Evaluation Board User Guide UG-412
Rev. 0 | Page 3 of 8
EVALUATION BOARD HARDWARE AND SCHEMATICS
EVALUATION BOARD CONFIGURATIONS
The ADP7182 evaluation boards come supplied with different
components, depending on which version of the board is ordered.
Components common to both versions are C1, C2, LK1, and LK2.
Resistors R1 and R2 are used to set the output voltage of
the adjustable output option. The output voltage is set by
V
OUT
= −1.22 V × (1 + R1/R2). With the values shown in Figure 3
and Figure 4, the output voltage is approximately −15 V.
For −1.22 V fixed output voltage operation, LK2 can be inserted or
a 0 Ω resistor can be installed for R1. Figure 4 shows the schematic
of this evaluation board configuration. The ADP7182 is rated
for output currents of up to −200 mA.
EN
VIN
VOUT
R
NR
J2
CON8
1
2
3
4
5
6
7
8
C1
2.2µF
TP2
1
J1
CON8
1
2
3
4
5
6
7
8
U1
ADP7182
VOUT
1
VOUT
2
ADJ/NC
3
GND
6
VIN
7
VIN
8
EN
4
NC
5
EPAD
EPAD
J3
CON4
1
2
3
4
C
NR
TP1
1
C2
2.2µF
J4
CON4
1
2
3
4
LK1
1 Way Link
12
R2
12k
TP3
1
R1
133k
J5
CON4
1
2
3
4
LK2
1 Way Link
12
J6
CON4
1
2
3
4
10708-004
Figure 3. LFCSP Evaluation Board Schematic
EN
VIN
VOUT
TP3
1
J1
CON8
1
2
3
4
5
6
7
8
R
NR
J4
CON4
1
2
3
4
LK2
1 Way Link
12
R2
12k
TP1
1
J5
CON4
1
2
3
4
LK1
1 Way Link
1
2
J6
CON4
1
2
3
4
C
NR
J2
CON8
1
2
3
4
5
6
7
8
C1
2.2µF
U1
ADP7182
GND
1
VIN
2
EN
3
ADJ/NC
4
OUT
5
R1
133k
J3
CON4
1
2
3
4
C2
2.2µF
TP2
1
10708-003
Figure 4. TSOT Evaluation Board Schematic
Table 1. Evaluation Board Hardware Components
Component Function Description
U1
1
Linear regulator ADP7182 linear regulator.
2.2 μF input bypass capacitor.
C2 Output capacitor 2.2 μF output capacitor. Required for stability and transient performance.
R1 Output divider Part of the external resistor divider (composed of R1 and R2) that sets the output voltage for the adjustable
option; V
OUT
= −15 V with the values shown in Figure 3 and Figure 4.
R2 Output divider Part of the external resistor divider (composed of R1 and R2) that sets the output voltage for the adjustable
option; V
OUT
= −15 V with the values shown in Figure 3 and Figure 4.
R
NR
Noise reduction Forms the noise reduction network (composed of R
NR
and C
NR
) for the adjustable option.
C
NR
Noise reduction Forms the noise reduction network (composed of R
NR
and C
NR
) for the adjustable option.
LK1, LK2 Jumper LK1 connects EN to VIN for automatic startup. To achieve −1.22 V with the adjustable output option,
LK2 must be installed to connect the ADJ pin to the output.
1
Component varies depending on the version of the evaluation board.
