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High Efficiency 1X/1.5X/2X Charge Pump: AAT3141
from Analogic Tech
The AAT3141 is a low noise, constant frequency charge pump DC/DC converter that uses a trimode load switch (1X), fractional (1.5X), and doubling (2X) conversion to maximize efficiency for White LED applications. The device produces cur-rent levels up to 30mA on each of its 4 current source outputs to drive various arrangements of LEDs from a 2.7V to 5.5V input. Outputs may be operated individually or in parallel for driving higher-current LEDs. A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at VIN , and CP) make the AAT3141 ideally suited for small battery-powere applications.
Analogic Tech's Advanced Simple Serial Control® (AS 2 Cwire®) digital input is used to enable, disable and set the LED drive current with a 32 level logarithmic scale LED brightness control. The AAT3141 has a thermal management system to protect the device in the event of a short circuit condition at an 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. In shutdown mode, the device disconnects the load from VIN and reduces quiescent current to less than 1µA. The AAT3141 is available in the very small 12 pin TSOPJW package.
Features:
- Tri Mode 1x, 1.5x, and 2x Charge Pump for Maximum Efficiency and VF coverage
- Drives Low-VF & High-VF Type LEDs
- Up to 4, 30mA Outputs
- AS 2 Cwire Independent 3+1 output addressing
- 32 Position Logarithmic Scale with Digital Control
- Low Noise Constant Frequency Operation
- 1MHz Switching Frequency
- Small Application Circuit
- Regulated Output Current
- Automatic Soft-Start
- No Inductors
- Iq < 1µA in Shutdown
- 12 pin TSOPJW package Applications
- White LED Backlighting
- White Photo-Flash for DSCs
- Color (RGB) Lighting
- Programmable Current Sources
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