MAX1748EVKIT Maxim Integrated Products, MAX1748EVKIT Datasheet - Page 3

• Manufacturer Part Number: MAX1748EVKIT
• Description: Power Management Modules & Development Tools MAX1748 EVAL KIT MAX1748 EVAL KIT
• Manufacturer: Maxim Integrated Products

Specifications of MAX1748EVKIT

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

The MAX1748 EV kit features an option to choose which
voltage source feeds the negative charge-pump regula-
tor circuit. Jumper JU5 selects the input voltage source
for the MAX1748’s SUPN pin. Table 5 lists the options.
The MAX1748 EV kit’s boost switching-regulator output
is set to +10V by feedback resistors (R1, R2). To gener-
ate output voltages other than +10V (+2.7V to +13V),
select different external voltage-divider resistors (R1,
R2). The ceramic capacitors (C17, C18, C20) are rated
to +10V. To set the voltage >+10V, use higher-voltage-
rated capacitors. Refer to the Output Voltage Selection
section in the MAX1748 data sheet for instructions on
selecting the resistors. The input voltage range will be
+2.7V to V
The MAX1748 EV kit’s positive charge-pump regulator
output is set to +15V by feedback resistors (R3, R4). To
generate output voltages other than +15V, select differ-
ent external voltage-divider resistors (R3, R4). Refer to
Table 1. Jumper JU1 Functions
Table 2. Jumper JU2 Functions
Table 3. Jumper JU3 Functions
(cut open trace across
(cut open trace across
1-2 , short across 2-3)
1-2, short across 2-3)
(PC trace shorts 1-2)
(PC trace shorts 1-2)
SHUNT LOCATION
SHUNT LOCATION
SHUNT LOCATION
Positive Charge-Pump Output Voltages
2, 3
1-2
2-3
1-2
2-3
1-2
PIN
when selecting other output voltages.
Output Voltage Selection
_______________________________________________________________________________________
Boost Switching-Regulator
Connected
Connected
Connected
SHDN PIN
Connected
Connected
Connected
to GND
to VNA
to VPA
to PIN
to VN
to VP
R3
R5
Negative Voltage Source
Output Voltages
Regulate VN, -5V
output voltage
Regulate VNA,
negative doubler
output voltage
MAX1748 enabled,
V1 = +10V
Shutdown mode,
V1 = P
Regulate VP, doubler
output voltage
Regulate VPA, tripler
output voltage
OPERATING MODE
OPERATING MODE
MAX1748 OUTPUT
IN
- V
DIODE
MAX1748 Evaluation Kit
the Output Voltage Selection section in the MAX1748
data sheet for instructions on selecting the resistors. See
Table 4 for the jumper selection of input voltage ranges.
Check that the capacitor voltage rating is adequate for
the configuration.
The MAX1748 EV kit features a positive charge-pump
voltage tripler circuit. Three components (C10, C11, D4)
must be installed and jumper JU2 modified to utilize the
tripler circuit. Capacitors C10 and C11 should be 0.1µF
(Taiyo Yuden, UMK212BJ104MG recommended) with a
voltage rating equal to or greater than the expected out-
put voltage at VPA. Lower cost diodes with higher for-
ward voltage drops can be used for D4, if enough volt-
age headroom is available. The shorted PC trace across
pinholes 1 and 2 must be cut open and a jumper wire
installed in pinholes 2 and 3 at jumper JU2. Note: VPA
will now be the regulated output.
To generate a different voltage, select proper voltage-
divider resistors (R3, R4) while taking into consideration
input voltages and jumper settings. Refer to the Output
Voltage Selection section in the MAX1748 data sheet for
instructions on selecting the resistors. See Table 4 for
jumper selection of input voltage ranges.
The MAX1748 EV kit’s negative charge-pump regulator
output is set to -5V by feedback resistors (R5, R6). To
generate different voltages, select different external volt-
age-divider resistors (R5, R6) while taking into consider-
ation input voltages and jumper settings. Refer to the
Output Voltage Selection section in the MAX1748 data
sheet for instructions on selecting the resistors. See
Table 5 for the jumper selection of input voltage ranges.
The MAX1748 EV kit features a negative charge-pump
voltage doubler circuit. Three components (C12, C13,
D5) must be installed and jumper JU3 modified to utilize
the doubler circuit. Capacitors C12 and C13 should be
0.1µF (Taiyo Yuden UMK212BJ104MG recommended)
with a voltage rating equal to or greater than the expect-
ed output voltage at VNA. Lower cost diodes with higher
forward voltage drops can be used for D5 if enough volt-
age headroom is available. The shorted PC trace across
pinholes 1 and 2 must be cut open and a jumper wire
installed in pinholes 2 and 3 at jumper JU3.
To generate a different negative output voltage, select
different external voltage-divider resistors (R5, R6) while
taking into consideration input voltages and jumper set-
tings. Refer to the Output Voltage Selection section in
the MAX1748 data sheet for instructions on selecting the
Negative Charge-Pump Output Voltages
Negative Doubler Charge-Pump
Positive Tripler Charge-Pump
Output Voltages
Output Voltages
3