FEATURES

n

LTC3613

24V, 15A Monolithic

Step Down Regulator with

Differential Output Sensing

DESCRIPTION

The LTC

®

3613 is a monolithic synchronous step-down

switching regulator capable of regulating outputs from 0.6V

to 5.5V with up to 15A output current. The controlled on-time

constant frequency valley current mode architecture allows for

both fast transient response and constant frequency switch-

ing in steady-state operation, independent of V

IN

, V

OUT

and

load. This also provides excellent current sharing capability.

Differential output voltage sensing along with a precision

internal reference combine to offer ±0.67% output regula-

tion, even if the output ground reference deviates from

local ground by 500mV. The switching frequency can be

programmed from 200kHz to 1MHz with an external resis-

tor. The switching frequency is also phase synchronizable

to an external clock in applications where switching noise/

EMI reduction is crucial.

Very low t

ON

and t

OFF

times allow for near 0% and near 100%

duty cycles, respectively. Voltage tracking soft start-up is

provided for tracking and sequencing applications. Safety fea-

tures include output overvoltage protection, programmable

current limit with foldback, and power good monitoring.

L,

LT, LTC, LTM, OPTI-LOOP Linear Technology and the Linear logo are registered trademarks

,

and Hot Swap and No R

SENSE

is a trademark of Linear Technology Corporation. All other

trademarks are the property of their respective owners. Protected by U.S. Patents including

5481178, 5487554, 6580258, 6304066, 6476589, 6774611.

Wide V

IN

Range: 4.5V to 24V;

V

OUT

Range: 0.6V to 5.5V at up to 15A

0.67% Output Voltage Accuracy

Controlled On-Time Valley Current Mode Architecture,

Excellent Current Sharing Capability

Frequency Programmable from 200kHz to 1MHz

and Synchronizable to External Clock

R

SENSE

or Inductor DCR Current Sensing With

Accurate Current Limit

Fast Transient Response

Differential Output Voltage Sensing Allowing 500mV

Common Mode Remote Ground

t

ON(MIN)

= 65ns; t

OFF(MIN)

= 105ns

Overvoltage Protection and Current Limit Foldback

Power Good Output Voltage Monitor

Voltage Tracking Start-Up

External V

CC

Input for Bypassing Internal LDO

Micropower Shutdown: I

Q

= 15μA

7mm

×

9mm 56-pin QFN Package

APPLICATIONS

n

Distributed Power System

Point-of-Load Converters

Servers

TYPICAL APPLICATION

High Efficiency High Power Step-Down Converter

INTV

CC

PV

IN

SV

IN

LTC3613

V

OUT

PGOOD

SENSE

RUN

V

RNG

0.1μF

47pF

270pF

MODE/PLLIN

EXTV

CC

TRACK/SS

SENSE

+

–

Efficiency and Power Loss

vs Load Current

100

90

80

EFFICIENCY (%)

70

60

50

40

30

20

V

IN

= 12V

V

OUT

= 1.5V

0.1

10

1

LOAD CURRENT (A)

3613 TA01a

+

0.1μF

10Ω

1000pF

10Ω

0.47μH

82μF

V

IN

4.5V TO 24V

3.5

PULSE-SKIPPING MODE

3.0

2.5

FORCED

CONTINUOUS

MODE

2.0

1.5

1.0

0.5

0

POWER LOSS (W)

100k

1.5mΩ

15k

SW

0.1μF

BOOST

INTV

CC

10k

4.7μF

V

OUT

1.5V

15A

10

330μF

×2

0

0.01

21k

ITH

115k

RT

SGND

+

PGND

V

OSNS+

V

OSNS–

3613 TA01

3613fa

1

LTC3613

ABSOLUTE MAXIMUM RATINGS

(Note 1)

PIN CONFIGURATION

TOP VIEW

56 PV

IN

55 PV

IN

54 PV

IN

53 PV

IN

52 NC

51 SW

50 SW

49 SW

48 SW

47 SW

46 SW

45 SW

PV

IN

1

PV

IN

2

PV

IN

3

PV

IN

4

PV

IN

5

PV

IN

6

PV

IN

7

PV

IN

8

PV

IN

9

SW 10

BOOST 11

SGND 12

PGOOD 13

SNS+ 14

SNS– 15

SGND 16

PV

IN

57

SW

58

SGND

59

44 PGND

43 PGND

42 PGND

41 PGND

40 PGND

39 PGND

38 PGND

37 PGND

36 PGND

35 SW

34 INTV

CC

33 INTV

CC

32 SV

IN

31 MODE/PLLIN

30 EXTV

CC

29 SGND

WKH PACKAGE

56-LEAD (7mm

×

9mm) MULTIPAD QFN

T

JMAX

= 125°C,

θ

JA

= 29°C/W

Supply Voltage (PV

IN

, SV

IN

)....................... –0.3V to 24V

Boost Voltage ............................................ –0.3V to 30V

SW Voltage ................................................ –0.3V to 24V

INTV

CC

, EXTV

CC

, (BOOST-SW), MODE /PLLIN,

V

RNG

, PGOOD, RUN Voltages....................... –0.3V to 6V

V

OSNS+

, V

OSNS –

Voltages ........ –0.6V to (INTV

CC

+ 0.3V)

V

OUT

, SENSE

+,

SENSE

–

Voltages ................. –0.6V to 6V

RT, ITH Voltages ..................... –0.3V to (INTV

CC

+ 0.3V)

TRACK/SS Voltages ..................................... –0.3V to 5V

Operating Junction Temperature Range

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

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

ORDER INFORMATION

LEAD FREE FINISH

LTC3613EWKH#PBF

LTC3613IWKH#PBF

TAPE AND REEL

LTC3613EWKH#TRPBF

LTC3613IWKH#TRPBF

PART MARKING*

LTC3613WKH

PACKAGE DESCRIPTION

56-Lead (7mm

×

9mm) Plastic QFN

56-Lead (7mm

×

9mm) Plastic QFN

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/

SGND 17

V

OUT

18

SGND 19

V

OSNS

– 20

V

OSES

+ 21

TRACK/SS 22

ITH 23

V

RNG

24

RT 25

RUN 26

NC 27

SGND 28

3613fa

2

LTC3613

ELECTRICAL CHARACTERISTICS

SYMBOL

V

IN

V

OUT

I

Q

PARAMETER

Input Voltage Operating Range

Output Voltage Operating Range

Input DC Supply Current

Normal

Shutdown Supply Current

Regulated Differential Feedback Voltage

(V

OSNS+

– V

OSNS–

)

MODE/PLLIN = INTV

CC

RUN = 0V

I

TH

= 1.2V (Note 3)

T

A

= 25°C

T

A

= 0°C to 85°C

T

A

= –40°C to 125°C

V

IN

= 4.5V to 24V, ITH = 0.5V to 1.9V,

V

OSNS–

= ±500mV (Note 3)

T

A

= 0°C to 85°C

T

A

= –40°C to 125°C

0.5985

0.596

0.594

Main Control Loop

l

The

l

denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at T

A

= 25°C. SV

IN

= 15V, V

FB

= V

OSNS+

– V

OSNS–

, unless otherwise noted. (Note 4)

CONDITIONS

MIN

4.5

0.6

2

15

0.6

TYP

MAX

24

5.5

4

25

0.6015

0.604

0.606

UNITS

V

mA

μA

V

REG

l

Regulated Differential Feedback

Voltage Over Line, Load and Common Mode

(V

OSNS+

– V

OSNS–

)

t

ON(MIN)

t

OFF(MIN)

g

m(EA)

V

SENSE(MAX)

Minimum On-Time

Minimum Off-Time

Error Amplifier Transconductance

Valley Current Sense Threshold,

V

SENSE+

– V

SENSE–

,

Peak Current = Valley + Ripple

l

0.594

0.591

0.6

65

105

0.606

0.609

V

ns

I

TH

= 1.2V (Note 3)

V

RNG

= 2V, V

FB

= 0.57V

V

RNG

= 0V, V

FB

= 0.57V

V

RNG

= INTV

CC

, V

FB

= 0.57V

l

1.4

80

22

39

1.7

100

30

50

–50

–15

–25

2

120

38

61

mS

mV

V

SENSE(MIN)

Minimum Current Sense Threshold,V

SENSE+

– V

RNG

= 2V, V

FB

= 0.63V

V

SENSE–

, Force Continuous Operation

V

RNG

= 0V, V

FB

= 0.63V

V

RNG

= INTV

CC

, V

FB

= 0.63V

SENSE

+

, SENSE

–

Voltage Range (Common

Mode)

SENSE

+

, SENSE

–

Input Bias Current

RUN Pin On Threshold

RUN Pin Hysteresis

Soft-Start Charging Current

INTV

CC

Undervoltage Lockout

INTV

CC

Undervoltage Lockout Release

V

OSNS+

Input Bias Current

V

OSNS–

Input Bias Current

V

TRACKSS

= 0V

Falling

Rising

V

FB

= 0.6V

V

FB

= 0.6V

l

V

SENSE(CM)

I

SENSE

V

RUN(TH)

V

RUN(HYS)

I

SS

UVLO

I

VOSNS+

I

VOSNS–

–0.5

±5

1

5.5

±50

4

1.3

V

nA

μA

V

mV

μA

V

SENSE(CM)

= 0.6V

V

SENSE(CM)

= 5V

V

RUN

Rising

l

1.1

1.2

80

1.0

3.4

3.65

4.2

±5

–15

4.0

4.5

±25

–50

V

nA

μA

3613fa

3

LTC3613

ELECTRICAL CHARACTERISTICS

SYMBOL

f

OSC

PARAMETER

Free Running Switching Frequency

Oscillator and Clock Synchronization

R

T

= 205k

R

T

= 80.6k

R

T

= 38.8k

175

450

900

2

0.5

6V < V

IN

< 24V

I

CC

= 0mA to 50mA

EXTV

CC

Rising

V

EXTVCC

= 5V. I

CC

= 50mA

V

FB

Rising (With Respect to Regulated

Feedback Voltage V

REG

)

V

FB

Falling (With Respect to Regulated

Feedback Voltage V

REG

)

V

FB

Returning

I

PGOOD

= 5mA

(Note 5)

5

–10

4.4

5.1

5.3

–1

4.6

200

7.5

–7.5

2

0.15

20

10

7.5

5.5

0.4

10

–5

5.55

–2

4.75

200

500

1000

225

550

1100

kHz

V

%

V

mV

%

V

μs

mohm

The

l

denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at T

A

= 25°C. SV

IN

= 15V, V

FB

= V

OSNS+

– V

OSNS–

, unless otherwise noted. (Note 4)

CONDITIONS

MIN

TYP

MAX

UNITS

CLK

IH

CLK

IL

INTV

CC

INTV

CC(%)

EXTV

CC(TH)

EXTV

CC(HYS)

ΔINTV

CC

PGOOD Output

PGD

OV

PGD

UV

PGD

HYS

V

PGD(LO)

t

PGD(FALL)

t

PGD(RISE)

R

DS(ON)

R

DS(ON)

Clock Input High Level Into Mode/PLLIN

Clock Input Low Level Into Mode/PLLIN

Internal V

CC

Voltage

Internal V

CC

Load Regulation

EXTV

CC

Switchover Voltage

EXTV

CC

Switchover Hysteresis

EXTV

CC

Voltage Drop

PGOOD Upper Threshold

PGOOD Lower Threshold

PGOOD Hysteresis

PGOOD Low Voltage

Delay from OV/UV Fault to PGOOD Falling

Internal V

CC

Regulator and External V

CC

Delay from OV/UV Recovery to PGOOD Rising (Note 5)

Top Switch On-Resistance

Bottom Switch On-Resistance

Note 1:

Stresses beyond those listed under Absolute Maximum Ratings

cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2:

T

J

is calculated from the ambient temperature, T

A

, and power

dissipation, P

D

, as follows:

T

J

= T

A

+ (P

D

• 29°C/W) (θ

JA

is simulated per JESD51-7 high effective

thermal conductivity test board)

θ

JC

=1°C/W (θ

JC

is simulated when heat sink is applied at the bottom

of the package.)

Note 3:

The LTC3613 is tested in a feedback loop that adjusts V

FB

= V

OSNS+

– V

OSNS–

to achieve a specified error amplifier output voltage (ITH).

Note 4:

The LTC3613 is tested under pulsed load conditions such that

T

J

≈ T

A

. The LTC3613E is guaranteed to meet 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

LTC3613I is guaranteed over the full –40°C to 125°C operating junction

temperature range. Note that the maximum ambient temperature

consistent with these specifications is determined by specific operating

conditions in conjunction with board layout, the rated package thermal

impedance and other environmental factors.

Note 5:

Delay times are measured using 50% levels.

3613fa

4

LTC3613

TYPICAL PERFORMANCE CHARACTERISTICS

Transient Response:

Forced Continuous Mode

V

OUT

100mV/DIV

I

L

10A/DIV

T

A

= 25°C unless otherwise noted

Load Release:

Forced Continuous Mode

V

OUT

100mV/DIV

I

L

10A/DIV

I

LOAD

10A/DIV

Load Step:

Forced Continuous Mode

V

OUT

100mV/DIV

I

L

10A/DIV

I

LOAD

10A/DIV

40μs/DIV

LOAD TRANSIENT = 0A TO 15A

V

IN

= 12V, V

OUT

= 1.5V

FIGURE 10 CIRCUIT

3613 G01

I

LOAD

10A/DIV

10μs/DIV

LOAD STEP = 0A TO 15A

V

IN

= 12V, V

OUT

= 1.5V

FIGURE 10 CIRCUIT

3613 G02

10μs/DIV

LOAD RELEASE = 15A TO 0A

V

IN

= 12V, V

OUT

= 1.5V

FIGURE 10 CIRCUIT

3613 G03

Transient Response:

Pulse-Skipping Mode

V

OUT

100mV/DIV

I

L

10A/DIV

I

LOAD

10A/DIV

Load Step: Pulse-Skipping Mode

V

OUT

100mV/DIV

I

L

10A/DIV

I

LOAD

10A/DIV

10μs/DIV

LOAD STEP = 500mA TO 15A

V

IN

= 12V, V

OUT

= 1.5V

FIGURE 10 CIRCUIT

3613 G05

Load Release:

Pulse-Skipping Mode

V

OUT

100mV/DIV

I

L

10A/DIV

I

LOAD

10A/DIV

40μs/DIV

LOAD TRANSIENT = 500mA TO 15A

V

IN

= 12V, V

OUT

= 1.5V

FIGURE 10 CIRCUIT

3613 G04

10μs/DIV

LOAD RELEASE = 15A TO 500mA

V

IN

= 12V, V

OUT

= 1.5V

FIGURE 10 CIRCUIT

3613 G06

Normal Soft Start-Up

Soft Start-Up into

a Pre-Biased Output

Output Tracking

V

IN

5V/DIV

TRACK/SS

500mV/DIV

V

OUT

1V/DIV

4ms/DIV

V

IN

= 12V

V

OUT

= 1.5V

FIGURE 10 CIRCUIT

3613 G07

V

IN

5V/DIV

TRACK/SS

500mV/DIV

V

OUT

1V/DIV

V

OUT

PRE-BIASED TO 0.75V

2ms/DIV

V

IN

= 12V

V

OUT

= 1.5V

FIGURE 10 CIRCUIT

3613 G08

TRACK/SS

500mV/DIV

V

OUT

1V/DIV

V

IN

= 12V

10ms/DIV

V

OUT

= 1.5V

FIGURE 10 CIRCUIT

3613 G09

3613fa

5

参数名称	属性值
Brand Name	Linear Technology
是否Rohs认证	符合
厂商名称	Linear ( ADI )
零件包装代码	QFN
包装说明	HVQCCN, LCC56,.27X.35,20
针数	56
制造商包装代码	WKH
Reach Compliance Code	compliant
ECCN代码	EAR99
其他特性	ALSO OPERATES AS LDO REGULATOR, OPERATES IN ADJUSTABLE MODE FROM 0.6 TO 5.5V
模拟集成电路 - 其他类型	SWITCHING REGULATOR
控制模式	CURRENT-MODE
最大输入电压	24 V
最小输入电压	4.5 V
标称输入电压	15 V
JESD-30 代码	R-PQCC-N56
JESD-609代码	e3
长度	9 mm
功能数量	1
端子数量	56
最高工作温度	125 °C
最低工作温度
最大输出电流	15 A
封装主体材料	PLASTIC/EPOXY
封装代码	HVQCCN
封装等效代码	LCC56,.27X.35,20
封装形状	RECTANGULAR
封装形式	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）	NOT SPECIFIED
认证状态	Not Qualified
座面最大高度	1 mm
表面贴装	YES
切换器配置	BUCK
最大切换频率	1100 kHz
技术	CMOS
温度等级	OTHER
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	7 mm

	LTC3613EWKH#TRPBF	LTC3613IWKH#TRPBF	LTC3613IWKH#PBF	LTC3613EWKH#PBF
描述	IC REG BUCK ADJ 15A SYNC 56QFN	IC REG BUCK ADJ 15A SYNC 56QFN	IC REG BUCK ADJ 15A SYNC 56QFN	可输出电流：15A 开关工作频率：200kHz ~ 1MHz 输出类型：Adjustable 输出电压的路数：1 功能类型：Step-Down 输出配置：Positive
Brand Name	Linear Technology	Linear Technology	Linear Technology	Linear Technology
是否Rohs认证	符合	符合	符合	符合
厂商名称	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )
零件包装代码	QFN	QFN	QFN	QFN
包装说明	HVQCCN, LCC56,.27X.35,20	HVQCCN, LCC56,.27X.35,20	HVQCCN, LCC56,.27X.35,20	HVQCCN, LCC56,.27X.35,20
针数	56	56	56	56
制造商包装代码	WKH	WKH	WKH	WKH
Reach Compliance Code	compliant	compliant	compliant	compliant
ECCN代码	EAR99	EAR99	EAR99	EAR99
其他特性	ALSO OPERATES AS LDO REGULATOR, OPERATES IN ADJUSTABLE MODE FROM 0.6 TO 5.5V	ALSO OPERATES AS LDO REGULATOR, OPERATES IN ADJUSTABLE MODE FROM 0.6 TO 5.5V	ALSO OPERATES AS LDO REGULATOR, OPERATES IN ADJUSTABLE MODE FROM 0.6 TO 5.5V	ALSO OPERATES AS LDO REGULATOR, OPERATES IN ADJUSTABLE MODE FROM 0.6 TO 5.5V
模拟集成电路 - 其他类型	SWITCHING REGULATOR	SWITCHING REGULATOR	SWITCHING REGULATOR	SWITCHING REGULATOR
控制模式	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE
最大输入电压	24 V	24 V	24 V	24 V
最小输入电压	4.5 V	4.5 V	4.5 V	4.5 V
标称输入电压	15 V	15 V	15 V	15 V
JESD-30 代码	R-PQCC-N56	R-PQCC-N56	R-PQCC-N56	R-PQCC-N56
JESD-609代码	e3	e3	e3	e3
长度	9 mm	9 mm	9 mm	9 mm
功能数量	1	1	1	1
端子数量	56	56	56	56
最高工作温度	125 °C	125 °C	125 °C	125 °C
最大输出电流	15 A	15 A	15 A	15 A
封装主体材料	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
封装代码	HVQCCN	HVQCCN	HVQCCN	HVQCCN
封装等效代码	LCC56,.27X.35,20	LCC56,.27X.35,20	LCC56,.27X.35,20	LCC56,.27X.35,20
封装形状	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
封装形式	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED
认证状态	Not Qualified	Not Qualified	Not Qualified	Not Qualified
座面最大高度	1 mm	1 mm	1 mm	1 mm
表面贴装	YES	YES	YES	YES
切换器配置	BUCK	BUCK	BUCK	BUCK
最大切换频率	1100 kHz	1100 kHz	1100 kHz	1100 kHz
技术	CMOS	CMOS	CMOS	CMOS
温度等级	OTHER	AUTOMOTIVE	AUTOMOTIVE	OTHER
端子面层	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)
端子形式	NO LEAD	NO LEAD	NO LEAD	NO LEAD
端子节距	0.5 mm	0.5 mm	0.5 mm	0.5 mm
端子位置	QUAD	QUAD	QUAD	QUAD
处于峰值回流温度下的最长时间	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED
宽度	7 mm	7 mm	7 mm	7 mm

LTC3613EWKH#TRPBF

LTC3613EWKH#TRPBF概述

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