2 A/1.2 A DC-to-DC Switching Regulator with

Independent Positive and Negative Outputs

Data Sheet

ADP5071

Rev. A

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FEATURES

Wide input supply voltage range: 2.85 V to 15 V

Generates well regulated, independently resistor

Adjustable positive output to 39 V

Integrated 2.0 A main switch

Optional single-ended primary-inductor converter

(SEPIC) configuration for automatic step-up/step-down

Integrated 1.2 A main switch

True shutdown for both positive and negative outputs

1.2 MHz/2.4 MHz switching frequency with optional external

frequency synchronization from 1.0 MHz to 2.6 MHz

Resistor programmable soft start timer

Slew rate control for lower system noise

Individual precision enable and flexible start-up sequence

Out-of-phase operation

UVLO, OCP, OVP, and TSD protection

4 mm × 4 mm, 20-lead LFCSP and 20-lead TSSOP

−40°C to +125°C junction temperature range

Supported by the ADIsimPower tool set

APPLICATIONS

Bipolar amplifiers, ADCs, DACs, and multiplexers

Charge-coupled device (CCD) bias supply

Optical module supply

RF power amplifier (PA) bias

TYPICAL APPLICATION CIRCUIT

ADP5071

SS

INBK

SW1

COMP1

COMP2

VREG

EN1

SYNC/FREQ

SLEW

SEQ

EN2

AGND

PVIN1

PVIN2

PVINSYS

FB1

D1

L1

L2

SW2

PGND

FB2

VREF

D2

Figure 1.

GENERAL DESCRIPTION

The ADP5071 is a dual high performance dc-to-dc regulator that

generates independently regulated positive and negative rails.

The input voltage range of 2.85 V to 15 V supports a wide variety of

applications. The integrated main switch in both regulators enables

generation of an adjustable positive output voltage up to +39 V

and a negative output voltage down to −39 V below input voltage.

The ADP5071 operates at a pin selected 1.2 MHz/2.4 MHz

switching frequency. The ADP5071 can synchronize with an

external oscillator from 1.0 MHz to 2.6 MHz 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).

Flexible start-up sequencing is provided with the options of

manual enable, simultaneous mode, positive supply first, and

negative supply first.

The ADP5071 includes a fixed internal or resistor programmable

soft start timer to prevent inrush current at power-up. During

shutdown, both regulators completely disconnect the loads from

the input supply to provide a true shutdown.

Other key safety features in the ADP5071 include overcurrent

protection (OCP), overvoltage protection (OVP), thermal

shutdown (TSD), and input undervoltage lockout (UVLO).

The ADP5071 is available in a 20-lead LFCSP or in a 20-lead

TSSOP and is rated for a −40°C to +125°C junction temperature

range.

Table 1. Family Models

Model

Boost Switch (A)

Inverter Switch (A)

ADP5070

1.0

0.6

ADP5071

2.0

1.2