LTC4162IUFD-FAD#PBF datasheet, PDF

FEATURES

n

LTC4162-F

35V/3.2A Multicell

LiFePO

4

Step-Down Battery Charger

with PowerPath and I

2

C Telemetry

DESCRIPTION

The

LTC

®

4162-F

is an advanced monolithic synchronous

step-down switching battery charger and PowerPath

™

manager that seamlessly manages power distribution

between input sources such as wall adapters, backplanes,

solar panels, etc., and a rechargeable lithium iron phos-

phate battery.

A high resolution measurement system provides exten-

sive telemetry information for circuit voltages, currents,

battery resistance and temperature which can all be read

back over the I

2

C port. The I

2

C port can also be used to

configure many charging parameters including charging

voltages and currents, termination algorithms and numer-

ous system status alerts.

The LTC4162-F can charge LiFePO

4

cell stacks from 1 cell

to 9 cells with as much as 3.2A of charge current.

The power path topology decouples the output voltage

from the battery allowing a portable product to start up

instantly under very low battery voltage conditions.

The LTC4162-F is available in a thermally enhanced 28-

pin 4mm × 5mm × 0.75mm QFN surface mount package.

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

n

LiFePO

4

Battery Charger with Termination

Wide Charging Input Voltage Range: 4.5V to 35V

High Efficiency Synchronous Operation

16-Bit Digital Telemetry System Monitors V

BAT

,

I

BAT

, R

BAT

, T

BAT

, T

DIE

, V

IN

, I

IN

, V

OUT

Charges 1-9 Lithium Iron Phosphate Cells

Input Undervoltage Charge Current Limit Loop

Input MPPT for Solar Panel Inputs

Input Current Limit Prioritizes System Load Output

Low Loss PowerPath™

Instant-On Operation with Discharged or Missing

Battery

JEITA Temperature Controlled Charging

Pin Compatible with Li-Ion and SLA Versions

APPLICATIONS

n

Medical Instruments

USB-C Power Delivery

Industrial Handhelds

Ruggedized Notebooks

Tablet Computers

TYPICAL APPLICATION

1-9 Cell, 3.2A Step-Down Switching Battery Charger with PowerPath

V

IN

V

IN

INFET CLP

I

2

C

CLN V

OUT

BATFET

SW

CSP

LTC4162-F

CELL

COUNT

CSN

BATSENS+

NTCBIAS

NTC

GND

T

EFFICIENCY (%)

V

OUT

Charging Efficiency vs Input Voltage by Cell Count

100

I

CHARGE

= 2.5A

95

90

85

1 CELL

2 CELLS

3 CELLS

4 CELLS

5 CELLS

6 CELLS

5

10

15

20

80

75

7 CELLS

8 CELLS

9 CELLS

25

30

35

INPUT VOLTAGE (V)

4162F TA01a

4162F TA01b

Rev A

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1

LTC4162-F

TABLE OF CONTENTS

Features ............................................................................................................................ 1

Applications ....................................................................................................................... 1

Typical Application ............................................................................................................... 1

Description......................................................................................................................... 1

Absolute Maximum Ratings ..................................................................................................... 3

Order Information ................................................................................................................. 3

Pin Configuration ................................................................................................................. 3

Electrical Characteristics ........................................................................................................ 4

Typical Performance Characteristics .......................................................................................... 7

Pin Functions .....................................................................................................................10

Block Diagram....................................................................................................................12

ESD Diagram .....................................................................................................................13

Timing Diagram ..................................................................................................................14

Operation..........................................................................................................................15

Applications Information .......................................................................................................29

Register Descriptions ...........................................................................................................36

Typical Applications .............................................................................................................48

Package Description ............................................................................................................50

Revision History .................................................................................................................51

Typical Application ..............................................................................................................52

Related Parts .....................................................................................................................52

Rev A

2

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LTC4162-F

ABSOLUTE MAXIMUM RATINGS

(Note 1)

PIN CONFIGURATION

TOP VIEW

PGND

SCL

PGND

22 BATFET

21 CSP

20 CSN

AGND

29

19 BATSENS+

18 CELLS1

17 CELLS0

16 SYNC

15 DV

CC

9 10 11 12 13 14

NTCBIAS

SMBALERT

SDA

NTC

R

T

V

OUT

V

OUT

SW

BATSENS+, V

IN

, CSP, CSN, CLP,

CLN, V

OUT

, V

OUTA

.................................. −0.3V to 36V

CSP to CSN, CLP to CLN ........................................±0.3V

CELLSO, CELLS1, SYNC ..................... −0.3V to INTVCC

DV

CC

......................................................... −0.3V to 5.5V

SDA, SCL,

SMBALERT

............................. −0.3V to DV

CC

I

SW

....................................................................... ±3.5A

Operating Junction Temperature Range

(Notes 2, 4) ............................................ −40 to 125°C

Storage Temperature Range ...................... −65 to 150°C

28 27 26 25 24 23

BOOST 1

INTV

CC

2

V

OUTA

3

CLN 4

CLP 5

INFET 6

V

IN

7

VCC2P5 8

UFD PACKAGE

28-LEAD (4mm

×

5mm) PLASTIC QFN

T

JMAX

= 125°C,

θ

JA

= 43°C/W,

θ

JC

= 3.4°C/W

EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB

ORDER INFORMATION

PART NUMBER

LTC4162EUFD-FAD#PBF

LTC4162EUFD-FST#PBF

LTC4162EUFD-FFS#PBF

LTC4162EUFD-FADM#PBF

LTC4162EUFD-FSTM#PBF

LTC4162EUFD-FFSM#PBF

LTC4162EUFD-FAD#TRPBF

LTC4162EUFD-FST#TRPBF

LTC4162EUFD-FFS#TRPBF

LTC4162EUFD-FADM#TRPBF

LTC4162EUFD-FSTM#TRPBF

LTC4162EUFD-FFSM#TRPBF

LTC4162IUFD-FAD#PBF

LTC4162IUFD-FST#PBF

LTC4162IUFD-FFS#PBF

LTC4162IUFD-FADM#PBF

PART

MARKING*

4162E

4162G

4162F

4162P

4162S

4162R

4162E

4162G

4162F

4162P

4162S

4162R

4162E

4162G

4162F

4162P

✓

TAPE AND

REEL

TEMP

GRADE

E

I

DESCRIPTION

I

2

C Adjustable Voltage

3.6V Fixed Voltage

3.8V Rapid Charge

I

2

C Adjustable Voltage MPPT ON

3.6V Fixed Voltage MPPT ON

3.8V Rapid Charge MPPT ON

I

2

C Adjustable Voltage

3.6V Fixed Voltage

3.8V Rapid Charge

I

2

C Adjustable Voltage MPPT ON

3.6V Fixed Voltage MPPT ON

3.8V Rapid Charge MPPT ON

I

2

C Adjustable Voltage

3.6V Fixed Voltage

3.8V Rapid Charge

I

2

C Adjustable Voltage MPPT ON

TEMPERATURE

RANGE

–40°C to 125°C

Rev A

For more information

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3

LTC4162-F

ORDER INFORMATION

PART NUMBER

LTC4162IUFD-FSTM#PBF

LTC4162IUFD-FFSM#PBF

LTC4162IUFD-FAD#TRPBF

LTC4162IUFD-FST#TRPBF

LTC4162IUFD-FFS#TRPBF

LTC4162IUFD-FADM#TRPBF

LTC4162IUFD-FSTM#TRPBF

LTC4162IUFD-FFSM#TRPBF

PART

MARKING*

4162S

4162R

4162E

4162G

4162F

4162P

4162S

4162R

✓

TAPE AND

REEL

TEMP

GRADE

I

DESCRIPTION

3.6V Fixed Voltage MPPT ON

3.8V Rapid Charge MPPT ON

I

2

C Adjustable Voltage

3.6V Fixed Voltage

3.8V Rapid Charge

I

2

C Adjustable Voltage MPPT ON

3.6V Fixed Voltage MPPT ON

3.8V Rapid Charge MPPT ON

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.

The

l

denotes the specifications which apply over the full specified

operating junction temperature range, otherwise specifications are at T

A

= 25°C (Note 4). V

IN

= 18V, DV

CC

= 3.3V, R

SNSI

= 10mΩ,

R

SNSB

= 10mΩ unless otherwise noted.

SYMBOL

V

IN

V

BAT

I

BATSENS

+

I

VIN

V

CHARGE

PARAMETER

Input Supply Voltage

Battery Voltage

Battery Drain Current

V

IN

– V

BATSENS

+ > V

IN_DUVLO

, Terminated

V

IN

– V

BATSENS

+ < V

IN_DUVLO

V

IN

= 0, SHIPMODE Activated

V

IN

– V

BATSENS

+ > V

IN_DUVLO

, Terminated

CONDITIONS

l

ELECTRICAL CHARACTERISTICS

MIN

4.5

2.7

TYP

MAX

35

UNITS

V

µA

V

mV

%

mV

V

mV

%

System Voltages and Currents

0.5

54

2.8

115

3.4125–3.8

12.5

1

100

5

200

V

IN

Drain Current

Range

Resolution (5 Bits)

Accuracy

Range

Resolution (5 Bits)

Accuracy

Range

Resolution (6 Bits)

Accuracy

Range

Resolution (8 Bits)

Full Scale Accuracy

Switching Battery Charger

Per

cell_count

l

–0.5

–1.5

0.5

1.5

I

CHARGE

Servo Voltage

(V

CSP

– V

CSN

)

I

INLIM

Servo Voltage

(V

CLP

– V

CLN

)

V

INLIM

I

CHARGE

= (V

CSP

– V

CSN

)/R

SNSB

Note 5

l

–0.25

–0.75

1–32

1

0.25

0.75

I

IN

= (V

CLP

– V

CLN

)/R

SNSI

Note 6

–0.2

0.5–32

0.5

0.14–36

140.625

0.2

–1

1

Rev A

4

For more information

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LTC4162-F

The

l

denotes the specifications which apply over the full specified

operating junction temperature range, otherwise specifications are at T

A

= 25°C (Note 4). V

IN

= 18V, DV

CC

= 3.3V, R

SNSI

= 10mΩ,

RSNSB = 10mΩ unless otherwise noted.

SYMBOL

f

OSC

D

MAX

R

SWITCH

R

RECT

I

PEAK

System Controls

V

IN_UVLO

V

IN_DUVLO

V

IN_OVLO

V

INTVCC_UVLO

V

IN

Charger Enable

Input Undervoltage Lockout

V

IN

to BATSENS+ Charger Enable

Differential Undervoltage Lockout

V

IN

Charger Disable

Overvoltage Lockout

INTV

CC

Telemetry Enable

Undervoltage Lockout

Resolution

Offset Error

Span Error

Resolution

Offset Error

Span Error

Resolution

Offset Error

Span Error

Resolution

Offset Error

Span Error

Resolution

Offset Error

Span Error

Resolution

Offset Error

Span Error

Resolution

Offset

Logic Reference Level

DV

CC

Current

I

2

C Address

Input High Threshold

Input Low Threshold

Digital Output Low (SDA/SMBALERT)

SCL Clock Frequency

I

SDA/SMBALERT

= 3mA

70

30

400

SCL/SDA = DV

CC

, 0kHz

l

ELECTRICAL CHARACTERISTICS

PARAMETER

Switching Frequency

Maximum Duty Cycle

Primary Switch On-Resistance

Rectifier Switch On-Resistance

Peak Inductor Current Limit

CONDITIONS

R

T

= 63.4k

l

MIN

1.4

TYP

1.5

99.5

90

MAX

1.6

UNITS

MHz

%

mΩ

A

Note 3

Rising Threshold

Hysteresis

Rising Threshold

Hysteresis

Rising Threshold

Hysteresis

Rising Threshold

Hysteresis

I

BAT

= (V

CSP

– V

CSN

)/R

SNSB

0.32mV < V

CSP

– V

CSN

< 32mV

I

IN

= (V

CLP

– V

CLN

)/R

SNSI

0.32mV < V

CLP

– V

CLN

< 32mV

3V < V

IN

< 35V

2V < V

BATSENS

+ < 3.8V

3V < V

OUT

< 35V

0 < V

NTC

/V

NTCBIAS

< 1

4.2

100

37.6

2.75

45mV/R

SNSB

4.4

0.2

150

170

38.6

1.4

2.85

0.12

1.466

4.6

200

40

2.95

V

mV

V

µV /LSB

mV

%rdng

µV/LSB

mV

%rdng

mV/LSB

mV

%rdng

µV/LSB

mV

%rdng

mV/LSB

mV

%rdng

µV/V/LSB

mV/V

%rdng

°C/LSB

°C

Telemetry A/D Measurement Subsystem

I

BAT

(V

CSP

– V

CSN

)

I

IN

(V

CLP

– V

CLN

)

V

IN

V

BATSENS

+

(Per

cell_count)

V

OUT

V

NTC

/V

NTCBIAS

T_die

–0.15

–1

–0.15

–1

–25

–1

–10

–1

–25

–1

0.15

1

0.15

1

25

1

10

1

25

1

1.466

1.649

192.4

1.653

45.833

0.0215

–264.4

1.8

0

0b1101000[R/W]

5.5

Serial Port, SDA, SCL,

SMBALERT

DV

CC

I

DVCCQ

ADDRESS

V

IHI2C

V

ILI2C

V

OLI2C

F

SCL

V

µA

% DV

CC

% DV

CC

mV

kHz

Rev A

For more information

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5

Parameter Name	Attribute value
Function	battery monitor
battery chemistry	polychemistry
Number of batteries	1 ~ 9
failsafe	Overcurrent, overtemperature, overvoltage
interface	I²C
Operating temperature	-40°C ~ 125°C
Package/casing	28-WFQFN Exposed Pad
Supplier device packaging	28-QFN（4x5）

LTC4162IUFD-FAD#PBF

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