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ADP5076ACBZ-R7 Datasheet(PDF) 16 Page - Analog Devices

Part # ADP5076ACBZ-R7
Description  2 A/1.2 A DC-to-DC Switching Regulator with Independent Positive and Negative Outputs
PDF  23 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADP5076ACBZ-R7 Datasheet(HTML) 16 Page - Analog Devices

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ADP5076
Data Sheet
Rev. A | Page 16 of 23
APPLICATIONS INFORMATION
COMPONENT SELECTION
Feedback Resistors
The ADP5076 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 × IFB1 or
10 × IFB2.
Set the positive output for the boost regulator by
1
FT1
POS
FB1
FB1
R
VV
R

 


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

FT2
NEG
FB2
REF
FB2
FB2
R
VV
V
V
R

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 for Boost Regulator
Desired Output Voltage (V)
 
Boost Regulator
RFT1 (MΩ)
RFB1 (kΩ)
Calculated Output Voltage (V)
+4.2
0.432
102
4.188
+5
0.604
115
5.002
+9
1.24
121
8.998
+12
1.4
100
12.000
+13
2.1
137
13.063
+15
2.43
137
14.990
+18
2.15
100
18.000
+20
2.55
107
19.865
+24
3.09
107
23.903
+30
3.65
100
30.000
Table 9. Recommended Feedback Resistor Values for Inverting Regulator
Desired Output Voltage (V)
 
Inverting Regulator
RFT2 (MΩ)
RFB2 (kΩ)
Calculated Output Voltage (V)
−1.8
0.332
102
−1.804
−3
0.475
100
−3.000
−3.3
0.523
102
−3.302
−4.2
0.715
115
−4.174
−5
1.15
158
−5.023
−9
1.62
133
−8.944
−12
1.15
71.5
−12.067
−13
2.8
162
−13.027
−15
2.32
118
−14.929
−18
2.67
113
−18.103
−20
2.94
113
−20.014
−24
3.16
102
−23.984
−30
4.12
107
−30.004



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