LTC3330 Datasheet, PDF (1/20 Pages) Linear Technology – Energy Harvesting DC/DC with Battery Backup Low Noise LDO Post Regulator

Electrical Specifications Subject to Change
LTC3330
Energy Harvesting DC/DC
with Battery Backup
Features
n _{Dual Input, Single Output DC/DC’s with Input}
Prioritizer
Energy Harvesting Input: 3.0V to 18V Buck DC/DC
Primary Cell Input: 1.8V to 5.5V Buck-Boost DC/DC
n _{Zero Battery IQ When Powering Load from}
Harvested Energy
n _{Ultralow Quiescent Current: 900nA 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}
Description
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 supply,
consisting of an integrated full-wave bridge rectifier and a
high voltage buck converter, harvests energy from piezo-
electric, solar, or magnetic sources. The primary cell input
powers a buck-boost converter capable of operation down
to 1.8V at its input. Either DC/DC converter can deliver en-
ergy to a single output. The buck operates when harvested
energy is available, reducing the quiescent current draw
on the 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 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 of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Typical Application
4V TO 18V
+
SOLAR
PANEL
–
3V TO 18V
10µF
25V
4.7µF, 6V
AC1
V_IN
1µF
6V
CAP
V_IN2
AC2
SW
LTC3330
SWA
SWB
V_OUT
LDO_IN
+ ^PRIMARY
CELL
1.8V TO 5.5V
1µF
6V
3
3
3
4
BAT
OUT[2:0]
LDO[2:0]
IPK[2:0]
UV[3:0]
SCAP
BAL
LDO_EN
EH_ON
PGVOUT
PGLDO
LDO_OUT
GND
V_IN3
22µH
22µH
PIEZO
MIDE
V25W
10mF
2.5V
10mF
2.5V
OPTIONAL
1.2V TO 5V
50mA
22µF
6V
1.2V TO 3.6V
50mA
1µF
2.2µF
6V
6V
3330 TA01a
For more information www.linear.com/LTC3330
3330p
1