AAT3114

High Efficiency 1.5x Fractional Charge Pump for White LED Applications

Please note: this product is being discontinued and is not recommended for new designs.

The AAT3113/4 are low noise, constant frequency charge pump DC/DC converters that use fractional (1.5X) conversion to increase efficiency in white LED applications. The devices can be used to produce current levels up to 20mA for each output from a 2.7V to 5.5V input. Low external parts counts (two 1µF flying capacitors and two small bypass capacitors at V_IN and OUT) make the AAT3113/4 ideally suited for small battery-power applications.

AnalogicTech’s Simple Serial Control™ (S²Cwire™) interface is used to enable, disable, and set the LED drive current for a 32-level logarithmic scale LED brightness control. The AAT3113/4 have 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-current shutdown feature disconnects the load from V_IN and reduces quiescent current to less than 1µA. The AAT3113 provides four LED current source outputs, and the AAT3114 provides six.

The AAT3113/4 are available in 16-pin quad QFN packages; the AAT3113 is also available in a 12-pin TSOPJW package.

Please note: AAT3114 is not recommended for new designs.

Data Sheets Receive a sample

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Specifications

Number of LEDs6

LED Channels6

LED(s) per/Ch1

Min. V_IN (V)2.7

Max. V_IN (V)5.5

InterfaceS²Cwire™

Typ. I_Q (μA)1000

Peak Efficiency93%

Current Accuracy (%)±10%

Current Matching (%)±0.3%

Max. I_OUT per/Ch (mA)20

PackageTSOPJW, 12L

Package (mm)3 x 2.85 x 1.02

PackageQFN44-16

Features

AAT3113 – Four (4) outputs
AAT3114 – Six (6) outputs
20mA full-scale current
Simple Serial Control™ (S²Cwire™) interface
32-position logarithmic scale with digital control
Low noise constant frequency operation
33% less input current than Doubler Charge Pump
High accuracy brightness matching
Small application circuit
Regulated output current
Automatic soft-start
V_IN Range: 2.7V to 5.5V
No inductors
600kHz switching frequency
I_Q < 1µA in shutdown
Temperature range: -40 to +85C
16-pin QFN, 12-pin TSOPJW package

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