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LCD screen power supply

AS9701

Dual Channel Output LCD Bias Power for Smart-phones And Tablets

General Description
   
    The AS9701 is a high integrated PMU which is designed to support positive/negative driven TFT-LCD panels up to 10” at least (from SFF to MFF like tablets). The two output rails are usually connected to the Source Driver IC. The device uses a single inductor scheme in order to provide the user the smallest solution size possible as well as high efficiency.
    It features a highly integrated step-up DC-DC converter with wide input voltage range from 2.7V to 5.5V. It is optimized for products powered by single-cell batteries (Li-Ion,Ni-Li,Li-Polymer) and symmetrical output currents up to 150mA at least. An LDO and switched capacitor generate dual outputs at +5.4V (default) and -5.4V (default). Optimized step-up, LDO and switched capacitor converters maximize conversion efficiency, exceeding 85% (IOUT>10mA).
    AS9701 integrates all compensation and soft-start circuitry, which results in a simpler and smaller solution with much fewer external components. High switching frequency 1.4MHz allows the use of a smaller inductor and capacitor to further reduce the solution size.
    The I2C compatible interface allows to control the positive and negative outputs from +4.0V to +6.5V and -4.0V to -6.5V, respectively, as well as programming additional registers on the device.The I2C address of AS9701 is 3Eh, only when the master device initiates the correct address, AS9701 generates an acknowledge condition and works normal.
    The device is a RoHs and Green compliant 1.17mm x 1.97mm 15-Ball WLCSP (0.4mm ball pitch) package.

Features

●  High Efficiency above 85% IOUT>10mA
●  Input Voltage Range: 2.7V to 5.5V
●  Dual Output Regulator with Single Inductor
●  Programmable Output Voltage Voltages
●  Positive Output Voltage Range:+4.0V to +6.5V (100mV/Step)Driving Capability Up to 200mA
●  Negative Output Voltage Range:-4.0V to -6.5V (100mV/Step)Driving Capability Up to 150mA
●  ±1.5% Output Voltage Accuracy
●  Excellent Line Regulation
●  Switched Capacitor with PFM mode at Light Load
●  Advanced Power-Save Mode for Light Load
●  Programmable Active Discharge
●  Support I2C Compatible Interface
●  Integrated Compensation and Feedback Circuits
●  1uA Shut-Down Supply Current
●  Boost Current Mode Operation
●  Cycle-by-Cycle Current Limit
●  Internal Soft-Start Prevents Inrush Current
●  Under Voltage Lock Out

●  Over-Temperature Protection
●  1.4MHz Fixed Switching Frequency
●  Proprietary Switching Loss Reduction Technology
●  Small Solution Size
●  RoHS and Green Compliant
●  Space Saving 15-ball WLCSP (1.17mm x1.97mm) Packages
●  -40℃ to +85 ℃ Temperature Range

Applications

●  TFT LCD Smart-phones
●  TFT LCD Tablets
●  White Brand MID
●  OLED Display

●  DAC Supply
●  General Dual Power Supply Application

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