AAT3141
High Efficiency 1X/1.5X/2X Charge Pump
for White LED Applications
cost Y5V and Z5U dielectrics, but capacitors greater
rises above the thermal limit as is the case during a
short circuit of the CP pin.
than 1µF are typically not required for AAT3141
applications.
Capacitor area is another contributor to ESR.
Capacitors that are physically large will have a lower
ESR when compared to an equivalent material
smaller capacitor. These larger devices can improve
circuit transient response when compared to an
equal value capacitor in a smaller package size.
Charge Pump Compatibility
The 4-output AAT3141 is pin-compatible with the
AAT3123, AAT3132, and AAT3113 in TSOPJW-12
packages. The AAT3141 offers an improved overall
efficiency, wider operating range, and the ability to
drive high-VF type LEDs at full current. The AAT3141
is well suited for battery powered applications using
single-cell lithium-ion (Li-Ion) batteries (4.2V to
2.8V), lithium polymer batteries, and 3-series con-
nected dry cells (3.6V).
Thermal Protection
The AAT3141 has a thermal protection circuit that will
shut down the charge pump if the die temperature
3141.2004.07.0.91
15
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
