AAT3134

High Efficiency 1x/1.5x Fractional Charge Pump for White LED Applications

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

The AAT3134 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 maximize efficiency for white LED applications. The device can be used to produce current levels up to 20mA in each of its six outputs to drive LEDs from a 2.7V to 5.5V input. Outputs may be operated individually or paralleled for driving higher-current LEDs. Low external parts counts (two 1µF flying capacitors and two small 1µF capacitors at V_IN and OUT) make the AAT3134 ideally suited for small battery-powered applications.

AnalogicTech's Simple Serial Control (S²Cwire™) interface is used to enable, disable, and set the LED drive current in two groups of four outputs and two outputs with multiple-level, independently-controlled brightness scales. The AAT3134 has a thermal management system to protect the device in the event of a short circuit condition at the output pin. Built-in soft-start circuitry prevents excessive inrush current during start-up. A high charge pump switching frequency enables the use of very small external capacitors. A low current shutdown feature disconnects the load from V_IN and reduces quiescent current to less than 1µA. The AAT3134 is available in a 16-pin quad QFN package.

Please note: AAT3134 is not recommended for new designs.

Data Sheets Receive a sample

Talk to Sales ECAD Model

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)1800

Peak Efficiency93%

Current Accuracy (%)±10%

Current Matching (%)±0.5%

Max. I_OUT per/Ch (mA)20

PackageQFN44, 16L

Package (mm)3 x 3 x 0.9

PackageQFN44-16

Features

V_IN range: 2.7V to 5.5V
< 1.0µA of shutdown
1 MHz switching frequency
Fully independent display lighting
Dual mode 1x and 1.5x charge pump for maximum efficiency
Drives low-V_F and high-V_F type LEDs
Up to six 20mA outputs
Multi-position brightness scale with digital control
Low noise constant frequency operation
Small application circuit
Regulated output current
Automatic soft-start
No inductors
16-pin QFN package
-40 to +85°C temperature range

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