LTC3556 datasheet(9/50 Pages) LINER

Part #	LTC3556

Description	8-Output Regulator with Sequencing and I2C

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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9 / 50 page

LTC3589/LTC3589-1/

LTC3589-2

9

3589fe

TYPICAL PERFORMANCE CHARACTERISTICS

Standby IVIN vs VIN

LDO2 to LDO4 IVIN vs VIN

VIN = 3.8V, TA = 25°C, unless otherwise noted.

Step-Down Switching Regulator

IVIN vs VIN

Input Supply Current

vs Temperature

Buck-Boost IVIN vs VIN

Step-Down Switching Regulator

IVIN vs VIN

VIN (V)

2.5

14

4.0

22554 G01

8

4

3.0

3.5

4.5

2

0

12

10

6

5.0

5.5

VIN (V)

2.5

4.0

3589 G02

150

50

3.0

3.5

4.5

0

250

200

100

5.0

5.5

ENABLE TWO LDOs

ENABLE ONE LDO

ENABLE THREE LDOs

VIN (V)

2.5

4.0

3589 G03

400

500

600

200

100

3.0

3.5

4.5

0

900

800

700

300

5.0

5.5

ENABLE TWO BUCKS

ENABLE ONE BUCK

ENABLE THREE BUCKS

PULSE-SKIPPING MODE

VIN (V)

2.5

4.0

3589 G04

80

100

120

40

20

3.0

3.5

4.5

0

60

5.0

5.5

ENABLE TWO BUCKS

ENABLE ONE BUCK

ENABLE THREE BUCKS

Burst Mode OPERATION

TEMPERATURE (°C)

–50

50

25

3589 G05

800

1000

1200

400

200

–25

0

75

0

600

100 125

150

ALL REGULATORS ENABLED

Burst Mode OPERATION

STANDBY (ONLY LDO1 ON)

ALL REGULATORS ENABLED

PULSE-SKIPPING MODE

VIN (V)

2.5

4.5

4.0

3589 G06

350

400

450

150

200

50

100

3.0

3.5

5.0

0

300

250

5.5

Burst Mode OPERATION

PWM MODE

Oscillator Frequency

vs Temperature

Switching Frequency Change vs VIN

Buck-Boost Efficiency vs IOUT

TEMPERATURE (°C)

–50

70

3589 G07

2.20

2.25

2.30

2.10

2.15

2.00

2.05

–10

30

110

1.95

150

VIN (V)

2.5

4.0

3589 G08

0.6

0.8

1.0

–0.2

0

0.2

0.4

–0.6

–0.4

3.0

3.5

4.5

–0.8

5.5

5.0

LOAD CURRENT (mA)

0

50

40

30

60

70

100

0.01

0.1

1

10

100

1000

3589 G9

20

10

80

90

BURST

PWM MODE

VOUT = 5.0V

VOUT = 2.5V

VOUT = 3.3V

VIN = 3.8V

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