LT8410_15 datasheet, PDF - EEWORLD Datasheet

FEATURES

n

LT8410/LT8410-1

Ultralow Power Boost

Converter with Output

Disconnect

DESCRIPTION

The LT

®

8410/LT8410-1 are ultralow power boost converters

with integrated power switch, Schottky diode and output

disconnect circuitry. The parts control power delivery by

varying both the peak inductor current and switch off-

time. This control scheme results in low output voltage

ripple as well as high efficiency over a wide load range.

The quiescent current is a low 8.5μA, which is further

reduced to 0μA in shutdown. The internal disconnect

circuitry allows the output voltage to be blocked from the

input during shutdown. High value (12.4M/0.4M) resis-

tors are integrated on chip for output voltage detection,

significantly reducing input referred quiescent current. The

LT8410/ LT8410-1 also features a comparator built into the

SHDN

pin, overvoltage protection for the CAP and V

OUT

pins, built in soft-start and comes in a tiny 8-pin 2mm

×

2mm DFN package.

L,

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

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

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

5481178, 6580258, 6304066, 6127815, 6498466, 6611131.

n

Ultralow Quiescent Current

8.5μA in Active Mode

0μA in Shutdown Mode

Comparator Built into

SHDN

Low Noise Control Scheme

Adjustable FB Reference Voltage

Wide Input Range: 2.5V to 16V

Wide Output Range: Up to 40V

Integrated Power NPN Switch

25mA Current Limit (LT8410)

8mA Current Limit (LT8410-1)

Integrated Schottky Diode

Integrated Output Disconnect

High Value (12.4M/0.4M) Feedback Resistors

Integrated

Built in Soft-Start (Optional Capacitor from V

REF

to GND)

Overvoltage Protection for CAP and V

OUT

Pins

Tiny 8-Pin 2mm

×

2mm DFN Package

APPLICATIONS

n

Sensor Power

RF Mems Relay Power

General Purpose Bias

TYPICAL APPLICATION

General Purpose Bias with Wide Input Voltage

V

IN

2.5V to 16V

2.2µF

SW

V

CC

CHIP

ENABLE

CAP

V

OUT

10

100µH

V

OUT

PEAK-TO-PEAK RIPPLE (mV)

0.1µF

V

OUT

= 16V

0.1µF*

604k

GND

FBP

412k

8410-1 TA01a

Output Voltage Ripple

vs Load Current

100

V

IN

= 3.6V

8

EFFICIENCY (%)

90

80

Efficiency vs Load Current

V

IN

= 12V

V

IN

= 5V

V

IN

= 3.6V

70

60

50

40

0.01

LT8410

V

REF

SHDN

6

4

0.1µF

2

*HIGHER VALUE CAPACITOR IS REQUIRED

WHEN THE V

IN

IS HIGHER THAN 5V

0

0.01

0.1

1

LOAD CURRENT (mA)

10

8410-1 TA02

0.1

1

10

LOAD CURRENT (mA)

100

8410-1 TA03

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1

LT8410/LT8410-1

ABSOLUTE MAXIMUM RATINGS

(Note 1)

PIN CONFIGURATION

TOP VIEW

SHDN

1

V

CC

2

GND 3

SW 4

9

8 FBP

7 V

REF

6 CAP

5 V

OUT

V

CC

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

SW Voltage ................................................ –0.3V to 40V

CAP Voltage ............................................... –0.3V to 40V

V

OUT

Voltage .............................................. –0.3V to 40V

SHDN

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

V

REF

Voltage.............................................. –0.3V to 2.5V

FBP Voltage .............................................. –0.3V to 2.5V

Maximum Junction Temperature .......................... 125°C

Operating Temperature Range (Note 2)..–40°C to 125°C

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

DC PACKAGE

8-LEAD (2mm

×

2mm) PLASTIC DFN

T

JMAX

= 125°C,

θ

JA

= 88°C/W

EXPOSED PAD (PIN #9) IS GND, MUST BE SOLDERED TO PCB

ORDER INFORMATION

LEAD FREE FINISH

LT8410EDC#PBF

LT8410IDC#PBF

LT8410EDC-1#PBF

LT8410IDC-1#PBF

TAPE AND REEL

LT8410EDC#TRPBF

LT8410IDC#TRPBF

LT8410EDC-1#TRPBF

LT8410IDC-1#TRPBF

PART MARKING*

LDQR

LFCC

PACKAGE DESCRIPTION

8-Lead (2mm

×

2mm) Plastic DFN

8-Lead (2mm

×

2mm) Plastic DFN

8-Lead (2mm

×

2mm) Plastic DFN

8-Lead (2mm

×

2mm) Plastic DFN

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

temperature range, otherwise specifications are at T

A

= 25°C. V

CC

= 3V, V

SHDN

= V

CC

unless otherwise noted. (Note 2)

PARAMETER

Minimum Operating Voltage

Maximum Operating Voltage

Reference Voltage

V

REF

Current Limit

V

REF

Discharge Time

V

REF

Line Regulation

Quiescent Current

Quiescent Current in Shutdown

Quiescent Current from V

OUT

and CAP

Minimum Switch Off Time

Switch Current Limit

Not Switching

V

SHDN

= 0V

V

OUT

= 16V

After Start-Up (Note 4)

During Start-Up (Note 4)

LT8410

LT8410-1

l

ELECTRICAL CHARACTERISTICS

CONDITIONS

MIN

TYP

2.2

MAX

2.5

16

1.255

UNITS

V

µA

µS

%/V

1.220

1.235

10

70

0.01

8.5

0

3

240

600

(Note 3)

12

1

µA

nS

20

6

25

8

30

10

mA

84101fb

2

LT8410/LT8410-1

The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. V

CC

= 3V, V

SHDN

= V

CC

unless otherwise noted. (Note 2)

PARAMETER

Switch V

CESAT

Switch Leakage Current

Schottky Forward Voltage

Schottky Reverse Leakage

PMOS Disconnect Current Limit

PMOS Disconnect V

CAP

– V

OUT

V

OUT

Resistor Divider Ratio

FBP Pin Bias Current

SHDN

Minimum Input Voltage High

SHDN

Input Voltage High Hysteresis

SHDN

Hysteresis Current

SHDN

Input Voltage Low

SHDN

Pin Bias Current

V

SHDN

= 3V

V

SHDN

= 16V

0

2

V

FBP

= 0.5V, Current Flows Out of Pin

SHDN

Rising

CONDITIONS

LT8410, I

SW

= 10mA

LT8410-1, I

SW

= 4mA

V

SW

= 5V

I

DIODE

= 10mA

V

CAP

– V

SW

= 5

V

CAP

– V

SW

= 40

LT8410

LT8410-1

I

OUT

= 1mA

l

ELECTRICAL CHARACTERISTICS

MIN

TYP

150

100

0

650

0

MAX

UNITS

mV

1

850

0.5

1

25

5

32.2

30

1.45

0.14

0.3

1

3

µA

mV

µA

mA

mV

nA

V

mV

µA

V

µA

14

2.5

31.6

1.20

0.08

19

4

50

31.85

1.3

1.30

60

0.1

(Note 3)

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 LT8410E/LT8410E-1 are guaranteed to meet performance

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 LT8410I/LT8410I-1 are guaranteed over the full –40°C to 125°C

operating junction temperature range.

Note 3:

See the Applications Information section for more information.

Note 4:

Start-up mode occurs when V

OUT

is less than V

FBP

• 64/3.

TYPICAL PERFORMANCE CHARACTERISTICS

Switching Frequency

vs Load Current

1000

OUTPUT VOLTAGE CHANGE (%)

V

CC

= 3.6V

V

OUT

= 16V

FIGURE 4 CIRCUIT

0.6

0.4

0.2

0

– 0.2

– 0.4

– 0.6

T

A

= 25°C, unless otherwise noted.

Load Regulation

50

V

CC

= 3.6V

V

OUT

= 16V

FIGURE 4 CIRCUIT

OUTPUT VOLTAGE (V)

V

OUT

vs FBP Voltage

SWITCHING FREQUENCY (kHz)

800

40

600

30

400

20

200

10

0

1

2

LOAD CURRENT (mA)

3

8410-1 G01

0

1

2

LOAD CURRENT (mA)

3

8410-1 G02

0

0.5

1

1.5

FBP VOLTAGE (V)

2

8410-1 G03

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3

LT8410/LT8410-1

TYPICAL PERFORMANCE CHARACTERISTICS

Output Voltage vs Temperature

1.00

0.75

OUTPUT VOLTAGE CHANGE (%)

0.50

0.25

0

–0.25

–0.50

–0.75

–1.00

– 40

0

40

80

TEMPERATURE (°C)

120

8410-1 G04

Quiescent Current—Not Switching

12

10

QUIESCENT CURRENT (µA)

8

6

4

2

0

QUIESCENT CURRENT (µA)

10

Quiescent Current vs Temperature

V

CC

= 3.6V, V

OUT

= 16V

LOAD = 0.5mA

FIGURE 4 CIRCUIT

8

6

4

2

V

CC

= 3.6V

0

4

8

12

V

CC

VOLTAGE (V)

16

8410-1 G05

0

–40

0

40

80

TEMPERATURE (°C)

120

8410-1 G06

Quiescent Current

vs

SHDN

Voltage

10

1000

Quiescent Current in Regulation

with No Load

V

CC

= 3.6V

SHDN

PIN BIAS CURRENT (µA)

2.5

2.0

1.5

1.0

0.5

0

–0.5

SHDN

Current vs

SHDN

Voltage

V

CC

= 3.6V

QUIESCENT CURRENT (µA)

6

QUIESCENT CURRENT (µA)

V

CC

= 3.6V

0

8

100

4

2

0

1

2

3

SHDN

VOLTAGE (V)

4

5

8410-1 G07

10

0

10

20

30

OUTPUT VOLTAGE (V)

40

8410-1 G08

0

4

8

12

SHDN

VOLTAGE (V)

16

8410-1 G09

Peak Inductor Current

vs Temperature (LT8410)

40

PEAK INDUCTOR CURRENT (mA)

V

CC

= 3.6V

V

OUT

= 16V

FIGURE 4 CIRCUIT

15

PEAK INDUCTOR CURRENT (mA)

Peak Inductor Current

vs Temperature (LT8410-1)

1.235

V

CC

= 3.6V

V

OUT

= 16V

FIGURE 5 CIRCUIT

V

REF

Voltage vs Temperature

36

13

1.234

V

REF

VOLTAGE (V)

32

11

1.233

28

9

1.232

24

7

1.231

V

CC

= 3.6V

20

–40

0

40

80

TEMPERATURE (°C)

120

8410-1 G10

5

– 40

0

40

80

TEMPERATURE (°C)

120

8410-1 G11

1.230

–40

0

40

80

TEMPERATURE (°C)

120

8410-1 G12

84101fb

4

LT8410/LT8410-1

TYPICAL PERFORMANCE CHARACTERISTICS

LT8410 Switching Waveform

at No Load

V

OUT

VOLTAGE

2mV/DIV

AC COUPLED

SW VOLTAGE

10V/DIV

INDUCTOR

CURRENT

10mA/DIV

V

CC

= 3.6V

V

OUT

= 16V

50µs/DIV

8410-1 G13

LT8410 Switching Waveform

at 0.5mA Load

V

OUT

VOLTAGE

10mV/DIV

AC COUPLED

SW VOLTAGE

10V/DIV

INDUCTOR

CURRENT

20mA/DIV

V

CC

= 3.6V

V

OUT

= 16V

2µs/DIV

8410-1 G14

LT8410 Switching Waveform

at 3mA Load

2.6

V

OUT

VOLTAGE

10mV/DIV

AC COUPLED

UVLO VOLTAGE (V)

SW VOLTAGE

10V/DIV

INDUCTOR

CURRENT

20mA/DIV

V

CC

= 3.6V

V

OUT

= 16V

500ns/DIV

8410-1 G15

UVLO vs Temperature

2.4

2.2

V

CC

FALLING

2.0

1.8

1.6

1.4

–40

V

CC

RISING

0

40

80

TEMPERATURE (°C)

120

8410-1 G16

Line Regulation

0.30

OUTPUT VOLTAGE CHANGE (%)

0.25

SHDN

MINIMUM INPUT

VOLTAGE HIGH (V)

0.20

0.15

0.10

0.05

0

V

OUT

= 16V

1.5

SHDN

Minimum Input Voltage

High vs Temperature

1.4

SHDN

RISING

1.3

SHDN

FALLING

1.2

1.1

0

4

8

12

V

CC

VOLTAGE (V)

16

8410-1 G17

1.0

–40

0

40

80

TEMPERATURE (°C)

120

8410-1 G18

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LT8410_15

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