MAX1776EVKIT Maxim Integrated, MAX1776EVKIT Datasheet - Page 2

• Manufacturer Part Number: MAX1776EVKIT
• Description: Power Management IC Development Tools Evaluation Kit for the MAX1776
• Manufacturer: Maxim Integrated
• Type: DC/DC Converters, Regulators & Controllersr
• Series: MAX1776r

Specifications of MAX1776EVKIT

• Product: Evaluation Kits
• Tool Is For Evaluation Of: MAX1776
• Input Voltage: 4.5 V
• Output Voltage: 5 V
• Output Current: 600 mA
• For Use With: MAX1776

The MAX1776 EV kit is a fully assembled and tested
surface-mount board. Follow the steps below to verify
board operation. Do not turn on the power supply
until all connections are completed.
1) Verify that shunts are across pins 1 and 2 of jumper
2) Connect a voltmeter and load (if any) to the VOUT
3) Connect a +5.5V to +24V power supply to the VIN
4) Turn on the power supply, and verify that the output
To evaluate other output voltages, refer to Evaluating
Other Output Voltages
The MAX1776 EV kit features a shutdown mode that
reduces quiescent current to 3µA (typ) to preserve bat-
tery life. Jumper (JU1) options select the circuit operat-
ing modes: shutdown or normal mode (Table 1).
The MAX1776 EV kit can operate at different current
limits after modification. Jumper (JU2 and JU3) options
select the MAX1776 internal switch current limit. The EV
MAX1776 Evaluation Kit
2
Table 1. Jumper JU1 Functions
LOCATION
JU1 (SHDN) and pins 1 and 2 of jumper JU4.
pad. Connect the ground to the GND pad closest to
VOUT.
pad. Connect the power-supply ground to the GND
pad closest to VIN.
voltage is +5.0V.
_______________________________________________________________________________________
SHUNT
1 and 2
2 and 3
None
Connected to VIN
Connect external
source to SHDN
pad
Connected to GND
Shutdown Jumper Selection
SHDN
PIN
Detailed Description
Adjustable Current Limit
MAX1776 enabled,
V
Shutdown mode,
V
MAX1776 output
depends on external
SHDN signal
Quick Start
OUT
OUT
MAX1776
OUTPUT
= +5.0V
= 0V
kit’s default setting provides the maximum 1.2A switch
current limit. To change the switch current limit, cut
open the PC board traces, shorting pins 1 and 2 of JU2
and JU3, and short the appropriate pins for the desired
current limit (Table 2). Changing the current limit
requires inductor L1 and output capacitor C2 to be
replaced. Refer to the Recommended Components
Table (Table 3) of the MAX1776 data sheet.
The default output for the MAX1776 EV kit is +5.0V. To
generate output voltages other than +5.0V, set the JU4
shunt to pins 2 and 3 (Table 3), cut the PC board trace
shorting the pads of R2, and install feedback resistors
R1 and R2. Select feedback resistor R2 in the 10kΩ to
100kΩ range.
Table 2. Jumper JU2 and JU3 Functions
*Default configuration: JU2 (1-2), JU3 (1-2) shorted by PC board
trace.
Table 3. Jumper JU4 Functions
Note: Do not switch JU4 shunt location or leave JU4 floating (no
shunt across JU4) when power is on.
LOCATION
JU2 SHUNT
LOCATION
SHUNT
1 and 2
2 and 3
1 and 2*
2 and 3
1 and 2
2 and 3
Evaluating Other Output Voltages
R1 = R2 [(V
Connected to OUT
Connected to a
voltage-divider
CONNECTION
JU3 SHUNT
LOCATION
1 and 2*
2 and 3
2 and 3
1 and 2
JUMPER
OUT
/ 1.25V) - 1]
CURRENT LIMIT (A)
MAX1776 SWITCH
Fixed output,
V
Adjustable output
OUT
MAX1776
= +5.0V
OUTPUT
0.15
0.30
0.60
1.20