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LTC3588-1

Piezoelectric Energy

Harvesting Power Supply

FEATURES

n

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

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.

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

n

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

V

IN

1μF

6V

C

STORAGE

25V

4.7μF

6V

CAP

V

IN2

GND

35881 TA01

ADVANCED CERAMETRICS PFC-W14

VOLTAGE (V)

PZ1

LTC3588-1

PZ2

SW

V

OUT

2

OUTPUT

VOLTAGE

SELECT

47μF

6V

10μH

V

OUT

14

12

10

8

6

4

2

0

200

V

IN

PGOOD

D0, D1

V

OUT

PGOOD = LOGIC 1

400

TIME (s)

600

35881 TA01b

35881f

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 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-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

LTFKX

PACKAGE DESCRIPTION

10-Lead (3mm

×

3mm) Plastic DFN

10-Lead (3mm

×

3mm) Plastic DFN

10-Lead Plastic MSOP

TEMPERATURE RANGE

–40°C to 85°C

–40°C to 125°C

–40°C to 85°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/

35881f

2

LTC3588-1

ELECTRICAL CHARACTERISTICS

SYMBOL

V

IN

I

VIN

PARAMETER

Input Voltage Range

V

IN

Quiescent Current

UVLO

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 at T

J

= 25°C. 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

l

MIN

TYP

MAX

18.0

UNITS

V

nA

μA

V

mA

mV

nA

V

450

950

1.7

150

3.77

4.73

2.66

3.42

3.75

19.0

25

350

400

4.04

5.05

2.87

3.67

4.02

20.0

700

1500

2.5

250

4.30

5.37

3.08

3.91

4.28

21.0

450

20

V

UVLO

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

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

V

SHUNT

30

V

OUT

Regulated Output Voltage

l

1.710

2.425

3.201

3.492

83

200

100

1.812

1.788

2.512

2.488

3.312

3.288

3.612

3.588

92

89

260

1.1

1.3

1.890

2.575

3.399

3.708

V

%

nA

mA

Ω

%

V

PGOOD Falling Threshold

I

VOUT

I

PEAK

I

LOAD

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

l

100

1.2

0.4

10

V

nA

35881f

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 LTC3588E-1 is guaranteed to meet performance speciﬁcations

from 0°C to 85°C. Speciﬁcations over the –40°C to 85°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 is determined by speciﬁc

operating conditions in conjunction with board layout, the rated package

thermal resistance and other environmental factors.

Note 3:

T

J

is calculated from the ambient T

A

and power dissipation P

D

according to the following formula: T

J

= T

A

+ (P

D

•

θ

JA

).

Note 4:

Dynamic supply current is higher due to gate charge being

TYPICAL PERFORMANCE CHARACTERISTICS

I

VIN

in UVLO vs V

IN

1000

900

800

700

I

VIN

(nA)

600

500

400

300

200

100

0

1

2

3

V

IN

(V)

4

5

6

35881 G01

I

VIN

in Sleep vs V

IN

2400

85°C

2200

2000

25°C

I

VIN

(nA)

–40°C

1800

1600

1400

1200

1000

800

600

400

2

4

6

8

10 12

V

IN

(V)

14

16

18

4.0

–40°C

25°C

85°C

UVLO RISING (V)

4.8

4.6

4.4

4.2

D1 = D0 = 0

5.2

5.0

UVLO Rising vs Temperature

D1 = D0 = 1

D1 = D0 = 0

3.8

–55 –35 –15

5 25 45 65 85 105 125

TEMPERATURE (°C)

35881 G03

35881 G02

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

V

SHUNT

vs Temperature

21.0

20.8

20.6

V

BRIDGE

(mV)

1800

1600

1400

1200

1000

800

600

400

200

5 25 45 65 85 105 125

TEMPERATURE (°C)

35881 G05

Total Bridge Rectiﬁer Drop

vs Bridge Current

|V

PZ1

– V

PZ2

| – V

IN

D1 = 1, D0 = 0

V

SHUNT

(V)

20.4

20.2

20.0

19.8

19.6

19.4

19.2

19.0

–55 –35 –15

I

SHUNT

= 25mA

I

SHUNT

= 1mA

–40°C

85°C

25°C

0

1μ

10μ

100μ

1m

BRIDGE CURRENT (A)

10m

35881 G06

35881f

4

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

1.75

V

IN

= 18V, LEAKAGE AT PZ1 OR PZ2

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)

3.30

3.35

3.3V Output vs Temperature

3.65

SLEEP THRESHOLD

3.60

WAKE-UP THRESHOLD

3.25

V

OUT

(V)

3.20

3.15

3.10

3.6V Output vs Temperature

SLEEP THRESHOLD

WAKE-UP THRESHOLD

3.55

3.50

3.45

3.40

3.35

2.40

2.35

2.30

PGOOD FALLING

3.05

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

5 25 45 65 85 105 125

TEMPERATURE (°C)

35881 G11

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

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

4

6

8

10

12

V

IN

(V)

14

16

18

20

–55 –35 –15

5 25 45 65 85 105 125

TEMPERATURE (°C)

35881 G15

35881 G14

35881f

5

LTC3588EDD-1PBF

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