LT8391HFE#TRPBF datasheet, PDF

FEATURES

n

LT8391

60V Synchronous 4-Switch

Buck-Boost LED Controller

with Spread Spectrum

DESCRIPTION

The

LT

®

8391

is a synchronous 4-switch buck-boost LED

controller that regulates LED current from input voltage

above, below or equal to the output voltage. The propri-

etary peak-buck peak-boost current mode control scheme

allows adjustable and synchronizable 150kHz to 650kHz

fixed frequency operation, or internal ±15% triangle spread

spectrum operation for low EMI. With 4V to 60V input, 0V

to 60V output, and seamless low noise transitions between

operation regions, the LT8391 is ideal for LED driver and

battery charger applications in automotive, industrial and

battery-powered systems.

The LT8391 provides both internal (up to 128:1) and

external (up to 2000:1) LED current PWM dimming with

a high side PMOS switch. Two CTRL pins provide flexible

20:1 analog dimming with ±3% LED current accuracy at

100mV full scale. Fault protection is provided to detect

an open or short LED condition, during which the LT8391

retries, latches off, or keeps running.

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

4-Switch Single Inductor Architecture Allows V

IN

Above, Below or Equal to V

OUT

Synchronous Switching: Up to 98% Efﬁciency

Proprietary Peak-Buck Peak-Boost Current Mode

Wide V

IN

Range: 4V to 60V

Wide V

OUT

Range: 0V to 60V (51V LED)

±3% LED Current Accuracy

2000:1 External and 128:1 Internal PWM Dimming

High Side PMOS PWM Switch Driver

Integrated Bootstrap Diodes

No Top MOSFET Refresh Noise in Buck or Boost

Adjustable and Synchronizable: 150kHz to 650kHz

Flicker-Free Spread Spectrum for Low EMI

Open and Short LED Protection with Fault Reporting

Available in 28-Lead TSSOP with Exposed Pad and

28-Lead QFN (4mm × 5mm)

APPLICATIONS

n

Automotive Head Lamps/Running Lamps

High Power LED Lighting

TYPICAL APPLICATION

98% Efficient 50W (25V, 2A) Buck-Boost LED Driver

V

IN

6V TO 55V

499k

100

33µF

63V

EN/UVLO

INTV

CC

100k

4.7µF

FAULT

V

REF

0.47µF

ANALOG DIM

PWM DIM

100k

CTRL2

LT8391

V

IN

BST1

TG1

SW1

LSP

LSN

BG1

GND

BG2

SW2

TG2

BST2

FB

V

OUT

ISP

ISN

PWMTG

8391 TA01a

Efficiency vs V

IN

98

1M

EFFICIENCY (%)

0.05

96

94

92

90

88

86

84

82

BUCK-BOOST

BOOST

BUCK

4.7µF

100V

x2

10µF

50V

x2

221k

FAULT

0.1µF

0.004

0.1µF

10µH

34.8k

100k

400kHz

2.2k

10nF

0.1µF

CTRL1

PWM

RP

SYNC/SPRD

RT

V

C

SS

5.1

25V

2A

LED

80

0

10

30

20

40

INPUT VOLTAGE (V)

50

60

8391 TA01b

8391fa

For more information

www.linear.com/LT8391

1

LT8391

ABSOLUTE MAXIMUM RATINGS

(Note 1)

V

IN

, EN/UVLO, V

OUT

, ISP, ISN ...................................60V

(ISP-ISN) .........................................................–1V to 1V

BST1, BST2 ...............................................................66V

SW1, SW2, LSP, LSN .................................... –6V to 60V

INTV

CC

, (BST1-SW1), (BST2-SW2) .............................6V

(BST1-LSP), (BST1-LSN) ............................................6V

FB, PWM, SYNC/SPRD, CTRL1, CTRL2,

FAULT

...........6V

Operating Junction Temperature Range (Notes 2, 3)

LT8391E ............................................. –40°C to 125°C

LT8391I.............................................. –40°C to 125°C

LT8391H ............................................ –40°C to 150°C

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

PIN CONFIGURATION

TOP VIEW

BST1

BST2

CTRL2

SW1

SW2

22 TG2

21 V

OUT

20 PWMTG

29

GND

19 SYNC/SPRD

18 RT

17 V

C

16 FB

15 SS

9 10 11 12 13 14

V

REF

CTRL1

ISP

ISN

FAULT

BG1

BG2

28 BG2

27 BST2

26 SW2

25 TG2

24 V

OUT

23 PWMTG

22 SYNC/SPRD

21 RT

20 V

C

19 FB

18 SS

17

FAULT

16 CTRL2

15 ISN

BG1

BST1

SW1

TG1

LSP

LSN

V

IN

INTV

CC

EN/UVLO

1

2

3

4

5

6

7

8

9

29

GND

28 27 26 25 24 23

TG1 1

LSP 2

LSN 3

V

IN

4

INTV

CC

5

EN/UVLO 6

RP 7

PWM 8

RP 10

PWM 11

V

REF

12

CTRL1 13

ISP 14

FE PACKAGE

28-LEAD PLASTIC TSSOP

θ

JA

= 30°C/W,

θ

JC

= 5°C/W

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

UFD PACKAGE

28-LEAD (4mm

×

5mm) PLASTIC QFN

θ

JA

= 34°C/W,

θ

JC

= 3.4°C/W

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

ORDER INFORMATION

(http://www.linear.com/product/LT8391#orderinfo)

LEAD FREE FINISH

LT8391EFE#PBF

LT8391IFE#PBF

LT8391HFE#PBF

LT8391EUFD#PBF

LT8391IUFD#PBF

LT8391HUFD#PBF

TAPE AND REEL

LT8391EFE#TRPBF

LT8391IFE#TRPBF

LT8391HFE#TRPBF

LT8391EUFD#TRPBF

LT8391IUFD#TRPBF

LT8391HUFD#TRPBF

PART MARKING*

LT8391FE

8391

PACKAGE DESCRIPTION

28-Lead Plastic TSSOP

28-Lead (4mm × 5mm) Plastic QFN

TEMPERATURE RANGE

–40°C to 125°C

–40°C to 150°C

–40°C to 125°C

–40°C to 150°C

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

For more information on lead free part marking, go to:

http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to:

http://www.linear.com/tapeandreel/.

Some packages are available in 500 unit reels through

designated sales channels with #TRMPBF suffix.

8391fa

2

For more information

www.linear.com/LT8391

LT8391

The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. (Note 2). V

IN

= 12V, V

EN/UVLO

= 1.5V unless otherwise noted.

SYMBOL PARAMETER

V

IN

Operating Voltage Range

V

IN

Quiescent Current

V

OUT

Voltage Range

V

OUT

Quiescent Current

Linear Regulators

INTV

CC

Regulation Voltage

INTV

CC

Load Regulation

INTV

CC

Line Regulation

INTV

CC

Current Limit

INTV

CC

Dropout Voltage (V

IN

– INTV

CC

)

INTV

CC

Undervoltage Lockout Threshold

INTV

CC

Undervoltage Lockout Hysteresis

V

REF

Regulation Voltage

V

REF

Load Regulation

V

REF

Line Regulation

V

REF

Current Limit

V

REF

Undervoltage Lockout Threshold

V

REF

Undervoltage Lockout Hysteresis

Control Inputs/Outputs

EN/UVLO Shutdown Threshold

EN/UVLO Enable Threshold

EN/UVLO Enable Hysteresis

EN/UVLO Hysteresis Current

V

EN/UVLO

= 0.3V

V

EN/UVLO

= 1.1V

V

EN/UVLO

= 1.3V

V

CTRL1/2

= 0.75V (Note 4), Current out of

Falling

l

ELECTRICAL CHARACTERISTICS

CONDITIONS

l

MIN

4

TYP

1

270

2.1

MAX

60

2

2.8

60

0.5

60

5.15

4

160

3.64

2.03

1

0.2

3.2

1.90

UNITS

V

µA

mA

V

µA

V

%

mA

mV

V

%

mA

V

mV

V

EN/UVLO

= 0.3V

V

EN/UVLO

= 1.1V

Not Switching

l

0

0.1

40

5.0

1

80

3.44

110

160

3.54

0.24

2.00

0.4

0.1

2

1.78

2.5

1.84

50

0.3

1.190

–0.1

2.2

–0.1

0

190

0.6

1.214

13

0

2.5

0

20

200

28

V

EN/UVLO

= 0.3V, V

OUT

= 12V

V

EN/UVLO

= 1.1V, V

OUT

= 12V

Not Switching, V

OUT

= 12V

I

INTVCC

= 20mA

I

INTVCC

= 0mA to 80mA

I

INTVCC

= 20mA, V

IN

= 6V to 60V

V

INTVCC

= 4.5V

I

INTVCC

= 20mA, V

IN

= 4V

Falling

I

VREF

= 100µA

I

VREF

= 0mA to 1mA

I

VREF

= 100µA, V

IN

= 4V to 60V

V

REF

= 1.8V

Falling

l

20

4.85

1.97

1.0

1.238

0.1

2.8

0.1

50

210

V

mV

µA

nA

mV

Falling

l

CTRL1, CTRL2 Input Bias Current

CTRL1, CTRL2 Dim-Off Threshold

CTRL1, CTRL2 Dim-Off Hysteresis

PWM Dimming

External PWM Dimming Threshold

External PWM Dimming Hysteresis

Internal PWM Dimming Duty Cycle

Rising, R

P

= 30k

R

P

= 30k

V

PWM

= 1V, R

P

≥ 51k

V

PWM

= 1.5V, R

P

≥ 51k

V

PWM

= 2V, R

P

≥ 51k

R

P

= 51k

R

P

= 82k

R

P

= 130k

R

P

= 200k

R

P

= 300k

l

1.3

1.4

220

1.5

3

53

V

mV

%

47

97

256

512

1024

2048

4096

Switching Frequency to Internal PWM Dimming

Frequency Ratio

8391fa

For more information

www.linear.com/LT8391

3

LT8391

The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. (Note 2). V

IN

= 12V, V

EN/UVLO

= 1.5V unless otherwise noted.

SYMBOL PARAMETER

RP Pin Current Limit

Minimum V

OUT

for PWMTG to be On

PWMTG On Voltage V

(VOUT-PWMTG)

PWMTG Off Voltage V

(VOUT-PWMTG)

PWM to PWMTG Turn On Propagation Delay

PWM to PWMTG Turn Off Propagation Delay

PWMTG Turn On Fall Time

PWMTG Turn Off Rise Time

Error Amplifier

Full Scale LED Current Regulation V

(ISP-ISN)

9/10th LED Current Regulation V

(ISP-ISN)

1/2 LED Current Regulation V

(ISP-ISN)

1/20th LED Current Regulation V

(ISP-ISN)

Zero Scale LED Current Regulation V

(ISP-ISN)

ISP/ISN Input Common Mode Range

ISP/ISN Low Side to High Side Switchover

Voltage

ISP/ISN High Side to Low Side Switchover

Voltage

ISP Input Bias Current

V

ISP

= V

ISN

V

ISP

= V

ISN

V

PWM

= 5V, V

ISP

= V

ISN

= 12V

V

PWM

= 5V, V

ISP

= V

ISN

= 0V

V

EN/UVLO

= 0V, V

ISP

= V

ISN

= 12V or 0V

V

PWM

= 5V, V

ISP

= V

ISN

= 12V

V

PWM

= 5V, V

ISP

= V

ISN

= 0V

V

EN/UVLO

= 0V, V

ISP

= V

ISN

= 12V or 0V

V

C

= 1.2V

V

IN

= 4V to 60V

l

ELECTRICAL CHARACTERISTICS

CONDITIONS

V

RP

= 0V, Current out of Pin

PWM dimming on

V

OUT

= 12V

V

OUT

= 12V

C

PWMTG

= 3.3nF to V

OUT

, 50% to 50%

C

PWMTG

= 3.3nF to V

OUT

, 50% to 50%

C

PWMTG

= 3.3nF to V

OUT

, 10% to 90%

C

PWMTG

= 3.3nF to V

OUT

, 90% to 10%

V

CTRL1/2

≥ 1.35V (Note 4), V

ISP

= 12V

V

CTRL1/2

≥ 1.35V (Note 4), V

ISP

= 0V

V

CTRL1/2

= 1.15V (Note 4), V

ISP

= 12V

V

CTRL1/2

= 1.15V (Note 4), V

ISP

= 0V

V

CTRL1/2

= 0.75V (Note 4), V

ISP

= 12V

V

CTRL1/2

= 0.75V (Note 4), V

ISP

= 0V

V

CTRL1/2

= 0.30V (Note 4), V

ISP

= 12V

V

CTRL1/2

= 0.30V (Note 4), V

ISP

= 0V

V

CTRL1/2

= 0.25V (Note 4), V

ISP

= 12V

V

CTRL1/2

= 0.25V (Note 4), V

ISP

= 0V

l

MIN

TYP

40

2.4

MAX

3

5.4

0.1

UNITS

µA

V

ns

4.6

–0.1

5

0

90

40

300

10

97

87

47.5

3

–2

0

100

90

50

5

0

1.8

1.7

23

–10

0

23

–10

0

2000

103

93

52.5

7

2

60

mV

V

µA

µS

ISN Input Bias Current

LED Current Regulation Amplifier g

m

FB Regulation Voltage

FB Line Regulation

FB Load Regulation

FB Voltage Regulation Amplifier g

m

FB Input Bias Current

V

C

Output Impedance

V

C

Standby Leakage Current

V

C

= 1.2V, PWM Dimming Off

–10

FB in Regulation, Current Out of Pin

0.98

1.00

0.2

660

10

0

1.02

0.5

0.8

40

10

V

%

µS

nA

M

nA

8391fa

4

For more information

www.linear.com/LT8391

LT8391

The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. (Note 2). V

IN

= 12V, V

EN/UVLO

= 1.5V unless otherwise noted.

SYMBOL PARAMETER

Current Comparator

Maximum Current Sense Threshold V

(LSP-LSN)

Reverse Current Sense Threshold V

(LSP-LSN)

LSP Pin Bias Current

LSN Pin Bias Current

Fault

FB Overvoltage Threshold (V

FB

)

FB Overvoltage Hysteresis

FB Open LED Threshold (V

FB

)

FB Open LED Hysteresis

FB Short LED Threshold (V

FB

)

FB Short LED Hysteresis

ISP/ISN Over Current Threshold V

(ISP-ISN)

ISP/ISN Open LED Threshold V

(ISP-ISN)

ISP/ISN Open LED Hysteresis

FAULT

Pull-Down Resistance

SS Hard Pull-Down Resistance

SS Pull-Up Current

SS Pull-Down Current

SS Fault Latch-Off Threshold

SS Fault Latch-Off Hysteresis

SS Fault Reset Threshold

Oscillator

RT Pin Voltage

Switching Frequency

R

T

= 100k

V

SYNC/SPRD

= 0V, R

T

= 226k

V

SYNC/SPRD

= 0V, R

T

= 100k

V

SYNC/SPRD

= 0V, R

T

= 59.0k

V

SYNC/SPRD

= 5V

V

SYNC/SPRD

= 5V

V

SYNC/SPRD

= 5V

l

ELECTRICAL CHARACTERISTICS

CONDITIONS

Buck, V

FB

= 0.8V

Boost, V

FB

= 0.8V

Buck, V

FB

= 0.8V

Boost, V

FB

= 0.8V

V

LSP

= V

LSN

= 12V

V

LSP

= V

LSN

= 12V

Rising

Rising, V

(ISP-ISN)

= 0V

V

(ISP-ISN)

= 0V

Falling

Hysteresis

V

ISP

= 12V

Falling, V

FB

= 1.0V

V

FB

= 1.0V

V

EN/UVLO

= 1.1V

V

FB

= 0.8V, V

SS

= 0V

V

FB

= 1.0V, V

SS

= 2V

Falling

l

MIN

35

40

TYP

50

–4

60

MAX

65

60

UNITS

mV

µA

1.03

15

0.93

35

0.24

35

8

3

1.05

25

0.95

50

0.25

50

750

10

5

100

1.07

35

0.97

65

0.26

65

12

7

200

14.5

1.45

V

mV

V

mV

V

mV

10.5

1.05

12.5

1.25

1.7

50

0.2

1.00

µA

V

mV

V

190

380

570

150

–0.1

0.4

12.5

–17.7

200

400

600

0

14.5

–15.7

210

420

630

650

0.1

1.5

16.5

–13.7

kHz

µA

V

%

SYNC Frequency

SYNC/SPRD Input Bias Current

SYNC/SPRD Threshold Voltage

Highest Spread Spectrum Above Oscillator

Frequency

Lowest Spread Spectrum Below Oscillator

Frequency

8391fa

For more information

www.linear.com/LT8391

5

Parameter Name	Attribute value
Maker	ADI
Product Category	LED lighting driver
Number of channels	1 Channel
Output current	10 A
Input voltage	4 V to 60 V
working frequency	600 kHz
Supply current—max.	2.8 mA
Minimum operating temperature	- 40 C
Maximum operating temperature	+ 150 C
Installation style	SMD/SMT
Package/box	TSSOP-28
Number of outputs	1 Output
series	LT8391
Encapsulation	Reel
product	LED Controllers
type	Synchronous Buck-Boost LED Controller
Topology	Buck-Boost
Factory packaging quantity	2000

	LT8391HFE#TRPBF	LT8391EUFD#PBF	LT8391HUFD#TRPBF	LT8391EUFD#TRPBF	LT8391IUFD#TRPBF	LT8391HUFD#PBF	LT8391IUFD#PBF	LT8391IFE#TRPBF	LT8391EFE#TRPBF
Description	LED Lighting Driver 60V Synchronous 4-Switch Buck-Boost LED Controller with Spread Spectrum	LED Lighting Drivers 60V Synchronous 4-Switch Buck-Boost LED Controller with Spread Spectrum	LED Lighting Drivers 60V Synchronous 4-Switch Buck-Boost LED Controller with Spread Spectrum	LED Lighting Drivers 60V Synchronous 4-Switch Buck-Boost LED Controller with Spread Spectrum	LED Lighting Drivers 60V Synchronous 4-Switch Buck-Boost LED Controller with Spread Spectrum	LED Lighting Drivers 60V Synchronous 4-Switch Buck-Boost LED Controller with Spread Spectrum	LED Lighting Driver 60V Synchronous 4-Switch Buck-Boost LED Controller with Spread Spectrum	LED Lighting Driver 60V Synchronous 4-Switch Buck-Boost LED Controller with Spread Spectrum	LED Lighting Driver 60V Synchronous 4-Switch Buck-Boost LED Controller with Spread Spectrum
Product Category	LED lighting driver	LED Lighting Drivers	LED Lighting Drivers	LED Lighting Drivers	LED Lighting Drivers	LED Lighting Drivers	LED lighting driver	LED lighting driver	LED lighting driver
Topology	Buck-Boost	Buck-Boost	Buck-Boost	Buck-Boost	Buck-Boost	Buck-Boost	Buck-Boost	Buck-Boost	Buck-Boost
Product Attribute	-	Attribute Value	Attribute Value	Attribute Value	Attribute Value	Attribute Value	-	-	-
Manufacturer	-	ADI	ADI	ADI	ADI	ADI	-	-	-
RoHS	-	Details	Details	Details	Details	Details	-	-	-
Number of Channels	-	1 Channel	1 Channel	1 Channel	1 Channel	1 Channel	-	-	-
Output Current	-	10 A	10 A	10 A	10 A	10 A	-	-	-
Input Voltage	-	4 V to 60 V	4 V to 60 V	4 V to 60 V	4 V to 60 V	4 V to 60 V	-	-	-
Operating Frequency	-	650 kHz	600 kHz	650 kHz	650 kHz	600 kHz	-	-	-
Supply Current - Max	-	2.8 mA	2.8 mA	2.8 mA	2.8 mA	2.8 mA	-	-	-
Minimum Operating Temperature	-	- 40 C	- 40 C	- 40 C	- 40 C	- 40 C	-	-	-
Maximum Operating Temperature	-	+ 125 C	+ 150 C	+ 125 C	+ 125 C	+ 150 C	-	-	-
Mounting Style	-	SMD/SMT	SMD/SMT	SMD/SMT	SMD/SMT	SMD/SMT	-	-	-
Package / Case	-	QFN-28	QFN-28	QFN-28	QFN-28	QFN-28	-	-	-
Number of Outputs	-	1 Output	1 Output	1 Output	1 Output	1 Output	-	-	-
Packaging	-	Tube	Reel	Reel	Reel	Tube	-	-	-
Product	-	LED Controllers	LED Controllers	LED Controllers	LED Controllers	LED Controllers	-	-	-
Type	-	Buck-Boost LED Drivers	Synchronous Buck-Boost LED Controller	Buck-Boost LED Drivers	Buck-Boost LED Drivers	Synchronous Buck-Boost LED Controller	-	-	-
Factory Pack Quantity	-	146	2500	2500	2500	146	-	-	-

LT8391HFE#TRPBF

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