Datasheet

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LTC3588-2

35882fa

Typical applicaTion

DescripTion

Piezoelectric Energy

Harvesting Power Supply

with 14V Minimum V

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

transducers.

An ultralow quiescent current undervoltage lockout (UVLO)

mode with a 16V rising threshold enables efficient energy

extraction from piezoelectric transducers 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

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.

High Voltage Piezoelectric Energy Harvesting Power Supply

FeaTures

applicaTions

1500nA Input Quiescent Current (Output in

Regulation – No Load, V

= 18V)

830nA Input Quiescent Current in UVLO, V

= 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

≥ 20V

Available in 10-Lead MSE and 3mm × 3mm DFN

Packages

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

35882 TA01

PZ1

CAP

IN2

PZ2

OUT

PGOOD

D0, D1

LTC3588-2

MIDE V25W

GND

1µF

4.7µF

10µF

25V

STORAGE

OUTPUT

VOLTAGE

SELECT

OUT

22µH

LTC3588-2 5.0V Regulator Start-Up Profile

TIME (sec)

VOLTAGE (V)

200

35882 TA01b

600400

OUT

PGOOD = LOGIC 1

= 10µF, C

STORAGE

= 47µF

NO LOAD, I

VIN

= 2µA

Summary of content (18 pages)

PAGE 1
LTC3588-2 Piezoelectric Energy Harvesting Power Supply with 14V Minimum VIN Description Features n n n n n n n n n n 1500nA Input Quiescent Current (Output in Regulation – No Load, VIN = 18V) 830nA Input Quiescent Current in UVLO, VIN = 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.
PAGE 2
LTC3588-2 Absolute Maximum Ratings (Note 1) VIN Low Impedance Source........................ –0.3V to 18V* Current Fed, ISW = 0A....................................... 25mA† PZ1, PZ2............................................................0V to VIN D0, D1...............–0.3V to [Lesser of (VIN2 + 0.3V) or 6V] CAP....................... [Higher of –0.3V or (VIN – 6V)] to VIN VIN2.................... –0.3V to [Lesser of (VIN + 0.
PAGE 3
LTC3588-2 Electrical Characteristics The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are for TA = 25°C (Note 2). VIN = 18V unless otherwise specified.
PAGE 4
LTC3588-2 Typical Performance Characteristics Input IQ in UVLO vs VIN 125°C 1600 125°C 16.2 2800 1200 85°C 1000 INPUT IQ (nA) INPUT IQ (nA) UVLO Rising vs Temperature 16.4 3200 1400 25°C 800 –40°C 600 400 200 0 Input IQ in Sleep vs VIN 3600 0 2 4 6 8 10 VIN (V) 12 14 UVLO RISING (V) 1800 2400 2000 85°C 1600 25°C 1200 –40°C 800 16 14 15 16 VIN (V) 35882 G01 UVLO Falling vs Temperature 15.8 15.6 –50 18 17 21.2 1800 21.
PAGE 5
LTC3588-2 Typical Performance Characteristics 4.1V Output vs Temperature 4.60 5.10 SLEEP THRESHOLD SLEEP THRESHOLD SLEEP THRESHOLD 4.10 5.00 4.50 WAKE-UP THRESHOLD WAKE-UP THRESHOLD WAKE-UP THRESHOLD 3.90 4.90 4.40 VOUT (V) 4.00 VOUT (V) VOUT (V) 5.0V Output vs Temperature 4.5V Output vs Temperature 4.20 4.30 4.80 4.70 3.80 4.20 PGOOD FALLING 3.70 –50 –25 0 25 75 50 TEMPERATURE (°C) 100 4.10 –50 125 0 25 75 50 TEMPERATURE (°C) –25 35882 G10 IVOUT (nA) VOUT (V) 4.10 4.
PAGE 6
LTC3588-2 Typical Performance Characteristics 100 94 VIN = 15V 90 80 EFFICIENCY (%) EFFICIENCY (%) 70 60 50 40 30 10 0 1µ 10µ 100µ 1m 10m LOAD CURRENT (A) 90 90 80 88 86 80 14 15 35881 G19 90 94 VIN = 15V 70 EFFICIENCY (%) EFFICIENCY (%) 80 60 50 40 30 VOUT = 5.0V VOUT = 4.5V VOUT = 4.1V VOUT = 3.45V 20 10 0 1µ 10µ 100µ 1m 10m LOAD CURRENT (A) 100m 35882 G22 17 70 60 30 18 100 92 90 90 80 88 86 VOUT = 5.0V VOUT = 4.5V VOUT = 4.1V VOUT = 3.
PAGE 7
LTC3588-2 Pin Functions PZ1 (Pin 1): Input connection for piezoelectric element or other AC source (used in conjunction with PZ2). VIN2 (Pin 7): Internal low voltage rail to serve as gate drive for buck NMOS switch. Also serves as a logic high rail for output voltage select bits D0 and D1. A 4.7µF capacitor should be connected from VIN2 to GND. This pin is not intended for use as an external system rail.
PAGE 8
LTC3588-2 Operation Internal Bridge Rectifier The LTC3588-2 has an internal full-wave bridge rectifier accessible via the differential PZ1 and PZ2 inputs that rectifies AC inputs such as those from a piezoelectric element. The rectified output is stored on a capacitor at the VIN pin and can be used as an energy reservoir for the buck converter. The low-loss bridge rectifier has a total drop of about 400mV with typical piezo generated currents (~10µA). The bridge is capable of carrying up to 50mA.
PAGE 9
LTC3588-2 operation Though the quiescent current when the buck is switching is much greater than the sleep quiescent current, it is still a small percentage of the average inductor current which results in high efficiency over most load conditions. The buck operates only when sufficient energy has been accumulated in the input capacitor and the length of time the converter needs to transfer energy to the output is much less than the time it takes to accumulate energy.
PAGE 10
LTC3588-2 Operation transition low until the new regulation point is reached. When VOUT is programmed to a lower voltage, PGOOD will remain high through the transition. Energy Storage Harvested energy can be stored on the input capacitor or the output capacitor. The high UVLO threshold takes advantage of the fact that energy storage on a capacitor is proportional to the square of the capacitor voltage.
PAGE 11
LTC3588-2 applications information 10µF 25V 1µF 6V PZ1 PZ2 VIN PGOOD CAP LTC3588-2 D1 D0 5V MICROPROCESSOR CORE VOUT VIN2 4.7µF 6V SW GND TX EN 22µH OUTPUT VOLTAGE 50mV/DIV AC-COUPLED GND 47µF 6V LOAD CURRENT 25mA/DIV 5mA 35882 F05a 250µs/DIV VIN = 18V L = 22µH, COUT = 47µF LOAD STEP BETWEEN 5mA and 55mA 35882 F05b Figure 5.
PAGE 12
LTC3588-2 Applications Information effect during this time. For applications where the output must reach regulation on a single UVLO cycle, the energy required to charge the output capacitor must be taken into account when sizing CIN. The duration for which the regulator sleeps depends on the load current and the size of the output capacitor. The sleep time decreases as the load current increases and/or as the output capacitor decreases.
PAGE 13
LTC3588-2 Applications Information ADVANCED CERAMETRICS PFCB-W14 PGOOD1 PZ1 PZ2 PZ1 PZ2 PGOOD VIN VIN PGOOD 22µH 5.0V SW LTC3588-2 VOUT 10µF 6V CAP 1µF 6V 10µF 25V VIN2 D1 D0 GND 1µF 6V 4.7µF 6V 10µF 25V LTC3588-2 CAP 22µH 3.45V SW VOUT VIN2 4.7µF 6V PGOOD2 10µF 6V D1 D0 GND 35882 F06 Figure 6.
PAGE 14
LTC3588-2 applications information The frequency of the emission will be 120Hz for magnetic ballasts but could be higher if the light uses electronic ballast. The LTC3588-2 bridge rectifier can handle a wide range of input frequencies. Figure 9 shows the LTC3588-2 powered by a 48V communications line. In this example, 1mA is the maximum current that is allowed to be drawn. The 28k current limiting resistor sets this current as the LTC3588-2 will shunt VIN at 20V.
PAGE 15
LTC3588-2 Package Description DD Package 10-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1699 Rev C) 0.70 ±0.05 3.55 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC 2.38 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 3.00 ±0.10 (4 SIDES) R = 0.125 TYP 6 0.40 ± 0.10 10 1.65 ± 0.10 (2 SIDES) PIN 1 NOTCH R = 0.20 OR 0.35 × 45° CHAMFER PIN 1 TOP MARK (SEE NOTE 6) 0.200 REF 0.75 ±0.05 0.00 – 0.05 5 1 (DD) DFN REV C 0310 0.25 ± 0.05 0.50 BSC 2.
PAGE 16
LTC3588-2 Package Description MSE Package 10-Lead Plastic MSOP, Exposed Die Pad (Reference LTC DWG # 05-08-1664 Rev G) BOTTOM VIEW OF EXPOSED PAD OPTION 1.88 ± 0.102 (.074 ± .004) 5.23 (.206) MIN 1 0.889 ± 0.127 (.035 ± .005) 0.05 REF 10 0.305 ± 0.038 (.0120 ± .0015) TYP RECOMMENDED SOLDER PAD LAYOUT 3.00 ± 0.102 (.118 ± .004) (NOTE 3) DETAIL “B” CORNER TAIL IS PART OF DETAIL “B” THE LEADFRAME FEATURE.
PAGE 17
LTC3588-2 Revision History REV DATE DESCRIPTION PAGE NUMBER A 5/11 Add brackets to Absolute Maximum Ratings for VOUT and PGOOD. 2 Replace MS package description to the correct MSE package description. 15 Add to Related Parts section and order parts by part number. 16 35882fa Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use.
PAGE 18
LTC3588-2 Typical Application Piezoelectric Shunt Charger for Small Li-Ion Cells or Thin Film Batteries ADVANCED CERAMETRICS PFCB-W14 1µF 6.3V 22µF 25V PZ1 PZ2 VIN SW 22µH 8.87k 100µA CONTINUOUS 20mA PULSED LTC3588-2 VOUT CAP COUT 47µF 6.3V VIN2 4.7µF 6.3V VOUT 5.0V D1 D0 PGOOD GND VCC NTCBIAS 10k DMP2104LP ADJ NC7SVL04 LTC4070 NTC T* LBO GND * NTHS0805E3103LT LOCATE NEAR BATTERY 4.7M Li-ION + INFINITE POWER SOLUTIONS MEC101-10SES 4.