QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1177
DUAL BUCK-BOOST/ BUCK SYNCHRONOUS CONVERTERS
1
LTC3522
DESCRIPTION
Demonstration circuit DC1177 is a micropower dual
Buck-Boost/Buck synchronous converter based on the
LTC3522 monolithic regulator. The DC1177 has an input
voltage range of 2.4V to 4.2V and outputs 3.3V @
300mA and 1.8V @ 200mA. The converters can be set
for Fixed Frequency (PWM) or Burst Node, providing
high conversion efficiency over a wide range of load cur-
rents. The LTC3522 comes in a 16 lead 3×3 QFN pack-
age. These features make the DC1177 demo board an
ideal circuit for use in Li-Ion battery-powered, hand-held
applications such as PDAs, MP3 Players, and Personal
Navigation Devices.
Design files for this circuit board are available. Call
the LTC factory.
QUICK START PROCEDURE
Refer to Figure 1 for proper measurement equipment
setup and follow the procedure below:
1.
Set Load1 between 0A
400mA and Load2 between
0A
200mA.
2.
Set the Power Supply to ~ 3.6Vin
3.
VIN can be adjusted between 2.4V and 4.2V (note:
max output current for VOUT1 is lower than 400mA at
VIN below 3.0V).
Figure 1.
Proper Measurement Equipment Setup
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1177
DUAL BUCK-BOOST/ BUCK SYNCHRONOUS CONVERTERS
2
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1177
DUAL BUCK-BOOST/ BUCK SYNCHRONOUS CONVERTERS
3
