ADP124-3.3-EVALZ Analog Devices Inc, ADP124-3.3-EVALZ Datasheet - Page 4

• Manufacturer Part Number: ADP124-3.3-EVALZ
• Description: CMOS Linear Regulator Eval. Board
• Manufacturer: Analog Devices Inc

Specifications of ADP124-3.3-EVALZ

• Silicon Manufacturer: Analog Devices
• Application Sub Type: LDO
• Kit Application Type: Power Management - Voltage Regulator
• Silicon Core Number: ADP124
• Channels Per Ic: 1 - Single
• Voltage - Output: 3.3V
• Current - Output: 550mA (Max)
• Voltage - Input: 2.3 ~ 5.5 V
• Regulator Type: Positive Fixed
• Operating Temperature: -40°C ~ 85°C
• Board Type: Fully Populated
• Utilized Ic / Part: ADP124
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

UG-056
EVALUATION BOARD HARDWARE
EVALUATION BOARD CONFIGURATIONS
The
different components, depending on the version that is ordered.
Components common to both versions are C1, C2, TP1, TP2,
and J1. Figure 4, Figure 5, and Figure 6 show the schematics
of the various ADP124 and ADP125 evaluation board
configurations. Table 1 describes the components.
The ADP125 is the same as the ADP124 except that the output
voltage dividers are internally disconnected and the feedback
input of the error amplifiers is brought out for each output. The
output voltage can be set using the following formula:
The value of R1 should be less than 200 kΩ to minimize errors
in the output voltage caused by the ADJ pin input current. For
example, when R1 and R2 are equal to 200 kΩ, the output voltage
is 1.0 V. The output voltage error introduced by the ADJ pin input
current is 3 mV or 0.30%, assuming a typical ADJ pin input
current of 15 nA at 25°C.
ADP124/ADP125
V
OUT
V
OUT
= 0.5 V(1 + R1/R2) + (ADJ
V
Figure 4. ADP124 MSOP Evaluation Board Schematic
Figure 5. ADP125 MSOP Evaluation Board Schematic
C2
OUT
C2
TP2
R1
R2
TP2
TP3
VOUT
evaluation boards are supplied with
1
2
3
4
VOUT
VOUT
VOUT
SENSE
GND
1
2
3
4
TP3
VOUT
VOUT
ADJ
GND
U1
TP2
1
R1
R2
1
VIN
VIN
U1
NC
EN
VIN
VIN
I-BIAS
NC
EN
8
7
6
5
8
7
6
5
1µF
)(R1)
TP1
C2
J1
Figure 6. ADP124/ADP125 Evaluation Board Schematic, LFCSP
TP1
J1
C1
V
C1
IN
V
IN
1
2
3
4
Rev. B | Page 4 of 12
ADP124/ADP125
VOUT
VOUT
VSENSE/ADJ
GND
U1
Table 1. Evaluation Board Hardware Components
Component
U1
C1
C2
J1
TP1
TP2
TP3
R1, R2
1
Component depends on evaluation board type ordered.
1
VIN
VIN
NC
EN
8
7
6
5
Description
ADP124/ADP125 low dropout linear regulators
Input bypass capacitor, 1 μF, 0603 size
Output capacitor, 1 μF, 0603 size
Jumper (connects EN to VIN for automatic
startup)
Testpoint closer to VIN
Testpoint closer to VOUT
Testpoint closer to ADJ (ADP125 evaluation
board only)
0603 size feedback resistors between VOUT and
ADJ (ADP125 evaluation board only)
Evaluation Board User Guide
C1
1µF
1-WAY LINK
2
J1
TP1
1
1
VIN