LP8553

SNVS701B – SEPTEMBER 2011 – REVISED JANUARY 2014

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Electrical Characteristics

(1) (2)

(

10

(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

3.0

5 MHz PLL Clock

Normal Mode Supply Current

mA

10 MHz PLL Clock

3.7

20 MHz PLL Clock

4.7

40 MHz PLL Clock

6.7

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

3.0V

180

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 = 0

1.4

SW Pin Current Limit

A

BOOST_IMAX = 1

2.5

(1)

LED Driver Electrical Characteristics

Symbol

Parameter

Condition

Min

Typ

Max

Units

Leakage Current

0.1

1

μA

EN_I_RES = 0, CURRENT[7:0] = FFh

30

Maximum Source Current

mA

OUT1...OUT4

EN_I_RES = 1, CURRENT[7:0] = FFh

50

Output Current Accuracy

−3

+3

Output current set to 23 mA, EN_I_RES = 1

%

(1)

−4

+4

Output current set to 23 mA, EN_I_RES = 1

0.5

%

(1)

Output Current Accuracy is the difference between the actual value of the output current and programmed value of this current.

Matching is the maximum difference from the average. For the constant current sinks on the part (OUT1 to OUT4), the following are

determined: the maximum output current (MAX), the minimum output current (MIN), and the average output current of all outputs (AVG).

Two matching numbers are calculated: (MAX-AVG)/AVG and (AVG-MIN/AVG). The largest number of the two (worst case) is

considered the matching figure. The typical specification provided is the most likely norm of the matching figure for all parts. Note that

some manufacturers have different definitions in use.

6

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