LTC3108IDE#TRPBF datasheet, PDF

LTC3108

Ultralow Voltage Step-Up

Converter and Power Manager

FEATURES

n

DESCRIPTION

The

LTC

®

3108

is a highly integrated DC/DC converter

ideal for harvesting and managing surplus energy from

extremely low input voltage sources such as TEGs (ther-

moelectric generators), thermopiles and small solar cells.

The step-up topology operates from input voltages as

low as 20mV. The LTC3108 is functionally equivalent to

the LTC3108-1 except for its unique fixed V

OUT

options.

Using a small step-up transformer, the LTC3108 provides

a complete power management solution for wireless

sensing and data acquisition. The 2.2V LDO powers an

external microprocessor, while the main output is pro-

grammed to one of four fixed voltages to power a wire-

less transmitter or sensors. The power good indicator

signals that the main output voltage is within regulation.

A second output can be enabled by the host. A storage

capacitor provides power when the input voltage source

is unavailable. Extremely low quiescent current and high

efficiency design ensure the fastest possible charge times

of the output reservoir capacitor.

The LTC3108 is available in a small, thermally enhanced

12-lead (3mm

×

4mm) DFN package and a 16-lead

SSOP package.

n

Operates from Inputs of 20mV

Complete Energy Harvesting Power

Management System

n

Selectable V

OUT

of 2.35V, 3.3V, 4.1V or 5V

n

LDO: 2.2V at 3mA

n

Logic Controlled Output

n

Reserve Energy Output

Power Good Indicator

Uses Compact Step-Up Transformers

Small 12-Lead (3mm

×

4mm) DFN or 16-Lead

SSOP Packages

APPLICATIONS

n

Remote Sensors and Radio Power

Surplus Heat Energy Harvesting

HVAC Systems

Industrial Wireless Sensing

Automatic Metering

Building Automation

Predictive Maintenance

All registered trademarks and trademarks are the property of their respective owners.

TYPICAL APPLICATION

Wireless Remote Sensor Application Powered From a Peltier Cell

1:100

+

THERMOELECTRIC

GENERATOR

20mV TO 500mV

1nF

C1

330pF

C2

SW

VSTORE

LTC3108

V

OUT2

PGOOD

PGD

2.2V

VLDO

5V

1000

0.1F

6.3V

100

µP

TIME (sec)

2.2µF SENSORS

VS2

V

OUT

3.3V

10

V

OUT

Charge Time

V

OUT

= 3.3V

C

OUT

= 470µF

+

220µF

+

470µF

RF LINK

1

1:100 Ratio

1:50 Ratio

1:20 Ratio

0

50

100 150 200 250 300 350 400

V

IN

(mV)

3108 TA01b

VS1 V

OUT2_EN

VAUX

GND

1µF

3108 TA01a

0

Rev. D

Document Feedback

For more information

www.analog.com

1

LTC3108

ABSOLUTE MAXIMUM RATINGS

(Note 1)

SW Voltage ..................................................–0.3V to 2V

C1 Voltage....................................................–0.3V to 6V

C2 Voltage (Note 5).........................................–8V to 8V

V

OUT2

, V

OUT2_EN

..........................................–0.3V to 6V

VAUX.................................................... 15mA into VAUX

VS1, VS2, VAUX, V

OUT

, PGD ........................–0.3V to 6V

VLDO, VSTORE ............................................–0.3V to 6V

Operating Junction Temperature Range

(Note 2)..................................................–40°C to 125°C

Storage Temperature Range ..................–65°C to 125°C

PIN CONFIGURATION

TOP VIEW

VAUX

VSTORE

V

OUT

V

OUT2

VLDO

PGD

1

2

3

4

5

6

13

GND

12

SW

11

C2

10

C1

9

8

7

V

OUT2_EN

VS1

VS2

GND

VAUX

VSTORE

V

OUT

V

OUT2

VLDO

PGD

GND

1

2

3

4

5

6

7

8

TOP VIEW

16 GND

15 SW

14 C2

13 C1

12 V

OUT2_EN

11 VS1

10 VS2

9

GND

DE PACKAGE

12-LEAD (4mm

×

3mm) PLASTIC DFN

T

JMAX

= 125°C,

θ

JA

= 43°C/W

EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB (NOTE 4)

GN PACKAGE

16-LEAD PLASTIC SSOP NARROW

T

JMAX

= 125°C,

θ

JA

= 110°C/W

ORDER INFORMATION

LEAD FREE FINISH

LTC3108EDE#PBF

LTC3108IDE#PBF

LTC3108EGN#PBF

LTC3108IGN#PBF

TAPE AND REEL

LTC3108EDE#TRPBF

LTC3108IDE#TRPBF

LTC3108EGN#TRPBF

LTC3108IGN#TRPBF

PART MARKING*

3108

PACKAGE DESCRIPTION

12-Lead (4mm

×

3mm) Plastic DFN

12-Lead (4mm

×

3mm) Plastic DFN

16-Lead Plastic SSOP

TEMPERATURE RANGE

–40°C to 125°C

Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.

Tape and reel specifications.

Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.

ELECTRICAL CHARACTERISTICS

PARAMETER

Minimum Start-Up Voltage

No-Load Input Current

Input Voltage Range

CONDITIONS

The

l

denotes the specifications which apply over the full operating

junction temperature range, otherwise specifications are for T

A

= 25°C (Note 2). VAUX = 5V, unless otherwise noted.

MIN

TYP

20

3

l

MAX

50

UNITS

mV

mA

Using 1:100 Transformer Turns Ratio, VAUX = 0V

Using 1:100 Transformer Turns Ratio; V

IN

= 20mV, V

OUT2_

EN

= 0V; All Outputs Charged and in Regulation

Using 1:100 Transformer Turns Ratio

V

STARTUP

500

mV

2

Rev. D

For more information

www.analog.com

LTC3108

ELECTRICAL CHARACTERISTICS

PARAMETER

Output Voltage

CONDITIONS

VS1 = VS2 = GND

VS1 = VAUX, VS2 = GND

VS1 = GND, VS2 = VAUX

VS1 = VS2 = VAUX

V

OUT

= 3.3V, V

OUT2_EN

= 0V

No Load, All Outputs Charged

0.5mA Load

For 0mA to 2mA Load

For VAUX from 2.5V to 5V

I

LDO

= 2mA

V

LDO

= 0V

V

OUT

= 0V

VSTORE = 0V

Current into VAUX = 5mA

VSTORE = 5V

V

OUT2

= 0V, V

OUT2_EN

= 0V

l

The

l

denotes the specifications which apply over the full operating

junction temperature range, otherwise specifications are for T

A

= 25°C (Note 2). VAUX = 5V, unless otherwise noted.

MIN

2.30

3.234

4.018

4.90

TYP

2.350

3.300

4.100

5.000

0.2

6

2.134

2.2

0.5

0.05

100

4

2.8

5

11

4.5

5.25

0.1

0.4

0.85

0.01

–7.5

–9

0.15

2.1

l

MAX

2.40

3.366

4.182

5.10

9

2.266

1

0.2

200

7.5

5.60

0.3

1.2

0.1

UNITS

V

µA

V

%

mV

mA

V

µA

V

µA

%

V

OUT

Quiescent Current

VAUX Quiescent Current

LDO Output Voltage

LDO Load Regulation

LDO Line Regulation

LDO Dropout Voltage

LDO Current Limit

V

OUT

Current Limit

VSTORE Current Limit

VAUX Clamp Voltage

VSTORE Leakage Current

V

OUT2

Leakage Current

VS1, VS2 Threshold Voltage

VS1, VS2 Input Current

PGOOD Threshold (Rising)

PGOOD Threshold (Falling)

PGOOD V

OL

PGOOD V

OH

PGOOD Pull-Up Resistance

V

OUT2_EN

Threshold Voltage

V

OUT2_EN

Pull-Down Resistance

V

OUT2

Turn-On Time

V

OUT2

Turn-Off Time

V

OUT2

Current Limit

V

OUT2

Current Limit Response Time

V

OUT2

P-Channel MOSFET On-Resistance

N-Channel MOSFET On-Resistance

VS1 = VS2 = 5V

Measured Relative to the V

OUT

Voltage

Measured Relative to the V

OUT

Voltage

Sink Current = 100µA

Source Current = 0

V

OUT2_EN

Rising

0.3

2.3

1.3

V

MΩ

V

MΩ

µs

2.2

1

5

0.4

(Note 3)

V

OUT

= 3.3V

(Note 3)

V

OUT

= 3.3V (Note 3)

C2 = 5V (Note 3)

l

0.15

0.3

350

1.3

0.5

0.45

A

ns

Ω

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 LTC3108 is tested under pulsed load conditions such that T

J

≈

T

A

. The LTC3108E 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 LTC3108I 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 thermal

package thermal resistance and other environmental factors. The junction

temperature (T

J

) is calculated from the ambient temperature (T

A

) and

power dissipation (P

D

) according to the formula: T

J

= T

A

+ (P

D

•

θ

JA

°C/W),

where

θ

JA

is the package thermal impedance.

Note 3:

Specification is guaranteed by design and not 100% tested in

production.

Note 4:

Failure to solder the exposed backside of the package to the PC

board ground plane will result in a thermal resistance much higher than

43°C/W.

Note 5:

The absolute maximum rating is a DC rating. Under certain

conditions in the applications shown, the peak AC voltage on the C2 pin

may exceed ±8V. This behavior is normal and acceptable because the

current into the pin is limited by the impedance of the coupling capacitor.

Rev. D

For more information

www.analog.com

3

LTC3108

TYPICAL PERFORMANCE CHARACTERISTICS

1000

T

A

= 25°C, unless otherwise noted.

I

VOUT

and Efficiency vs V

IN

,

1:20 Ratio Transformer

I

IN

vs V

IN

, (V

OUT

= 0V)

1:50 RATIO, C1 = 4.7n

1:100 RATIO, C1 = 1n

1:20 RATIO, C1 = 10n

4000

3500

3000

C1 = 10nF

I

VOUT

(V

OUT

= 0V)

80

70

60

EFFICIENCY (%)

50

100

I

VOUT

(µA)

I

IN

(mA)

2500

2000

1500

1000

500

EFFICIENCY

(V

OUT

= 4.5V)

I

VOUT

(V

OUT

= 4.5V)

40

30

20

10

1

10

100

V

IN

(mV)

1000

3108 G00

0

100

200

300

400

0

500

3108 G01

V

IN

(mV)

I

VOUT

and Efficiency vs V

IN

,

1:100 Ratio Transformer

1400

1200

1000

I

VOUT

(µA)

800

600

400

200

0

100

200

300

400

EFFICIENCY

(V

OUT

= 4.5V)

C1 = 1nF

I

VOUT

(V

OUT

= 0V)

70

60

50

EFFICIENCY (%)

40

I

VOUT

(V

OUT

= 4.5V)

30

20

10

0

500

3108 G03

I

VOUT

and Efficiency vs V

IN

,

1:50 Ratio Transformer

3200

2800

2400

I

VOUT

(µA)

2000

1600

1200

800

400

0

100

200

300

400

EFFICIENCY

(V

OUT

= 4.5V)

I

VOUT

(V

OUT

= 4.5V)

C1 = 4.7nF

80

I

VOUT

(V

OUT

= 0V)

70

60

EFFICIENCY (%)

50

40

30

20

10

0

500

3108 G02

V

IN

(mV)

V

IN

(mV)

Input Resistance vs V

IN

(V

OUT

Charging)

10

9

8

INPUT RESISTANCE ( )

7

6

5

4

3

2

1

0

100

200

300

400

500

3108 G04

I

VOUT

vs V

IN

and Source Resistance,

1:20 Ratio

10000

C1 = 10nF

1:20 RATIO

1000

I

VOUT

(µA)

1:50 RATIO

100

1:100 RATIO

10

0

1

2

5

10

0

100 200 300 400 500 600 700 800

V

IN

OPEN-CIRCUIT (mV)

3108 G05

V

IN

(mV)

4

Rev. D

For more information

www.analog.com

LTC3108

TYPICAL PERFORMANCE CHARACTERISTICS

I

VOUT

vs V

IN

and Source Resistance,

1:50 Ratio

10000

C1 = 4.7nF

1000

T

A

= 25°C, unless otherwise noted.

I

VOUT

vs V

IN

and Source Resistance,

1:100 Ratio

C1 = 1nF

1000

I

VOUT

(µA)

I

VOUT

(µA)

100

10

0

1

2

5

10

0

100 200 300 400 500 600 700 800

V

IN

OPEN-CIRCUIT (mV)

3108 G06

10

1

2

5

10

0

100

200

300

400

V

IN

OPEN-CIRCUIT (mV)

500

3108 G07

I

VOUT

vs dT and TEG Size,

1:100 Ratio

10000

V

OUT

= 0V

40mm

TEG

15mm

TEG

100

C1 PIN

2V/DIV

C2 PIN

2V/DIV

SW PIN

50mV/

DIV

Resonant Switching Waveforms

V

IN

= 20mV

1:100 RATIO TRANSFORMER

1000

I

VOUT

(µA)

10

0

0.1

1:50 RATIO

1:100 RATIO

1:50 RATIO

1:100 RATIO

10

1

dT ACROSS TEG (°C)

100

3108 G08

10µs/DIV

3108 G09

LDO Load Regulation

0.00

0.20

0.18

DROPOUT VOLTAGE (V)

–0.25

DROP IN VLDO (%)

0.16

0.14

0.12

0.10

0.08

0.06

0.04

0.02

–1.00

0

0.5

1

1.5 2 2.5

LDO LOAD (mA)

3

3.5

4

3108 G10

LDO Dropout Voltage

–0.50

–0.75

0.00

0

0.5

1

1.5 2 2.5

LDO LOAD (mA)

3

3.5

4

3108 G11

Rev. D

For more information

www.analog.com

5

Parameter Name	Attribute value
EU restricts the use of certain hazardous substances	Compliant
ECCN (US)	EAR99
Part Status	Active
Product Category	Step-Up Converter and Power Manager
Input Voltage (V)	0.02 to 0.5
Minimum Operating Temperature (°C)	-40
Maximum Operating Temperature (°C)	125
Supplier Temperature Grade	Industrial
Packaging	Tape and Reel
Supplier Package	DFN EP
Pin Count	12
Standard Package Name	DFN
Mounting	Surface Mount
Package Height	0.75(Max)
Package Length	4
Package Width	3
PCB changed	12
Lead Shape	No Lead

	LTC3108IDE#TRPBF	LTC3108EDE#PBF	LTC3108EDE#TRPBF	LTC3108EGN#PBF	LTC3108EGN#TRPBF	LTC3108IDE#PBF	LTC3108IGN#PBF	LTC3108IGN#TRPBF
Description	Step-Up Converter and Power Manager 12-Pin DFN EP T/R	Step-Up Converter and Power Manager 12-Pin DFN EP Tube	Step-Up Converter and Power Manager 12-Pin DFN EP T/R	Step-Up Converter and Power Manager 16-Pin SSOP N Tube	Step-Up Converter and Power Manager 16-Pin SSOP N T/R	Step-Up Converter and Power Manager 12-Pin DFN EP Tube	Step-Up Converter and Power Manager 16-Pin SSOP N Tube	Step-Up Converter and Power Manager 16-Pin SSOP N T/R
EU restricts the use of certain hazardous substances	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant
ECCN (US)	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Part Status	Active	Active	Active	Active	Active	Active	Active	Active
Product Category	Step-Up Converter and Power Manager	Step-Up Converter and Power Manager	Step-Up Converter and Power Manager	Step-Up Converter and Power Manager	Step-Up Converter and Power Manager	Step-Up Converter and Power Manager	Step-Up Converter and Power Manager	Step-Up Converter and Power Manager
Input Voltage (V)	0.02 to 0.5	0.02 to 0.5	0.02 to 0.5	0.02 to 0.5	0.02 to 0.5	0.02 to 0.5	0.02 to 0.5	0.02 to 0.5
Minimum Operating Temperature (°C)	-40	-40	-40	-40	-40	-40	-40	-40
Maximum Operating Temperature (°C)	125	125	125	125	125	125	125	125
Supplier Temperature Grade	Industrial	Extended	Extended	Extended	Extended	Industrial	Industrial	Industrial
Packaging	Tape and Reel	Tube	Tape and Reel	Tube	Tape and Reel	Tube	Tube	Tape and Reel
Supplier Package	DFN EP	DFN EP	DFN EP	SSOP N	SSOP N	DFN EP	SSOP N	SSOP N
Pin Count	12	12	12	16	16	12	16	16
Standard Package Name	DFN	DFN	DFN	SOP	SOP	DFN	SOP	SOP
Mounting	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package Height	0.75(Max)	0.75(Max)	0.75(Max)	1.5(Max)	1.5(Max)	0.75(Max)	1.5(Max)	1.5(Max)
Package Length	4	4	4	4.98(Max)	4.98(Max)	4	4.98(Max)	4.98(Max)
Package Width	3	3	3	3.99(Max)	3.99(Max)	3	3.99(Max)	3.99(Max)
PCB changed	12	12	12	16	16	12	16	16
Lead Shape	No Lead	No Lead	No Lead	Gull-wing	Gull-wing	No Lead	Gull-wing	Gull-wing
HTS	-	8542.39.00.01	8542.39.00.01	8542.39.00.01	8542.39.00.01	8542.39.00.01	8542.39.00.01	-

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