LTC3330_15 Datasheet, PDF (1/32 Pages) Linear Technology – Nanopower Buck-Boost DC/DC with Energy Harvesting Battery Life Extender

LTC3330
FEATURES
Nanopower Buck-Boost
DC/DC with Energy Harvesting
Battery Life Extender
DESCRIPTION
n _{Dual Input, Single Output DC/DCs with Input}
Prioritizer
Energy Harvesting Input: 3.0V to 19V Buck DC/DC
Primary Cell Input: 1.8V to 5.5V Buck-Boost DC/DC
n _{Zero Battery IQ When Energy Harvesting Source is}
Available
n _{Ultralow Quiescent Current: 750nA at No-Load}
n _{Low Noise LDO Post Regulator}
n _{Integrated Supercapacitor Balancer}
n _{Up to 50mA of Output Current}
n _{Programmable DC/DC and LDO Output Voltages,}
Buck UVLO, and Buck-Boost Peak Input Current
n _{Integrated Low Loss Full-Wave Bridge Rectifier}
n _{Input Protective Shunt: Up to 25mA at VIN ≥ 20V}
n _{5mm × 5mm QFN-32 Package}
APPLICATIONS
n _{Energy Harvesting}
n _{Solar Powered Systems with Primary Cell Backup}
n _{Wireless HVAC Sensors and Security Devices}
n _{Mobile Asset Tracking}
The LTC^®3330 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 sup-
ply, consisting of an integrated full-wave bridge rectifier
and a high voltage buck converter, harvests energy from
piezoelectric, solar, or magnetic sources. The primary cell
input powers a buck-boost converter capable of opera-
tion 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 draw on the battery to essentially zero, thereby
extending the life of the battery. The buck-boost powers
V_OUT only 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 set-
tings for both inputs and outputs are programmable via
pin-strapped logic inputs. The LTC3330 is available in a
5mm × 5mm QFN-32 package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
TYPICAL APPLICATION
+
3V TO 19V
SOLAR
PANEL
–
22µF
25V
4.7µF, 6.3V
AC1
V_IN
1µF
6.3V
CAP
V_IN2
AC2
SW
LTC3330
SWA
SWB
V_OUT
LDO_IN
+ ^PRIMARY
CELL
1.8V TO 5.5V
4.7µF
6.3V
3
3
3
4
BAT
OUT[2:0]
LDO[2:0]
IPK[2:0]
UV[3:0]
SCAP
BAL
EH_ON
PGVOUT
PGLDO
LDO_EN
LDO_OUT
GND
V_IN3
22µH
22µH
PIEZO
MIDE
V25W
10mF
2.7V
10mF
2.7V
OPTIONAL
1.8V TO 5V
50mA
47µF
6.3V
1µF
6.3V
1.2V TO 3.3V
50mA
22µF
6.3V
3330 TA01a
For more information www.linear.com/LTC3330
Extended Battery Life with
Energy Harvesting
V_OUT
50mV/DIV
AC-COUPLED
EH_ON
2V/DIV
0V
IBAT
100mA/DIV
0A
BAT = 3.6V
V_OUT = 1.8V
I_LOAD = 50mA
ACTIVE ENERGY
HARVESTER
REDUCES BATTERY
CURRENT TO ZERO
200µs/DIV
3330 TA01b
3330fb
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