LTC3630AHDHC#PBF datasheet, PDF

LTC3630A

High Efficiency, 76V

500mA Synchronous

Step-Down Converter

FeaTures

n

DescripTion

The

LTC

®

3630A

is a high efficiency step-down DC/DC

converter with internal high side and synchronous power

switches that draws only 12μA typical DC supply current

while maintaining a regulated output voltage at no load.

The LTC3630A can supply up to 500mA load current and

features a programmable peak current limit that provides

a simple method for optimizing efficiency and for reduc-

ing output ripple and component size. The LTC3630A’s

combination of Burst Mode

®

operation, integrated power

switches, low quiescent current, and programmable peak

current limit provides high efficiency over a broad range

of load currents.

With its wide input range of 4V to 76V, the LTC3630A is

a robust converter suited for regulating a wide variety of

power sources. A feedback comparator output enables

multiple LTC3630As to be paralleled in higher current

applications.

The LTC3630A is available in the thermally-enhanced

3mm × 5mm DFN and the MSE16 packages.

PARAMETER

Maximum Operating V

IN

Absolute Maximum V

IN

LTC3630A

76V

80V

LTC3630

65V

70V

Wide Operating Input Voltage Range: 4V to 76V

Synchronous Operation for Highest Efficiency

Internal High Side and Low Side Power MOSFETs

No Compensation Required

Adjustable 50mA to 500mA Maximum Output Current

Low Dropout Operation: 100% Duty Cycle

Low Quiescent Current: 12µA

Wide Output Range: 0.8V to V

IN

0.8V ±1% Feedback Voltage Reference

Precise RUN Pin Threshold

Internal and External Soft-Start

Programmable 1.8V, 3.3V, 5V or Adjustable Output

Few External Components Required

Low Profile (0.75mm) 3mm × 5mm DFN and

Thermally-Enhanced MSE16 Packages

applicaTions

n

Industrial Control Supplies

Medical Devices

Portable Instruments

Automotive

Avionics

L,

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

and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

Typical applicaTion

12.5V to 76V Input to 12V Output, 500mA Step-Down Converter

V

IN

12.5V TO 76V

22µH

V

IN

2.2µF

RUN

I

SET

FBO

GND

3630a TA01a

Efficiency and Power Loss vs Load Current

100

90

80

EFFICIENCY (%)

70

60

50

40

30

20

10

0

0.1

1

V

IN

= 24V 1

V

IN

= 76V

10

100

LOAD CURRENT (mA)

1000

3630a TA01b

V

OUT

= 12V

EFFICIENCY

SW

LTC3630A

V

FB

SS

V

PRG1

V

PRG2

147k

200k

22µF

V

OUT

12V

500mA

1000

POWER LOSS (mW)

POWER LOSS

100

10

3630afc

For more information

www.linear.com/LTC3630A

1

LTC3630A

absoluTe MaxiMuM raTings

(Note 1)

V

IN

Supply Voltage ..................................... –0.3V to 80V

RUN Voltage................................................. –0.3V to 6V

SS, FBO, I

SET

Voltages ................................. –0.3V to 6V

V

FB

, V

PRG1

, V

PRG2

Voltages ......................... –0.3V to 6V

Operating Junction Temperature Range (Notes 2, 3, 4)

LTC3630AE, LTC3630AI .................... –40°C to 125°C

LTC3630AH ....................................... –40°C to 150°C

LTC3630AMP..................................... –55°C to 150°C

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

Lead Temperature (Soldering, 10 sec)

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

pin conFiguraTion

TOP VIEW

SW 1

V

IN

3

RUN

V

PRG2

V

PRG1

GND

5

6

7

8

17

GND

16 GND

14 GND

12

11

10

9

FBO

I

SET

SS

V

FB

SW

NC

V

IN

NC

RUN

V

PRG2

V

PRG1

GND

1

2

3

4

5

6

7

8

17

GND

16 GND

15 NC

14 GND

13 NC

12 FBO

11 I

SET

10 SS

9

V

FB

MSE PACKAGE

VARIATION: MSE16 (12)

16-LEAD PLASTIC MSOP

T

JMAX

= 150°C,

θ

JA

= 45°C/W,

θ

JC

= 10°C/W

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

DHC PACKAGE

16-LEAD (5mm

×

3mm) PLASTIC DFN

(NOTE 6)

T

JMAX

= 150°C,

θ

JA

= 43°C/W,

θ

JC

= 5°C/W

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

orDer inForMaTion

LEAD FREE FINISH

LTC3630AEMSE#PBF

LTC3630AIMSE#PBF

LTC3630AHMSE#PBF

LTC3630AMPMSE#PBF

LTC3630AEDHC#PBF

LTC3630AIDHC#PBF

LTC3630AHDHC#PBF

LTC3630AMPDHC#PBF

TAPE AND REEL

LTC3630AEMSE#TRPBF

LTC3630AIMSE#TRPBF

LTC3630AHMSE#TRPBF

LTC3630AMPMSE#TRPBF

LTC3630AEDHC#TRPBF

LTC3630AIDHC#TRPBF

LTC3630AHDHC#TRPBF

LTC3630AMPDHC#TRPBF

PART MARKING*

3630A

PACKAGE DESCRIPTION

16-Lead Plastic MSOP

16-Lead (5mm × 3mm) Plastic DFN

TEMPERATURE RANGE

–40°C to 125°C

–40°C to 150°C

–55°C to 150°C

–40°C to 125°C

–40°C to 150°C

–55°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.

Consult LTC Marketing for information on nonstandard 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/

3630afc

2

For more information

www.linear.com/LTC3630A

LTC3630A

elecTrical characTerisTics

SYMBOL

V

IN

V

OUT

UVLO

PARAMETER

Input Voltage Operating Range

Output Voltage Operating Range

V

IN

Undervoltage Lockout

DC Supply Current (Note 5)

Active Mode

Sleep Mode

Shutdown Mode

RUN Pin Threshold Voltage

(Note 7)

V

IN

Rising

V

IN

Falling

Hysteresis

l

The

l

denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at T

A

= 25°C (Note 2). V

IN

= 12V, unless otherwise noted.

CONDITIONS

MIN

4

0.8

3.45

3.30

3.65

3.5

150

165

12

5

1.17

1.06

1.21

1.10

110

TYP

MAX

76

V

IN

3.85

3.70

UNITS

V

mV

µA

V

mV

Input Supply (V

IN

)

I

Q

No Load

V

RUN

= 0V

RUN Rising

RUN Falling

Hysteresis

V

FB

Rising, V

PRG1

= V

PRG2

= 0V

LTC3630AE, LTC3630AI

LTC3630AH, LTC3630AMP

V

FB

Falling, V

PRG1

= V

PRG2

= 0V

V

FB

= 1V, V

PRG1

= 0V, V

PRG2

= 0V

V

FB

Rising, V

PRG1

= SS, V

PRG2

= 0V

V

FB

Falling, V

PRG1

= SS, V

PRG2

= 0V

V

FB

Rising, V

PRG1

= 0V, V

PRG2

= SS

V

FB

Falling, V

PRG1

= 0V, V

PRG2

= SS

V

FB

Rising, V

PRG1

= V

PRG2

= SS

V

FB

Falling, V

PRG1

= V

PRG2

= SS

l

350

20

10

1.25

1.14

V

RUN

Output Supply (V

FB

)

V

FB(ADJ)

V

FBH

I

FB

V

FB(FIXED)

Feedback Comparator Threshold Voltage

(Adjustable Output)

Feedback Comparator Hysteresis

(Adjustable Output)

Feedback Pin Current

Feedback Comparator Threshold Voltages

(Fixed Output)

l

0.792

0.788

2.5

–10

4.940

4.910

3.260

3.240

1.780

1.770

0.800

5

0

5.015

4.985

3.310

3.290

1.810

1.8

0.001

0.808

0.812

7

10

5.090

5.060

3.360

3.340

1.840

1.83

V

mV

nA

V

%/V

∆V

LINEREG

Operation

I

PEAK

R

ON

I

LSW

I

SS

t

INT(SS)

Feedback Voltage Line Regulation

Peak Current Comparator Threshold

V

IN

= 4V to 76V

I

SET

Floating

100k Resistor from I

SET

to GND

I

SET

Shorted to GND

I

SW

= –200mA

I

SW

= 200mA

RUN = Open, V

IN

= 65V, SW = 0V

V

SS

< 2.5V

SS Pin Floating

3

l

1

0.45

0.09

1.2

0.6

0.12

1.00

0.53

0.1

5

0.8

1.4

0.75

0.15

A

Ω

Power Switch On-Resistance

Top Switch

Bottom Switch

Switch Pin Leakage Current

Soft-Start Pin Pull-Up Current

Internal Soft-Start Time

1

6

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 LTC3630A is tested under pulsed load conditions such that

T

J

≈ T

A

. The LTC3630AE 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 LTC3630AI is guaranteed

over the –40°C to 125°C operating junction temperature range, the

LTC3630AH is guaranteed over the –40°C to 150°C operating junction

temperature range and the LTC3630AMP is tested and guaranteed over the

–55°C to 150°C operating junction temperature range.

High junction temperatures degrade operating lifetimes; operating lifetime

is derated for junction temperatures greater than 125°C. 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 3:

The junction temperature (T

J

, in °C) is calculated from the ambient

temperature (T

A

, in °C) and power dissipation (P

D

, in Watts) according to

the formula:

T

J

= T

A

+ (P

D

•

θ

JA

)

where

θ

JA

is 43°C/W for the DFN or 45°C/W for the MSOP.

3630afc

For more information

www.linear.com/LTC3630A

3

LTC3630A

elecTrical characTerisTics

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 4:

This IC includes over temperature protection that is intended to

protect the device during momentary overload conditions. The maximum

rated junction temperature will be exceeded when this protection is active.

Continuous operation above the specified absolute maximum operating

junction temperature may impair device reliability or permanently damage

the device. The overtemperature protection level is not production tested.

Note 5:

Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency. See Applications Information.

Note 6:

For application concerned with pin creepage and clearance

distances at high voltages, the MSOP package should be used. See

Applications Information.

Note 7:

At very high input voltages, the minimum output voltage that can

be maintained is limited to V

IN

– 65V if the load current is less than 5mA.

Refer to the High Input Voltage Considerations in the Operation section.

Typical perForMance characTerisTics

Soft-Start Waveform

OUTPUT

VOLTAGE

2V/DIV

OUTPUT

VOLTAGE

50mV/DIV

Load Step Transient Response

OUTPUT

VOLTAGE

2V/DIV

Short-Circuit Response

INDUCTOR

CURRENT

500mA/DIV

C

OUT

= 100µF

1ms/DIV

FIGURE 13 CIRCUIT

3630a G01

LOAD

CURRENT

200mA/DIV

V

IN

= 12V

500µs/DIV

V

OUT

= 5V

FIGURE 13 CIRCUIT

3630a G02

INDUCTOR

CURRENT

500mA/DIV

V

IN

= 12V

200µs/DIV

V

OUT

= 5V

FIGURE 13 CIRCUIT

3630a G03

Efficiency and Power Loss

vs Load Current, V

OUT

= 5V

100

90

80

EFFICIENCY (%)

70

60

50

40

30

20

10

0

0.1

POWER LOSS

10

100

EFFICIENCY

100

90

1000

POWER LOSS (mW)

EFFICIENCY (%)

80

70

60

50

40

30

20

10

Efficiency and Power Loss

vs Load Current, V

OUT

= 3.3V

100

EFFICIENCY

Efficiency and Power Loss

vs Load Current, V

OUT

= 1.8V

V

OUT

= 1.8V

90 FIGURE 13 CIRCUIT

80

EFFICIENCY (%)

70

60

50

40

30

20

10

0

0.1

1

V

IN

= 12V

V

IN

= 67V

10

100

LOAD CURRENT (mA)

POWER LOSS

10

1

0.1

1000

100

POWER LOSS (mW)

EFFICIENCY

1000

POWER LOSS (mW)

1000

100

10

POWER LOSS

V

OUT

= 5V

FIGURE 13 CIRCUIT 1

V

IN

= 12V

V

IN

= 70V

0.1

1

10

100

1000

LOAD CURRENT (mA)

3630a G04

0

0.1

V

OUT

= 3.3V

FIGURE 13 CIRCUIT 1

V

IN

= 12V

V

IN

= 68V

0.1

1

10

100

1000

LOAD CURRENT (mA)

3630a G05

3630a G06

3630afc

4

For more information

www.linear.com/LTC3630A

LTC3630A

Typical perForMance characTerisTics

Efficiency vs Input Voltage

95

90

85

80

75

70

65

60

55

10

20

I

LOAD

= 500mA

I

LOAD

= 100mA

I

LOAD

= 10mA

I

LOAD

= 1mA

30

50

60

40

INPUT VOLTAGE (V)

70

3630a G07

Line Regulation vs Input Voltage

0.05

0.04

0.03

∆V

OUT

/V

OUT

(%)

0.02

0.01

0

–0.01

–0.02

–0.03

–0.04

–0.05

5

15

35

45

55

25

INPUT VOLTAGE (V)

65

75

OUTPUT VOLTAGE (V)

FIGURE 13 CIRCUIT

I

LOAD

= 500mA

5.04

5.03

5.02

5.01

5.00

4.99

4.98

4.97

4.96

Load Regulation vs Load Current

V

IN

= 12V

V

OUT

= 5V

FIGURE 13 CIRCUIT

V

OUT

= 5V

FIGURE 13 CIRCUIT

EFFICIENCY (%)

0

100

200

400

300

LOAD CURRENT (mA)

500

3630a G09

3630a G08

Feedback Comparator Trip

Voltage vs Temperature

FEEDBACK COMPARATOR TRIP VOLTAGE (V)

V

IN

= 12V

FEEDBACK COMPARATOR HYSTERESIS (mV)

0.804

5.5

5.4

5.3

5.2

5.1

5.0

4.9

4.8

4.7

4.6

Feedback Comparator Hysteresis

vs Temperature

PEAK CURRENT TRIP THRESHOLD (mA)

V

IN

= 12V

1400

1200

1000

800

600

400

200

Peak Current Trip Threshold

vs Temperature and I

SET

V

IN

= 12V

I

SET

OPEN

0.802

0.800

R

ISET

= 100k

0.798

I

SET

= GND

–25

65

95

5

35

TEMPERATURE (°C)

125

155

0.796

–55

–25

95

5

35

65

TEMPERATURE (°C)

125

155

4.5

–55

–25

65

35

5

95

TEMPERATURE (°C)

125

155

0

–55

3630a G10

3630a G11

3630a G12

Peak Current Trip Threshold

vs R

ISET

1400

PEAK CURRENT TRIP THRESHOLD (mA)

1200

1000

800

600

400

200

0

50

100

150

200

250

3630a G13

Peak Current Trip Threshold

vs Input Voltage

1400

PEAK CURRENT TRIP THRESHOLD (mA)

1200

V

IN

SUPPLY CURRENT (µA)

1000

800

600

400

200

0

I

SET

= 0V

0

10

20 30 40 50 60

INPUT VOLTAGE (V)

70

3630a G14

Quiescent V

IN

Supply Current

vs Input Voltage

16

14

12

10

8

6

4

2

0

5

15

25

35

45

55

65

75

SHUTDOWN

SLEEP

V

IN

= 12V

I

SET

= OPEN

I

SET

= 100k

R

ISET

(k )

V

IN

VOLTAGE (V)

3630a G15

3630afc

For more information

www.linear.com/LTC3630A

5

Parameter Name	Attribute value
EU restricts the use of certain hazardous substances	Compliant
ECCN (US)	EAR99
Part Status	Active
HTS	8542.39.00.01
Type	Synchronous Step Down
Output Type	Adjustable
Switching Frequency (kHz)	50 to 250
Switching Regulator	Yes
Number of Outputs	1
Output Voltage (V)	0.8 to 76
Maximum Output Current (A)	0.5
Minimum Input Voltage (V)	4
Maximum Input Voltage (V)	76
Operating Supply Voltage (V)	4 to 76
Typical Quiescent Current (uA)	12
Minimum Operating Temperature (°C)	-40
Maximum Operating Temperature (°C)	150
Supplier Temperature Grade	Automotive
Packaging	Tube
Pin Count	16
Standard Package Name	DFN
Supplier Package	DFN EP
Mounting	Surface Mount
Package Height	0.75(Max)
Package Length	5
Package Width	3
PCB changed	16
Lead Shape	No Lead

LTC3630AHDHC#PBF

LTC3630AHDHC#PBF Overview

LTC3630AHDHC#PBF Parametric

Preview

Recommended Resources