AAT3114AISN-20-T1 AAT [Advanced Analog Technology, Inc.], AAT3114AISN-20-T1 Datasheet - Page 12

• Manufacturer Part Number: AAT3114AISN-20-T1
• Description: High Efficiency 1.5X Fractional Charge Pumps For White LED Applications
• Manufacturer: AAT [Advanced Analog Technology, Inc.]

Application Circuits
Typical AAT3113 Application Circuit:
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.
12
Enable / Disable / LED Brightness Level Set Data Input
V
BATTERY
ON/1
T
2
HI
> 50ns
3
C
1μF
IN
4
C
1μF
EN/SET
OUT
5
6
300ns < T
High Efficiency 1.5X Fractional Charge
VIN
OUT
EN/SET
AAT3113
Pumps For White LED Applications
GND
LO
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 C
ent temperature is high.
< 75μs
C1+
C2+
C1-
C2-
D1
D2
D3
D4
OUT
D4
(n < =32)
C1
1μF
C2
1μF
is shorted to ground and the ambi-
n
D3
50ns minimum to enable
D2
OFF
D1
3113.2006.07.1.9