MAX668EVKIT Maxim Integrated, MAX668EVKIT Datasheet - Page 2

• Manufacturer Part Number: MAX668EVKIT
• Description: Power Management IC Development Tools Evaluation Kit for the MAX668 MAX669
• Manufacturer: Maxim Integrated
• Series: MAX668, MAX669r

Specifications of MAX668EVKIT

• Output Voltage: 3 V to 28 V
• Output Current: 1000 mA

MAX668 Evaluation Kit
Note: Please indicate that you are using the MAX668 when con-
tacting these component suppliers.
The MAX668 EV kit is fully assembled and tested. Follow
these steps to verify board operation. Do not turn on
the power supply until all connections are completed.
1) Place the shunt on JU1 across pins 1 and 2. Verify
2) Connect a +5V supply to the V
3) Connect a voltmeter to the V
4) Turn on the power supply and verify that the output
The MAX668 EV kit provides a regulated +12V output
voltage from an input source as low as +3V. It drives
loads up to 1A with greater than 90% conversion effi-
ciency. This EV kit is shipped configured in the non-
bootstrapped mode (V
are several methods of connecting V
depending on the specific design including input and
output voltage range, quiescent power dissipation,
MOSFET selection, and load.
2
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that the shunt is across JU2 pins 2 and 3 (V
tied to V
ground to the GND pad.
voltage is 12V.
_______________________________________________________________________________________
SUPPLIER
IN
) and JU3 is open (LDO is open).
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CC
PHONE
is tied to V
OUT
pad.
IN
IN
). However, there
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pad. Connect
CC
FAX
and LDO
CC
is
If the minimum input voltage is below +3.0V, use the
MAX669 with V
bootstrapped mode, if V
then LDO may be shorted to V
dropout voltage of the LDO regulator. This increases the
gate drive to the MOSFET, which lowers the MOSFET
on-resistance but increases the MAX668 supply current
due to gate-charge loss.
If V
powered from V
dissipation, especially when V
always less than +5.5V, LDO may be shorted to V
eliminate the dropout voltage of the LDO regulator. If
V
still want to bootstrap from V
to the MOSFET at the expense of power dissipation. If
V
always be tied to V
will not increase the gate drive from LDO, but quiescent
power dissipation will rise. Jumpers JU2 and JU3 con-
trol the V
data sheet).
The 3-pin header JU1 selects shutdown mode. Table 1
lists the selectable jumper options. The 3-pin header
JU2 selects bootstrapped mode. Table 2 lists the
selectable jumper options. For V
the 2-pin header JU3 to short LDO to V
nates the internal linear regulator (LDO) dropout volt-
age. For the MAX668, this allows operation with input
voltages down to 2.7V. Table 3 lists the selectable
jumper options.
The MAX668 EV kit can also be used to evaluate other
output voltages. Refer to the Output Voltage Selection
section in the MAX668 data sheet for instructions on
selecting the feedback resistors R2 and R3. For output
voltages greater than 15V, replace C5 (20V) with a
capacitor that has a higher voltage rating.
In addition to the standard EV kit configuration of 3V
to 12V
Capabilities table listed several common Input/Output
combinations. Table 4 lists the components recom-
mended for these alternative circuits.
IN
IN
IN
is in the range of +3V to +4.5V, then the user may
is always greater than +4.5V, the V
is greater than +3.0V, the MAX668’s V
OUT
CC
at 1A, the EV Kit Application Circuit
and LDO inputs (see MAX668/MAX669
CC
IN
. This will decrease quiescent power
bootstrapped from V
IN
, since bootstrapping from V
OUT
Other Output Voltages
OUT
is always less than +5.5V,
OUT
CC
Jumper Selection
to increase gate drive
CC
less than 5.5V, use
is large. If V
to eliminate the
OUT
CC
CC
input should
(Table 1). In
. This elimi-
CC
can be
CC
IN
OUT
IN
to
is