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FEATURES

n

LTC3604

2.5A, 15V Monolithic

Synchronous Step-Down

Regulator

DESCRIPTION

The LTC

®

3604 is a high efﬁciency, monolithic synchronous

buck regulator using a phase-lockable controlled on-time,

current mode architecture capable of supplying up to 2.5A

of output current. The operating supply voltage range is

from 3.6V to 15V, making it suitable for a wide range of

power supply applications.

The operating frequency is programmable from 800kHz to

4MHz with an external resistor enabling the use of small

surface mount inductors. For switching noise sensitive

applications, the LTC3604 can be externally synchronized

over the same frequency range. An internal phase-locked

loop aligns the on-time of the top power MOSFET to the

internal or external clock. This unique constant frequency/

controlled on-time architecture is ideal for high step-down

ratio applications that demand high switching frequencies

and fast transient response.

The LTC3604 offers two operational modes: Burst Mode

operation and forced continuous mode to allow the user

to optimize output voltage ripple, noise, and light load

efﬁciency for a given application. Maximum light load

efﬁciency is achieved with the selection of Burst Mode

operation while forced continuous mode provides minimum

output ripple and constant frequency operation.

n

3.6V to 15V Operating Input Voltage Range

2.5A Output Current

Up to 95% Efﬁciency

Very Low Duty Cycle Operation: 5% at 2.25MHz

Adjustable Switching Frequency: 800kHz to 4MHz

External Frequency Synchronization

Current Mode Operation for Excellent Line and Load

Transient Response

User Selectable Low Ripple (20mV

P-P

Typical)

Burst Mode

®

(No Load I

Q

= 300μA) or Forced

Continuous Operation

0.6V Reference Allows Low Output Voltages

Short-Circuit Protected

Output Voltage Tracking Capability

Power Good Status Output

Available in Small, Thermally Enhanced, 16-Pin QFN

(3mm

×

3mm) and MSOP Packages

APPLICATIONS

n

Distributed Power Systems

Lithium-Ion Battery-Powered Instruments

Point-of-Load Power Supplies

L,

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

and Hot Swap is a registered trademark of Linear Technology Corporation. All other trademarks

are the property of their respective owners. Protected by U.S. Patents, including 5481178,

5847554, 6580258, 6304066, 6476589, 6774611.

TYPICAL APPLICATION

High Efﬁciency 2.5A Step-Down Regulator

V

IN

3.6V TO 15V

22μF

V

IN

RUN

PGOOD

TRACK/SS

LTC3604

2.2μF

INTV

CC

FB

ITH

RT

MODE/SYNC

SGND

PGND

BOOST

V

OUT

3.3V

2.5A

47μF

EFFICIENCY (%)

0.1μF

1μH

SW

V

ON

180k

Efﬁciency and Power Loss vs Load Current

100

90

80

70

60

50

40

30

40k

3604 TA01a

10

1

POWER LOSS (W)

22pF

0.1

20

10

0

0.001

V

IN

= 5V 0.01

V

IN

= 12V

f

O

= 2MHz

Burst Mode OPERATION

0.01

0.1

1

LOAD CURRENT (A)

10

3604 TA01b

0.001

3604f

1

LTC3604

ABSOLUTE MAXIMUM RATINGS

(Note 1)

V

IN

............................................................. –0.3V to 16V

V

IN

Transient Voltage ................................................18V

BOOST .................................................... –0.3V to 18.6V

BOOST-SW................................................ –0.3V to 3.6V

INTV

CC

...................................................... –0.3V to 3.6V

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

CC

+ 0.3V

MODE/SYNC, FB ........................–0.3V to INTV

CC

+ 0.3V

TRACK/SS .................................–0.3V to INTV

CC

+ 0.3V

PGOOD, V

ON

............................................... –0.3V to 16V

SW, RUN .......................................... –0.3V to V

IN

+ 0.3V

SW Source Current (DC) .............................................3A

Peak SW Source Current .................... Internally Limited

Operating Junction Temperature Range

(Notes 2, 3, 5) ....................................... –40°C to 125°C

Storage Temperature Range .................. –65°C to 125°C

Lead Temperature (Soldering, 10 sec)

MSOP ............................................................... 300°C

PIN CONFIGURATION

TOP VIEW

TRACK/SS

RUN

V

IN

V

IN

TOP VIEW

12 ITH

17

PGND

11 FB

10 RT

9

5

NC

6

BOOST

7

INTV

CC

8

V

ON

SGND

SW

PGND

BOOST

INTV

CC

V

ON

RT

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

PGOOD

MODE/SYNC

V

IN

V

IN

RUN

TRACK/SS

I

TH

FB

16 15 14 13

MODE/SYNC 1

PGOOD 2

SW 3

SW 4

17

SGND

MSE PACKAGE

16-LEAD PLASTIC MSOP

T

JMAX

= 125°C,

θ

JA

= 38°C/W

EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB

UD PACKAGE

16-LEAD (3mm 3mm) PLASTIC QFN

T

JMAX

= 125°C,

θ

JA

= 45°C/W

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

ORDER INFORMATION

LEAD FREE FINISH

LTC3604EUD#PBF

LTC3604IUD#PBF

LTC3604EMSE#PBF

LTC3604IMSE#PBF

TAPE AND REEL

LTC3604EUD#TRPBF

LTC3604IUD#TRPBF

LTC3604EMSE#TRPBF

LTC3604IMSE#TRPBF

PART MARKING*

LFPT

3604

PACKAGE DESCRIPTION

16-Lead (3mm

×

3mm) Plastic QFN

16-Lead (3mm

×

3mm) Plastic QFN

16-Lead Plastic MSOP

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.

Consult LTC Marketing for information on non-standard lead based ﬁnish parts.

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/

3604f

2

LTC3604

ELECTRICAL CHARACTERISTICS

SYMBOL

V

VIN

I

Q

PARAMETER

Input Supply Range

Input DC Supply Current

Forced Continuous Operation

Sleep Current

Shutdown

Feedback Reference Voltage

Reference Voltage Line Regulation

Output Voltage Load Regulation

Feedback Pin Input Current

Error Ampliﬁer Transconductance

Minimum On-Time

Minimum Off-Time

Valley Switch Current Limit

Oscillator Frequency

The

l

denotes the speciﬁcations which apply over the full operating

junction temperature range, otherwise speciﬁcations are at T

J

= 25°C. V

VIN

= 12V, unless otherwise speciﬁed.

CONDITIONS

l

MIN

3.6

TYP

MAX

15

1000

500

25

0.606

UNITS

V

μA

V

%/V

%

nA

mS

ns

A

MHz

mΩ

V

%

V

μA

%

μs

Ω

μA

μs

mV

μA

V

μA

MODE = 0V

MODE = INTV

CC

, V

FB

> 0.6V

RUN = 0V

l

V

FB

ΔV

LINEREG

ΔV

LOADREG

I

FB

g

m(EA)

t

ON(MIN)

t

OFF(MIN)

I

LIM

f

OSC

0.594

V

VIN

= 3.6V to 15V

ITH = 0.6V to 1.6V

V

FB

= 0.6V

ITH = 1.2V

V

ON

= 1V, V

IN

= 4V

V

IN

= 6V

V

RT

= INTV

CC

R

RT

= 160k

R

RT

= 80k

2.6

1.4

1.7

3.4

700

300

14

0.600

0.01

0.1

±30

2.0

20

40

3.4

2

4

130

100

17.5

16.5

3.3

0.6

2.75

2.45

1.25

1.0

0

8

–8

–5

5

40

15

0.01

400

0.3

1.4

60

4.3

2.6

2.3

4.6

R

DS(ON)

V

VIN(OV)

V

INTVCC

ΔINTV

CC

V

UVLO

V

RUN

I

RUN(LKG)

V

FB_GB

V

FB_BG

t

PGOOD

R

PGOOD

I

SW(LKG)

t

SS

V

FB_TRACK

I

TRACK

V

MODE/SYNC

Top Switch On-Resistance

Bottom Switch On-Resistance

V

IN

Overvoltage Lockout Threshold

INTV

CC

Voltage

INTV

CC

Load Regulation (Note 4)

INTV

CC

Undervoltage Lockout

Threshold

RUN Threshold

RUN Leakage Current

PGOOD Good-to-Bad Threshold

PGOOD Bad-to-Good Threshold

Power Good Filter Time

PGOOD Pull-Down Resistance

Switch Leakage Current

Internal Soft-Start Time

TRACK Pin

TRACK Pull-Up Current

MODE Threshold Voltage

SYNC Threshold Voltage

MODE Input Current

V

IN

Rising

V

IN

Falling

3.6V < V

IN

< 15V

I

INTVCC

= 0mA to 20mA

INTV

CC

Rising, V

IN

= INTV

CC

INTV

CC

Falling, V

IN

= INTV

CC

RUN Rising

RUN Falling

V

VIN

= 15V

FB Rising

FB Falling

FB Rising

FB Falling

10mA Load

V

RUN

= 0V

V

FB

from 10% to 90% Full Scale

TRACK = 0.3V

MODE V

IH

MODE V

IL

SYNC V

IH

MODE = 0V

MODE = INTV

CC

l

16.8

15.8

3.13

18

17

3.45

2.9

1.29

1.03

±3

10

–10

l

1.21

0.97

–3

3

20

0.28

l

1

700

0.315

1.0

0.4

0.95

–1.5

1.5

I

MODE

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 LTC3604E is guaranteed to meet performance speciﬁcations

from 0°C to 85°C. Speciﬁcations over the –40°C to 125°C operating

junction temperature range are assured by design, characterization, and

correlation with statistical process controls. The LTC3604I is guaranteed

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.

3604f

3

LTC3604

ELECTRICAL CHARACTERISTICS

Note 3:

T

J

is calculated from the ambient temperature, T

A

, and power

dissipation, P

D

, according to the following formula:

T

J

= T

A

+ (P

D

•

θ

JA

)

where

θ

JA

= 45°C/W for the QFN package and

θ

JA

= 38°C/W for the MSOP

package.

Note 4:

Maximum allowed current draw when used as a regulated output

is 5mA. This supply is only intended to provide additional DC load current

as needed and not intended to regulate large transient or ac behavior as

these waveforms may impact LTC3604 operation.

Note 5:

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

T

A

= 25°C, V

IN

= 12V, f

O

= 1MHz, L = 1.5μH unless otherwise noted.

Efﬁciency vs Load Current

Burst Mode Operation

100

90

80

EFFICIENCY (%)

70

60

50

40

30

20

10

0

0.001

0.01

0.1

1

LOAD CURRENT (A)

V

IN

= 4V

V

IN

= 8V

V

IN

= 12V

10

3604 G01

Efﬁciency vs Load Current

Forced Continuous Mode

100

90

80

EFFICIENCY (%)

70

60

50

40

30

20

10

0

0.001

0.01

0.1

1

LOAD CURRENT (A)

V

IN

= 4V

V

IN

= 8V

V

IN

= 12V

10

3604 G02

Efﬁciency vs Load Current

100

90

80

70

60

50

40

30

20

10

0

0.001

V

OUT

= 3.3V

V

OUT

= 5V

0.01

0.1

1

LOAD CURRENT (A)

10

3604 G03

V

OUT

= 1.8V

V

OUT

= 1.8V

BURST

FORCED

CONTINUOUS

Efﬁciency vs Input Voltage

Burst Mode Operation

100

95

90

EFFICIENCY (%)

85

80

75

70

65

60

4

I

LOAD

= 500mA

I

LOAD

= 100mA

I

LOAD

= 10mA

I

LOAD

= 2.5A

6

12

10

INPUT VOLTAGE (V)

8

14

16

3604 G04

Efﬁciency vs Frequency

Forced Continuous Mode

94

92

EFFICIENCY (%)

90

88

86

84

82

0.5

1

1.5

2

FREQUENCY (MHz)

2.5

3

3604 G05

Reference Voltage vs

Temperature

0.605

V

OUT

= 1.8V

I

LOAD

= 800mA

0.603

L = 0.68μH

V

REF

(V)

L = 1.5μH

0.601

0.599

0.597

0.595

–50

–25

50

25

0

75

TEMPERATURE (°C)

100

125

3604 G06

3604f

4

LTC3604

TYPICAL PERFORMANCE CHARACTERISTICS

T

A

= 25°C, V

IN

= 12V, f

O

= 1MHz, L = 1.5μH unless otherwise noted.

Quiescent Current vs

Supply Voltage

380

R

DS(ON)

vs Temperature

200

6000

5000

SWITCH LEAKAGE (nA)

TOP SWITCH

R

DS(ON)

Switch Leakage vs Temperature

V

DS

= 12V

QUIESCENT CURRENT (μA)

160

R

DS(ON)

(mΩ)

340

4000

3000

2000

TOP SWITCH

1000

BOTTOM SWITCH

0

–50

120

BOTTOM SWITCH

R

DS(ON)

300

80

260

40

0

–50

–25

50

25

0

75

TEMPERATURE (°C)

100

125

220

–25

50

25

75

0

TEMPERATURE (°C)

100

125

4

6

8

10

12

SUPPLY VOLTAGE (V)

14

16

3604 G09

3604 G07

3604 G08

Oscillator Frequency vs

Temperature

2.0

1.5

FREQUENCY VARIATION (%)

1.0

FREQUENCY (MHz)

2.75

2.50

2.25

Oscillator Internal Set Frequency

vs Temperature

RT = INTV

CC

2.0

1.8

1.6

I

TRACK

(μA)

50

25

75

0

TEMPERATURE (°C)

100

125

1.4

1.2

1.0

0.8

TRACK Pull-Up Current

vs Temperature

0.5

0

–0.5

–1.0

–1.5

–2.0

–50 –25

0

75

50

25

TEMPERATURE (°C)

100

125

2.00

1.75

1.50

1.25

–50 –25

0.6

–50 –25

50

25

75

0

TEMPERATURE (°C)

100

125

3604 G10

3604 G11

3604 G12

Bottom Switch Valley Current

Limit vs Temperature

5

1.4

1.2

4

1.0

V

OUT

/V

OUT

(%)

I

LIM

(A)

3

0.8

0.6

0.4

0.2

0

–50 –25

0

25 50 75 100 125 150

TEMPERATURE (°C)

3604 G13

Load Regulation

Burst Mode OPERATION

FORCED CONTINUOUS

2

1

–0.2

0

0.5

1

1.5

LOAD CURRENT (A)

2

2.5

3604 G14

3604f

5

LTC3604EUDPBF

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