LP8556 datasheet(8/63 Pages) TI1

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LP8556

SNVS871I – JULY 2012 – REVISED MARCH 2016

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Product Folder Links: LP8556

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(1)

Minimum (MIN) and Maximum (MAX) limits are verified by design, test, or statistical analysis. Typical numbers are for information only.

(2)

Verified by design and not tested in production.

(3)

Start-up time is measured from the moment boost is activated until the VBOOST crosses 90% of its target value.

(4)

1.8 A is the maximum ISW_LIM supported with the DSBGA package. For applications requiring the ISW_LIM to be greater than 1.8 A and

up to 2.6 A, WQFN package should be considered.

7.6 Electrical Characteristics — Boost Converter

over operating free-air temperature range (unless otherwise noted)

(1)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

RDS_ON

Switch ON resistance

ISW = 0.5A

0.19

Ω

VBOOST_MIN

Boost minimum output

voltage

VBOOST_RANGE = 0

VBOOST_RANGE = 1

VBOOST_MAX

Boost maximum output

voltage

VBOOST_MAX = 100, VBOOST_RANGE = 0

VBOOST_MAX = 101, VBOOST_RANGE = 0

VBOOST_MAX = 110, VBOOST_RANGE = 0

VBOOST_MAX = 111, VBOOST_RANGE = 0

24.0

28.0

VBOOST_MAX = 010, VBOOST_RANGE = 1

VBOOST_MAX = 011, VBOOST_RANGE = 1

VBOOST_MAX = 100, VBOOST_RANGE = 1

VBOOST_MAX = 101, VBOOST_RANGE = 1

VBOOST_MAX = 110, VBOOST_RANGE = 1

VBOOST_MAX = 111, VBOOST_RANGE = 1

17.9

22.8

27.8

32.7

37.2

41.8

34.5

23.1

27.2

31.5

36.6

40.8

44.2

ILOAD_MAX

Maximum continuous output

load current

VIN = 3 V, VOUT = 18 V

220

VIN = 3 V, VOUT = 24 V

160

VIN = 3 V, VOUT = 30 V

120

VOUT/VIN

Conversion ratio(2)

fSW = 625 kHz

fSW = 1250 kHz

fSW

Switching frequency

BOOST_FREQ = 00

BOOST_FREQ = 01

BOOST_FREQ = 10

312

625

1250

kHz

VOVP

Overvoltage protection

voltage

VBOOST_RANGE = 1

VBOOST + 1.6

VUVLO

VIN undervoltage lockout

threshold

UVLO_EN = 1

UVLO_TH = 0, falling

UVLO_TH = 1, falling

2.5

5.2

VUVLO_hyst

VUVLO hysteresis

VUVLO[rising]

VUVLO[falling]

UVLO_TH = 0

UVLO_TH = 1

100

tPULSE

Switch minimum pulse width

No load

tSTARTUP

Start-up time

See(3)

ISW_LIM

SW pin current limit(4)

IBOOST_LIM_2X = 0

IBOOST_LIM = 00

IBOOST_LIM = 01

IBOOST_LIM = 10

IBOOST_LIM = 11

0.66

0.88

1.12

1.35

0.9

1.2

1.5

1.8

1.16

1.40

1.73

2.07

IBOOST_LIM_2X = 1

IBOOST_LIM = 00

IBOOST_LIM = 01

IBOOST_LIM = 10

1.6

2.1

2.6

ΔVSW /

toff_on

SW pin slew rate during OFF

to ON transition

EN_DRV3 = 0 AND EN_DRV2 = 0

EN_DRV3 = 0 AND EN_DRV2 = 1

EN_DRV3 = 1 AND EN_DRV2 = 1

3.7

5.3

7.5

V/ns

ΔVSW /

ton_off

SW pin slew rate during ON

to OFF transition

EN_DRV3 = 0 AND EN_DRV2 = 0

EN_DRV3 = 0 AND EN_DRV2 = 1

EN_DRV3 = 1 AND EN_DRV2 = 1

1.9

4.4

4.8

V/ns

ΔtON / tSW

Peak-to-peak switch ON

time deviation to SW period

ratio (spread spectrum

feature)

SSCLK_EN = 1

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