Dual SMPS Outputs, LDO, and Dual Charge Pumps with I²C Interface for OLED

The MAX17065 provides the power-supply rails for active-matrix, organic light-emitting diode (OLED) displays.

The MAX17065 includes a step-up DC-DC converter, an inverting DC-DC converter, a regulated positive charge pump, a regulated negative charge pump, and a low-dropout linear regulator (LDO). Synchronous rectifiers are integrated into the IC, eliminating the need for external power components. An I²C interface is used to program the switching frequency, the operating mode, and the cycle-by-cycle current limit of the noninverting and step-up converters, as well as the output voltages of the inverting converter and the charge pumps. Efficiency of 94% can be achieved for the step-up and 83% for the inverting converter.

The MAX17065 is packaged into a space-efficient 28-pin, 4mm x 4mm TQFN package with an exposed backside pad (EP) to enhance thermal characteristics.

Applications

* Cell Phones * Digital Still Cameras * MP3 Players

* 2.3V to 4.5V Input Voltage Supply Range

* Fixed +5.35V Step-Up DC-DC Converter

* Adjustable -0.5V to -5.0V Inverting DC-DC Converter

* Adjustable 450mA/700mA Cycle-by-Cycle Current Limit for DC-DC Converters

* Selectable SKIP or Forced-PWM Mode for DC-DC Converters

* 600kHz/1.2MHz Selectable Fixed-Switching Frequency

* +5.5V to +9.0V Adjustable Positive-Regulated Charge Pump

* -5.0V to -0.5V Adjustable Negative-Regulated Charge Pump

* +1.9V 60mA LDO

* Integrated Synchronous Rectifiers

* True Shutdown™

* Output Undervoltage Shutdown with 100ms Timer

* Startup Sequence with 4ms Soft-Start

* 3µA (typ) Shutdown Supply Current

* Thermal Shutdown with 15ms Timer

* I²C Interface Control

* Greater than 90% Efficiency

* Small, 4mm x 4mm, 28-Pin Thin QFN