Linear DC938 User manual

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 938
MICROPOWER SYNCHRONOUS BUCK-BOOST DC/DC CONVERTER
1
LTC3530
DESCRIPTION
Demonstration circuit 938 is a micropower synchro-
nous buck-boost converter based on the LTC3530
monolithic buck-boost regulator. The DC938 has an
input voltage range of 1.8 V to 5.5V and an output of
3.3V @ 500mA. The converter can work under man-
ual or programmable automatic burst mode, provid-
ing high conversion efficiency over a wide range of
load currents. The LTC3530 comes in a 10 lead 3×3
DFN package. These features make the DC938 demo
board an ideal circuit for use in Li-Ion and dual cell
AA (Alkaline/NiCad/NiMH) battery-powered, hand-
held applications.
Design files for this circuit board are available. Call
the LTC factory.
LTC is a trademark of Linear Technology Corporation
QUICK START PROCEDURE
Refer to Figure 1 for proper measurement equipment
setup and follow the procedure below:
1. Start with Load set to 0A.
2. Set Power Supply to ~ 3Vin
3. The Load can be set from 0 – 500mA.
4. Vin can be adjusted between 1.8V and 5.5V (note
however, max output current is lower than 500mA
at Vin below 2.2V).
Figure 1. Proper Measurement Equipment Setup

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 938
MICROPOWER SYNCHRONOUS BUCK-BOOST DC/DC CONVERTER
2

Mouser Electronics
Authorized Distributor
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Analog Devices Inc.:
DC938A