative Charge-Pump Driver Supply Voltage. Bypass to power
ground with 0.1uF capacitor.
Main Step-up Regulator N-MOS Drain. Place output diode and
inductor.
Input voltage pin of the device .Vin may range from 2.6V to 5.5V
Compensation pin for the main step-up converter. A series RC is
connected to this pin.
Main Step-Up Regulator Feedback Input. Connect a resistive divider
from main output to FB to analog ground.
Active-low shutdown control input. Pull SHDN low to force the
controller into shutdown. If unused, connect SHDN to Vin for normal
operation.
Internal Reference Output. External load capability up to 50uA.
Analog Ground.
Soft-start input. The capacitor connected to this pin to sets the
current-limited start time.
Positive Charge-Pump Regulator Feedback Input. Connect a resistive
divider from the positive charge-pump output to FBP to analog
ground.
Short Circuit Protection.
Negative Charge-Pump Regulator Feedback Input. Connect a resistive
divider from the negative charge-pump output to FBN to the reference.
Negative Charge-Pump Driver Output. Output high level is VDDN and
low level is PGND.
Positive Charge-Pump Driver Output. Output high level is VDDP and
low level is PGND.
Power Ground.
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: service@aimtron.com.tw
2


Part Number AT1731A
Description DC-DC Power IC
Maker Aimtron Technology
Total Page 22 Pages
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