ADP5070AREZ-R7 datasheet(18/28 Pages) AD

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Data Sheet

ADP5070

Rev. A | Page 17 of 27

APPLICATIONS INFORMATION

ADIsimPOWER DESIGN TOOL

The ADP5070 is supported by the ADIsimPower design toolset.

ADIsimPower is a collection of tools that produce complete power

designs optimized to a specific design goal. These tools allow the

user to generate a full schematic, bill of materials, and calculate

performance in minutes. ADIsimPower can optimize designs

for cost, area, efficiency, and parts count while taking into

consideration the operating conditions and limitations of the IC

and all real external components. The ADIsimPower tool can be

found at www.analog.com/adisimpower, and the user can

request an unpopulated board through the tool.

COMPONENT SELECTION

Feedback Resistors

The ADP5070 provides an adjustable output voltage for both boost

and inverting regulators. An external resistor divider sets the output

voltage where the divider output must equal the appropriate

feedback reference voltage, VFB1 or VFB2. To limit the output voltage

accuracy degradation due to feedback bias current, ensure that the

current through the divider is at least 10 times IFB1 or IFB2.

Set the positive output for the boost regulator by













FB1

FT1

FB1

POS

where:

VPOS is the positive output voltage.

VFB1 is the FB1 reference voltage.

RFT1 is the feedback resistor from VPOS to FB1.

RFB1 is the feedback resistor from FB1 to AGND.

Set the negative output for the inverting regulator by

(

)

FB2

REF

FB2

FT2

FB2

NEG

−

where:

VNEG is the negative output voltage.

VFB2 is the FB2 reference voltage.

RFT2 is the feedback resistor from VNEG to FB2.

RFB2 is the feedback resistor from FB2 to VREF.

VREF is the VREF pin reference voltage.

Table 8. Recommended Feedback Resistor Values

Desired Output

Voltage (V)

Boost/SEPIC Regulator

Inverting Regulator

RFT1 (MΩ)

RFB1 (kΩ)

Calculated

Output Voltage (V)

RFT2 (MΩ)

RFB2 (kΩ)

Calculated

Output Voltage (V)

±1.8

0.143

115

1.795

0.332

102

−1.804

±3

0.316

115

2.998

0.475

100

−3.000

±3.3

0.357

115

3.283

0.523

102

−3.302

±4.2

0.432

102

4.188

0.715

115

−4.174

±5

0.604

115

5.002

1.15

158

−5.023

±9

1.24

121

8.998

1.62

133

−8.944

±12

1.4

100

12.000

1.15

71.5

−12.067

±13

2.1

137

13.063

2.8

162

−13.027

±15

2.43

137

14.990

2.32

118

−14.929

±18

2.15

100

18.000

2.67

113

−18.103

±20

2.55

107

19.865

2.94

113

−20.014

±24

3.09

107

23.903

3.16

102

−23.984

±30

3.65

100

30.000

4.12

107

−30.004

±35

5.9

137

35.253

5.11

115

−34.748

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