FEATURES
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LTC3588-2
Nanopower Energy
Harvesting Power Supply
with 14V Minimum V
IN
DESCRIPTION
The
LTC
®
3588-2
integrates a low-loss full-wave bridge
rectifier with a high efficiency buck converter to form a
complete energy harvesting solution optimized for high
output impedance energy sources such as piezoelectric,
solar, or magnetic transducers.
An ultralow quiescent current undervoltage lockout (UVLO)
mode with a 16V rising threshold enables efficient energy
extraction from sources with high open circuit voltages.
This energy is transferred from the input capacitor to the
output via a high efficiency synchronous buck regulator.
The 16V UVLO threshold also allows for input to output
current multiplication through the buck regulator. The
buck features a sleep state that minimizes both input and
output quiescent currents while in regulation.
Four output voltages of 3.45V, 4.1V, 4.5V and 5.0V are
pin selectable with up to 100mA of continuous output
current, and suit Li-Ion and LiFePO
4
batteries as well as
supercapacitors. An input protective shunt set at 20V
provides overvoltage protection.
L,
LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
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1500nA Input Quiescent Current (Output in
Regulation – No Load, V
IN
= 18V)
830nA Input Quiescent Current in UVLO, V
IN
= 12V
14V to 20V Input Operating Range
Integrated Low-Loss Full-Wave Bridge Rectifier
16V UVLO Improves Power Utilization from High
Voltage Current Limited Inputs
Up to 100mA of Output Current
High Efficiency Integrated Hysteretic Buck DC/DC
Selectable Output Voltages: 3.45V, 4.1V, 4.5V, 5.0V
Input Protective Shunt – Up to 25mA Pull-Down at
V
IN
≥ 20V
Available in 10-Lead MSE and 3mm
×
3mm DFN
Packages
APPLICATIONS
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Piezoelectric Energy Harvesting
Electro-Mechanical Energy Harvesting
Low Power Battery Charging
Wireless HVAC Sensors
Mobile Asset Tracking
Tire Pressure Sensors
Battery Replacement for Industrial Sensors
TYPICAL APPLICATION
High Voltage Piezoelectric Energy Harvesting Power Supply
LTC3588-2 5.0V Regulator Start-Up Profile
20
C
IN
= 10µF C
STORAGE
= 47µF
,
18 NO LOAD, I
VIN
= 2µA
MIDE V25W
VOLTAGE (V)
PZ1
1µF
6V
10µF
25V
4.7µF
6V
V
IN
CAP
V
IN2
GND
35882 TA01
V
IN
16
PZ2
22µH
V
OUT
C
STORAGE
6V
2
OUTPUT
VOLTAGE
SELECT
14
12
10
8
6
4
2
0
0
200
TIME (sec)
35882 TA01b
LTC3588-2
SW
V
OUT
PGOOD
D0, D1
V
OUT
PGOOD = LOGIC 1
400
600
35882fc
For more information
www.linear.com/LTC3588-2
1
LTC3588-2
ABSOLUTE MAXIMUM RATINGS
(Note 1)
V
IN
Low Impedance Source ....................... –0.3V to 18V*
Current Fed, I
SW
= 0A ...................................... 25mA
†
PZ1, PZ2 ...........................................................0V to V
IN
D0, D1 ..............–0.3V to [Lesser of (V
IN2
+ 0.3V) or 6V]
CAP ...................... [Higher of –0.3V or (V
IN
– 6V)] to V
IN
V
IN2
................... –0.3V to [Lesser of (V
IN
+ 0.3V) or 6V]
* V
IN
has an internal 20V clamp
†
For t < 1ms and Duty Cycle < 1%,
Absolute Maximum Continuous Current = 5mA
V
OUT
.................. –0.3V to [Lesser of (V
IN
+ 0.3V) or 6V]
PGOOD............–0.3V to [Lesser of (V
OUT
+ 0.3V) or 6V]
I
PZ1
, I
PZ2
............................................................. ±50mA
I
SW
...................................................................... 350mA
Operating Junction Temperature Range
(Notes 2, 3) ................................................ –40 to 125°C
Storage Temperature Range ...................... –65 to 125°C
Lead Temperature (Soldering, 10 sec)
MSE Only .......................................................... 300°C
PIN CONFIGURATION
TOP VIEW
PZ1
PZ2
CAP
V
IN
SW
1
2
3
4
5
11
GND
10 PGOOD
9 D0
8 D1
7 V
IN2
6 V
OUT
TOP VIEW
PZ1
PZ2
CAP
V
IN
SW
1
2
3
4
5
11
GND
10
9
8
7
6
PGOOD
D0
D1
V
IN2
V
OUT
DD PACKAGE
10-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W,
θ
JC
= 7.5°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
MSE PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 45°C/W,
θ
JC
= 10°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC3588EDD-2#PBF
LTC3588IDD-2#PBF
LTC3588EMSE-2#PBF
LTC3588IMSE-2#PBF
TAPE AND REEL
LTC3588EDD-2#TRPBF
LTC3588IDD-2#TRPBF
LTC3588EMSE-2#TRPBF
LTC3588IMSE-2#TRPBF
PART MARKING*
LFYK
LFYK
LTFYM
LTFYM
PACKAGE DESCRIPTION
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead Plastic MSOP
10-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–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/
This product is only offered in trays. For more information go to:
http://www.linear.com/packaging/
2
35882fc
For more information
www.linear.com/LTC3588-2
LTC3588-2
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN
I
Q
PARAMETER
Input Voltage Range
V
IN
Quiescent Current
UVLO
Buck Enabled, Sleeping
Buck Enabled, Not Sleeping
V
IN
Undervoltage Lockout Threshold
V
IN
Shunt Regulator Voltage
Maximum Protective Shunt Current
Internal Bridge Rectifier Loss
(|V
PZ1
– V
PZ2
| – V
IN
)
Internal Bridge Rectifier Reverse
Leakage Current
Internal Bridge Rectifier Reverse
Breakdown Voltage
V
OUT
Regulated Output Voltage
The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are for T
A
= 25°C (Note 2). V
IN
= 18V unless otherwise specified.
CONDITIONS
Low Impedance Source on V
IN
V
IN
= 12V, Not PGOOD
V
IN
= 18V
I
SW
= 0A (Note 4)
V
IN
Rising
V
IN
Falling
V
SHUNT
I
SHUNT
I
VIN
= 1mA
1ms Duration
I
BRIDGE
= 10µA
V
REVERSE
= 18V
I
REVERSE
= 1µA
3.45V Output Selected
Sleep Threshold
Wake-Up Threshold
4.1V Output Selected
Sleep Threshold
Wake-Up Threshold
4.5V Output Selected
Sleep Threshold
Wake-Up Threshold
5.0V Output Selected
Sleep Threshold
Wake-Up Threshold
As a Percentage of the Selected V
OUT
V
OUT
= 5.0V
200
100
1.1
1.3
l
l
l
l
l
l
MIN
TYP
MAX
18.0
UNITS
V
nA
nA
µA
V
V
V
mA
mV
nA
V
830
1500
150
16.0
13.0
18.8
25
350
400
14.0
20.0
1400
2500
250
17.0
21.2
450
20
V
UVLO
V
SHUNT
30
l
l
l
l
l
l
l
l
3.346
3.979
4.354
4.825
83
3.466
3.434
4.116
4.084
4.516
4.484
5.016
4.984
92
125
260
3.554
4.221
4.646
5.175
V
V
V
V
V
V
V
V
%
nA
mA
mA
Ω
Ω
%
V
PGOOD Falling Threshold
I
VOUT
I
PEAK
I
BUCK
R
P
R
N
V
IH(D0, D1)
V
IL(D0, D1)
I
IH(D0, D1)
I
IL(D0, D1)
Output Quiescent Current
Buck Peak Switch Current
Available Buck Output Current
Buck PMOS Switch On-Resistance
Buck NMOS Switch On-Resistance
Max Buck Duty Cycle
D0/D1 Input High Voltage
D0/D1 Input Low Voltage
D0/D1 Input High Current
D0/D1 Input Low Current
250
350
100
1.2
0.4
10
10
V
nA
nA
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 LTC3588E-2 is tested under pulsed load conditions such
that T
J
≈ T
A
. The LTC3588E-2 is guaranteed to meet specifications
from 0°C to 85°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3588I-2 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:
The junction temperature (T
J
, in °C) is calculated from the ambient
temperature (T
A
, in °C) and power dissipation (P
D
, in Watts) according
to the formula: T
J
= T
A
+ (P
D
•
θ
JA
), where
θ
JA
(in °C/W) is the package
thermal impedance.
Note 4:
Dynamic supply current is higher due to gate charge being
delivered at the switching frequency.
35882fc
For more information
www.linear.com/LTC3588-2
3
LTC3588-2
TYPICAL PERFORMANCE CHARACTERISTICS
1800
1600
1400
INPUT I
Q
(nA)
INPUT I
Q
(nA)
1200
1000
800
600
400
200
0
0
2
4
6
8
10
V
IN
(V)
12
14
16
85°C
25°C
–40°C
Input I
Q
in UVLO vs V
IN
125°C
3600
3200
2800
2400
2000
1600
1200
800
Input I
Q
in Sleep vs V
IN
125°C
UVLO Rising vs Temperature
16.4
16.2
UVLO RISING (V)
85°C
25°C
–40°C
14
15
16
V
IN
(V)
17
18
35882 G02
16.0
15.8
15.6
–50
–25
0
25
75
50
TEMPERATURE (°C)
100
125
35882 G01
35882 G03
UVLO Falling vs Temperature
14.4
21.2
21.0
20.8
14.2
UVLO FALLING (V)
V
SHUNT
(V)
20.6
20.2
20.0
19.8
19.6
13.8
19.4
19.2
19.0
13.6
–50
–25
0
25
75
50
TEMPERATURE (°C)
100
125
20.4
V
SHUNT
vs Temperature
Total Bridge Rectifier Drop
vs Bridge Current
1800
1600
1400
V
BRIDGE
(mV)
1200
1000
800
600
400
200
85°C
25°C
|V
PZ1
– V
PZ2
| – V
IN
–40°C
I
SHUNT
= 25mA
I
SHUNT
= 1mA
14.0
18.8
–50
–25
35882 G04
0
25
75
50
TEMPERATURE (°C)
100
125
0
1µ
10µ
100µ
1m
BRIDGE CURRENT (A)
10m
35882 G06
35882 G05
Bridge Leakage vs Temperature
20
18
16
BRIDGE LEAKAGE (nA)
14
V
IN
(V)
12
10
8
6
4
2
0
–55
–10
35
80
125
TEMPERATURE (°C)
170
35882 G07
Bridge Frequency Response
2.0
4V
P-P
APPLIED TO PZ1/PZ2 INPUT
1.8
MEASURED IN UVLO
1.6
1.4
V
OUT
(V)
1.2
1.0
0.8
0.6
0.4
0.2
0
10
100
1k
10k 100k 1M
FREQUENCY (Hz)
10M 100M
35882 G08
3.45V Output vs Temperature
3.55
3.50
3.45
3.40
3.35
3.30
3.25
3.20
3.15
3.10
–50
–25
0
25
75
50
TEMPERATURE (°C)
100
125
PGOOD FALLING
WAKE-UP THRESHOLD
SLEEP THRESHOLD
V
IN
= 18V, LEAKAGE AT PZ1 OR PZ2
35882 G09
4
35882fc
For more information
www.linear.com/LTC3588-2
LTC3588-2
TYPICAL PERFORMANCE CHARACTERISTICS
4.1V Output vs Temperature
4.20
SLEEP THRESHOLD
4.10
WAKE-UP THRESHOLD
V
OUT
(V)
V
OUT
(V)
4.00
4.40
4.50
WAKE-UP THRESHOLD
V
OUT
(V)
4.60
SLEEP THRESHOLD
4.5V Output vs Temperature
5.10
5.00
5.0V Output vs Temperature
SLEEP THRESHOLD
WAKE-UP THRESHOLD
4.90
4.80
4.70
3.90
4.30
3.80
PGOOD FALLING
4.20
PGOOD FALLING
100
125
4.10
–50
–25
0
25
75
50
TEMPERATURE (°C)
100
125
4.60
4.50
–50
PGOOD FALLING
3.70
–50
–25
0
25
75
50
TEMPERATURE (°C)
–25
35882 G10
50
0
25
75
TEMPERATURE (°C)
100
125
35882 G11
35882 G12
V
OUT
Load Regulation
4.20
V
IN
= 18V, C
OUT
= 100µF D1 = 0, D0 = 1
,
4.15
V
OUT
Line Regulation
C
OUT
= 100µF I
LOAD
= 60mA,
,
4.14 D1 = 0, D0 = 1
4.13
4.12
I
VOUT
(nA)
V
OUT
(V)
4.11
4.10
4.09
4.08
4.07
4.06
160
140
120
100
80
I
VOUT
vs Temperature
V
OUT
= 5.0V
V
OUT
= 4.5V
4.15
V
OUT
(V)
4.10
V
OUT
= 3.45V
V
OUT
= 4.1V
4.05
60
40
–50
4.00
1µ
10µ
100µ
1m
10m
LOAD CURRENT (A)
100m
35882 G13
4.05
14
15
16
V
IN
(V)
17
18
35882 G14
–25
0
75
25
50
TEMPERATURE (°C)
100
125
35882 G15
300
290
280
270
I
PEAK
vs Temperature
R
DS(ON)
of PMOS/NMOS
vs Temperature
2.0
1.8
1.6
R
DS(ON)
(Ω)
1.4
PMOS
1.2
1.0
0.8
–55 –35 –15
NMOS
OUTPUT
VOLTAGE
50mV/DIV
AC-COUPLED
SWITCH
VOLTAGE
10V/DIV
0V
INDUCTOR
CURRENT
200mA/DIV
0mA
5 25 45 65 85 105 125
TEMPERATURE (°C)
35882 G17
Operating Waveforms
I
PEAK
(mA)
260
250
240
230
220
210
200
–50
–25
0
75
25
50
TEMPERATURE (°C)
100
125
35882 G16
2.5µs/DIV
V
IN
= 18V, V
OUT
= 5.0V
I
LOAD
= 1mA
L = 22µH, C
OUT
= 47µF
35882 G18
35882fc
For more information
www.linear.com/LTC3588-2
5
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