DATA SHEET
AAT3122
High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications
General Description
Features
The AAT3122 is a low noise, constant frequency charge
pump DC/DC converter that uses a dual mode load
switch (1X) and fractional (1.5X) conversion to increase
efficiency in white LED applications. With input voltages
ranging from 2.7V to 5.5V, the device can produce an
output current of up to 120mA. A low external parts
count (two 1µF flying capacitors and two small bypass
capacitors at VIN and OUT) makes the AAT3122 ideally
suited for small battery-powered applications.
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Skyworks' Simple Serial Control™ (S2Cwire™) interface
is used to enable, disable, and set the LED drive current
with a 32-level logarithmic scale LED brightness control.
The AAT3122 has a thermal management system to protect the device in the event of a short-circuit condition
on any of the output pins. Built-in soft-start circuitry
prevents excessive inrush current during start-up. High
switching frequency enables the use of small external
capacitors. A low shutdown current feature disconnects
the load from VIN and reduces quiescent current to less
than 1µA. The AAT3122 provides a single current source
output that can be used to drive up to six LEDs at 20mA
each. The AAT3122 is available in a Pb-free TSOPJW-12
package.
VIN Range: 2.7V to 5.5V
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