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RT4709

Triple DC-DC Converter with Auxiliary Buck Converter for AMOLED Displays

RT4709
New

The RT4709 is a multi-channel DC-DC converter designed to provide power for AMOLED displays. It integrates step-up and inverting DC-DC converters to supply the positive and negative output voltages required by AMOLED displays. Additionally, it includes a buck converter to power the display source driver IC.For portable applications, board space and efficiency are always major concerns. The high switching frequency of the RT4709 allows the use of low-inductance inductors, saving board space. The output voltages VO1, VO2, VO3, VO4 can be programmed by an external MCU through the ESWIRE and ASWIRE pins. The positive output voltage range for VO1 is 4.6V to 5.2V, for VO3 is 5V to 8V, and for VO4 is 0.8V to 1.5V. The negative output voltage range for VO2 is -1.4V to -10V. The RT4709 is available in a WL-CSP-42B 2.64x2.89 (BSC) package, optimizing the solution for PCB space. The recommended junction temperature range is -40°C to 125°C, and the ambient temperature range is -40°C to 85°C.

Applications

  • AMOLED Panels
  • Mobile Phones
  • Portable Instruments

Key Spec.

RT4709
Status Active
Vin (min) (V) 2.5
Vin (max) (V) 4.8
Number of Channels 4
Number of Buck Converters 1
Number of Boost Converters 2
Number of Negative Outputs 1
Number of LED Drivers 0
Number of LDO Regulators 0
Application OLED for Mobile
Features OCP;SCP
Package Type WL-CSP2.64x2.89-42(BSC)

Features

  • Supply Voltage Range: 2.5V to 4.8V

  • Boost Converter for Positive VO1 (ELVDD) Voltage: 4.6V to 5.2V

  • Inverting Converter for Negative VO2 (ELVSS) Voltage: -1.4V to -10V

  • Boost Converter for Positive VO3 (AVDD) Voltage: 5V to 8V

  • Buck Converter for Positive VO4 (DVDD) Voltage: 0.8V to 1.5V

  • Maximum Output Current up to 800mA for AMOLED Positive and Negative Power Supply (VO2 > -6V)

  • Maximum Output Current up to 150mA for AVDD Output Supply

  • Maximum Output Current up to 300mA for DVDD Output Supply

  • PWM Mode with 1.45MHz Switching Frequency

  • High Output Voltage Accuracy

  • Excellent Line and Load Transient Response

  • Excellent Line and Load Regulation

  • Programmable VO1 and VO2 Transition Time

  • Programmable Output Discharge/Hi-Z Function

  • Low Quiescent Current: < 1μA in Shutdown Mode

  • Protection Features: UVLO, OCP, SCP, OTP

  • 2.64x2.89-42B WCSP Package

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