LP8556 datasheet(7/52 Pages) TI

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LP8556

www.ti.com

SNVS871B – JULY 2012 – REVISED SEPTEMBER 2012

Electrical Characteristics

(1) (2)

Limits in standard typeface are for TA = 25 °C. Limits in boldface type apply over the full operating ambient temperature

range (-30 °C

≤ TA ≤ +85 °C). Unless otherwise specified: VDD=12V, EN / VDDIO = 1.8V

Symbol

Parameter

Condition

Min

Typ

Max

Units

VDDIO

Supply voltage for digital I/Os

1.62

3.6

VDD

Input voltage for the internal LDO

2.7

Standby Supply Current

EN / VDDIO=0V, LDO disabled

1.6

μA

IDD

LDO enabled, Boost disabled

0.9

1.5

Normal Mode Supply Current

LDO enabled, Boost enabled, no load

2.2

3.65

Internal Oscillator Frequency

-4

fOSC

Accuracy

-7

VDD ≥ 3.1V

2.95

3.05

3.15

VLDO

LDO Output Voltage

2.7V

≤ VDD < 3.1V

VDD -

0.05

TTSD

Thermal Shutdown Threshold

See(3)

150

°C

TTSD_hyst

Thermal Shutdown Hysteresis

°C

(1)

All voltages are with respect to the potential at the GND pins.

(2)

Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the

most likely norm.

(3)

Guaranteed by design and not tested in production.

Boost Converter Electrical Characteristics

(1)

Symbol

Parameter

Condition

Min

Typ

Max

Units

RDS_ON

Switch ON resistance

ISW = 0.5A

0.19

Ω

Boost minimum output

VBOOST_RANGE = 0

VBOOST_MIN

voltage

VBOOST_RANGE = 1

VBOOST_MAX = 100, VBOOST_RANGE = 0

19.0

VBOOST_MAX = 101, VBOOST_RANGE = 0

24.0

VBOOST_MAX = 110, VBOOST_RANGE = 0

28.0

VBOOST_MAX = 111, VBOOST_RANGE = 0

Boost maximum output

VBOOST_MAX = 010, VBOOST_RANGE = 1

17.9

23.1

VBOOST_MAX

voltage

VBOOST_MAX = 011, VBOOST_RANGE = 1

22.8

27.2

VBOOST_MAX = 100, VBOOST_RANGE = 1

27.8

31.5

VBOOST_MAX = 101, VBOOST_RANGE = 1

32.7

34.5

36.6

VBOOST_MAX = 110, VBOOST_RANGE = 1

37.2

40.8

VBOOST_MAX = 111, VBOOST_RANGE = 1

41.8

44.2

VIN = 3V, VOUT = 18V

220

Maximum continuous output

ILOAD_MAX

VIN = 3V, VOUT = 24V

160

load current

VIN = 3V, VOUT = 30V

120

fSW = 625 kHz

VOUT/VIN

Conversion ratio(2)

fSW = 1250 kHz

BOOST_FREQ = 00

312

fSW

Switching frequency

BOOST_FREQ = 01

625

kHz

BOOST_FREQ = 10

1250

Over-voltage protection

VBOOST

VOVP

VBOOST_RANGE = 1

voltage

+ 1.6V

UVLO_EN=1

VIN under-voltage lockout

VUVLO

UVLO_TH = 0, falling

2.5

threshold

UVLO_TH = 1, falling

5.2

VUVLO[rising]

UVLO_TH = 0

VUVLO_hyst

VUVLO hysteresis

VUVLO[falling]

UVLO_TH = 1

100

tPULSE

Switch minimum pulse width

no load

(1)

Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the

most likely norm.

(2)

Guaranteed by design and not tested in production.

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