MAX8902EVKIT+ Maxim Integrated, MAX8902EVKIT+ Datasheet - Page 2

• Manufacturer Part Number: MAX8902EVKIT+
• Description: Power Management IC Development Tools Evaluation Kit for the MAX8902A and MAX8902B
• Manufacturer: Maxim Integrated
• Type: LDO Controllers & Regulatorsr
• Series: MAX8902A, MAX8902Br

Specifications of MAX8902EVKIT+

• Product: Evaluation Kits
• Tool Is For Evaluation Of: MAX8902
• Input Voltage: 1.7 V to 5.5 V
• Output Current: 500 mA
• For Use With: MAX8902

The MAX8902 evaluation kit (EV kit) is a fully assembled
and tested PCB for evaluating the MAX8902A low-dropout
linear regulator (LDO). The EV kit operates from a 1.7V to
5.5V supply and provides a jumper-selectable output volt-
age of 1.5V, 1.8V, 2.0V, 2.5V, 3.0V, 3.1V, 3.3V, 4.6V, or
4.7V, with loads up to 500mA. The output-voltage setting
set by jumpers JU2 and JU3 is fixed at startup. Changing
these jumpers while the IC is operating has no effect. The
MAX8902 EV kit comes with the MAX8902A installed,
but can also be used to evaluate the MAX8902B.
To evaluate the MAX8902B, carefully remove the IC
(U1) and replace it with the MAX8902B. Remove the
shunt from jumper JU3. Install a shunt on JU2 in 1-2
position. Remove the 0Ω resistor from R1 and install R1
and R2 to set the desired output voltage.
The MAX8902B uses external feedback resistors to set the
output regulation voltage. The output can be set from 0.6V
to 5.3V. Set the lower feedback resistor (R2) to ≤ 120kΩ to
minimize FB input bias current error. Then calculate
the value of the upper feedback resistor (R1) as follows:
MAX8902 Evaluation Kit
Table 1. JU1 Settings
(MAX8902A and MAX8902B)
Figure 1. MAX8902 EV Kit Schematic
2
Detailed Description of Hardware
_______________________________________________________________________________________
Shutdown
1-2
R
1
Setting the MAX8902B Output Voltage
=
GND
POK
IN
R x
2
Evaluating the MAX8902B
1.7V TO 5.5V
OPEN
⎛
⎜
⎝
R3
V
V
JU3
OUT
FB
IN
3
2
1
−
JU2
1
10μF
⎞
⎟
⎠
C1
IN
3
2
1
Enable
2-3
JU1
IN
3
2
1
IN
1
5
4
3
IN
SELB
SELA
EN
MAX8902A
EP
U1
GND
where V
When setting the output to 0.6V, short R1 and leave
R2 open.
The MAX8902B has an open-drain power-OK output
(POK). POK pulls low to indicate that the output voltage
is in regulation. During startup, POK is high impedance
until the output voltage rises to 90% of its regulation
level. If an overload occurs at the output, or the output
is shut down, POK is high impedance. To use POK as a
logic-level output, install pullup resistor R3.
Jumper JU1 is provided to enable or disable the IC by
connecting EN to IN or GND. If an external enable sig-
nal is used, remove the shunt from JU1 and connect
the external signal to pin 2 of JU1. Ensure that the sig-
nal does not exceed 5.5V.
Table 2. JU2 and JU3 Settings
(MAX8902A Only)
2
OUTS
OUT
BP
OUTPUT VOLTAGE (V)
8
7
6
FB
is the feedback regulation voltage of 0.6V.
C2
0.01μF
C5
OPEN
1.5
1.8
2.0
2.5
3.0
3.1
3.3
4.6
4.7
R1
0Ω
R2
OPEN
C3
10μF
POK Output (MAX8902B)
500mA MAX
Open
Open
Open
C4
OPEN
JU2
2-3
1-2
1-2
1-2
2-3
2-3
OUT
GND
Enable
Open
Open
Open
JU3
1-2
2-3
1-2
2-3
1-2
2-3