FeaTures

n

LT3782A

2-Phase Step-Up

DC/DC Controller

DescripTion

The

LT

®

3782A

is a current mode 2-phase step-up DC/DC

converter controller. Its high switching frequency (up to

500kHz) and 2-phase operation reduce system filtering

capacitance and inductance requirements.

With 10V gate drive (V

CC

≥13V) and 4A peak drive current,

the LT3782A can drive most industrial grade high power

MOSFETs with high efficiency. For synchronous applica-

tions, the LT3782A provides synchronous gate signals

with programmable falling edge delay to avoid cross

conduction when using external MOSFET drivers. Other

features include programmable undervoltage lockout,

soft-start, current limit, duty cycle clamp (50% or higher)

and slope compensation. The LT3782A is identical to the

LT3782 except that the LT3782A has a tighter current

sense mismatch tolerance.

The LT3782A is available in thermally enhanced 28-lead

TSSOP and 4mm

×

5mm QFN packages.

L,

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

and No R

SENSE

are trademarks of Linear Technology Corporation. All other trademarks are the

property of their respective owners. Protected by U.S. Patents including 6144194.

n

2-Phase Operation Reduces Required Input and

Output Capacitance

Programmable Switching Frequency:

150kHz to 500kHz

6V to 40V Input Range

10V Gate Drive with V

CC

≥13V

High Current Gate Drive (4A)

Programmable Soft-Start and Current Limit

Programmable Slope Compensation for

High Noise Immunity

MOSFET Gate Signals with Programmable

Falling Edge Delay for External Synchronous Drivers

Programmable Undervoltage Lockout

Programmable Duty Cycle Clamp (50% or Higher)

Thermally Enhanced 28-Lead TSSOP and 4mm

×

5mm QFN Packages

applicaTions

n

Industrial Equipment

Telecom Infrastructure

Interleaved Isolated Power Supply

Typical applicaTion

50V 4A Boost Converter

V

IN

10V TO 36V

10µF

×2

1µF

825k

RUN

274k

V

CC

GBIAS1

GBIAS2

GBIAS

BGATE1

LT3782A

V

EE1

SLOPE

80k

DELAY

DCL

R

SET

0.1µF

SS

V

EE2

10

SENSE1

+

SENSE1

–

SENSE2

+

SENSE2

–

FB

GND

10nF

10

24.9k

0.004

475k

85

0

1

2

3

I

OUT

(A)

4

5

3782A TA01b

20µH

2µF

Q1

0.004

D1

D2

10µF

×2

Efficiency and Power Loss

vs Load Current

V

OUT

50V, 4A

97

EFFICIENCY

220µF

EFFICIENCY (%)

95

93

91

89

87

V

IN

= 12V

V

IN

= 24V

POWER LOSS

V

IN

= 12V

V

IN

= 24V

15

12

9

6

3

0

POWER LOSS (W)

18

+

59k

BGATE2

Q2

V

C

13k

100pF

6.8nF

D1, D2: 30BQ060PbF

Q1, Q2: Si7852DP-T1-E3

3782A TA01

3782afc

For more information

www.linear.com/LT3782A

1

LT3782A

absoluTe MaxiMuM raTings

(Note 1)

V

CC

Supply Voltage ...................................................40V

GBIAS, GBIAS1, GBIAS2 Pin

(Externally Forced)....................................................14V

SYNC, RUN Pin .........................................................30V

Operating Junction Temperature

Range (Notes 2, 3) ................................. –40°C to 125°C

SS ........................................................... 300µA Max I

SS

SENSE1

+

, SENSE2

+

,

SENSE1

–

, SENSE2

–

..................................... –0.3V to 2V

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

Lead Temperature (Soldering, 10 sec)

For FE Package ..................................................... 300°C

pin conFiguraTion

TOP VIEW

SGATE1

SGATE2

GBIAS

SGATE2

SGATE1

NC

GND

SYNC

DELAY

DCL

SENSE1

+

SENSE1

–

1

2

3

4

5

6

7

8

9

29

GND

28 GBIAS

27 V

CC

26 NC

25 NC

24 V

EE1

23 BGATE1

22 GBIAS1

21 GBIAS2

20 BGATE2

19 V

EE2

18 NC

17 RUN

16 FB

15 V

C

TOP VIEW

28 27 26 25 24 23

SYNC 1

DELAY 2

DCL 3

SENSE1

+

4

SENSE1

–

5

29

GND

SLOPE 6

R

SET

7

SENSE2

–

8

9 10 11 12 13 14

SLOPE 10

R

SET

11

SENSE2

–

12

SENSE2

+

13

SS 14

FB

FE PACKAGE

28-LEAD PLASTIC TSSOP

T

JMAX

= 125°C,

θ

JA

= 30°C/ W

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

UFD PACKAGE

28-LEAD (4mm

×

5mm) PLASTIC QFN

T

JMAX

= 125°C,

θ

JA

= 37°C/ W

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

orDer inForMaTion

LEAD FREE FINISH

LT3782AEFE#PBF

LT3782AIFE#PBF

LT3782AEUFD#PBF

LT3782AIUFD#PBF

LEAD BASED FINISH

LT3782AEFE

LT3782AIFE

LT3782AEUFD

LT3782AIUFD

TAPE AND REEL

LT3782AEFE#TRPBF

LT3782AIFE#TRPBF

LT3782AEUFD#TRPBF

LT3782AIUFD#TRPBF

TAPE AND REEL

LT3782AEFE#TR

LT3782AIFE#TR

LT3782AEUFD#TR

LT3782AIUFD#TR

PART MARKING*

LT3782AFE

3782A

PART MARKING*

LT3782AFE

3782A

PACKAGE DESCRIPTION

28-Lead Plastic TSSOP

28-Lead (4mm

×

5mm) Plastic QFN

28-Lead (4mm

×

5mm) Plastic QFN

PACKAGE DESCRIPTION

28-Lead Plastic TSSOP

28-Lead (4mm

×

5mm) Plastic QFN

28-Lead (4mm

×

5mm) Plastic QFN

TEMPERATURE RANGE

–40°C to 125°C

TEMPERATURE RANGE

–40°C to 125°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/

SENSE2

RUN

NC

SS

+

V

C

V

EE1

22 BGATE1

21 GBIAS1

20 NC

19 NC

18 GBIAS2

17 BGATE2

16 V

EE2

15 NC

GND

V

CC

2

3782afc

For more information

www.linear.com/LT3782A

LT3782A

The

l

denotes the specifications which apply over the full operating junction

temperature range, otherwise specifications are at T

J

= 25°C. V

CC

= 13V, R

SET

= 80k, no load on any outputs, unless otherwise noted.

PARAMETER

Overall

Supply Voltage (V

CC

)

Supply Current (I

VCC

)

Shutdown

RUN Threshold

RUN Threshold Hysteresis

Supply Current in Shutdown

RUN Pin Input Current

Voltage Amplifier g

m

Reference Voltage (V

REF

)

l

elecTrical characTerisTics

CONDITIONS

MIN

6

TYP

MAX

40

UNITS

V

mA

V

mV

mA

µA

V

µmho

µA

V

µA

V

µA

V

C

≤ 0.5V (Switching Off), V

CC

≤ 40V

2.3

11

2.44

80

0.4

40

l

16

2.6

0.65

90

–2

2.464

2.488

370

0.6

0.4

14

28

15

1V ≤ RUN ≤ V

REF

RUN ≤ 0.3V, V

CC

≤ 30V

V

RUN

= 2.3V

–0.5

2.42

2.4

200

2.44

260

0.2

1.5

0.35

8

13

11

20

10

4

Transconductance

Input Current I

FB

V

C

High

V

C

Low

Source Current I

VC

Sink Current I

VC

V

C

Threshold for Switching Off (BGATE1, BGATE2 Low)

Soft-Start Current I

SS

Current Amplifier CA1, CA2

Voltage Gain ∆V

C

/∆V

SENSE

Current Limit (V

SENSE1+

– V

SENSE1–

) (V

SENSE2+

– V

SENSE2–

)

Current Limit Mismatch

Input Current (I

SENSE1+

, I

SENSE1–

, I

SENSE2+

, I

SENSE2–

)

Oscillator

Switching Frequency

V

VC

= 1V, ∆I

VC

= ±2µA

V

FB

= V

REF

I

VC

= 0

I

VC

= 0

V

VC

= 0.7V – 1V, V

FB

= V

REF

– 100mV

V

VC

= 0.7V – 1V, V

FB

= V

REF

+ 100mV

l

0.3

6

V

SS

= 0.1V – 2.8V

V

FB

= 2.3V

(∆V

SENSE1

– ∆V

SENSE2

), V

FB

= 2.3V

∆V

SENSE

= 0V

R

SET

= 130k

R

SET

= 80k

R

SET

= 40k

Rising Edge V

SYNC

R

SET

= 130k

R

SET

= 80k

R

SET

= 40k

R

SET

= 80k

V

FB

= V

REF

– 25mV, R

SET

> 80k

R

SET

= 40k

R

SET

= 80k, V

DCL

≤ 0.3V

V

DCL

= 1.2V

V

DCL

= V

RSET

V

DCL

≤ 0.3V

l

55

–10

63

60

70

10

mV

µA

130

212

386

0.8

180

290

550

154

250

465

1.2

177

288

533

2

240

392

715

kHz

V

kHz

V

%

Synchronization Pulse Threshold on SYNC Pin

Synchronization Frequency Range

(Note: Operation Switching Frequency Equals

Half of the Synchronization Frequency)

V

RSET

Maximum Duty Cycle

Duty Cycle Limit

2.3

90

83

94

90

50

75

Max Duty Cycle

–0.1

–0.3

DCL Pin Input Current

µA

3782afc

For more information

www.linear.com/LT3782A

3

LT3782A

The

l

denotes the specifications which apply over the full operating junction

temperature range, otherwise specifications are at T

J

= 25°C. V

CC

= 13V, R

SET

= 80k, no load on any outputs, unless otherwise noted.

PARAMETER

Gate Driver

V

GBIAS

BGATE1, BGATE2 High Voltage

BGATE1, BGATE2 Source Current (Peak)

BGATE1, BGATE2 Low Voltage

BGATE1, BGATE2 Sink Current (Peak)

SGATE1, SGATE2 High Voltage

SGATE1, SGATE2 Low Voltage

SGATE1, SGATE2 Peak Current

Delay of BGATE High

I

GBIAS

< 70mA

13V ≤ V

CC

≤ 24V, I

BGATE

= –100mA

V

CC

= 8V, I

BGATE

= –100mA

Capacitive Load >22µF

Capacitive Load >50µF

8V ≤ V

CC

≤ 24V, I

BGATE

= 100mA

Capacitive Load >22µF

Capacitive Load >50µF

8V ≤ V

CC

≤ 24V, I

SGATE

= –20mA

8V ≤ V

CC

≤ 24V, I

SGATE

= 20mA

500pF Load

DELAY Pin and R

SET

Pin Shorted

V

DELAY

= 1V

V

DELAY

= 0.5V

V

DELAY

= 0.25V

V

DELAY

= 0.25V

l

elecTrical characTerisTics

CONDITIONS

MIN

10.2

7.8

3.8

TYP

11

9.2

5

3

4

0.5

3

4

MAX

11.7

10.5

UNITS

V

A

0.7

V

A

4.5

5.5

0.5

100

150

250

500

–0.1

6.7

0.7

V

mA

ns

Delay Pin Input Current

–0.3

µA

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 LT3782AE is guaranteed to meet performance specifications

from 0°C to 85°C operating 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 LT3782AI is guaranteed to meet performance specifications over the

full –40°C to 125°C operating junction temperature range. The maximum

ambient temperature is determined by specific operating conditions in

conjunction with board layout, the rated package thermal resistance and

other environmental factors.

Note 3:

This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed 125°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

Typical perForMance characTerisTics

11.0

10.9

10.8

10.7

V

GBIAS

(V)

T

J

= 25°C unless otherwise noted.

∆V

REF

vs V

CC

, ∆Frequency vs V

CC

(R

SET

= 80k)

3

2

1

∆V

REF

(mV)

V

GBIAS

vs I

GBIAS

20

18

16

14

I

CC

vs V

CC

12

10

8

∆V

REF

6

4

∆FREQUENCY

2

0

–2

6

9

12

15

18

V

CC

(V)

3782A G03

∆FREQUENCY (kHz)

10.5

10.4

10.3

10.2

10.1

10.0

0

50

I

GBIAS

(mA)

3782A G01

I

CC

(mA)

10.6

12

10

8

6

4

2

0

–1

–2

–3

–4

100

0

6

8 10 12 14 16 18 20 22 24 26 28 30

V

CC

(V)

3782A G02

–5

21

24

27

30

–4

4

3782afc

For more information

www.linear.com/LT3782A

LT3782A

Typical perForMance characTerisTics

Switching Frequency vs R

FREQ

600

T

J

= 25°C, unless otherwise noted.

Current Limit Threshold

vs Temperature

70

CURRENT LIMIT THRESHOLD (mV)

67

Reference Voltage

vs Temperature

2.446

2.444

REFERENCE VOLTAGE (V)

500

FREQUENCY (kHz)

400

2.442

2.440

2.438

2.436

2.434

64

61

300

200

58

55

–45

100

0

20 40 60 80 100 120 140 160 180 200

R

FREQ

(k )

3782A G04

0

25

75

100

125

50

JUNCTION TEMPERATURE (°C)

150

–20

30

55

5

80

TEMPERATURE (°C)

105

130

3782A G05

3782A G10

V

GBIAS

vs I

GBIAS

at Start-Up

(Charging 2µF)

14

12

10

V

GBIAS

(V)

SGATE (Low) to BGATE (High)

Delay vs V

DELAY

(R

SET

= 80k)

800

1000

900

800

700

600

V

GBIAS

DELAY (ns)

8

6

4

2

0

–2

0

250µ

500µ

TIME (s)

750µ

I

GBIAS

500

400

300

200

100

0

1m

3782A G06

600

500

400

300

200

100

0

0.5

1.5

1.0

V

DELAY

(V)

2.0

2.5

3782A G07

I

GBIAS

(mA)

Switching Frequency

vs Duty Cycle

105

120

110

MAXIMUM DUTY CYCLE (%)

Maximum Duty Cycle Limit

vs V

DCL

(R

SET

= 80k)

100

90

80

70

60

50

DUTY CYCLE (%)

95

90

85

80

100

200

400

500

300

SWITCHING FREQUENCY (kHz)

600

3782A G08

40

0

0.3

0.6

0.9

1.5

V

DCL

(V)

1.2

1.8

2.1

2.4

3782A G09

3782afc

For more information

www.linear.com/LT3782A

5

参数名称	属性值
Brand Name	Analog Devices Inc
是否无铅	含铅
是否Rohs认证	符合
包装说明	HVQCCN,
针数	28
制造商包装代码	05-08-1712
Reach Compliance Code	compliant
模拟集成电路 - 其他类型	SWITCHING CONTROLLER
控制模式	CURRENT-MODE
控制技术	PULSE WIDTH MODULATION
最大输入电压	40 V
最小输入电压	6 V
标称输入电压	13 V
JESD-30 代码	R-PQCC-N28
JESD-609代码	e3
长度	5 mm
湿度敏感等级	1
功能数量	1
端子数量	28
最高工作温度	125 °C
最低工作温度	-40 °C
最大输出电流	0.07 A
封装主体材料	PLASTIC/EPOXY
封装代码	HVQCCN
封装形状	RECTANGULAR
封装形式	CHIP CARRIER
峰值回流温度（摄氏度）	260
认证状态	Not Qualified
座面最大高度	0.8 mm
表面贴装	YES
切换器配置	PHASE-SHIFT
最大切换频率	533 kHz
温度等级	AUTOMOTIVE
端子面层	Matte Tin (Sn)
端子形式	NO LEAD
端子节距	0.5 mm
端子位置	QUAD
处于峰值回流温度下的最长时间	NOT SPECIFIED
宽度	4 mm
Base Number Matches	1

	LT3782AIUFD#TRPBF	LT3782AIUFD#PBF
描述	Switching Voltage Regulators 2-Phase Step-Up DC/DC Controller	开关稳压器 2-Phase Step-Up DC/DC Controller
Brand Name	Analog Devices Inc	Analog Devices Inc
是否无铅	含铅	含铅
是否Rohs认证	符合	符合
包装说明	HVQCCN,	HVQCCN,
针数	28	28
制造商包装代码	05-08-1712	05-08-1712
Reach Compliance Code	compliant	compliant
模拟集成电路 - 其他类型	SWITCHING CONTROLLER	SWITCHING CONTROLLER
控制模式	CURRENT-MODE	CURRENT-MODE
控制技术	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION
最大输入电压	40 V	40 V
最小输入电压	6 V	6 V
标称输入电压	13 V	13 V
JESD-30 代码	R-PQCC-N28	R-PQCC-N28
JESD-609代码	e3	e3
长度	5 mm	5 mm
湿度敏感等级	1	1
功能数量	1	1
端子数量	28	28
最高工作温度	125 °C	125 °C
最低工作温度	-40 °C	-40 °C
最大输出电流	0.07 A	0.07 A
封装主体材料	PLASTIC/EPOXY	PLASTIC/EPOXY
封装代码	HVQCCN	HVQCCN
封装形状	RECTANGULAR	RECTANGULAR
封装形式	CHIP CARRIER	CHIP CARRIER
峰值回流温度（摄氏度）	260	260
认证状态	Not Qualified	Not Qualified
座面最大高度	0.8 mm	0.8 mm
表面贴装	YES	YES
切换器配置	PHASE-SHIFT	PHASE-SHIFT
最大切换频率	533 kHz	533 kHz
温度等级	AUTOMOTIVE	AUTOMOTIVE
端子面层	Matte Tin (Sn)	MATTE TIN
端子形式	NO LEAD	NO LEAD
端子节距	0.5 mm	0.5 mm
端子位置	QUAD	QUAD
处于峰值回流温度下的最长时间	NOT SPECIFIED	NOT SPECIFIED
宽度	4 mm	4 mm
Base Number Matches	1	1

LT3782AIUFD#TRPBF

LT3782AIUFD#TRPBF概述

LT3782AIUFD#TRPBF规格参数

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