MAX1678EVKIT Maxim Integrated, MAX1678EVKIT Datasheet - Page 2

• Manufacturer Part Number: MAX1678EVKIT
• Description: Power Management IC Development Tools Evaluation Kit for the MAX1678
• Manufacturer: Maxim Integrated
• Series: MAX1678r

Specifications of MAX1678EVKIT

• Output Voltage: 3.3 V
• Output Current: 45 mA

Two jumpers on the PC board allow selection of several
configurations. Table 1 lists the jumper functions. Table
2 lists the jumper positions when setting the board for
3.3V operation.
MAX1678 Evaluation Kit
Table 1. Jumper Functions
Table 2. Jumper Positions for Normal 3.3V Operation
Figure 1. MAX1678 EV Kit Schematic
2
JUMPER SHUNT POSITION
JUMPER SHUNT POSITION
_______________________________________________________________________________________
J1
J1
J1
J2
J2
J1
J2
SHDN
BATT
GND
Shorted
Shorted
Open
Open
1 & 2
2 & 3
1 & 2
J1
Detailed Description
1
2
3
SHDN connected to BATT
SHDN connected to GND
SHDN not controlled by the board
FB pin connected to GND
FB pin connected to the resistor-divider
R2
OPEN
R1
1M
1%
Jumper Selections
FB pin connected to GND
SHDN pin connected to BATT
C1
10 F
PIN CONNECTION
PIN CONNECTION
1
4
2
6
BATT
SHDN
PFI
GND
MAX1678
47 H
U1
L1
OUT
PFO
LX
FB
The final circuit performance is determined by the quality
of the components surrounding the MAX1678. The input
and output capacitors must have low equivalent-series-
resistance (ESR) to handle the high peak currents found
in switching regulators. Low ESR is especially critical in
low-voltage circuits to reduce the output ripple. Ceramic
capacitors are supplied on the MAX1678 EV kit because
of their small size and low ESR in the value range need-
ed for the circuit.
7
8
5
3
J2
The MAX1678 is enabled.
The MAX1678 is disabled.
SHDN must be driven by a signal connected to the
SHDN pad.
VOUT is preset to 3.3V.
A resistor must be installed in R3 to set the output volt-
age. See the MAX1678 data sheet for more information.
R3
OPEN
R4
1M
1%
The MAX1678 is enabled.
VOUT is preset to 3.3V.
C2
10 F
MAX1678 OPERATION
MAX1678 OPERATION
R5
100k
Component Selection
OUT
GND
PFO