LT8705_15 datasheet(8/44 Pages) LINER

Part #	LT8705

Description	80V VIN and VOUT Synchronous 4-Switch Buck- Boost DC/DC Controller

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LT8705

8

8705fe

For more information www.linear.com/LT8705

Typical perForMance characTerisTics

IMONOutputCurrents

CLKOUT Duty Cycle

LDO33 Pin Regulation

(ILDO33 = 1mA)

SHDN and SWEN Pin Thresholds

vs Temperature

INTVCCLineRegulation

(EXTVCC=0V)

INTVCCLineRegulation

(VIN=12V)

Maximum VC vs SS

Minimum Inductor Current Sense

Voltage in Forced Continuous Mode

VIN Supply Current vs Voltage

(Not Switching)

M2 OR M3 DUTY CYCLE (%)

0

–40

–20

0

80

8705 G10

–60

–80

20

40

60

100

–100

–120

–140

BUCK REGION

BOOST REGION

VIN (V)

4

4.0

4.5

5.0

5.5

6.0

8

12

16

20

8705 G11

6.5

7.0

6

10

14

18

EXTVCC (V)

4

5.5

6.0

6.5

7.0

6

8

8705 G12

10

12

EXTVCC RISING

EXTVCC FALLING

SS (V)

0

0.2

0.6

0.8

1.0

2.0

1.4

0.4

0.8

1.0

1.2

8705 G13

0.4

1.6

1.8

1.2

0.2

0.6

1.4

BOOST AND

BUCK-BOOST REGIONS

BUCK

REGION

TJ = 25°C

VIN (V)

5

2.0

2.5

3.0

65

75

35

45

55

8705 G14

1.5

1.0

15

25

0.5

0

3.5

GATEVCC CONNECTED TO INTVCC

125°C

25°C

–40°C

CSPIN-CSNIN (mV)

CSPOUT-CSNOUT (mV)

–100

–25

0

50

75

100

200

8705 G15

25

0

–50

150

50

200

125

150

175

TEMPERATURE (°C)

–50

60

80

100

25

75

150

8705 G16

40

20

0

–25

0

50

100 125

INTVCC (V)

2.5

3.0

6

8705 G17

2.0

1.5

3

4

3.5

4.5

5

5.5

3.5

125°C

25°C

–40°C

TEMPERATURE (°C)

–55

1.22

1.26

1.30

125

8705 G18

1.18

1.14

1.20

1.24

1.28

1.16

1.12

1.10

–15

25

65 85

–35

145

5

45

105

RISING

FALLING

SHDN

SWEN

TA = 25°C unless otherwise specified.

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LT8705 Datasheet(PDF) 8 Page - Linear Technology

LT8705 Datasheet(HTML) 8 Page - Linear Technology

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