General Description

The MAX77720 dual-output DC-DC converter generates

two independently regulating positive and negative

supply voltages. The positive output delivers up to 4W of

power at the output while the negative output delivers up

to 4.8W of power. The MAX77720 is ideal for powering

time of flight (ToF) imaging sensors and OLED displays

in smart internet of things (IoT) devices.

The MAX77720 generates an adjustable negative output

down to -24V and a positive output voltage up to +20V.

The negative output operates at a fixed 1.5MHz

frequency while the positive output operates at a fixed

1MHz frequency to ease noise filtering in sensitive

applications and to reduce external component size.

The nERR pin, when connected to an external device’s

output pin, is used to disable the regulators to signal an

external error. This error can be cleared through I2C

from a host processor to re-enable the regulators. While

in the error on state, there is an option for the active

discharge to be enabled or disabled (for example, to set

the regulator outputs to a high-Z floating).

A bidirectional I2C serial interface allows for configuring

and checking the status of the devices. Numerous

factory-programmable options allow the device to be

tailored for many applications, enabling faster time to market.

Benefits and Features

• 2.5V to 5.5V Input Voltage Range

• Programmable Output-Voltage Range (Up to +20V

and Down to -24V)

• Flexible and Configurable

o I2C Interface

o Factory OTP Settings Available

o Programmable Turn-On and -Off Delay

Between Rails

• 1.2V to 3.6V VIO-Compatible

• True Shutdown™ for Boost

• Programmable Peak Current Limit for Boost (Up to

1A and Down to 0.5A)

• Thermal-Shutdown Protection

• Fault-Condition Flag

• Error Pin for External Sensor Fault Condition

• Controlled Inrush Current During Soft-Start

• -40°C to +125°C Operating Temperature Range

• Small Size

o 3.86mm2 Wafer-Level Package (WLP)

o 20-Bump, 0.4mm-Pitch, 5 x 4 Array

Key Applications

• ToF Sensors

• OLED Displays

• Bipolar Amplifiers