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ADP5072 Features Independent Control of Positive and Negative Power Supplies
When designing analog circuits, not only positive power supplies but also negative power supplies may be required for various sensors including CCD, operational amplifiers, A/D converters, etc.
In that case, if you use an IC that can supply positive and negative power supplies with a single chip, you can not only make the circuit smaller, but also reduce costs and improve reliability by reducing the number of parts, and you can also reduce design man-hours.
This article explains the following three major features of the ADP5072 positive/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 on the positive supply and -30 V/0.6 A on the negative supply. The wide output voltage range is suitable for positive and negative power supply circuits for various applications.
The internal circuits that generate the positive and negative supplies of the ADP5072 are independent and can be configured independently.
It also features a flexible start-up sequence with manual enable, simultaneous mode, and adjustable positive or negative supply priority.
Below is the internal schematic of the ADP5072.
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.
3. Small size and high efficiency even for positive and negative power supplies
The ADP5072 has a compact 1.61 mm x 2.18 mm WLCSP package and a switching frequency of 1.2 MHz or 2.4 MHz, allowing the use of small inductors. This makes the ADP5072 suitable for space-saving applications as well.
As an example, the recommended layout for an input voltage N = 3.3 V, positive supply = 12 V/100 mA, negative supply = −3.2 V/60 mA would be 7.8 mm x 8.8 mm.
The ADP5072's high efficiency also contributes to lower power consumption in applications.
Analog Devices Positive and Negative Power Supply IC Lineup
Analog Devices has released various positive and negative power supply ICs besides the ADP5072.
It is also possible to configure positive and negative power supplies by combining micromodules and LDOs.
For more information, please refer to Plus/Minus Power Supply Design.
|
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
