ADP5072 that can control positive and negative power supplies independently

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The ADP5072 features independent control of positive and negative power supplies

When designing analog circuits, there are cases where not only a positive power supply but also a negative power supply is required for various sensors including CCDs, operational amplifiers, A/D converters, etc.
In this case, using an IC that can supply positive and negative power supplies on a single chip not only makes it possible to miniaturize the circuit, but also reduces costs and improves reliability by reducing the number of components, as well as reducing design man-hours.

This article explains the following three major features of the ADP5072 positive and negative power supply IC.

Independently Adjustable/Controllable Positive and Negative Supplies
Perfect EMI/noise countermeasures
Small size and high efficiency even for positive and negative power supplies

1. Independent adjustment/control of positive and negative power supplies

The ADP5072 has an input voltage range of 2.85 V to 5.5 V, and outputs up to 35 V/1 A for the positive supply and −30 V/0.6 A for the negative supply. The wide output voltage range is suitable for positive and negative power supply circuits in a variety of applications.

The ADP5072's internal positive and negative power supply circuits are separate and can be configured independently.
The device also features flexible start-up sequencing, allowing manual enable, simultaneous mode, and positive or negative supply priority.

Below is the internal circuit diagram of the ADP5072.

ADP5072 Internal Schematic (Source: Excerpt from ADP5072 datasheet)

2. Perfect EMI and noise countermeasures

The ADP5072 contains programmable slew rate control circuitry.
This circuit reduces the slew rate of the switching node as shown in the figure below.
The result is less ringing and lower EMI.

The ADP5072 can also be synchronized with an external oscillator from 1.0 MHz to 2.6 MHz.
This feature facilitates noise filtering in noise sensitive applications.

Reduce ringing by switching nodes with different slew rates (Source: Excerpt from ADP5072 datasheet)

3. Small size and high efficiency even for positive and negative power supplies

The ADP5072 is available in a small 1.61 mm x 2.18 mm WLCSP package and features a switching frequency of 1.2 MHz or 2.4 MHz, allowing the use of small inductors, making the ADP5072 suitable for space-constrained applications.
As an example, the recommended layout for an input voltage N = 3.3 V, positive supply = 12 V/100 mA, and negative supply = −3.2 V/60 mA is 7.8 mm x 8.8 mm.

Additionally, the ADP5072's high efficiency contributes to lower power consumption in applications.

Recommended layout for input voltage = 3.3 V, positive supply = 12 V, 100 mA, negative supply = −3.2 V, 60 mA (Source: ADP5072 datasheet)

Efficiency at ±15V output (Ta=25°C). Positive power supply on the left, negative power supply on the right. (Source: Excerpt from ADP5072 datasheet)

Analog Devices Positive and Negative Power Supply IC Lineup

In addition to the ADP5072, Analog Devices has released a variety of other positive and negative power supply ICs.
It is also possible to configure positive and negative power supplies by combining micro modules and LDOs.

For more information, please refer to the positive and negative power supply design.

	ADP5072	ADP5070 / 71	LT3471
Input voltage range	2.85V to 5.5V	2.85V to 15V	2.4V to 16V
output voltage	Positive supply +35V Negative power supply -30V	Positive supply +39V. Negative power supply -39V	Positive supply +40V. Negative power supply -40V
output current	Positive power supply 1.0A Negative power supply 0.6A	ADP5070: Positive power supply 1.0A Negative power supply 0.6A ADP5071: Positive power supply 2.0A Negative power supply 1.2A	Positive supply 0.9A Negative power supply 0.9A
Slew rate control	can be	can be	none
Sequence control	can be	can be	none
package size	2.18mm x 1.61mm 20-ball WLCSP	4mm x 4mm 20-lead LFCSP 20-lead TSSOP	3mm x 3mm 10-Lead DFN

Lineup of positive and negative power supply ICs

Application example

Power supplies for operational amplifiers, A/D converters, D/A converters, etc. that require positive and negative power supplies
CCD bias power supply
optical module power supply
ToF (Time of Flight) module power supply