AAT3113 datasheet(12/15 Pages) AAT

12 / 15 page

AAT3113, AAT3114/14A

High Efficiency 1.5X Fractional Charge

Pumps For White LED Applications

3113.2006.07.1.9

Application Circuits

Typical AAT3113 Application Circuit:

CIN

μF

VBATTERY

COUT

μF

EN/SET

μF

VIN

OUT

C1+

C1-

C2+

C2-

EN/SET

GND

AAT3113

ON/1

THI > 50ns

50ns minimum to enable

300ns < TLO < 75

μs

23456

(n < =32)

OFF

Enable / Disable / LED Brightness Level Set Data Input

Test Current/Channel Disable

Each channel of the output is equipped with a test

current function. The AAT3113 and AAT3114 use a

small (~2µA) current source injected into each out-

put pin to detect the presence of an LED. Unused

channels that are tied to ground or LED load fail

short will be automatically diasbled instead of wast-

ing the programmed output current. The test current

in the AAT3114A is higher (~150µA) to accommo-

date LEDs with lower impedance in failure mode.

Thermal Protection

The AAT3113 and AAT3114/14A have a thermal

protection circuit that will shut down the charge

pump and current outputs if the die temperature

rises above the thermal limit. However, thermal

resistance of the QFN package is so low that if, in

the case of the AAT3114/14A, all six outputs are

shorted to ground at maximum 20mA output level,

the die temperature will not rise sufficiently to trip

the thermal protection. The thermal protection will

only trip if COUT is shorted to ground and the ambi-

ent temperature is high.

AAT3113 Datasheet(PDF) 12 Page - Advanced Analog Technology, Inc.

AAT3113 Datasheet(HTML) 12 Page - Advanced Analog Technology, Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Datasheet Download

Link URL