LP5523 datasheet(5/56 Pages) TI1

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LP5523

www.ti.com

SNVS550D – SEPTEMBER 2009 – REVISED MAY 2013

LED Driver Electrical Characteristics

(1) (2) (3)

Symbol

Parameter

Condition

Min

Typ

Max

Units

Leakage Current (outputs D1

ILEAKAGE

PWM = 0%

0.1

µA

to D9)

IMAX

Maximum Source Current

Outputs D1 to D9

25.5

−4

IOUT

Output Current Accuracy (4)

Output current set to 17.5 mA

−5

IMATCH

Matching (4)

Output current set to 17.5 mA

2.5

fLED

LED Switching Frequency

312

VSAT

Saturation Voltage (5)

Output current set to 17.5 mA

100

(1)

The Electrical characteristics tables list ensured specifications under the listed Recommended Conditions except as otherwise modified

or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and are not ensured.

(2)

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

(3)

Min and Max limits are ensured by design, test, or statistical analysis.

(4)

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 outputs on the part (D1 to D9), 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. Note that some manufacturers have different definitions in use.

(5)

Saturation voltage is defined as the voltage when the LED current has dropped 10% from the value measured at VOUT – 1V.

LED Test Electrical Characteristics

(1) (2) (3)

Symbol

Parameter

Condition

Min

Typ

Max

Units

LSB

Least Significant Bit

EABS

Total Unadjusted Error (4)

VIN_TEST = 0V to VDD

<±3

±4

LSB

tCONV

Conversion Time

2.7

VIN_TEST

DC Voltage Range

(1)

The Electrical characteristics tables list ensured specifications under the listed Recommended Conditions except as otherwise modified

or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and are not ensured.

(2)

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

(3)

Min and Max limits are ensured by design, test, or statistical analysis.

(4)

Total unadjusted error includes offset, full-scale, and linearity errors.

Logic Interface Characteristics

(1) (2) (3)

Symbol

Parameter

Condition

Min

Typ

Max

Units

Logic input EN

VIL

Input Low Level

0.5

VIH

Input High Level

1.2

Input Current

−1.0

1.0

µA

tDELAY

Input Delay (4)

µs

Logic input SCL, SDA, TRIG, CLK, ASEL0, ASEL1

VIL

Input Low Level

0.2xVEN

VIH

Input High Level

0.8xVEN

Input Current

−1.0

1.0

µA

Logic output SDA, TRIG, INT

VOL

Output Low Level

IOUT = 3 mA (pullup current)

0.3

0.5

Output Leakage Current

VOUT = 2.8V

1.0

µA

Logic output GPO

VOL

Output Low Level

IOUT = 3 mA

0.3

0.5

VDD

VOH

Output High Level

IOUT = −2 mA

VDD −0.5

−0.3

(1)

The Electrical characteristics tables list ensured specifications under the listed Recommended Conditions except as otherwise modified

or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and are not ensured.

(2)

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

(3)

Min and Max limits are ensured by design, test, or statistical analysis.

(4)

The I2C host should allow at least 500 µs before sending data to the LP5523 after the rising edge of the enable line.

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