SNVA757D August   2017  – September 2020 LP8860-Q1

 

  1. 1LP8860-Q1 Version Summary
  2. 2Specific EEPROM Versions
    1. 2.1  A Version
    2. 2.2  B Version
    3. 2.3  C Version
    4. 2.4  D Version
    5. 2.5  E Version
    6. 2.6  F Version
    7. 2.7  G Version
    8. 2.8  H Version
    9. 2.9  J Version
    10. 2.10 L Version
    11. 2.11 N Version
    12. 2.12 R Version
  3. 3Revision History

2.9 J Version

The LP8860J-Q1 is configured for three strings × 80 mA using a 3.3-V VDD and I2C or SPI to control brightness. LED current can be adjusted using an ISET resistor. Table 2-17 lists detailed configurations and full EEPROM information for LP8860J-Q1.

Table 2-17 Detailed EEPROM Configuration: LP8860J-Q1
J
BoostSwitching Current Limit6 A
SYNC InputDisabled
2 × Charge PumpEnabled
Spread SpectrumEnabled
ƒSW2.2 MHz
VDD3.3 V
Initial Boost Voltage28 V
LED DriverInput Brightness Control MethodI2C/SPI BRT Register
Max LED current per channel80 mA
ISET Resistor ControlEnabled
Number of Channels3 strings
Channel Phase Shift120 degrees (3 phases)
LED Output Dimming MethodPWM
Current to PWM Switch PointN/A
Current Linearity Correction SlopeN/A
Output PWM Dimming Frequency9.766 kHz
Dimming Resolution10-bit PWM + 4-bit dither
Drive Strength and Rise Time200 ns
Dimming Ratio1024:1
Sloper105 ms + advanced slope
Driver Headroom VoltageVSAT + 50 mV
Fault HandlingShort LED Fault Threshold6.9 V
VIN OVP Level22.5
VIN UVLO Level5 V
VDD UVLO3 V
Input OCP Limit6 A
Powerline FET TypePMOS
SD Pulldown Current440 µA
Temperature CompensationInternal Temperature CompensationDisabled
External Temperature CompensationEnabled current dimming mode
Current Dimming Knee Point6 µA
EXT_TEMP_GAIN[3:0]14
EXT_TEMP_LEVEL_HIGH[3:0]8.49 kΩ
EXT_TEMP_LEVEL_LOW[3:0]N/A
VSYNC and PLLPLLDisabled 5-MHz oscillator
VSYNC inputDisabled
SYNC or HSYNCN/A
PWM_SYNCN/A
Pre-dividerN/A
Slow PLL DividerN/A
R_SELN/A
SEL_DividerN/A
PWM_FREQN/A
PWM_RESN/A
Table 2-18 EEPROM Register Values: LP8860J-Q1
ADDRESS (HEX) VALUE (BIN) VALUE (HEX)
60011011116F
6111111111FF
6211011100DC
6311000010C2
6411010111D7
6511100101E5
6611111010FA
670111011177
680111011177
6911100001E1
6A10111011BB
6B10110111B7
6C0001011117
6D11101111EF
6E10110001B1
6F100010118B
7011001001C9
711000011187
7211100101E5
7311011000D8
740100010145
751000011086
7611011110DE
7710101111AF
78001111113F

Figure 2-9 shows the use case for the LP8860J-Q1.

GUID-241FB440-DC41-4438-9FFE-87CF27D29C03-low.gifFigure 2-9 Use Case for LP8860J-Q1