1
dc2048af
DEMO MANUAL DC2048A
Description
LTC3330EUH
Nanopower Buck-Boost DC/DC with
Energy Harvesting Battery Life Extender
Demonstration Circuit 2048A is a nanopower buck-
boost DC/DC with energy harvesting battery life extender
featuring the
. The LTC3330 integrates a high
voltage energy harvesting power supply plus a DC/DC
converter powered by a primary cell battery to create a
single output supply for alternative energy applications.
The energy harvesting power supply, consisting of an
integrated low-loss full-wave bridge with a high voltage
buck converter, harvests energy from piezoelectric, solar
or magnetic sources. The primary cell input powers a
buck-boost converter capable of operating down to 1.8V
at its input. Either DC/DC converter can deliver energy to
a single output. The buck operates when harvested energy
is available, reducing the quiescent current drawn on the
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Dust
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
BoarD photo
battery to essentially zero. The buck-boost takes over
when harvested energy goes away.
A low noise LDO post regulator and a supercapacitor
balancer are also integrated, accommodating a wide range
of output storage configurations.
Voltage and current settings for both input and outputs
are programmable via pin-strapped logic inputs.
The LTC3330EUH is available in a 5mm × 5mm 32-lead
QFN surface mount package with exposed pad.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2048A
Figure 1. DC2048A Demo Board
Figure 2. Typical Efficiency of DC2048A.
Buck Efficiency vs I
LOAD
I
LOAD
(A)
EFFICIENCY (%)
DC2048A F02
100
90
60
80
70
40
50
20
10
30
0
1µ
10µ
10m
100m
1m
100µ
V
OUT
= 1.8V
V
OUT
= 2.5V
V
OUT
= 3.3V
V
OUT
= 5V
V
IN
= 6V, L = 22µH, DCR = 0.19Ω
