MAX4470EVKIT+ Maxim Integrated, MAX4470EVKIT+ Datasheet - Page 2

• Manufacturer Part Number: MAX4470EVKIT+
• Description: Amplifier IC Development Tools OPERATIONAL AMPLIFIER
• Manufacturer: Maxim Integrated
• Series: MAX4464, MAX4470, MAX4471, MAX4472, MAX4474r

Specifications of MAX4470EVKIT+

• Operating Supply Voltage: 3 V or 5 V

MAX4470 Evaluation Kit
• MAX4470 EV kit
• 1.8V to 5.5V, 100mA DC power supply
• Voltmeter
The EV kit is fully assembled and tested. Follow the
steps below to verify board operation. Caution: Do not
turn on the power supply until all connections are
completed.
1) Set jumpers JU1, JU2, and JU3, as shown in Table 1,
2) Set the power supply to provide 5V, then disable the
3) Connect the power-supply positive terminal to the
4) Connect the power-supply ground to the GND PCB
5) Enable the power supply.
6) Verify that the OUT PCB pad is at 2.5V.
Table 1. Default Shunt Positions
Table 2. JU1, JU2, JU3 Jumper Functions
(IN-, IN+, REF)
2
CONFIGURATION
JUMPER
Super-capacitor
to configure the EV kit as an op-amp buffer to balance
super capacitors C1 and C2 charge.
power supply.
VDD PCB pad.
pad (near the VDD PCB pad).
______________________________________________________________________________________
JU1
JU2
JU3
Noninverting
Differential
OP-AMP
Inverting
Buffer
buffer
SHUNT POSITION
Not installed
Installed
2-3
Installed
installed
installed
JU1
Not
Not
SHUNT POSITION
Required Equipment
IN- = OUT (through R2)
DESCRIPTION
Quick Start
JU2
1-2
2-3
IN+ = VDD/2
Procedure
installed
Installed
JU3
Not
The MAX4470 EV kit contains the MAX4470 IC, which is
a rail-to-rail micropower op amp with an ultra-low 750nA
supply current designed in a 6-bump WLP package.
The EV kit operates from a single 1.8V to 5.5V DC power
supply.
The EV kit comes preconfigured as a buffer used
in a super-capacitor charge-balancing circuit. Super
capacitors offer exceptional charge storage density and
are widely used to prolong the life of weak batteries
subject to high current-load pulses, or to buffer a weak
energy source to a high-power load in energy-harvesting
devices. In such applications, it is common to have a
stack of super capacitors connected in series to achieve
the desired working voltage. The EV kit demonstrates
an active, super-capacitor charge-balancing circuit
that distributes the charge equally across two series-
connected super capacitors (C1 and C2) ensuring
identical voltage across each capacitor. This circuit
prevents overvoltage conditions from occurring across
either of the super capacitors due to a difference in
leakage currents and tolerance in the capacitor values.
The IC’s ultra-low-power consumption of 750nA and
CMOS inputs allow a power-efficient solution to the
super-capacitor charge-balancing problem.
While super-capacitor charge balancing is the featured
application, the EV kit also provides flexibility to easily
reconfigure the op amp into any of the four common
circuit topologies: inverting amplifier, noninverting ampli-
fier, differential amplifier, or buffer. Table 2 lists the JU1,
JU2, and JU3 jumper settings for the various op-amp
configurations. The configurations are described in the
next few sections.
Detailed Description of Hardware
Default Application Circuit
Op-Amp Configurations