New Industry Products

Switching Regulator with Independent Positive and Negative Outputs

September 23, 2019 by Paul Shepard

The ADP5076 from Analog Devices is a dual, high performance, dc-to-dc regulator that generates independently regulated positive and negative rails. The input voltage range of 2.85V to 5.5V supports a wide variety of applications. The integrated main switch in both regulators enables generation of an adjustable positive output voltage up to +30V and a negative output voltage down to −30V.

Applications for the ADP5076 are expected to include: Bipolar amplifiers, ADCs, DACs, and multiplexers; Charge coupled device (CCD) bias supply; Optical module supply; RF power amplifier bias; and Time of flight module supply.

The ADP5076 operates at a pin selected 1.2MHz or 2.4MHz switching frequency. The ADP5076 can synchronize with an external oscillator from 1.0MHz to 2.6MHz to ease noise filtering in sensitive applications. Both regulators implement programmable slew rate control circuitry for the MOSFET driver stage to reduce electromagnetic interference (EMI).

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Flexible start-up sequencing is provided with the options of manual enable, simultaneous mode, positive supply first, and negative supply first.

The ADP5076 includes a fixed internal or resistor programmable soft start timer to prevent inrush current at power-up. Other key safety features in the ADP5076 include overcurrent protection (OCP), overvoltage protection (OVP), thermal shutdown (TSD), and input undervoltage lockout (UVLO).

Summary of features and specifications:

  • Input supply voltage range: 2.85V to 5.5V
  • Generates well regulated, independently resistor programmable VPOS and VNEG outputs
  • Boost regulator to generate VPOS output
    • Adjustable positive output to 35V
    • Integrated 2.0A main switch
  • Inverting regulator to generate VNEG output
    • Adjustable negative output to −30V
    • Integrated 1.20A main switch
  • 2MHz or 2.4MHz switching frequency with optional external frequency synchronization from 1.0MHz to 2.6MHz
  • Resistor programmable soft start timer
  • Slew rate control for lower system noise
  • Individual precision enable and flexible start-up sequence control for symmetric start, VPOS first, or VNEG first
  • Out of phase operation
  • UVLO, OCP, OVP, and TSD protection

The ADP5076 is available in a 20-ball wafer level chip scale package (WLCSP) and is rated for a −40°C to +125°C junction temperature range.