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FEATURES

n

LT8364

Low I

Q

Boost/SEPIC/

Inverting Converter

with 4A, 60V Switch

DESCRIPTION

The

LT

®

8364

is a current mode DC/DC converter with a

60V, 4A switch operating from a 2.8V to 60V input. With

a unique single feedback pin architecture it is capable

of boost, SEPIC or inverting configurations. Burst Mode

operation consumes as low as 9µA quiescent current to

maintain high efficiency at very low output currents, while

keeping typical output ripple below 15mV.

An external compensation pin allows optimization of loop

bandwidth over a wide range of input and output volt-

ages and programmable switching frequencies between

300kHz and 2MHz. A SYNC/MODE pin allows synchroni-

zation to an external clock. It can also be used to select

between burst or pulse-skip modes of operation with or

without Spread Spectrum Frequency Modulation for low

EMI. For increased efficiency, a BIAS pin can accept a

second input to supply the INTV

CC

regulator. Additional

features include frequency foldback and programmable

soft-start to control inductor current during startup.

The LT8364 is available in a thermally enhanced 12-lead

4mm

×

3mm DFN package or a thermally enhanced

16-lead MSOP package with four pins removed.

n

Wide Input Voltage Range: 2.8V to 60V

Ultralow Quiescent Current and Low Ripple

Burst Mode

®

Operation: I

Q

= 9µA

4A, 60V Power Switch

Positive or Negative Output Voltage Programming

with a Single Feedback Pin

Programmable Frequency (300kHz to 2MHz)

Synchronizable to an External Clock

Spread Spectrum Frequency Modulation for Low EMI

BIAS Pin for Higher Efficiency

Programmable Undervoltage Lockout (UVLO)

Thermally Enhanced 12-lead 4mm

×

3mm DFN and

16-lead MSOP packages

APPLICATIONS

n

Industrial and Automotive

Telecom

Medical Diagnostic Equipment

Portable Electronics

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

TYPICAL APPLICATION

2MHz, 48V Output Boost Converter

V

IN

8V TO 38V

3.3 H

4.7µF

V

IN

EN/UVLO

LT8364

SW

FBX

BIAS

INTV

CC

GND V

C

36.5k

10nF

2.2nF

8364 TA01a

Efficiency and Power Loss

V

OUT

48V

300mA AT V

IN

= 8V

640mA AT V

IN

= 12V

1A AT V

IN

= 24V

4.7µF

x2

EFFICIENCY (%)

100

90

80

70

60

50

40

30

20

10

0

V

IN

= 12V

V

IN

= 24V

POWER LOSS

EFFICIENCY

3.0

2.7

2.4

2.1

1.8

1.5

1.2

0.9

0.6

0.3

POWER LOSS (W)

1M

SYNC/MODE

RT

20k

SS

1µF

34.8k

0

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1

LOAD CURRENT (A)

8364 TA01b

8364f

For more information

www.linear.com/LT8364

1

LT8364

ABSOLUTE MAXIMUM RATINGS

(Note 1)

SW ............................................................................ 60V FBX ........................................................................... ±4V

V

IN

, EN/UVLO............................................................ 60V Operating Junction Temperature (Note 3)

BIAS .......................................................................... 40V

LT8364E, LT8364I ..............................–40°C to 125°C

EN/UVLO Pin Above V

IN

Pin, SYNC............................. 6V

LT8364H .............................................–40°C to 150°C

INTV

CC

...............................................................(Note 2) Storage Temperature Range ...................–65°C to 150°C

V

C

............................................................................... 4V

PIN CONFIGURATION

TOP VIEW

EN/UVLO 1

V

IN

3

INTV

CC

NC

BIAS

V

C

5

6

7

8

17

PGND,

GND

16 SW1

14 SW2

12

11

10

9

SYNC/MODE

SS

RT

FBX

NC

EN/UVLO

V

IN

INTV

CC

BIAS

V

C

1

2

3

4

5

6

13

GND

12 SW1

11 SW2

10 SYNC/MODE

9

8

7

SS

RT

FBX

MSE PACKAGE

VARIATION: MSE16 (12)

16-LEAD PLASTIC MSOP

θ

JA

= 45°C/W,

θ

JC

= 10°C/W

EXPOSED PAD (PIN 17) IS PGND AND GND, MUST BE SOLDERED TO PCB

DE PACKAGE

12-LEAD (4mm

×

3mm) PLASTIC DFN

θ

JA

= 43°C/W,

θ

JC

= 5.5°C/W

EXPOSED PAD (PIN 13) IS PGND AND GND, MUST BE SOLDERED TO PCB

ORDER INFORMATION

LEAD FREE FINISH

LT8364EMSE#PBF

LT8364IMSE#PBF

LT8364HMSE#PBF

LT8364EDE#PBF

LT8364IDE#PBF

LT8364HDE#PBF

TAPE AND REEL

LT8364EMSE#TRPBF

LT8364IMSE#TRPBF

LT8364HMSE#TRPBF

LT8364EDE#TRPBF

LT8364IDE#TRPBF

LT8364HDE#TRPBF

http://www.linear.com/product/LT8364#orderinfo

PART MARKING*

8364

PACKAGE DESCRIPTION

16-Lead Plastic MSOP with 4 Pins Removed

12-Lead (4mm

×

3mm) Plastic DFN

12-Lead (4mm

×

3mm) Plastic DFN

12-Lead (4mm

×

3mm) Plastic DFN

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.

8364f

2

For more information

www.linear.com/LT8364

LT8364

The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. V

IN

= 12V, EN/UVLO = 12V unless otherwise noted.

PARAMETER

V

IN

Operating Voltage Range

V

IN

Quiescent Current at Shutdown

V

EN/UVLO

= 0.2V

l

ELECTRICAL CHARACTERISTICS

CONDITIONS

MIN

l

TYP

1

2

9

1200

22

4.4

4

BIAS – 2V

V

IN

MAX

60

2

15

5

25

15

30

1600

1850

40

65

4.65

4.25

UNITS

V

μA

µA

V

2.8

V

EN/UVLO

= 1.5V

l

V

IN

Quiescent Current

Sleep Mode (Not Switching)

Active Mode (Not Switching)

SYNC = 0V

l

SYNC = 0V or INTV

CC

, BIAS = 0V

l

SYNC = 0V or INTV

CC

, BIAS = 5V

l

BIAS Threshold

V

IN

Falling Threshold to Supply INTV

CC

BIAS Falling Threshold to Supply INTV

CC

FBX Regulation

FBX Regulation Voltage

FBX Line Regulation

FBX Pin Current

Oscillator

Switching Frequency (f

OSC

)

SSFM Maximum Frequency Deviation

Minimum On-Time

Minimum Off-Time

SYNC/Mode, Mode Thresholds (Note 5)

SYNC/Mode, Clock Thresholds (Note 5)

f

SYNC

/f

OSC

Allowed Ratio

SYNC Pin Current

Switch

Maximum Switch Current Limit Threshold

Switch Overcurrent Threshold

Switch R

DS(ON)

Switch Leakage Current

Rising, BIAS Can Supply INTV

CC

Falling, BIAS Cannot Supply INTV

CC

BIAS = 12V

V

IN

= 12V

FBX > 0V

FBX < 0V

FBX > 0V, 2.8V < V

IN

< 60V

FBX < 0V, 2.8V < V

IN

< 60V

FBX = 1.6V, –0.8V

R

T

= 165k

R

T

= 45.3k

R

T

= 20k

∆f/f

OSC

• 100, R

T

= 20k

Burst Mode, V

IN

= 24V (Note 6)

Pulse-Skip Mode, V

IN

= 24V (Note 6)

l

1.568

–0.820

1.6

–0.80

0.005

1.632

–0.780

0.015

10

V

%/V

nA

kHz

MHz

%

ns

V

kHz/kHz

µA

A

mΩ

–10

273

0.92

1.85

14

300

1

2

20

85

60

50

0.14

0.4

0.95

1.3

0.2

1.3

0.8

1

10

l

327

1.08

2.15

25

110

85

75

1.7

1.25

25

6.4

High (Rising)

Low (Falling)

Rising

Falling

R

T

= 20k

SYNC = 2V

SYNC = 0V, Current Out of Pin

l

4

5

7.5

100

0.1

Discharges SS Pin

I

SW

= 0.5A

V

SW

= 60V

1

µA

8364f

For more information

www.linear.com/LT8364

3

LT8364

The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. V

IN

= 12V, EN/UVLO = 12V unless otherwise noted.

PARAMETER

EN/UVLO Logic

EN/UVLO Pin Threshold (Rising)

EN/UVLO Pin Threshold (Falling)

EN/UVLO Pin Current

Soft-Start

Soft-Start Charge Current

Soft-Start Pull-Down Resistance

Error Amplifier

Error Amplifier Transconductance

Error Amplifier Voltage Gain

Error Amplifier Max Source Current

Error Amplifier Max Sink Current

FBX = 1.6V

FBX = –0.8V

FBX = 1.6V

FBX = –0.8V

V

C

= 1.1V, Current Out of Pin

V

C

= 1.1V

75

60

185

145

7

µA/V

V/V

µA

SS = 0.5V

Fault Condition, SS = 0.1V

2

220

µA

Ω

Start Switching

Stop Switching

V

EN/UVLO

= 1.6V

l

ELECTRICAL CHARACTERISTICS

CONDITIONS

MIN

1.576

1.545

–50

TYP

1.68

1.6

MAX

1.90

1.645

50

UNITS

V

nA

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:

INTV

CC

cannot be externally driven. No additional components or

loading is allowed on this pin.

Note 3:

The LT8364E is 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

LT8364I is guaranteed over the full –40°C to 125°C operating junction

temperature range. The LT8364H is guaranteed over the full –40°C to

150°C operating junction temperature range.

Note 4:

The IC includes overtemperature protection that is intended to

protect the device during overload conditions. Junction temperature will

exceed 150°C when overtemperature protection is active. Continuous

operation above the specified maximum operating junction temperature

will reduce lifetime.

Note 5:

For SYNC/MODE inputs required to select modes of operation see

the Pin Functions and Applications Information sections.

Note 6:

The IC is tested in a Boost converter configuration with the output

voltage programmed for 24V.

8364f

4

For more information

www.linear.com/LT8364

LT8364

TYPICAL PERFORMANCE CHARACTERISTICS

FBX Positive Regulation Voltage

vs Temperature

1.632

1.624

1.616

FBX VOLTAGE (V)

1.608

1.600

1.592

1.584

1.576

1.568

–50 –25

0 25 50 75 100 125 150 175

JUNCTION TEMPERATURE (°C)

8364 G01

FBX Negative Regulation Voltage

vs Temperature

–0.780

–0.785

–0.790

–0.795

–0.800

–0.805

–0.810

–0.815

–0.820

–50 –25

0 25 50 75 100 125 150 175

JUNCTION TEMPERATURE (°C)

8364 G02

EN/UVLO Pin Thresholds

vs Temperature

1.74

1.72

EN/UVLO PIN VOLTAGE (V)

1.70

1.68

1.66

1.64

1.62

1.60

1.58

1.56

1.54

–50 –25

0 25 50 75 100 125 150 175

JUNCTION TEMPERATURE (°C)

8364 G03

V

IN

= 12V

V

IN

= 12V

EN/UVLO RISING (TURN–ON)

EN/UVLO FALLING (TURN–OFF)

Switching Frequency

vs Temperature

2.10

2.08

SWITCHING FREQUENCY (MHz)

2.06

2.04

2.02

2.00

1.98

1.96

1.94

1.92

1.90

–50 –25

0 25 50 75 100 125 150 175

JUNCTION TEMPERATURE (°C)

8364 G04

2.08

SWITCHING FREQUENCY (MHz)

2.06

2.04

2.02

2.00

1.98

1.96

1.94

1.92

1.90

0

5 10 15 20 25 30 35 40 45 50 55 60

V

IN

(V)

8364 G05

NORMALIZED SWITCHING FREQUENCY (%)

V

IN

= 12V

2.10

Switching Frequency vs V

IN

Normalized Switching Frequency

vs FBX Voltage

125

V

IN

= 12V

100

75

50

25

0

–0.8

–0.4

0.0

0.4

0.8

VOLTAGE (V)

1.2

1.6

8364 G06

Switch Current Limit

vs Duty Cycle

6.0

5.8

SWITCH CURRENT LIMIT (A)

5.6

MINIMUM ON TIME (ns)

5.4

5.2

5.0

4.8

4.6

4.4

4.2

4.0

0

10 20 30 40 50 60 70 80 90 100

DUTY CYCLE (%)

8364 G07

Switch Minimum On-Time

vs Temperature

100

90

80

70

60

50

40

30

20

10

0

–50 –25

0 25 50 75 100 125 150 175

JUNCTION TEMPERATURE (°C)

8364 G08

Switch Minimum Off-Time

vs Temperature

100

90

MINIMUM OFF TIME (ns)

80

70

60

50

40

30

20

10

0

–50 –25

0 25 50 75 100 125 150 175

JUNCTION TEMPERATURE (°C)

8364 G09

V

IN

= 12V

V

IN

= 12V

V

IN

= 12V

8364f

For more information

www.linear.com/LT8364

5

参数名称	属性值
功能	升压
输出配置	正
拓扑	升压，SEPIC
输出类型	固定
输出数	1
电压 - 输入（最小值）	2.8V
电压 - 输入（最大值）	60V
电压 - 输出（最大值）	60V（开关）
电流 - 输出	4A（开关）
频率 - 开关	2MHz
工作温度	-40°C ~ 125°C （TJ）
安装类型	表面贴装
封装/外壳	16-TFSOP（0.118"，3.00mm 宽）裸焊盘，12 引线
供应商器件封装	16-MSOP-EP

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