LP8545

SNVS635D – APRIL 2010 – REVISED DECEMBER 2013

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ELECTRICAL CHARACTERISTICS

(1) (2)

(-30°C

16 k

Ω.

(3)

Symbol

Parameter

Condition

Min

Typ

Max

Units

Standby Supply Current

Internal LDO disabled

1

μA

EN=L and PWM=L

LDO enabled, boost enabled, no current

going through LED outputs, Internal FET

4.0

used

5 MHz PLL Clock

Normal Mode Supply Current

mA

10 MHz PLL Clock

4.8

20 MHz PLL Clock

6.0

40 MHz PLL Clock

8.4

Internal Oscillator Frequency

-4

+4

%

Accuracy

-7

+7

Internal LDO Voltage

4.5

5.0

5.5

V

Internal LDO External Loading

5.0

mA

(1)

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

(2)

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

norm.

(3)

Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics.

BOOST CONVERTER ELECTRICAL CHARACTERISTICS

Symbol

Parameter

Condition

Min

Typ

Max

Units

Switch ON Resistance

0.12

Ω

Boost Maximum Output Voltage

40

V

9.0V

450

Maximum Continuous Load

6.0V

300

mA

Current, Internal FET

3.0V

180

9.0V

320

Maximum Continuous Load

mA

Current, External FET

6.0V

190

Conversion Ratio

10

BOOST_FREQ = 00

156

BOOST_FREQ = 01

312

Switching Frequency

kHz

BOOST_FREQ = 10

625

BOOST_FREQ = 11

1250

Over-voltage Protection Voltage

V

Switch Pulse Minimum Width

no load

50

ns

Startup Time

(1)

6

ms

BOOST_IMAX[1:0] = 00

0.9

BOOST_IMAX[1:0] = 01

1.4

SW Pin Current Limit

A

BOOST_IMAX[1:0] = 10

2.0

BOOST_IMAX[1:0] = 11

2.5

Gate Driver Pin Voltage

EN_EXT_FET = 1

0

VLDO

V

(1)

6

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