LTC3588-1
Nanopower Energy
Harvesting Power Supply
FEATURES
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DESCRIPTION
The
LTC
®
3588-1
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 wide
hysteresis window allows charge to accumulate on an input
capacitor until the buck converter can efficiently transfer a
portion of the stored charge to the output. In regulation,
the LTC3588-1 enters a sleep state in which both input and
output quiescent currents are minimal. The buck converter
turns on and off as needed to maintain regulation.
Four output voltages, 1.8V, 2.5V, 3.3V and 3.6V, are pin
selectable with up to 100mA of continuous output current;
however, the output capacitor may be sized to service a
higher output current burst. An input protective shunt set
at 20V enables greater energy storage for a given amount
of input capacitance.
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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950nA Input Quiescent Current (Output in
Regulation – No Load)
450nA Input Quiescent Current in UVLO
2.7V to 20V Input Operating Range
Integrated Low-Loss Full-Wave Bridge Rectifier
Up to 100mA of Output Current
Selectable Output Voltages of 1.8V, 2.5V, 3.3V, 3.6V
High Efficiency Integrated Hysteretic Buck DC/DC
Input Protective Shunt – Up to 25mA Pull-Down at
V
IN
≥ 20V
Wide Input Undervoltage Lockout (UVLO) Range
Available in 10-Lead MSE and 3mm × 3mm DFN
Packages
APPLICATIONS
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Piezoelectric Energy Harvesting
Electro-Mechanical Energy Harvesting
Wireless HVAC Sensors
Mobile Asset Tracking
Tire Pressure Sensors
Battery Replacement for Industrial Sensors
Remote Light Switches
Standalone Nanopower Buck Regulator
TYPICAL APPLICATION
100mA Piezoelectric Energy Harvesting Power Supply
LTC3588-1 3.3V Regulator Start-Up Profile
22
C
STORAGE
= 22µF C
OUT
= 47µF
,
20 NO LOAD, I
VIN
= 2µA
18
16
SW
V
OUT
2
OUTPUT
VOLTAGE
SELECT
47µF
6V
V
OUT
VOLTAGE (V)
PZ2
LTC3588-1
10µH
14
12
10
8
6
4
2
0
0
200
V
OUT
PGOOD = LOGIC 1
400
TIME (s)
600
35881 TA01b
MIDE V21BL
PZ1
1µF
6V
C
STORAGE
25V
4.7µF
6V
V
IN
CAP
V
IN2
GND
35881 TA01
V
IN
PGOOD
D0, D1
35881fc
For more information
www.linear.com/LTC3588-1
1
LTC3588-1
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
IN2
+ 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 150°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 eMSOP
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-1#PBF
LTC3588IDD-1#PBF
LTC3588EMSE-1#PBF
LTC3588IMSE-1#PBF
TAPE AND REEL
LTC3588EDD-1#TRPBF
LTC3588IDD-1#TRPBF
LTC3588EMSE-1#TRPBF
LTC3588IMSE-1#TRPBF
PART MARKING*
LFKY
LFKY
LTFKX
LTFKX
PACKAGE DESCRIPTION
10-Lead (3mm × 3mm) Plastic DFN
10-Lead (3mm × 3mm) Plastic DFN
10-Lead Plastic eMSOP
10-Lead Plastic eMSOP
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
35881fc
For more information
www.linear.com/LTC3588-1
LTC3588-1
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN
I
VIN
PARAMETER
Input Voltage Range
V
IN
Quiescent Current
UVLO
Buck Enabled, Sleeping
Buck Enabled, Sleeping
Buck Enabled, Not Sleeping
V
IN
Undervoltage Lockout Threshold
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
= 5.5V unless otherwise specified.
CONDITIONS
Low Impedance Source on V
IN
V
IN
= 2.5V, Not PGOOD
V
IN
= 4.5V
V
IN
= 18V
I
SW
= 0A (Note 4)
V
IN
Rising
1.8V Output Selected; D1 = 0, D0 = 0
2.5V Output Selected; D1 = 0, D0 = 1
3.3V Output Selected; D1 = 1, D0 = 0
3.6V Output Selected; D1 = 1, D0 = 1
V
IN
Falling
1.8V Output Selected; D1 = 0, D0 = 0
2.5V Output Selected; D1 = 0, D0 = 1
3.3V Output Selected; D1 = 1, D0 = 0
3.6V Output Selected; D1 = 1, D0 = 1
V
SHUNT
I
SHUNT
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
I
VIN
= 1mA
1ms Duration
I
BRIDGE
= 10µA
V
REVERSE
= 18V
I
REVERSE
= 1µA
1.8V Output Selected
Sleep Threshold
Wake-Up Threshold
2.5V Output Selected
Sleep Threshold
Wake-Up Threshold
3.3V Output Selected
Sleep Threshold
Wake-Up Threshold
3.6V Output Selected
Sleep Threshold
Wake-Up Threshold
As a Percentage of the Selected V
OUT
V
OUT
= 3.6V
200
100
1.1
1.3
l
l
l
l
l
l
l
l
l
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l
MIN
TYP
MAX
18.0
UNITS
V
nA
nA
µA
µA
V
V
V
V
V
V
V
V
V
mA
mV
nA
V
450
950
1.7
150
3.77
3.77
4.73
4.73
2.66
2.66
3.42
3.75
19.0
25
350
400
4.04
4.04
5.05
5.05
2.87
2.87
3.67
4.02
20.0
700
1500
2.5
250
4.30
4.30
5.37
5.37
3.08
3.08
3.91
4.28
21.0
450
20
V
UVLO
V
SHUNT
30
l
l
l
l
l
l
l
l
1.710
2.425
3.201
3.492
83
1.812
1.788
2.512
2.488
3.312
3.288
3.612
3.588
92
89
260
1.890
2.575
3.399
3.708
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
150
350
100
1.2
0.4
10
10
V
nA
nA
35881fc
For more information
www.linear.com/LTC3588-1
3
LTC3588-1
ELECTRICAL CHARACTERISTICS
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 LTC3588-1 is tested under pulsed load conditions such
that T
J
≈ T
A
. The LTC3588E-1 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-1 is guaranteed over the full –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.
TYPICAL PERFORMANCE CHARACTERISTICS
1000
900
800
700
I
VIN
(nA)
600
500
400
300
200
100
0
0
1
2
3
V
IN
(V)
4
5
6
35881 G01
I
VIN
in UVLO vs V
IN
D1 = D0 = 1
85°C
25°C
I
VIN
(nA)
–40°C
2400
2200
2000
1800
1600
1400
1200
1000
800
600
400
I
VIN
in Sleep vs V
IN
D1 = D0 = 0
85°C
UVLO RISING (V)
UVLO Rising vs Temperature
5.2
D1 = D0 = 1
5.0
4.8
4.6
4.4
4.2
4.0
D1 = D0 = 0
25°C
–40°C
2
4
6
8
10 12
V
IN
(V)
14
16
18
3.8
–55 –35 –15
35881 G02
5 25 45 65 85 105 125
TEMPERATURE (°C)
35881 G03
UVLO Falling vs Temperature
4.2
D1 = D0 = 1
4.0
UVLO FALLING (V)
3.8
3.6
3.4
3.2
3.0
2.8
–55 –35 –15
D1 = D0 = 0
5 25 45 65 85 105 125
TEMPERATURE (°C)
35881 G04
21.0
20.8
20.6
V
SHUNT
vs Temperature
Total Bridge Rectifier Drop
vs Bridge Current
1800
1600
1400
|V
PZ1
– V
PZ2
| – V
IN
V
SHUNT
(V)
20.2
20.0
19.8
19.6
19.4
19.2
19.0
–55 –35 –15
I
SHUNT
= 25mA
I
SHUNT
= 1mA
V
BRIDGE
(mV)
D1 = 1, D0 = 0
20.4
–40°C
85°C
25°C
1200
1000
800
600
400
200
5 25 45 65 85 105 125
TEMPERATURE (°C)
35881 G05
0
1µ
10µ
100µ
1m
BRIDGE CURRENT (A)
10m
35881 G06
4
35881fc
For more information
www.linear.com/LTC3588-1
LTC3588-1
TYPICAL PERFORMANCE CHARACTERISTICS
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
35881 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
35881 G08
1.8V Output vs Temperature
1.85
SLEEP THRESHOLD
1.80
WAKE-UP THRESHOLD
V
IN
= 18V, LEAKAGE AT PZ1 OR PZ2
1.75
1.70
PGOOD FALLING
1.65
1.60
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
35881 G09
2.5V Output vs Temperature
2.55
SLEEP THRESHOLD
2.50
WAKE-UP THRESHOLD
2.45
V
OUT
(V)
V
OUT
(V)
2.40
2.35
2.30
PGOOD FALLING
3.35
3.30
3.25
3.20
3.15
3.10
3.05
3.3V Output vs Temperature
SLEEP THRESHOLD
WAKE-UP THRESHOLD
3.65
3.60
3.55
V
OUT
(V)
3.50
3.45
3.40
3.35
PGOOD FALLING
5 25 45 65 85 105 125
TEMPERATURE (°C)
35881 G11
3.6V Output vs Temperature
SLEEP THRESHOLD
WAKE-UP THRESHOLD
PGOOD FALLING
3.30
3.25
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
35881 G12
2.25
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
35881 G10
3.00
–55 –35 –15
V
OUT
Load Regulation
2.56
2.54
2.52
V
OUT
(V)
V
OUT
(V)
2.50
2.48
2.46
2.44
V
IN
= 5V, L = 10µH, D1 = 0, D0 = 1
2.56
2.54
2.52
V
OUT
Line Regulation
L = 10µH, I
LOAD
= 100mA, D1 = 0, D0 = 1
120
110
100
90
I
VOUT
(nA)
80
70
60
50
40
30
4
6
8
10
12
V
IN
(V)
14
16
18
I
VOUT
vs Temperature
V
OUT
= 3.6V
V
OUT
= 3.3V
2.50
2.48
2.46
2.44
V
OUT
= 2.5V
V
OUT
= 1.8V
1µ
10µ
100µ
1m
10m
LOAD CURRENT (A)
100m
35881 G13
20
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
35881 G15
35881 G14
35881fc
For more information
www.linear.com/LTC3588-1
5
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