MAXIM MAX17710 Technical data

E V A L U A T I O N K IT A V A I L A B L E

19-5872; Rev 1; 7/11

MAX17710

Energy-Harvesting Charger and Protector

General Description

The MAX17710 is a complete system for charging and protecting micropower-storage cells such as Infinite Power Solution’s THINERGY® microenergy cells (MECs). The IC can manage poorly regulated sources such as energyharvesting devices with output levels ranging from 1FW to 100mW. The device also includes a boost regulator circuit for charging the cell from a source as low as 0.75V (typ). An internal regulator protects the cell from overcharging.

Output voltages supplied to the target applications are regulated using a low-dropout (LDO) linear regulator with selectable voltages of 3.3V, 2.3V, or 1.8V. The output regulator operates in a selectable low-power or ultra-low-power mode to minimize drain of the cell. Internal voltage protection prevents the cell from overdischarging.

The device is available in an ultra-thin, 3mm x 3mm x

0.5mm 12-pin UTDFN package.

Applications

Powered/Smart Cards Remote Wireless

Sensors Memory and Real-Time

Clock Backup Semiactive RFID Tags

Medical Devices High-Temperature

Applications Military/DoD and

Aerospace Toys

Features

S Integrated Power-Management IC for Energy

Storage and Load Management

S Lithium Charger

1nA Standby I

625nA Linear Charging

QBATT

1µW Boost Charging

S Lithium Cell Undervoltage Protection

S Charger Overvoltage Shunt Protection

S 1.8V, 2.3V, or 3.3V LDO (150nA I

QBATT

)

S Lithium Cell Output Buffering

S Ultra-Thin, 3mm x 3mm x 0.5mm UTDFN Package

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/MAX17710.related

Simplified Operating Circuit

THINERGY

MEC101

RF OR OTHER

HIGH-VOLTAGE

SOURCE

TEG, SOLAR,

OR OTHER

LOW-VOLTAGE

SOURCE

THINERGY is a registered trademark of Infinite Power Solutions, Inc.

�� Maxim Integrated Products 1

BATT

SEL2

CHG

LX

FB

EP

MAX17710

GND

PCKP

REG

AE

LCE

PGND SEL1

UNREGULATED OUTPUT

REGULATED OUTPUT

LDO CONTROL SIGNALS

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

MAX17710

Energy-Harvesting Charger and Protector

ABSOLUTE MAXIMUM RATINGS

BATT to GND ........................................................... -0.3V to +6V

CHG to GND ...........................................................-0.3V to +6V

LX to PGND .............................................................-0.3V to +6V

GND to PGND ......................................................-0.3V to +0.3V

FB, AE, LCE, SEL1, SEL2, REG,

PCKP to GND .......................................-0.3V to V

BATT

+ 0.3V CHG Continuous Current

(limited by power dissipation of package) ...................100mA

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(V

= +4.3V, Figure 1, TA = -40NC to +85NC, unless otherwise noted. Typical values are at T

CHG

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

CHG Input Maximum Voltage Limited by shunt regulator (Note 2) 4.875 5.3 5.7 V

CHG Enable Threshold V

CHG Quiescent Current I

CHG Shunt Delay 25 CHG Input Shunt Limit (Note 2) 50 mA

CHG Maximum Input Current

CHG-to-BATT Dropout Voltage

BATT REG

BATT Regulator Voltage 4.065 4.125 4.160 V

BATT Regulation Delay V

BATT Quiescent Current I

CE

QCHGVCHG

V

CHG

Maximum Ratings

V

CHG

V

CHG

V

CHG

V

CHG

Regulator in dropout; V

CHG

Harvest standby (AE pulse low) V

QBATT

CHG

AE regulator on, boost off; V

CHG

LCE regulator on, boost off; V

BATT

= 4.0V rising, V

input current limited by Absolute

= 4.0V, I

= 4.2V, starting at 4V 30

= 4.15V, V

= 0V, V

= 4.0V, LCE mode (Note 3)

Continuous Power Dissipation (TA = +70NC)

12-Pin UTDFN (derate 15mW/NC above +70NC) .......1200mW

Operating Temperature Range .......................... -40NC to +85NC

Junction Temperature .....................................................+150NC

Storage Temperature Range ............................ -65NC to +150NC

Lead Temperature (soldering, 10s) ................................+300NC

Lead Temperature (reflow) ..............................................+260NC

= +25NC.) (Note 1)

A

4.07 4.15 4.21 V

= 4.0V 625 1300 nA

BATT

50 100 mA

= 1FA

CHG

= -6mA 55

BATT

= -20mA 65

BATT

= -40mA 100

BATT

= 4.12V

BATT

= 2.1V to 4.0V

BATT

= 4.0V, AE high

BATT

45

450 1030

1 165

725 1650

150 550

Fs

mV

Fs

nA

�� Maxim Integrated Products 2

MAX17710

Energy-Harvesting Charger and Protector

ELECTRICAL CHARACTERISTICS (continued)

(V

= +4.3V, Figure 1, TA = -40NC to +85NC, unless otherwise noted. Typical values are at T

CHG

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

LINEAR LDO REGULATOR

V

REG Voltage

REG Voltage, LCE Mode (Note 3)

REG Current Limit

PCKP

V

PCKP

V

PCKP

V

PCKP

V

PCKP

V

PCKP

V

REG

V

REG

= 4.0V, I

= 2.15V, V

= 50FA, SEL1 = open

REG

= 50FA, SEL1 = GND

REG

= 50FA, SEL1 = BATT

REG

= 50FA, SEL1 = open

REG

= 50FA, SEL1 = GND

REG

= 50FA, SEL1 = BATT

REG

= 3.8V, AE high 75 mA

PCKP

= 3.8V, LCE mode

PCKP

(Note 3)

REG Startup Time

V

= 4.0V, AE rising, C

PCKP

REG

= 1FF

SEL1 = open 2.175

LCE Threshold High (Note 4) V

IH-LCE

SEL1 = BATT 1.30 SEL1 = open 0.9

LCE Threshold Low (Note 5) V

IL-LCE

SEL1 = BATT 0.5

PCKP REGULATOR

AE Threshold High V

AE Threshold Low V

AE Low Input Current

IH-AE

IL-AE

VAE = 0V, persists < 1Fs

VAE = 0V, persists > 1Fs

AE High Input Current VAE = 3.6V 1 nA

PCKP Enable Threshold REG enabled 3.62 3.7 3.78 V

PCKP Charge Current V

PCKP Impedance Ramp Rate

BATT Undervoltage Lockout (UVLO) Delay

BATT UVLO Delay t

t

UVLO1

UVLO2

BATT UVLO Threshold

= 0V, V

PCKP

V

= 4.0V, resistance between BATT

BATT

= 2.2V 100 mA

BATT

and PCKP from high impedance to 5I

V

= 2.15V, AE high, first ramp of

BATT

PCKP

V

= 2.15V, AE high, not first PCKP

BATT

ramp

AE regulator active, LCE regulator inactive 1.990 2.15 2.30

LCE regulator active, AE regulator inactive 3

= +25NC.) (Note 1)

A

3.22 3.3 3.37

2.25 2.3 2.375

1.75 1.8 1.9

2.9 3.3 3.7

2.1 2.3 2.5

1.6 1.8 2.05

50

5.3 ms

1.13 V

0.15 V

-4 -2

1 nA

5 ms

5 s

0.5 ms

V

FA

VSEL1 = GND 1.575

VSEL1 = GND 0.6

FA

V

�� Maxim Integrated Products 3

MAX17710

Energy-Harvesting Charger and Protector

ELECTRICAL CHARACTERISTICS (continued)

(V

= +4.3V, Figure 1, TA = -40NC to +85NC, unless otherwise noted. Typical values are at T

CHG

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

BOOST REGULATOR

CHG Regulation Voltage V

Frequency V

Boost Turn-On Time t

FB Threshold

FB Input Current Low VFB = GND, momentary 600 nA

LX nMOS On-Resistance R

Note 1: Specifications are 100% production tested at TA = +25NC. Limits over the operating temperature range are guaranteed by

design and characterization.

Note 2: Since the CHG shunt regulator has a 25Fs delay, the user must limit the voltage to the Absolute Maximum Rating until the

internal CHG shunt provides the voltage limit at the pin in response to 50mA input. Larger currents must be shunted with an external clamp to protect the CHG pin from damage.

Note 3: LCE mode is entered by pulsing AE high, then pulsing AE low. Note 4: For logic-high, connect LCE to the REG output. Do not connect to the BATT or PCKP pins. Note 5: Since LCE is compared to the REG pin voltage for operation, the low-power regulator cannot be switched off under condi-

tions where the REG output is shorted to GND.

BOOST-ON

FB

ON

FB

OFF

DS-ON

= 4.125V 4.3 4.5 4.7 V

BATT

= 3.9V, V

BATT

Design guidance, typical only 850 ns

Rising (enable) 0.485 0.75 1.0

Falling (disable), V

I

= 20mA, V

LX

ILX = 10mA, V

= 3.95V 0.73 1 1.27 MHz

CHG

= 3.8V 0.22 0.25 0.27

CHG

= 3.8V, SEL2 = GND 0.275 0.5 0.7

BATT

= 3.8V, SEL2 = open 4 8 12

BATT

= +25NC.) (Note 1)

A

V

I

�� Maxim Integrated Products 4

MAX17710

Energy-Harvesting Charger and Protector

Table 1. Summary of Typical Quiescent Current vs. Operating Conditions

NAME MODE CONDITIONS

Standby

Shutdown

Full Charge

Dropout Charge

AE Active

AE and LCE Active

LCE Active

Cell Connection: Regulator outputs off, no charger present

UVLO or Shutdown: Regulator outputs off, no charger present

Charger Present: Regulator outputs off, cell charging

Charger in Dropout: Regulator outputs off, charger present, but below regulation voltage

AE Regulator On: Boost off, no charge source present

AE and LCE Regulators On: Boost off, no charge source present

LCE Regulator On: Boost off, no charge source present

Cell connected to circuit during assembly

V

falls below 2.15V

BATT

or AE and LCE pulsed low

V

= 4V,

CHG

V

> V

CHG

AE pulsed low

V

CHG

V

BATT

AE pulsed low

AE pulsed high 725 — 725 (from cell)

LCE pulsed high after AE pulsed high

AE pulsed high, then LCE pulsed high, then AE pulsed low

BATT,

= 4.15V,

= 4.12V,

I

QBATT

(nA)

1 — 1 (from cell)

1 625

450 — 450 (from cell)

875 — 875 (from cell)

150 — 150 (from cell)

I

QCHG

(nA)

TOTAL QUIESCENT

CURRENT (nA)

626 (from energy-harvesting cell); can harvest down to

1µW

�� Maxim Integrated Products 5

Energy-Harvesting Charger and Protector

(TA = +25°C, unless otherwise noted.)

6

5

4

3

VOLTS (V)

2

1

0

190

170

150

(nA)

DD

I

130

110

90

3.0

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

HARVEST SOURCE POWER (µW)

0.2

0.1

0

3.5 3.7 4.14.03.6

REGULATOR STARTUP

AE

REG

PCKP

0 10

IDD vs. V

5

TIME (ms)

OVERTEMPERATURE

BATT

LCE = VREG, AE, AND SEL1 = GND

T

= +85°C

A

V

BATT

TA = +25°C

4.03.5

(V)

= -40°C

T

A

BOOST CIRCUIT BREAK-EVEN

THRESHOLD vs. CELL VOLTAGE

(STANDARD APPLICATION CIRCUIT)

3.93.8

V

(V)

BATT

6

MAX17710 toc01

MAX17710 toc04

MAX17710 toc07

5

4

3

VOLTS (V)

2

1

0

825

775

725

(nA)

675

DD

I

625

575

525

3.5

3.3

3.1

2.9

2.7

2.5

2.3

2.1

REGULATOR VOLTAGE (V)

1.9

1.7

1.5

Typical Operating Characteristics

BOOST STARTUP

LX

SOLAR

0

IDD vs. V

TIME (µs)

OVERTEMPERATURE

BATT

AE = BATT, LCE, AND SEL1 = GND

TA = +85°C

= -40°C

V

BATT

TA = +25°C

(V)

T

A

AE LOAD REGULATION

0 200

LOAD (mA)

CHG

8642

4.03.53.0

15010050

MAX17710

IDD vs. V

LCE AND AE AND SEL1 = GND

10

(nA)

DD

I

9

8

7

T

6

5

4

3

2

1

0

3.0

MAX17710 toc02

MEC101 CELL CHARGE PROFILE

4.15 0.50

4.10

MAX17710 toc05

4.05

4.00

3.95

3.90

CELL VOLTAGE (V)

3.85

3.80

3.75 0 50 100 150 200 250

3.5

3.3

MAX17710 toc08

3.1

2.9

2.7

2.5

2.3

2.1

REGULATOR VOLTAGE (V)

1.9

1.7

1.5 0

OVERTEMPERATURE

BATT

= +85°C

A

= +25°C

T

A

= -40°C

T

A

V

(V)

BATT

2.5mW CHARGE SOURCE

I

BATT

V

BATT

TIME (Minutes)

LCE LOAD REGULATION

LOAD (µA)

4.03.5

MAX17710 toc06

10050

MAX17710 toc03

0.45

0.40

CHARGE CURRENT (mA)

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0

MAX17710 toc09

�� Maxim Integrated Products 6

MAXIM MAX17710 Technical data

Specifications and Main Features

Frequently Asked Questions

User Manual

General Description

Applications

Features

Simplified Operating Circuit

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

Typical Operating Characteristics