AAT3113

Features:

White LED Backlighting
AAT3113 - 4 Outputs
AAT3114 - 6 Outputs
20mAFull Scale Current
32 Position Logarithmic Scale with DigitalControl
Simple Serial Control? (S² Cwire™) interface
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
VIN Range: 2.7V to 5.5V
No Inductors
600kHz Switching Frequency
Iq < 1Ain Shutdow
Temperature Range -40 to 85°C
16-Pin QFN, 12-Pin TSOPJW Package

Application

White LED Backlighting
Programmable Current Source




Pinout






Specifications

Symbol	Description	Value	Units
VIN	Input Voltage	-0.3 to 6	V
VOUT	Charge Pump Output	-0.3 to 6	V
VEN/SET	EN/SETto GND Voltage	-0.3 to 6	V
VEN/SET(MAX)	Maximum EN/SETto Input Voltage	0.3	V
IOUT	Maximum DC Output Current (Sum of Iout and D currents)	150	mA
JA	Thermal Resistance	37	°C/W
TJ	Operating Junction Temperature Range	-40 to 150	°C

Description

span id="lblDescription">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 1F flying capacitors and two small bypass capacitors at V_IN and OUT) make the AAT3113/4 ideally suited for small battery-power applications. AnalogicTech 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 1A. 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