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FEATURES
LTC3330
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
VOUT 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
VIN
1µF
6.3V
CAP
VIN2
AC2
SW
LTC3330
SWA
SWB
VOUT
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 VIN3
22µH
22µH
PIEZO
MIDE
V25W
10mF
2.7V
10mF
2.7V
OPTIONAL
1.8V TO 5V
50mA
47µF
6.3V
1.2V TO 3.3V
50mA
1µF 22µF
6.3V 6.3V
OUTPUT VOLTAGE
50mV/DIV
AC-COUPLED
Extended Battery Life with
Energy Harvesting
EH_ON
2V/DIV
0V
IBAT
100mA/DIV
0A
BAT = 3.6V
VOUT = 1.8V
ILOAD = 50mA
ACTIVE ENERGY
HARVESTER
REDUCES BATTERY
CURRENT TO ZERO
200µs/DIV
3330 TA01b
3330 TA01a
For more information www.linear.com/LTC3330
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LTC3330
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN
Low Impedance Source...........................–0.3 to 19V*
Current-Fed, ISW = 0A.........................................25mA
AC1, AC2..............................................................0 to VIN
BAT, VOUT, VIN3, LDO_IN, SCAP, PGVOUT,
PGLDO, LDO_EN..............................................–0.3 to 6V
VIN2.....................–0.3V to [Lesser of (VIN + 0.3V) or 6V]
CAP....................... [Higher of –0.3V or (VIN – 6V)] to VIN
LDO_OUT, LDO[2:0]..................–0.3V to LDO_IN + 0.3V
BAL................................................–0.3V to SCAP + 0.3V
OUT[2:0], IPK[2:0],
EH_ON..............–0.3V to [Lesser of (VIN3 + 0.3V) or 6V]
UV[3:0]............. –0.3V to [Lesser of (VIN2 + 0.3V) or 6V]
IAC1, IAC2...............................................................±50mA
ISW, ISWA, ISWB, IVOUT...........................................350mA
ILDO_OUT..................................................................50mA
Operating Junction Temperature Range
(Notes 2, 3)............................................. –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
*VIN has an internal 20V clamp
PIN CONFIGURATION
TOP VIEW
32 31 30 29 28 27 26 25
BAL 1
24 LDO0
SCAP 2
23 LDO1
VIN2 3
UV3 4
UV2 5
22 LDO2
33 21 LDO_IN
GND 20 LDO_OUT
UV1 6
UV0 7
19 IPK2
18 IPK1
AC1 8
17 IPK0
9 10 11 12 13 14 15 16
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 44°C/W
EXPOSED PAD (PIN 33) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3330EUH#PBF
LTC3330EUH#TRPBF
3330
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LTC3330IUH#PBF
LTC3330IUH#TRPBF
3330
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
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LTC3330
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature
otherwise specified.
range,
otherwise
specifications
are
at
TA
=
25°C
(Note
2).
VIN
=
5V,
BAT
=
3.6V,
SCAP
=
OV,
LDO_IN
=
0V
unless
SYMBOL
VIN
VBAT
IVIN
IBAT
IVOUT
VINUVLO
VSHUNT
ISHUNT
PARAMETER
CONDITIONS
Buck Input Voltage Range
Buck-Boost Input Voltage Range
V IN
Quiescent Current
VVBIIuNNckIInnEppnuuattbiinnleUUd,VVSLLlOOeeping
Buck Enabled, Sleeping
Buck Enabled, Not Sleeping
BAT Quiescent Current
BBAucTkI-nBpouotswt iEthnaVbIlNedA,cStilveeeping
Buck-Boost Enabled, Not Sleeping
VVVVVIIIIINNNNN
=
=
=
=
=
2.5V, BAT = 0V
16V, BAT = 0V
4V, BAT = 0V
18V, BAT = 0V
5V, BAT = 0V, ISW1
=
0A
(Note
4)
(BBBNAAAoTTTte===4515)V.V8,,VVV,IINVNI==N
= 5V
0V
0V, ISWA
=
ISWB
=
0A
VOUT Leakage Current
V(RINisUinngdoerrvFoalltlaingge)Lockout Thresholds
VOUT = 5.0V, OUT[2:0] = 111, Sleeping
3V Level
4V Level
5V Level
6V Level
7V Level
8V Level
9V Level
10V Level
11V Level
12V Level
13V Level
14V Level
15V Level
16V Level
17V Level
18V Level
VIN Shunt Regulator Voltage
Maximum Protective Shunt Current
IVIN = 1mA
Internal Bridge Rectifier Loss (|VAC1 – VAC2| – VIN) IBRIDGE = 10µA
IBRIDGE = 50mA
Internal Bridge Rectifier Reverse Leakage Current VREVERSE = 18V
Internal Bridge Rectifier Reverse Breakdown
Voltage
IREVERSE = 1µA
MIN
l
l 1.8
–10
l 2.91
l 3.88
l 4.85
l 5.82
l 6.79
l 7.76
l 8.73
l 9.70
l 10.67
l 11.64
l 12.61
l 13.58
l 14.55
l 15.52
l 16.49
l 17.46
l 19.0
25
700
1350
TYP
450
840
1200
1800
150
0
750
200
100
3.00
4.00
5.00
6.00
7.00
8.00
9.00
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
20.0
800
1550
VSHUNT
30
MAX
19
5.5
700
1400
1800
2500
225
10
1200
300
150
3.09
4.12
5.15
6.18
7.21
8.24
9.27
10.30
11.33
12.36
13.39
14.42
15.45
16.48
17.51
18.54
21.0
900
1750
20
UNITS
V
V
nA
nA
nA
nA
µA
nA
nA
µA
nA
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
mA
mV
mV
nA
V
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LTC3330
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature
otherwise specified.
range,
otherwise
specifications
are
at
TA
=
25°C
(Note
2).
VIN
=
5V,
BAT
=
3.6V,
SCAP
=
OV,
LDO_IN
=
0V
unless
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VOUT
Regulated Buck/Buck-Boost Output Voltage
1.8V Output Selected
Sleep Threshold
Wake-Up Threshold
l
l 1.728
1.806
1.794
1.872
V
V
2.5V Output Selected
Sleep Threshold
Wake-Up Threshold
l
l 2.425
2.508
2.492
2.575
V
V
2.8V Output Selected
Sleep Threshold
Wake-Up Threshold
l
l 2.716
2.809
2.791
2.884
V
V
3.0V Output Selected
Sleep Threshold
Wake-Up Threshold
l
l 2.910
3.010
2.990
3.090
V
V
3.3V Output Selected
Sleep Threshold
Wake-Up Threshold
l
l 3.200
3.311
3.289
3.400
V
V
3.6V Output Selected
Sleep Threshold
Wake-Up Threshold
l
l 3.492
3.612
3.588
3.708
V
V
4.5V Output Selected
Sleep Threshold
Wake-Up Threshold
l
l 4.365
4.515
4.485
4.635
V
V
5.0V Output Selected
Sleep Threshold
Wake-Up Threshold
l
l 4.850
5.017
4.983
5.150
V
V
IPEAK_BUCK
IBUCK
IPEAK_BB
PGVOUT Falling Threshold
Buck Peak Switch Current
Available Buck Output Current
Buck-Boost Peak Switch Current
As a Percentage of VOUT Target (Note 5) l 88 92 96
200 250 350
100
250mA Target Selected
200 250 350
150mA Target Selected
120 150 210
%
mA
mA
mA
mA
100mA Target Selected
80 100 140
mA
50mA Target Selected
40 50 70
mA
25mA Target Selected
20 25 35
mA
15mA Target Selected
12 15 21
mA
10mA Target Selected
8 10 14
mA
5mA Target Selected
457
mA
IBB
RP_BUCK
RN_BUCK
RP_BB
Available Buck-Boost Current
Buck PMOS Switch On-Resistance
Buck NMOS Switch On-Resistance
Buck-Boost PMOS Input and Output Switch
On-Resistance
IVPOEUATK_=BB3.=3V250mA, BAT = 1.8V,
IPK[2:0] = 111
IPK[2:0] = 110
IPK[2:0] = 101
IPK[2:0] = 100
IPK[2:0] = 011
IPK[2:0] = 010
IPK[2:0] = 001
IPK[2:0] = 000
50
1.4
1.2
0.7
0.9
1.2
2.1
3.9
6.3
9.2
17.7
mA
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
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LTC3330
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature
otherwise specified.
range,
otherwise
specifications
are
at
TA
=
25°C
(Note
2).
VIN
=
5V,
BAT
=
3.6V,
SCAP
=
OV,
LDO_IN
=
0V
unless
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
RN_BB
Buck-Boost NMOS Input and Output Switch
On-Resistance
IPK2 = 1
IPK2 = 0
0.6 Ω
3.8 Ω
ILEAK(P)
ILEAK(N)
PMOS Switch Leakage
NMOS Switch Leakage
Maximum Buck Duty Cycle
Buck/Buck-Boost Regulators
Buck/Buck-Boost Regulators
Buck/Buck-Boost Regulators
–20
–20
l 100
20 nA
20 nA
%
VLDO_IN
ILDO_IN
ILDO_OUT
LDO_OUT
LDO_IN Input Range
LDO_IN Quiescent Current
LDO_OUT Leakage Current
Regulated LDO Output Voltage
l 1.8V
5.5V
LDO_IN = 5.0V, ILDO_OUT = 0mA
LDO_OUT = 3.3V, LDO[2:0] = 110
400 600
100 150
Error as a Percentage of Target, 100µA
Load
–2.0
l –3.0
2.0
3.0
V
nA
nA
%
%
LDO Line Regulation (1.8V to 5.5V)
LDO_OUT = 1.2V, 10mA Load
2 mV/V
LDO Load Regulation (10µA to 10mA)
LDO_IN = 5.0V, LDO_OUT = 3.3V
0.5 mV/mA
LDO Dropout Voltage
LDO_OUT = 3.3V, 10mA LOAD
50 mV
RP_LDO
LDO PMOS Switch On-Resistance
LDO Current Limit
LDO_IN = 3.3V, ILDO_OUT = 10mA
LDO_IN = 5.0V
5
50
Ω
mA
PGLDO Rising Threshold
As a Percentage of the 3.3V LDO_OUT
l 88
92
96
Target
%
PGLDO Falling Threshold
As a Percentage of the 3.3V LDO_OUT
l 86
90
94
Target
%
VSCAP
ISCAP
ISOURCE
ISINK
VBAL
VIH
Supercapacitor Balancer Input Range
Supercapacitor Balancer Quiescent Current
Supercapacitor Balancer Source Current
Supercapacitor Balancer Sink Current
Supercapacitor Balance Point
Digital Input High Voltage
SCAP = 5.0V
SCAP = 5.0V, BAL = 2.4V
SCAP = 5.0V, BAL = 2.6V
Percentage of SCAP Voltage
Pins LDO_EN, OUT[2:0], LDO[2:0],
IPK[2:0], UV[3:0]
l 2.5
5.5
150 225
10
10
l 49 50 51
l 1.2
V
nA
mA
mA
%
V
VIL Digital Input Low Voltage
Pins LDO_EN, OUT[2:0], LDO[2:0],
IPK[2:0], UV[3:0]
l
0.4 V
IIH Digital Input High Current
Pins LDO_EN, OUT[2:0], LDO[2:0],
IPK[2:0], UV[3:0]
0 10
nA
IIL Digital Input Low Current
Pins LDO_EN, OUT[2:0], LDO[2:0],
IPK[2:0], UV[3:0]
0 10
nA
VOH PGVOUT, PGLDO Output High Voltage
EH_ON Output High Voltage
BAT = 5V, 1µA Out of Pin
VIN = 6V, 1µA Out of Pin
VOL PGVOUT, PGLDO, EH_ON Output Low Voltage BAT = 5V, 1µA into Pin
l 4.0
l 3.8
l
V
V
0.4 V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3330E is tested under pulsed load conditions such that
TJ ≈ TA. The LTC3330E is guaranteed to meet specifications from 0°C to
85°C. The LTC3330I is guaranteed over the –40°C to 125°C operating
junction temperature range. Note that the maximum ambient temperature
consistent with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
impedance and other environmental factors.
Note 3: TJ is calculated from the ambient TA and power dissipation PD
according to the following formula: TJ = TA + (PD θJA).
Note 4: Dynamic supply current is higher due to gate charge being
delivered at the switching frequency.
Note 5: The PGVOUT Rising threshold is equal to the sleep threshold. See
VOUT specification.
For more information www.linear.com/LTC3330
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