LM4970 datasheet(4/15 Pages) NSC

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Color LED Driver Electrical Characteristics V

DD = 3.0V (Notes 1, 2, 9) (Continued)

The following specifications apply for V

DD = 3.0V unless otherwise specified. Limits apply for TA = 25˚C.

Symbol

Parameter

Conditions

LM4970

Units

(Limits)

Typical

(Note 6)

Limits

(Notes 7, 8)

PWM

PWM Frequency

PWM_F<1:0> = ’01’

Input Signal Level Gain Control

Maximum setting

Minimum setting

–11

Note 1: All voltages are measured with respect to the GND pin unless otherwise specified.

Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

functional but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which

guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit

is given, however, the typical value is a good indication of device performance.

Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature, TA. The maximum

allowable power dissipation is PDMAX =(TJMAX -TA)/ θJA or the number given in Absolute Maximum Ratings, whichever is lower.

Note 4: Human body model, 100pF discharged through a 1.5k

Ω resistor.

Note 5: Machine Model, 200pF–220pF discharged through all pins, except pins 13 and 14.

Note 6: Typicals are measured at +25˚C and represent the parametric norm.

Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 8: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.

Note 9: Shutdown current and supply current are measured in a normal room environment. All digital input pins are connected to I2CVDD.

Note 10: The given

θJA is for an LM4970SD mounted on a PCB with a 2in2 area of 1oz printed circuit board copper ground plane.

Note 11: Audio input level set at 1VRMS. The input summing amplifier gain is set to 12dB.

Note 12: Machine Model, 200pF–220pF discharge through pins 13 and 14 (LED1 and LED2).

Note 13: VDD may be used to power the LEDs. It may be necessary to drive the LEDs from a boost (VDDBOOST) found within the system.

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