General Description
The AAT2847 is a highly integrated power solution for single cell Li-Ion/Polymer based liquid crystal display (LCD) display applications. It includes a four channel light emitting diode (LED) backlight driver and two integrated 200mA low dropout voltage regulators (LDOs) as additional power supplies for display and camera related chipsets.
The backlight driver in the AAT2847 is a low noise tri-mode DC/DC charge pump converter. Each of the four channels of the backlight driver is capable of delivering up to 20mA of bias currents for white LEDs. The white LED (WLED) backlight bias current matching is 1% which helps provide uniform display brightness.
AnalogicTech’s AS2Cwire™ (Advanced Simple Serial Control™) serial digital interface is used to enable, disable, and set the current for each backlight LED channel. Each LED channel has sixteen available current level settings in three separate current scales, plus four available current level settings on a low level current scale.
Each LED channel is equipped with built-in short circuit protection and auto disable functionality. A low shutdown current feature disconnects the load from the input and reduces quiescent current to less than 1μA.
The AAT2847 is available in the thermally enhanced 20-pin 3x4x0.75mm TQFN package.
Features
• Input Supply Voltage Range: 2.7V to 5.5V
• Tri-Mode (1X/1.5X/2X) Charge Pump:
- Delivers up to 120mA of Output Current
• Integrated LCD Display Solution:
- Four-Channel WLED Backlight
• User-Programmable WLED Current Scales: 30mA, 20mA and 15mA.
- Sixteen Programmable Current Level Settings
• User Selectable Low Level Current Scale
- Four Programmable Current Level Settings
- Dual 200mA LDOs (w/Separate Enables)
• Single-Wire AS2Cwire Serial Interface for Configuration/Control
- Four Addressable Registers
- Fast, 1MHz Serial Interface
• > 90% Peak Efficiency
• LDO Output Voltages:
- AAT2847-EE: User-Programmable
- AAT2847-QG: 2.8V and 1.5V
- AAT2847-QI: 2.8V and 1.8V
• Over-Temperature Protection
• Available in 3x4x0.75mm TQFN34-20 Package
• -40°C to +85°C Temperature Range
Applications
• Camera Function Power Supplies
• Camera Phone Displays
• LCD Modules
• White LED Backlighting
AAT2847IML-EE-T1
AAT2847IML-QG-T1
