LT8304ES8E#TRPBF datasheet, PDF

LT8304/LT8304-1

100V

IN

Micropower

No-Opto Isolated Flyback

Converter with 150V/2A Switch

FEATURES

n

DESCRIPTION

The

LT

®

8304/LT8304-1

are monolithic micropower iso-

lated flyback converters. By sampling the isolated output

voltage directly from the primary-side flyback waveform,

the parts require no third winding or opto-isolator for

regulation. The output voltage is programmed with two

external resistors and a third optional temperature com-

pensation resistor. Boundary mode operation provides a

small magnetic solution with excellent load regulation. Low

ripple Burst Mode operation maintains high efficiency at

light load while minimizing the output voltage ripple. A 2A,

150V DMOS power switch is integrated along with all the

high voltage circuitry and control logic into a thermally

enhanced 8-lead SO package.

The LT8304/LT8304-1 operate from an input voltage range

of 3V to 100V and deliver up to 24W of isolated output

power. The high level of integration and the use of boundary

and low ripple Burst Mode operation result in a simple to

use, low component count, and high efficiency applica-

tion solution for isolated power delivery. The LT8304-1 is

specially optimized for high step-up output applications.

L,

LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks

of Linear Technology Corporation. All other trademarks are the property of their respective

owners. Protected by U.S. Patents, including 5438499, 7463497, 7471522.

n

3V to 100V Input Voltage Range

2A, 150V Internal DMOS Power Switch

Low Quiescent Current:

n

116µA in Sleep Mode

n

390µA in Active Mode

Quasi-Resonant Boundary Mode Operation at

Heavy Load

Low Ripple Burst Mode

®

Operation at Light Load

Minimum Load < 0.5% (Typ) of Full Output

No Transformer Third Winding or Opto-Isolator

Required for Output Voltage Regulation

Accurate EN/UVLO Threshold and Hysteresis

Internal Compensation and Soft-Start

Temperature Compensation for Output Diode

Output Short-Circuit Protection

Thermally Enhanced 8-Lead SO Package

APPLICATIONS

n

Isolated Automotive, Industrial, Medical, Telecom

Power Supplies

Isolated Auxiliary/Housekeeping Power Supplies

TYPICAL APPLICATION

4V to 80V

IN

/5V

OUT

Isolated Flyback Converter

V

IN

4V TO 80V

V

IN

EN/UVLO

LT8304

GND

1µF

INTV

CC

R

FB

R

REF

100k

TC

10k

8304 TA01a

Efficiency vs Load Current

V

OUT+

5V

100

90

EFFICIENCY (%)

80

70

60

50

40

V

IN

= 24V

V

IN

= 48V

V

IN

= 72V

0

0.6

1.2 1.8 2.4 3.0

LOAD CURRENT (A)

3.6

4.2

220pF

10µF

100

SW

309k

40µH

6:1

•

1.1µH

•

100µF

×3

V

OUT–

20mA TO 2.4A (V

IN

= 24V)

20mA TO 3.6A (V

IN

= 48V)

20mA TO 4.2A (V

IN

= 72V)

8304 TA01b

8304fa

For more information

www.linear.com/LT8304

1

LT8304/LT8304-1

ABSOLUTE MAXIMUM RATINGS

(Note 1)

PIN CONFIGURATION

TOP VIEW

EN/UVLO 1

INTV

CC

2

V

IN

3

GND 4

9

GND

8

7

6

5

TC

R

REF

R

FB

SW

SW (Note 2) ............................................................150V

V

IN

..........................................................................100V

EN/UVLO ....................................................................V

IN

R

FB

........................................................V

IN

– 0.5V to V

IN

Current Into R

FB

....................................................200µA

INTV

CC

, R

REF

, TC.........................................................4V

Operating Junction Temperature T

J

Range (Notes 3, 4)

LT8304E/LT8304E-1 .......................... –40°C to 125°C

LT8304I/LT8304I-1 ............................ –40°C to 125°C

LT8304H/LT8304H-1 ......................... –40°C to 150°C

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

Lead Temperature (Soldering, 10 sec)................... 300°C

S8E PACKAGE

8-LEAD PLASTIC SO

θ

JA

= 33°C/W

EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB

ORDER INFORMATION

LEAD FREE FINISH

LT8304ES8E#PBF

LT8304IS8E#PBF

LT8304HS8E#PBF

LT8304ES8E-1#PBF

LT8304IS8E-1#PBF

LT8304HS8E-1#PBF

TAPE AND REEL

LT8304ES8E#TRPBF

LT8304IS8E#TRPBF

LT8304HS8E#TRPBF

LT8304ES8E-1#TRPBF

LT8304IS8I-1#TRPBF

LT8304HS8E-1#TRPBF

http://www.linear.com/product/LT8304#orderinfo

PART MARKING*

8304

83041

PACKAGE DESCRIPTION

8-Lead Plastic SO

TEMPERATURE RANGE

–40°C to 125°C

–40°C to 150°C

–40°C to 125°C

–40°C to 150°C

Consult LTC 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.

2

8304fa

For more information

www.linear.com/LT8304

LT8304/LT8304-1

The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. V

IN

= 24V, V

EN/UVLO

= V

IN

, C

INTVCC

= 1µF to GND, unless otherwise

noted.

SYMBOL

V

IN

I

Q

PARAMETER

V

IN

Voltage Range

V

IN

Quiescent Current

V

EN/UVLO

= 0.2V

V

EN/UVLO

= 1.1V

Sleep Mode (Switch Off)

Active Mode (Switch On)

For Lowest Off I

Q

Falling

V

EN/UVLO

= 0.2V

V

EN/UVLO

= 1.1V

V

EN/UVLO

= 1.3V

I

INTVCC

= 0mA to 10mA

V

INTVCC

= 2.8V

Falling

I

RFB

= 75µA to 125µA

l

ELECTRICAL CHARACTERISTICS

CONDITIONS

l

MIN

3

TYP

1.8

63

116

390

MAX

100

3

UNIT

V

µA

V

mV

µA

V

mA

V

mV

V

%

V

µA

kHz

ns

EN/UVLO Shutdown Threshold

EN/UVLO Enable Threshold

EN/UVLO Enable Hysteresis

I

HYS

V

INTVCC

I

INTVCC

EN/UVLO Hysteresis Current

0.2

1.178

–0.1

2.3

–0.1

2.8

2.38

–60

0.98

0.5

1.214

14

0

2.5

0

3

16

2.47

105

60

1.00

0.02

1.00

1.02

0.1

18

13

385

14

2.56

0.1

2.7

0.1

3.1

1.250

INTV

CC

Regulation Voltage

INTV

CC

Current Limit

INTV

CC

UVLO Threshold

INTV

CC

UVLO Hysteresis

(R

FB

– V

IN

) Voltage

R

REF

Regulation Voltage

R

REF

Regulation Voltage Line Regulation

3V ≤ V

IN

≤ 100V

V

TC

= 1.2V (LT8304)

V

TC

= 1.2V (LT8304-1)

V

TC

= 0.8V

l

V

TC

I

TC

f

MAX

f

MIN

t

ON(MIN)

I

SW(MAX)

I

SW(MIN)

R

DS(ON)

I

LKG

t

SS

TC Pin Voltage

TC Pin Current

12

7

315

8

(LT8304)

(LT8304-1)

2.0

0.43

I

SW

= 0.8A

V

SW

= 150V

15

10

–200

350

11

160

950

2.4

0.48

0.5

0.1

11

Maximum Switching Frequency

Minimum Switching Frequency

Minimum Switch-On Time

Maximum Switch Current Limit

Minimum Switch Current Limit

Switch On-Resistance

Switch Leakage Current

Soft-Start Timer

2.8

0.53

0.5

A

Ω

µA

ms

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 SW pin is rated to 150V for transients. Depending on the

leakage inductance voltage spike, operating waveforms of the SW pin

should be derated to keep the flyback voltage spike below 150V as shown

in Figure 5.

Note 3:

The LT8304E/LT8304E-1 are guaranteed to meet performance

specifications from 0°C to 125°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 LT8304I/LT8304I-1 are guaranteed over the full –40°C to 125°C

operating junction temperature range. LT8304H/LT304H-1 are guaranteed

over the full –40°C to 150°C operating junction temperature range. High

junction temperatures degrade operating lifetimes. Operating lifetime is

derated at junction temperature greater than 125°C.

Note 4:

The LT8304/LT8304-1 includes overtemperature protection that

is intended to protect the device during momentary overload conditions.

Junction temperature will exceed 150°C when overtemperature protection

is active. Continuous operation above the specified maximum operating

junction temperature may impair device reliability.

8304fa

For more information

www.linear.com/LT8304

3

LT8304/LT8304-1

TYPICAL PERFORMANCE CHARACTERISTICS

Output Load and Line Regulation

5.20

5.15

OUTPUT VOLTAGE (V)

5.10

5.05

5.00

4.95

4.90

4.85

4.80

0

0.6

V

IN

= 24V

V

IN

= 48V

V

IN

= 72V

1.2 1.8 2.4

3.0

LOAD CURRENT (A)

3.6

4.2

FRONT PAGE APPLICATION

5.3

5.2

5.1

5.0

4.9

4.8

4.7

–50 –25

R

TC

= OPEN

T

A

= 25°C, unless otherwise noted.

Switching Frequency

vs Load Current

500

FRONT PAGE APPLICATION

Output Temperature Variation

FRONT PAGE APPLICATION

V

IN

= 48V

I

OUT

= 1A

R

TC

= 100k

FREQUENCY (kHz)

400

300

200

100

0

25 50 75 100 125 150

TEMPERATURE (°)

8304 G02

0

V

IN

= 24V

V

IN

= 48V

V

IN

= 72V

0

0.6

1.2 1.8 2.4

3

LOAD CURRENT (A)

3.6

4.2

8304 G01

8304 G03

Boundary Mode Waveforms

Discontinuous Mode Waveforms

Burst Mode Operation Waveforms

V

SW

50V/DIV

V

SW

50V/DIV

V

OUT

50mV/DIV

2µs/DIV

FRONT PAGE APPLICATION

V

IN

= 48V

I

OUT

= 3A

8304 G04

V

SW

50V/DIV

V

OUT

50mV/DIV

2µs/DIV

FRONT PAGE APPLICATION

V

IN

= 48V

I

OUT

= 0.5A

8304 G05

V

OUT

50mV/DIV

20µs/DIV

FRONT PAGE APPLICATION

V

IN

= 48V

I

OUT

= 20mA

8304 G06

10

V

IN

Shutdown Current

T

J

= 150°C

T

J

= 25°C

T

J

= –50°C

V

IN

Quiescent Current,

Sleep Mode

150

140

130

I

Q

(µA)

120

110

T

J

= 25°C

T

J

= –50°C

370

I

Q

(µA)

410

T

J

= 150°C

430

450

V

IN

Quiescent Current,

Active Mode

T

J

= 150°C

8

I

Q

(µA)

6

T

J

= 25°C

T

J

= –50°C

4

390

2

100

90

0

20

40

60

V

IN

(V)

80

100

8304 G07

0

20

40

60

V

IN

(V)

80

100

8304 G08

350

0

20

40

60

V

IN

(V)

80

100

8304 G09

4

8304fa

For more information

www.linear.com/LT8304

LT8304/LT8304-1

TYPICAL PERFORMANCE CHARACTERISTICS

EN/UVLO Enable Threshold

1.240

1.235

1.230

V

EN/UVLO

(V)

1.225

1.220

1.215

1.210

1.205

1.200

–50 –25

0

25 50 75 100 125 150

TEMPERATURE (°C)

8304 G10

T

A

= 25°C, unless otherwise noted.

INTV

CC

Voltage vs Temperature

EN/UVLO Hysteresis Current

5

3.10

3.05

3.00

V

INTVCC

(V)

I

HYST

(µA)

3

2.95

2.90

2.85

RISING

4

I

INTVCC

= 0mA

FALLING

2

I

INTVCC

= 10mA

1

0

–50 –25

0

25 50 75 100 125 150

TEMPERATURE (°C)

8304 G11

2.80

–50 –25

0

25 50 75 100 125 150

TEMPERATURE (°C)

8304 G12

3.10

3.05

3.00

V

INTVCC

(V)

2.95

2.90

2.85

2.80

INTV

CC

Voltage vs V

IN

2.8

2.7

I

INTVCC

= 0mA

V

INTVCC

(V)

2.6

2.5

2.4

2.3

INTV

CC

UVLO Threshold

INTV

CC

UVLO Threshold

40

30

20

VOLTAGE (mV)

(R

FB

–

V

IN

)

Voltage

-

V

IN

Voltage

I

RFB

= 125µA

RISING

FALLING

10

0

–10

–20

–30

I

RFB

= 75µA

I

RFB

= 100µA

I

INTVCC

= 10mA

0

20

40

60

V

IN

(V)

80

100

8304 G13

2.2

–50 –25

0

25 50 75 100 125 150

TEMPERATURE (°C)

8304 G14

–40

–50 –25

0

25 50 75 100 125 150

TEMPERATURE (°C)

8304 G15

1.010

1.008

1.006

1.004

V

RREF

(V)

R

REF

Regulation Voltage

R

REF

Regulation Voltage

1.010

1.008

1.006

1.004

V

RREF

(V)

R

REF

Line Regulation

REF

TC Pin Voltage

1.5

1.4

1.3

1.2

V

TC

(V)

1.1

1.0

0.9

0.8

1.002

1.000

0.998

0.996

0.994

0.992

0.990

–50 –25

0

25 50 75 100 125 150

TEMPERATURE (°C)

8304 G16

1.002

1.000

0.998

0.996

0.994

0.992

0.990

0

20

40

60

V

IN

(V)

80

100

8304 G17

0.7

–50 –25

0

25 50 75 100 125 150

TEMPERATURE (°C)

8304 G18

8304fa

For more information

www.linear.com/LT8304

5

Parameter Name	Attribute value
EU restricts the use of certain hazardous substances	Compliant
ECCN (US)	EAR99
Part Status	Active
HTS	8542.90.00.00
Number of Outputs	1
Topology	Flyback
Maximum Switching Frequency (kHz)	385
Minimum Input Voltage (V)	3
Maximum Input Voltage (V)	100
Operating Supply Voltage (V)	3 to 100
Typical Quiescent Current (mA)	0.39
Minimum Switching Frequency (kHz)	315
Typical Switching Frequency (kHz)	350
Synchronous Rectifier	No
Synchronous Clock	No
Programmability	Yes
Minimum Operating Temperature (°C)	-40
Maximum Operating Temperature (°C)	125
Supplier Temperature Grade	Extended
Packaging	Tape and Reel
Pin Count	8
Standard Package Name	SOP
Supplier Package	SOIC N EP
Mounting	Surface Mount
Package Height	1.5(Max)
Package Length	5(Max)
Package Width	3.99(Max)
PCB changed	8
Lead Shape	Gull-wing

	LT8304ES8E#TRPBF	LT8304ES8E#PBF	LT8304ES8E-1#PBF	LT8304ES8E-1#TRPBF	LT8304HS8E-1#PBF	LT8304IS8E#PBF	LT8304IS8E#TRPBF	LT8304IS8E-1#PBF	LT8304IS8E-1#TRPBF
Description	DC/DC Cntrlr Single-OUT Flyback 385kHz Automotive 8-Pin SOIC N EP T/R	100VIN Micropower No-Opto Isolated Flyback Converter with 150V/2A Switch	DC/DC Cntrlr Single-OUT Flyback 385kHz Automotive 8-Pin SOIC N EP Tube	DC/DC Cntrlr Single-OUT Flyback 385kHz Automotive 8-Pin SOIC N EP T/R	DC/DC Cntrlr Single-OUT Flyback 385kHz Automotive 8-Pin SOIC N EP Tube	DC/DC Cntrlr Single-OUT Flyback 385kHz Automotive 8-Pin SOIC N EP Tube	DC/DC Cntrlr Single-OUT Flyback 385kHz Automotive 8-Pin SOIC N EP T/R	DC/DC Cntrlr Single-OUT Flyback 385kHz Automotive 8-Pin SOIC N EP Tube	DC/DC Cntrlr Single-OUT Flyback 385kHz Automotive 8-Pin SOIC N EP T/R
EU restricts the use of certain hazardous substances	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant
ECCN (US)	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Part Status	Active	Active	Active	Active	Active	Active	Active	Active	Active
HTS	8542.90.00.00	8542.39.00.01	8542.39.00.01	8542.39.00.01	8542.39.00.01	8542.39.00.01	8542.39.00.01	8542.39.00.01	8542.39.00.01
Number of Outputs	1	1	1	1	1	1	1	1	1
Topology	Flyback	Flyback	Flyback	Flyback	Flyback	Flyback	Flyback	Flyback	Flyback
Maximum Switching Frequency (kHz)	385	385	385	385	385	385	385	385	385
Minimum Input Voltage (V)	3	3	3	3	3	3	3	3	3
Maximum Input Voltage (V)	100	100	100	100	100	100	100	100	100
Operating Supply Voltage (V)	3 to 100	3 to 100	3 to 100	3 to 100	3 to 100	3 to 100	3 to 100	3 to 100	3 to 100
Typical Quiescent Current (mA)	0.39	0.39	0.39	0.39	0.39	0.39	0.39	0.39	0.39
Minimum Switching Frequency (kHz)	315	315	315	315	315	315	315	315	315
Typical Switching Frequency (kHz)	350	350	350	350	350	350	350	350	350
Synchronous Rectifier	No	No	No	No	No	No	No	No	No
Synchronous Clock	No	No	No	No	No	No	No	No	No
Programmability	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Minimum Operating Temperature (°C)	-40	-40	-40	-40	-40	-40	-40	-40	-40
Maximum Operating Temperature (°C)	125	125	125	125	150	125	125	125	125
Supplier Temperature Grade	Extended	Extended	Extended	Extended	Automotive	Industrial	Industrial	Industrial	Industrial
Packaging	Tape and Reel	Tube	Tube	Tape and Reel	Tube	Tube	Tape and Reel	Tube	Tape and Reel
Pin Count	8	8	8	8	8	8	8	8	8
Standard Package Name	SOP	SOP	SOP	SOP	SOP	SOP	SOP	SOP	SOP
Supplier Package	SOIC N EP	SOIC N EP	SOIC N EP	SOIC N EP	SOIC N EP	SOIC N EP	SOIC N EP	SOIC N EP	SOIC N EP
Mounting	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package Height	1.5(Max)	1.5(Max)	1.5(Max)	1.5(Max)	1.5(Max)	1.5(Max)	1.5(Max)	1.5(Max)	1.5(Max)
Package Length	5(Max)	5(Max)	5(Max)	5(Max)	5(Max)	5(Max)	5(Max)	5(Max)	5(Max)
Package Width	3.99(Max)	3.99(Max)	3.99(Max)	3.99(Max)	3.99(Max)	3.99(Max)	3.99(Max)	3.99(Max)	3.99(Max)
PCB changed	8	8	8	8	8	8	8	8	8
Lead Shape	Gull-wing	Gull-wing	Gull-wing	Gull-wing	Gull-wing	Gull-wing	Gull-wing	Gull-wing	Gull-wing

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