GENERAL DEscriptION

The SGM3851A is designed for powering AMOLED displays which require VAVDD, VELVDD and VELVSS. The device integrates two boost converters, VO1 for VELVDD and VO3 for VAVDD, and an inverting buck-boost converter VO2 for VELVSS. Output voltages of all the three converters can be programmed in digital steps through the digital interface control pin (CTRL).

The SGM3851A is available in a Green TQFN-3×3-16L package. It operates over an ambient temperature range of -40℃ to +85℃.

FEATURES

• 2.9V to 4.5V Input Voltage Range

• Synchronous Boost Converter (ELVDD)

  4.6V to 5.0V Output Voltage with 100mV Steps

  4.6V Default Output Voltage

  1.2% Accuracy

  400mA Output Current Capability

  Output Voltage Sensing Pin for Path Loss Compensation (FBS)

• Synchronous Inverting Buck-Boost Converter (ELVSS)

  -5.4V to -1.4V Output Voltage with 100mV Steps

  -2.5V Default Output Voltage

  1.6% Accuracy at -2.5V (±40mV)

  400mA Output Current Capability

• Synchronous Boost Converter (AVDD)

  5.8V to 7.9V Output Voltage with 300mV Steps

  6.1V Default Output Voltage

  1.2% Accuracy

  100mA Output Current Capability

• VIN and VOUT Bi-Directional Isolation

• Short Circuit Protection (SCP)

• Overload Protection

• Thermal Shutdown

• VELVSS Start-Up Delay: 10ms

• Short Circuit and OLP Detect Time: 1ms

• Available in a Green TQFN-3×3-16L Package

APPLICATIONS

Smartphones & Tablets

Active Matrix OLED Displays