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PDF AT1309 Data sheet ( Hoja de datos )
| Número de pieza | AT1309 | |
| Descripción | Micro-Power Step up DC-DC Converter | |
| Fabricantes | Aimtron Technology | |
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AT1309
Preliminary Product Information
Micro-Power Step up DC-DC Converter
Feature
•Operating Voltage:2.5V to 6.0V.
•High Operating Frequency: 1.4MHz
•High Output Voltage: Up to 28V
•Shutdown Current <1µA
•Digital Dimming Control.
•Built-in Cycle-by Cycle Current-Limiting.
•Built-in Soft-Start Function.
•±1.5% 1.23V Reference Voltage
•Tiny SOT-25 Package
Application
• STN/OLED Bias
• Personal Digital Assistants(PDAs)
• DSC
Description
The AT1309 step-up converter is designed for small
or medium size LCD panel of high bias voltage with
a constant current to provide PDAs, and other
hand-held devices. It features a fast 1.4 MHz
current-mode PWM control with a built-in 0.3Ω
N-MOS that allows for smaller capacitor and
inductor. Fault condition protection uses cycle-by
-cycle current limiting to sense maximum inductor
current and thermal protection. Also included
soft-start eliminates inrush current during start-up.
The AT1309 is available in 5-pin SOT-25 packages.
Block Diagram
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
3/2/2006 REV:1.1
Email: [email protected]
1
1 page  
Typical Characteristics
Efficiency vs. Load current
Vo=15V
L=10uH
AT1309
Preliminary Product Information
Micro-Power Step up DC-DC Converter
Efficiency vs. VIN
Vo=15V
L=10uH
Load current
Efficiency vs. Load current
Vo=15V
Vin=3.0V
VIN(V)
Quiescent current vs. VIN
TA=25OC
Load current
VIN (V)
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
3/2/2006 REV:1.1
Email: [email protected]
5
5 Page 
AT1309
Preliminary Product Information
Micro-Power Step up DC-DC Converter
Application Information
External components of boost converter can be designed by performing simple
calculations.
Boost inductor
Inductor selection depends on input voltage, output voltage, maximum output current,
switching frequency and availability of inductor values. The following boost circuit
equations are useful in choosing the inductor values based on the application. They
allow the trading of peak current and inductor value while allowing for consideration
of component availability and cost.
The peak inductor current is given by:
I Lpeak
=
I LAVG
+ ∆I L
2
I LAVG
= IO
1− D
where:
IL is the inductor peak-to-peak current ripple and is decided by:
∆I L
= Vin
L
×
D
f OSC
D is the MOSFET turn on ratio and is decided by:
D = VO −V in
VO
fOSC is the switching frequency.
The inductor should be chosen to be able to handle this current and inductor saturation
current rating should be greater than IPEAK.
Diode selection
The output diode has average current of IO, and peak current the same as the
inductor’s peak current and a voltage rating at least 1.5 times the output voltage.
Schottky diode is recommended and it should be able to handle those current.
Output Capacitor
The AT1308 is specially compensated to be stable with capacitors which have a worst-
case minimum value of 1uF at the particular VOUT being set. Output ripple voltage
requirements also determine the minimum value and type of capacitors. Output ripple
voltage consists of two components the voltage drop caused by the switching current
through the ESR of the output capacitor and the charging and discharging of the
output capacitor:
VRIPPLE
=
I LPEAK
× ESR + VO − Vin
VO
× IO
COUT ×
f OSC
For low ESR ceramic capacitors, the output ripple is dominated by the charging or
discharging of the output capacitor.
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
3/2/2006 REV:1.1
Email: [email protected]
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AT1309.PDF ] | |
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