Maxim MAX1665XESA, MAX1665VESA, MAX1665SESA Datasheet

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General Description

The MAX1665 provides protection against overvoltage, undervoltage, overcharge current, and overdischarge current for 2-cell to 4-cell lithium-ion (Li+) battery packs. Very low operating current ensures that cells are not overdischarged during long storage periods.

The MAX1665 controls two external N-channel MOSFETs to limit the charge and discharge voltages. Charging is allowed when the per-cell voltage is below +4.3V. When the voltage on any cell rises above +4.3V (overvoltage limit), the MAX1665 turns off the charge MOSFET. This safety feature prevents overcharge of any cell within the battery pack.

Discharge is allowed when the per-cell voltage is above +2.5V (undervoltage limit). If the voltage across any cell falls below +2.5V, the MAX1665 turns off the discharge MOSFET. This safety feature prevents overdischarge of any cell within the battery pack.

Charging and discharging are allowed if the voltage between PKN and BN is less than 250mV. This safety feature prevents excessive pack current.

Applications

Lithium-Ion Battery Packs

____________________________Features

♦ Complete Protection Against:

Cell Overvoltage Cell Undervoltage

♦ Pack Protection for Excessive Charge and

Discharge

♦ Very Low Supply Current: 16µA typ

♦ Low Standby Current: 1µA max

♦ Matched Cell Input Bias Current (<500pA)

Preserves Cell Balance

MAX1665S/V/X

Lithium-Ion Battery Pack Protector

________________________________________________________________ Maxim Integrated Products 1

B1P

PKN

BN

1

2

87I.C. [B3P]

B2PDSG

CHG

I.C. (B4P)

NOTES: I.C. = INTERNAL CONNECTION. MAKE NO CONNECTIONS TO THIS PIN. ( ) ARE FOR THE MAX1665X. [ ] ARE FOR THE MAX1665V AND MAX1665X.

SO

TOP VIEW

3

4

6

5

MAX1665S MAX1665V MAX1665X

MAX1665X

B4P B3P

DSG

B2P

B1P

PKN

(-)

(+)

CHG

BN

Typical Operating Circuit

19-1605; Rev 0; 1/00

Pin Configuration

Ordering Information

PART

MAX1665SESA

MAX1665VESA

MAX1665XESA -40°C to +85°C

-40°C to +85°C

TEMP. RANGE

PIN-

PACKAGE

8 SO

CELL

COUNT

2

3

4

MAX1665S/V/X

Lithium-Ion Battery Pack Protector

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

B2P

= 8V (MAX1665S), V

B3P

= 12V (MAX1665V), V

B4P

= 16V (MAX1665X), TA= 0°C to +85°C, unless otherwise noted. Typical

values are at T

A

= +25°C.)

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.

B4P to PKN (MAX1665X)........................................-0.3V to +24V

B3P to PKN (MAX1665V)........................................-0.3V to +18V

B2P to PKN (MAX1665S)........................................-0.3V to +12V

B1P to PKN, B2P to B1P, B3P to B2P, B4P to B3P...-0.3V to +6V CHG to PKN, DSG to BN

MAX1665S............................................-0.3V to (V

B2P

+ 0.3V)

MAX1665V............................................-0.3V to (V

B3P

+ 0.3V)

MAX1665X............................................-0.3V to (V

B4P

+ 0.3V)

B2P to BN (MAX1665S)..........................................-0.3V to +12V

B3P to BN (MAX1665V)..........................................-0.3V to +18V

B4P to BN (MAX1665X)..........................................-0.3V to +24V

Continuous Power Dissipation (T

A

= +70°C)

8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Temperature Range...........................................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

MAX1665SESA, V

B1P

= 4V nA

310

MAX1665X

MAX1665V

MAX1665S

V

PKN

= ±300mV

V

PKN

= ±300mV

(Note 1)

V

CHG

= V

PKN

+ 3.0V

CHG = PKN, DSG = BN

Cell voltage rising

I

DSG

= -1µA

VBN- V

PKN

MAX1665X, I

OUT

= 100µA, V

B4P

= 24V,

VBN= 100mV

CONDITIONS

I

BIAS

Input Bias Current (Note 3)

MAX1665VESA, V

B1P

= 4V, V

B2P

= 8V

nA

310

MAX1665XESA, V

B1P

= 4V, V

B2P

= 8V,

V

B3P

= 12V

310

ms

135

t

OFF

Overcurrent Sampling - t

OFF

ms

8.2

t

ON

Overcurrent Sampling - t

ON

mA

0.5 2

I

OL

CHG Output Sink Current

mA

10 25

I

OH

CHG, DSG Output Source Current

V

VBN+ 0.1

V

DSGL

DSG Output Voltage Low

V

17 20

DSG Output Voltage High (Note 2)

V

420

V

B4P

B4P Voltage Range

V

4 15

V

B3P

V

410

V

B2P

B2P Voltage Range

B3P Voltage Range

ms

10

t

IO

Overcurrent Detection Delay

ms

200

t

UV

Overvoltage/Undervoltage Delay

mV

5

V

CH2

Overcurrent Hysteresis

mV

±200 ±250 ±300

V

CH

Overcurrent Sense Threshold

V

4.26 4.3 4.34

V

OV

Overvoltage Threshold

V

0.10

V

CE

Overvoltage Hysteresis

V

2.4 2.5 2.6

V

UV

Undervoltage Threshold

mV

0 18 30

V

RE

Undervoltage RESET

UNITSMIN TYP MAXSYMBOLPARAMETER

I

OUT

= 100µA V

V

B2P

- 1.8 V

B2P

- 0.54

CHG, DSG Output Voltage High

I

CHG

= -100µA V

V

B3P

- 1.8 V

B3P

- 0.54

MAX1665S

MAX1665V

V

PKN

+ 0.1

V

CHGL

V

B4P

- 1.8 V

B4P

- 0.54

MAX1665X

CHG Output Voltage Low

V

DSG

= V

BN

+ 3.0V µA

0.5 2

I

OL

DSG Output Sink Current

MAX1665S/V/X

Lithium-Ion Battery Pack Protector

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(V

B2P

= 8V (MAX1665S), V

B3P

= 12V (MAX1665V), V

B4P

= 16V (MAX1665X), TA= 0°C to +85°C, unless otherwise noted. Typical

values are at T

A

= +25°C.)

ELECTRICAL CHARACTERISTICS

(V

B2P

= 8V (MAX1665S), V

B3P

= 12V (MAX1665V), V

B4P

= 16V (MAX1665X), TA= -40°C to +85°C, unless otherwise noted.) (Note 6)

Note 1: Applies to the differential voltage measured on any cell. Note 2: DSG is internally clamped to a maximum of 20V to protect the external MOSFET (V

GS

).

Note 3: Guaranteed by design. Note 4: The input bias matching between cells is measured with a 4V voltage between cells. Note 5: At least one cell is <V

UV

.

Note 6: Specifications to -40°C are guaranteed by design, not production tested.

MAX1665SESA, V

B1P

= 4V

nA

10

MAX1665X

DSG = CHG = low

MAX1665V

MAX1665S

V

DSG

= VBN+ 0.3V

V

CHG

= V

PKN

+ 0.3V

CHG = PKN, DSG = BN

Cell voltage rising

I

DSG

= -1µA

VBN- V

PKN

MAX1665X, I

OUT

= 100µA, V

B4P

= 24V,

VBN= 100mV

CONDITIONS

I

BIAS

Input Bias Current (Note 3)

MAX1665VESA, V

B1P

= 4V, V

B2P

= 8V

10

MAX1665XESA, V

B1P

= 4V, V

B2P

= 8V,

V

B3P

= 12V

10

V

4.7

V

UVLO

Undervoltage Lockout

µA

30

I

CC

Supply Current

µA

0.2

I

OL

DSG Output Sink Current

mA

0.2

I

OL

CHG Output Sink Current

mA

10

I

OH

CHG, DSG Output Source Current

V

VBN+ 0.1

V

DSGL

DSG Output Voltage Low

V

20

DSG Output Voltage High (Note 2)

V

420

V

B4P

B4P Voltage Range

V

4 15

V

B3P

V

410

V

B2P

B2P Voltage Range

B3P Voltage Range

mV

±180 ±320

V

CH

Overcurrent Sense Threshold

V

4.20 4.24

V

OV

Overvoltage Threshold

V

2.4 2.6

V

UV

Undervoltage Threshold

mV

0 30

V

RE

Undervoltage RESET

UNITSMIN TYP MAXSYMBOLPARAMETER

I

OUT

= 100µA V

V

B2P

- 2 V

B2P

- 0.5

CHG, DSG Output Voltage High

I

CHG

= -100µA V

V

B3P

- 2 V

B3P

- 0.5

MAX1665S

MAX1665V

V

PKN

+ 0.1

V

CHGL

V

B4P

- 2 V

B4P

- 0.5

MAX1665X

CHG Output Voltage Low

(Note 5) µA

2

I

LP

Standby Mode Current

DSG = CHG = low

(Note 5)

CONDITIONS

(Notes 3, 4) pA

±500

∆I

BIAS

V

4.0 4.7

V

UVLO

Undervoltage Lockout

µA

0.7 1

I

LP

Standby Mode Current

µA

16 25

I

CC

Supply Current

UNITSMIN TYP MAXSYMBOLPARAMETER

Input Bias Current Matching

MAX1665S/V/X

Lithium-Ion Battery Pack Protector

4 _______________________________________________________________________________________

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

4.14

4.18

4.26

4.22

4.30

4.34

-40 10-15 35 60 85

OVERVOLTAGE THRESHOLD vs.

TEMPERATURE

MAX1665 toc01

TEMPERATURE (°C)

THRESHOLD VOLTAGE (V)

VBN

- V

PKN

HYSTERESIS

2.46

2.47

2.49

2.48

2.50

2.51

-40 10-15 35 60 85

UNDERVOLTAGE THRESHOLD vs.

TEMPERATURE

MAX1665 toc02

TEMPERATURE (°C)

UNDERVOLTAGE THRESHOLD (V)

V

BN

- V

PKN

240

243

249

246

252

255

-40 10-15 35 60 85

OVERCURRENT THRESHOLD vs.

TEMPERATURE

MAX1665 toc03

TEMPERATURE (°C)

OVERCURRENT THRESHOLD (mV)

VBN - V

PKN

-260

-254

-256

-258

-252

-250

-248

-246

-244

-242

-240

-40 10-15 35 60 85

OVERDISCHARGE THRESHOLD

vs. TEMPERATURE

MAX1665 toc04

TEMPERATURE (°C)

OVERDISCHARGE THRESHOLD (mV)

V

BN - VPKN

16.0

16.4

17.2

16.8

17.6

18.0

2.5 3.53.0 4.0 4.5 5.0

QUIESCENT CURRENT vs. SUPPLY VOLTAGE

MAX1665 toc07

SUPPLY VOLTAGE PER CELL (V)

QUIESCENT CURRENT (µA)

NORMALIZED TO ONE CELL

16.0

16.5

17.0

17.5

18.0

SUPPLY CURRENT

vs. TEMPERATURE

MAX1665 toc05

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

-40 20 40-20 0 60 80 100

0.5

0.6

0.8

0.7

0.9

1.0

-40 0-20 20 40 60 80 100

STANDBY MODE CURRENT

vs. TEMPERATURE

MAX1665 toc06

TEMPERATURE (°C)

STANDBY CURRENT (µA)

CHG

2V/div

50ms/div

CONTINUOUS OVERCHARGE CONDITION

MAX1665 toc08

DSG

2V/div

50ms/div

CONTINUOUS OVERDISCHARGE CONDITION

MAX1665 toc09