LTC3536

1A Low Noise, Buck-Boost

DC/DC Converter

FeaTures

n

DescripTion

The LTC

®

3536 is an extended V

IN

range, fixed frequency,

synchronous buck-boost DC/DC converter that operates

from input voltages above, below or equal to the regulated

output voltage. The topology incorporated in the LTC3536

provides low noise operation, making it ideal for RF and

precision measurement applications.

The device can produce up to 1A of continuous output

current, and it includes two N-channel and two P-channel

MOSFET switches. Switching frequencies up to 2MHz can

be programmed with an external resistor and the oscilla-

tor can be synchronized to an external clock. Quiescent

current is only 32µA in Burst Mode operation, maximizing

battery life in portable applications. Burst Mode operation

is user controlled and improves efficiency at light loads.

Other features include a 1µA shutdown current, internal

soft-start, overtemperature protection and current limit.

The LTC3536 is available in 12-pin thermally enhanced

MSOP and 10-pin (3mm

×

3mm) DFN packages.

L,

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

trademarks and PowerPath and No R

SENSE

are trademarks of Linear Technology Corporation. All

other trademarks are the property of their respective owners.

n

Regulated Output with Input Voltage Above, Below

or Equal to the Output Voltage

1.8V to 5.5V Input and Output Voltage Range

1A Continuous Output Current for

V

IN

≥ 3V, V

OUT

= 3.3V

±1% Output Voltage Accuracy

Low Noise Buck-Boost Architecture

Up to 95% Efficiency

Programmable Frequency from 300kHz to 2MHz

Synchronizable Oscillator

Burst Mode

®

Operation: 32µA I

Q

Internal 1ms Soft-Start

Output Disconnect in Shutdown

Shutdown Current: 1µA

Short-Circuit Protection

Small Thermally Enhanced 12-Pin MSOP

and 10-Pin (3mm

×

3mm) DFN Packages

applicaTions

n

Wireless Inventory Terminals

Handheld Medical Instruments

Wireless Locators, Microphones

Supercapacitor Backup Power Supply

Typical applicaTion

100

4.7µH

SW1

V

IN

SW2

V

OUT

V

OUT

3.3V

1A FOR V

IN

≥ 3V

1000k

22µF

95

90

EFFICIENCY (%)

85

80

75

70

65

60

55

3536 TA01a

Efficiency vs Input Voltage

I

LOAD

= 200mA

V

IN

1.8V TO 5.5V

LTC3536

PWM BURST

OFF ON

MODE/SYNC FB

SHDN

RT

VC

PGND SGND

47pF

6.49k

49.9k

220pF

I

LOAD

= 1A

10µF

221k

50

1.5

2

2.5

3 3.5

4 4.5

INPUT VOLTAGE (V)

5

5.5

3536 TA01b

3536fa

1

LTC3536

absoluTe MaxiMuM raTings

(Note 1)

V

IN

, V

OUT

, (SV

IN

, PV

IN

) Voltage .................... –0.3V to 6V

SW1, SW2 Voltage

DC............................................................ –0.3V to 6V

Pulsed (<100ns) ........................................–1.0V to 7V

VC, RT, FB,

SHDN

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

MODE/SYNC Voltage ................................... –0.3V to 6V

Operating Junction Temperature Range

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

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

Lead Temperature (Soldering, 10 sec)

MSE .................................................................. 300°C

pin conFiguraTion

TOP VIEW

RT

SGND

MODE/SYNC

SW1

SW2

1

2

3

4

5

11

PGND

10 VC

9 FB

8

SHDN

7 V

IN

6 V

OUT

RT

SGND

MODE/SYNC

SW1

PGND

SW2

1

2

3

4

5

6

TOP VIEW

12

11

10

9

8

7

VC

FB

SHDN

V

IN

V

IN

V

OUT

13

PGND

DD PACKAGE

10-LEAD (3mm

×

3mm) PLASTIC DFN

T

JMAX

= 125°C,

θ

JA

= 39.7°C/W

EXPOSED PAD (PIN 11) IS PGND, MUST BE SOLDERED TO PCB

MSE PACKAGE

12-LEAD PLASTIC MSOP

T

JMAX

= 125°C,

θ

JA

= 40°C/W

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

FOR RATED THERMAL PERFORMANCE AND LOAD REGULATION

orDer inForMaTion

LEAD FREE FINISH

LTC3536EDD#PBF

LTC3536IDD#PBF

LTC3536EMSE#PBF

LTC3536IMSE#PBF

TAPE AND REEL

LTC3536EDD#TRPBF

LTC3536IDD#TRPBF

LTC3536EMSE#TRPBF

LTC3536IMSE#TRPBF

PART MARKING*

LFZD

3536

PACKAGE DESCRIPTION

10-Lead (3mm

×

3mm) Plastic DFN

10-Lead (3mm

×

3mm) Plastic DFN

12-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/

The

l

denotes the specifications which apply over the full operating junction

temperature range, otherwise specifications are at T

A

= 25°C (Note 2). V

IN

= 3.3V, V

OUT

= 3.3V, R

T

= 100kΩ unless otherwise noted.

PARAMETER

Input Operating Range

Output Voltage Adjust Range

Undervoltage Lockout Threshold

Feedback Voltage

Feedback Pin Input Current (FB)

Quiescent Current, Burst Mode Operation

Quiescent Current, Shutdown (I

VIN

)

V

IN

Ramping Down

V

IN

Ramping Up

0°C < T

J

< 85°C (Note 5)

–40°C < T

J

< 125°C

V

FB

= 0.6V in Servo Loop, V

MODE/SYNC

= 0V

V

FB

= 0.7V, V

MODE/SYNC

= V

IN

V

SHDN

= 0V

32

0.1

CONDITIONS

l

elecTrical characTerisTics

MIN

1.8

1.6

0.594

0.591

TYP

MAX

5.5

UNITS

V

nA

µA

3536fa

1.67

1.75

0.6

1.8

0.606

0.609

50

42

1

2

LTC3536

elecTrical characTerisTics

PARAMETER

Quiescent Current, Active (I

VIN

)

Input Current Limit

Peak Current Limit

Burst Mode Peak Current Limit

Reverse Current Limit

NMOS Switch Leakage

PMOS Switch Leakage

NMOS Switch On-Resistance

PMOS Switch On-Resistance

Frequency Accuracy

Frequency Accuracy Default

Internal Soft-Start Time

Maximum Duty Cycle

Minimum Duty Cycle

Error Amplifier AVOL

Error Amplifier Sink Current

Error Amplifier Source Current

MODE/SYNC Input Logic Threshold

MODE/SYNC External Synchronization

MODE/SYNC Synchronization Frequency

MODE/SYNC Input Current

SHDN

Input Logic Threshold

SHDN

Input Current

V

SHDN

= 5.5V = V

IN

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 LTC3536 is tested under pulsed load conditions such that

T

J

≈

T

A

. The LTC3536E 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 LTC3536I 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. 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

(in °C/W) is the package thermal impedance.

V

MODE/SYNC

= 5.5V = V

IN

l

The

l

denotes the specifications which apply over the full operating junction

temperature range, otherwise specifications are at T

A

= 25°C (Note 2). V

IN

= 3.3V, V

OUT

= 3.3V, R

T

= 100kΩ unless otherwise noted.

CONDITIONS

V

FB

= 0.7V, V

MODE/SYNC

= 0V

V

MODE/SYNC

= 0V (Note 4)

V

MODE/SYNC

= 0V (Note 4)

V

MODE/SYNC

= V

IN

(Note 4)

Switch B, C: SW1 = SW2 = 5.5V, V

IN

= 5.5V, V

OUT

= 5.5V

Switch A, D: SW1 = SW2 = 0V, V

IN

= 5.5V, V

OUT

= 5.5V

Switch B (From SW1 to GND) (Note 6)

Switch C (From SW2 to GND) (Note 6)

Switch A (From V

IN

to SW1) (Note 6)

Switch D (From V

OUT

to SW2) (Note 6)

R

T

= 100k

R

T

= V

IN

V

FB

from 0.06V to 0.54V

Percentage of Period SW2 is Low in Boost Mode

Percentage of Period SW1 is High in Buck Mode

FB = 1.3V, VC = 1V

FB = 0.3V, VC = 0V

Disable Burst Mode Operation

SYNC Level High

SYNC Level Low

l

MIN

2

0.4

0.3

TYP

2.5

3.4

0.6

0.55

0.1

0.11

0.1

0.12

0.145

MAX

800

4

UNITS

µA

A

1

µA

Ω

0.8

0.96

0.6

88

1

1.2

0.9

91

1.2

1.44

1.2

0

MHz

ms

%

dB

µA

90

250

400

0.3

1.2

0.3

300

480

1

0.4

2

1

V

MHz

µA

V

µA

Note 3:

This IC includes overtemperature 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.

Note 4:

Current measurements are performed when the LTC3536 is

not switching. The current limit values measured in operation will be

somewhat higher due to the propagation delay of the comparators.

Note 5:

Guaranteed by design characterization and correlation with

statistical process controls.

Note 6:

Guaranteed by correlation and design.

3536fa

3

LTC3536

Typical perForMance characTerisTics

Efficiency 3.3V vs Load Current

100

90

80

EFFICIENCY (%)

70

60

50

40

30

20

10

0

0.001

V

IN

= 1.8V

V

IN

= 2.5V

V

IN

= 5.5V

V

IN

= 1.8V BURST

V

IN

= 2.5V BURST

V

IN

= 5.5V BURST

0.01

0.1

LOAD CURRENT (A)

1

3536 G01

T

A

= 25°C, V

IN

= V

OUT

= 3.3 V unless otherwise noted.

No-Load Quiescent Current in Burst

Mode Operation (MODE = V

IN

)

60

INPUT QUIESCENT CURRENT (µA)

55

50

45

40

35

30

25

20

1.5

2

2.5

V

OUT

= 1.8V

V

OUT

= 3.3V

V

OUT

= 5.5V

3 3.5 4 4.5 5

INPUT VOLTAGE (V)

5.5

6

Efficiency Li-Ion (3V, 3.7V, 4.2V)

to 3.3V Output

100

90

80

70

60

50

40

30

20

10

0

0.001

V

IN

= 3V

V

IN

= 3.7V

V

IN

= 4.2V

V

IN

= 3V BURST

V

IN

= 3.7V BURST

V

IN

= 4.2V BURST

0.01

0.1

LOAD CURRENT (A)

1

3536 G02

3536 G03

No-Load Quiescent Current in

PWM Mode Operation

14

INPUT QUIESCENT CURRENT (mA)

12

10

8

6

4

2

0

1.5

2

2.5

3 3.5 4 4.5 5

INPUT VOLTAGE (V)

5.5

6

V

OUT

= 3.3V

V

OUT

= 1.8V

V

OUT

= 5.5V

2.0

1.9

1.8

1.7

1.6

1.5

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

0.5

1.5

Input Current Limit vs Supply

Voltage, V

OUT

= GND

Input Current Limit vs Supply

Voltage, V

OUT

= 3.3V

3.1

3.0

2.9

2.8

2.7

2.6

2.5

2.4

2.3

2.2

2.1

2.0

1.9

1.8

1.7

1.6

1.5

INPUT CURRENT LIMIT (A)

125°C

85°C

25°C

–40°C

2

2.5

3 3.5 4 4.5 5

INPUT VOLTAGE (V)

5.5

6

INPUT CURRENT LIMIT (A)

125°C

85°C

25°C

–40°C

2

2.5

3 3.5 4 4.5 5

INPUT VOLTAGE (V)

5.5

6

3536 G04

3536 G05

3536 G06

R

DS(ON)

for P-Channel Switch A

280

260

240

220

R

DS(ON)

(m )

200

180

160

140

120

100

80

60

1.5

2

2.5

3 3.5 4 4.5 5

INPUT VOLTAGE (V)

5.5

6

–45°C

0°C

25°C

85°C

125°C

R

DS(ON)

(m )

280

260

240

220

200

180

160

140

120

100

80

60

R

DS(ON)

for N-Channel Switch B

–45°C

0°C

25°C

85°C

125°C

R

DS(ON)

(m )

280

260

240

220

200

180

160

140

120

100

80

1.5

2

2.5

3 3.5 4 4.5 5

INPUT VOLTAGE (V)

5.5

6

60

R

DS(ON)

for N-Channel Switch C

–45°C

0°C

25°C

85°C

125°C

1.5

2

2.5

3 3.5 4 4.5 5

INPUT VOLTAGE (V)

5.5

6

3536 G07

3536 G08

3536 G09

4

3536fa

LTC3536

Typical perForMance characTerisTics

R

DS(ON)

for P-Channel Switch D

280

260

240

220

R

DS(ON)

(m )

200

180

160

140

120

100

80

60

1.5

2

2.5

3 3.5 4 4.5 5

INPUT VOLTAGE (V)

5.5

6

CHANGE IN VOLTAGE FROM 25°C (%)

–45°C

0°C

25°C

85°C

125°C

1.0

0.8

0.6

0.4

0.2

0

–0.2

–0.4

–0.6

–0.8

–1.0

– 50 – 30 – 10 10 30 50 70 90 110 130 150

TEMPERATURE (°C)

3536 G11

T

A

= 25°C, V

IN

= V

OUT

= 3.3 V unless otherwise noted.

Oscillator Frequency vs R

T

2.0

1.8

OSCILLATOR FREQUENCY (MHz)

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

40

90

140

190

240

R

T

(k )

290

340

Feedback Voltage

3536 G10

3536 G12

Maximum Load Current in PWM Mode

vs Input Voltage 1MHz Switching

Frequency, 4.7µH Inductor Value

2500

MAXIMUM LOAD CURRENT (mA)

2000

MAXIMUM LOAD CURRENT (mA)

300

250

200

150

100

50

0

Maximum Load Current in Burst

Mode Operation vs Input Voltage

0

Negative Inductor Current

vs Oscillator Frequency

V

OUT

PULLED UP TO 3.6V

V

IN

= 1.8V

L = 4.7µH

REVERSE CURRENT LIMIT (A)

6

–0.5

1500

–1.0

1000

500

0

V

OUT

= 1.8V

V

OUT

= 3.3V

V

OUT

= 5.5V

2

2.5

3 3.5 4 4.5 5

INPUT VOLTAGE (V)

5.5

6

–1.5

V

OUT

= 1.8V

V

OUT

= 3.3V

V

OUT

= 5.5V

2

2.5

3 3.5 4 4.5 5

INPUT VOLTAGE (V)

5.5

1.5

–2.0

0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4

OSCILLATOR FREQUENCY (MHz)

3536 G15

3536 G13

3536 G14

Change in Output Voltage vs Load

Current for 3.3V Output and 3.3V

Input

1

OUTPUT VOLTAGE REGULATION (%)

V

OUT

200mV/DIV

0

I

LOAD

500mA/DIV

–1

Load Step 0A to 1A

V

OUT

200mV/DIV

Load Step 0mA to 300mA

I

LOAD

100mA/DIV

V

IN

= 3.2V

V

OUT

= 3.3V

100µs/DIV

3536 G17

V

IN

= 1.8V

V

OUT

= 3.3V

100µs/DIV

3536 G18

–2

PWM

BURST

0.01

0.1

1

LOAD CURRENT (mA)

10

3536 G16

–3

0.001

3536fa

5

参数名称	属性值
欧盟限制某些有害物质的使用	Compliant
ECCN (US)	EAR99
Part Status	Active
类型 Type	Synchronous Step Down\|Step Up
输出类型 Output Type	Adjustable
Switching Frequency (kHz)	300 to 2000
Switching Regulator	Yes
Number of Outputs	1
Output Voltage (V)	1.8 to 5.5
Maximum Output Current (A)	1
Minimum Input Voltage (V)	1.8
Maximum Input Voltage (V)	5.5
Typical Quiescent Current (uA)	32
Efficiency (%)	95
Minimum Operating Temperature (°C)	-40
Maximum Operating Temperature (°C)	125
Supplier Temperature Grade	Extended
系列 Packaging	Tape and Reel
Pin Count	12
Standard Package Name	SOP
Supplier Package	MSOP EP
Mounting	Surface Mount
Package Height	0.86
Package Length	4.04
Package Width	3
PCB changed	12
Lead Shape	Gull-wing

	LTC3536EMSE#TRPBF	LTC3536EDD#PBF	LTC3536EDD#TRPBF	LTC3536EMSE#PBF	LTC3536IDD#PBF	LTC3536IDD#TRPBF	LTC3536IMSE#PBF	LTC3536IMSE#TRPBF
描述	Conv DC-DC 1.8V to 5.5V Synchronous Step Down/Step Up Single-Out 1.8V to 5.5V 1A 12-Pin MSOP EP T/R	Conv DC-DC 1.8V to 5.5V Synchronous Step Down/Step Up Single-Out 1.8V to 5.5V 1A 10-Pin DFN EP Tube	Conv DC-DC 1.8V to 5.5V Synchronous Step Down/Step Up Single-Out 1.8V to 5.5V 1A 10-Pin DFN EP T/R	Conv DC-DC 1.8V to 5.5V Synchronous Step Down/Step Up Single-Out 1.8V to 5.5V 1A 12-Pin MSOP EP Tube	Conv DC-DC 1.8V to 5.5V Synchronous Step Down/Step Up Single-Out 1.8V to 5.5V 1A 10-Pin DFN EP Tube	Conv DC-DC 1.8V to 5.5V Synchronous Step Down/Step Up Single-Out 1.8V to 5.5V 1A 10-Pin DFN EP T/R	Conv DC-DC 1.8V to 5.5V Synchronous Step Down/Step Up Single-Out 1.8V to 5.5V 1A 12-Pin MSOP EP Tube	Conv DC-DC 1.8V to 5.5V Synchronous Step Down/Step Up Single-Out 1.8V to 5.5V 1A 12-Pin MSOP EP T/R
欧盟限制某些有害物质的使用	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant
ECCN (US)	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Part Status	Active	Active	Active	Active	Active	Active	Active	Active
类型 Type	Synchronous Step Down\|Step Up	Synchronous Step Down\|Step Up	Synchronous Step Down\|Step Up	Synchronous Step Down\|Step Up	Synchronous Step Down\|Step Up	Synchronous Step Down\|Step Up	Step Up\|Synchronous Step Down	Synchronous Step Down\|Step Up
输出类型 Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Switching Frequency (kHz)	300 to 2000	300 to 2000	300 to 2000	300 to 2000	300 to 2000	300 to 2000	300 to 2000	300 to 2000
Switching Regulator	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Number of Outputs	1	1	1	1	1	1	1	1
Output Voltage (V)	1.8 to 5.5	1.8 to 5.5	1.8 to 5.5	1.8 to 5.5	1.8 to 5.5	1.8 to 5.5	1.8 to 5.5	1.8 to 5.5
Maximum Output Current (A)	1	1	1	1	1	1	1	1
Minimum Input Voltage (V)	1.8	1.8	1.8	1.8	1.8	1.8	1.8	1.8
Maximum Input Voltage (V)	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5
Typical Quiescent Current (uA)	32	32	32	32	32	32	32	32
Efficiency (%)	95	95	95	95	95	95	95	95
Minimum Operating Temperature (°C)	-40	-40	-40	-40	-40	-40	-40	-40
Maximum Operating Temperature (°C)	125	125	125	125	125	125	125	125
Supplier Temperature Grade	Extended	Extended	Extended	Extended	Industrial	Industrial	Industrial	Industrial
系列 Packaging	Tape and Reel	Tube	Tape and Reel	Tube	Tube	Tape and Reel	Tube	Tape and Reel
Pin Count	12	10	10	12	10	10	12	12
Standard Package Name	SOP	DFN	DFN	SOP	DFN	DFN	SOP	SOP
Supplier Package	MSOP EP	DFN EP	DFN EP	MSOP EP	DFN EP	DFN EP	MSOP EP	MSOP EP
Mounting	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package Height	0.86	0.75(Max)	0.75(Max)	0.86	0.75(Max)	0.75(Max)	0.86	0.86
Package Length	4.04	3	3	4.04	3	3	4.04	4.04
Package Width	3	3	3	3	3	3	3	3
PCB changed	12	10	10	12	10	10	12	12
Lead Shape	Gull-wing	No Lead	No Lead	Gull-wing	No Lead	No Lead	Gull-wing	Gull-wing
HTS	-	8542.39.00.01	8542.39.00.01	8542.39.00.01	8542.39.00.01	-	8542.39.00.01	-

LTC3536EMSE#TRPBF

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