MAX1543EVKIT Maxim Integrated Products, MAX1543EVKIT Datasheet - Page 3

• Manufacturer Part Number: MAX1543EVKIT
• Description: Power Management Modules & Development Tools MAX1543 EVAL KIT MAX1543 EVAL KIT
• Manufacturer: Maxim Integrated Products

Specifications of MAX1543EVKIT

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

and the drain of the switch (COM) is used as an output.
The startup delay time is set with an external capacitor at
the DEL pin. Refer to the Delay Control Circuit section in
the MAX1543 data sheet for information on setting the
delay time.
The switch between the SRC and COM pins and the
switch between the COM and DRN pins can be con-
trolled by jumper JU2 or by external logic connected to
the CTL pad. See Table 2 for switch states and refer to
the Delay Control Circuit section in the MAX1543 data
sheet for further information about the high-voltage
switches connected to the COM pin.
The MAX1543 EV kit also evaluates the MAX1542. To
evaluate the MAX1542, replace U1 with a MAX1542 IC
(refer to the MAX1542/MAX1543 data sheet for specifi-
cations of the MAX1542).
The MAX1543 EV kit features an option to choose the
step-up regulator switching frequency. Jumper JU1
selects the switching frequency. Table 1 lists the selec-
table jumper options. The EV kit is configured for
1.2MHz operation. Optimum performance at lower fre-
quencies requires a larger inductor value (refer to the
Table 1. Jumper JU1 Functions
Table 2. Jumper JU2 Functions
SHUNT LOCATION
Installed (default)
LOCATION
Installed
(default)
SHUNT
Switching-Frequency Selection (FREQ)
None
None
None
_______________________________________________________________________________________
Connected to GND
Connected to VIN
Connected to PGND
Connected to VIN
through R7
FREQ PIN
Connected to
external logic
through R18
CTL PIN
Jumper Selection
MAX1543 EV KIT
FREQUENCY
COM connected to SRC (GON, +22V)
COM connected to DRN
Logic low, COM connected to DRN;
logic high, COM connected to SRC
(GON, +22V)
1.2MHz
600kHz
MAX1543 COM
MAX1543 Evaluation Kit
Inductor Selection section in the MAX1542/MAX1543
data sheet).
The MAX1543 EV kit features an option to control the
high-voltage switches between SRC, COM, and DRN
on the MAX1543 or the high-voltage switch between
SRC and COM on the MAX1542. Table 2 lists the selec-
table JU2 jumper options.
The MAX1543 EV kit’s step-up switching-regulator out-
put (VMAIN) is set to +8V by feedback resistors R1 and
R2. To generate output voltages other than +8V (up to
+13V), select different external voltage-divider resis-
tors, R1 and R2. Note that changing the VMAIN voltage
setting also changes the GON and GOFF charge-pump
output voltages. Output capacitors C4 and C5 are
rated for +10V. To set the output voltage greater than
+10V, use higher voltage-rated capacitors. Refer to the
Main Step-Up Converter and Output Voltage sections in
the MAX1542/MAX1543 data sheet for instructions on
selecting resistors R1 and R2.
The MAX1543’s operational amplifiers are configured
as unity-gain buffers by the PC board traces shorting
R14 between NEG1 and OUT1 and R16 between NEG2
and OUT2. The voltages at the noninverting inputs
POS1 and POS2 are set to half of VMAIN by voltage-
divider resistors (R3, R4) and (R5, R6), respectively. To
set VOUT1 and VOUT2 to other voltages (up to
VMAIN), select different divider resistors.
Operational-Amplifier Output Voltages
Step-Up Switching-Regulator Output
High-Voltage Switch Control (CTL)
Output-Voltage Selection
COM connected to SRC (GON, +22V)
COM disconnected from SRC (GON, +22V)
Logic low, COM disconnected from SRC
(GON, +22V); logic high, COM connected
to SRC (GON, +22V)
MAX1542 COM
(VOUT1 and VOUT2)
Voltage (VMAIN)
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