MAX1747EVKIT Maxim Integrated Products, MAX1747EVKIT Datasheet - Page 2

• Manufacturer Part Number: MAX1747EVKIT
• Description: Power Management Modules & Development Tools MAX1747 EVAL KIT MAX1747 EVAL KIT
• Manufacturer: Maxim Integrated Products

Specifications of MAX1747EVKIT

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

MAX1747 Evaluation Kit
Note: Please indicate that you are using the MAX1747 when
contacting these component suppliers.
The MAX1747 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) Connect a voltmeter to the VOUT pad.
2) Verify that shunts are present across pins 1 and 2
3) Connect a +3.0VDC to +3.6VDC power supply to
4) Connect the supply ground to the GND pad.
5) Turn on the power supply and verify that the high-
6) Verify that the low-current negative charge pump
7) Verify that the low-current positive charge pump
For instructions on selecting the feedback resistors for
other output voltages, see the Evaluating Other Output
Voltages section. The input voltage range is +3.0V to
+3.6V when selecting the output voltage.
The MAX1747 EV kit contains a high-current step-up
DC-DC converter and two low-current charge-pump
circuits. The EV kit’s voltage input range is from +3.0V
to +3.6V as configured, and can be extended to oper-
ate in the +2.7V to +5.5V range. The high-current step-
up DC-DC converter output voltage can be adjusted
from +VIN to +5.5V with resistors.
2
Fairchild
Murata
Nihon
Taiyo Yuden
_______________________________________________________________________________________
of jumpers JU2 (SUPN) and JU3 (SUPP). Verify that
jumper JU1 (SHDN) does not have a shunt
installed.
the VIN pad.
current step-up DC-DC converter output (VOUT) is
+5V.
output (VN) is -7V.
output (VP) is +12V.
SUPPLIER
Component Suppliers
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Detailed Description
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Output
The low-current negative charge pump provides -7V
output; other negative output voltages can be evaluat-
ed by replacing two voltage feedback resistors. The
output can be adjusted to -8V.
The low-current positive charge pump provides a +12V
output (VP); other output voltages can be evaluated by
replacing two voltage feedback resistors. The output
can be adjusted up to +13V.
Jumper options allow either charge-pump circuit to be
fed power from the EV kit’s input (VIN) or the high-cur-
rent step-up DC-DC converter output (VOUT).
The MAX1747 switching frequency is determined by
resistor R8 and the voltage supplied to the EV kit input
pad (VIN). Applying a voltage in the range of +3.0V to
+3.6V to the VIN pad causes the switching frequency
to operate in the 980kHz to 1.23MHz range, respective-
ly.
An off-board CMOS or bipolar transistor can control the
EV kit’s shutdown feature.
The MAX1747 EV kit features a shutdown mode that
reduces the EV kit’s quiescent current to less than
60µA (typ). The two-pin jumper, JU1, selects the shut-
down modes for the MAX1747. Table 1 lists the selec-
table jumper options.
A CMOS open-drain or bipolar open-collector transistor
can be connected to the EV kit SHDN pad and ground
to control the shutdown mode. The shunt for jumper
JU1 must be removed for this feature to function.
The MAX1747 EV kit features an option to choose
which voltage source feeds the low-current negative
charge-pump circuit. Jumper JU2 selects the input volt-
age source for pin SUPN on the MAX1747. Table 2 lists
the options.
Table 1. Jumper JU1 Functions
LOCATION
Installed
SHUNT
None
Connected to GND
Connected to VIN
Low-Current Negative Voltage Source
SHDN PIN
via R8
Jumper Selection
operation up to 1.23MHz
MAX1747 enabled,
Shutdown mode,
Shutdown Mode
VOUT = 0
OUTPUT