component
LT8355IUFDM-1#WTRPBF
Public Made by Adomby adom
ANALOG DEVICES Global Sourcing Parts, QFN-28(4x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"manufacturer": "ANALOG DEVICES",
"package": "QFN-28(4x5)",
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"category": "Global Sourcing Parts",
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"digikey": "505-LT8355IUFDM-1#WTRPBFTR-ND",
"mouser": "584-LT8355IUFDM1#WTR"
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"number": "1",
"name": "PWMTG1",
"type": "output",
"description": "High side gate driver for the external series PMOS switch of channel 1, driving the gate between ISP1 - 8.5V and ISP1 and limited to 8.5V typical below ISP1."
},
{
"number": "2",
"name": "ISN1",
"type": "input",
"description": "Kelvin connect to the low side of the channel 1 LED current sense resistor RILED1; current is 250mV/RILED1 while CTRL1 is above 1.5V."
},
{
"number": "3",
"name": "ISP1",
"type": "input",
"description": "Kelvin connect to the high side of the channel 1 LED current sense resistor; if VISP - VISN exceeds about 670mV typical, switching stops and PWMTG1 goes high."
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{
"number": "4",
"name": "FB1",
"type": "input",
"description": "Channel 1 output voltage feedback from a resistive divider; regulates to about 1.2V typical, overvoltage at 1.26V typical, and shorted LED detected below 300mV typical."
},
{
"number": "5",
"name": "VC1",
"type": "passive",
"description": "Internal error amplifier compensation node for channel 1; connect a capacitor or RC network between this pin and ground."
},
{
"number": "6",
"name": "CTRL1",
"type": "input",
"description": "Analog dimming input for channel 1; LED current is (CTRL1 - 500mV)/(4RILED1) when CTRL1 is between 500mV and 1.5V."
},
{
"number": "7",
"name": "FAULT1",
"type": "output",
"description": "Open-drain fault indication for channel 1 short LED, open LED, overvoltage and overcurrent faults; tie through 100k to INTVCC or a supply below 15V."
},
{
"number": "8",
"name": "CTRL2",
"type": "input",
"description": "Analog dimming input for channel 2 used with IADJ2; current is [(CTRL2 - 0.48V) x (IADJ2 - 0.5V) - 0.02V]/(4RILED2) when CTRL2 and IADJ2 are between 0.5V and 1.5V."
},
{
"number": "9",
"name": "IADJ2",
"type": "input",
"description": "Analog dimming multiplier input for channel 2; tie to VREF or INTVCC for full-scale current, and keep between 0.5V and 1.5V for linear programming."
},
{
"number": "10",
"name": "PWM1",
"type": "input",
"description": "PWM dimming control for channel 1; 0.5V to 1.5V selects internal exponential duty ratio, external PWM requires ON above 1.6V and OFF below 0.4V."
},
{
"number": "11",
"name": "PWM2",
"type": "input",
"description": "PWM dimming control for channel 2; 0.5V to 1.5V selects internal exponential duty ratio, external PWM requires ON above 1.6V and OFF below 0.4V."
},
{
"number": "12",
"name": "RT",
"type": "passive",
"description": "Connect only a resistor to ground to set the switching frequency and PWM dimming frequency; other connections may stop correct operation."
},
{
"number": "13",
"name": "FAULT2",
"type": "output",
"description": "Open-drain fault indication for channel 2 short LED, open LED, overvoltage and overcurrent faults; pulled low on any reported fault and must not exceed 15V."
},
{
"number": "14",
"name": "VREF",
"type": "power_out",
"description": "2V typical reference supplying up to 2.5mA at room temperature; bypass with 1uF if needed and leave floating if unused."
},
{
"number": "15",
"name": "EN/UVLO",
"type": "input",
"description": "Enable and programmable UVLO input; switching stops below 1.25V typical, logic high above 1.4V and low below 0.3V, absolute maximum 62V."
},
{
"number": "16",
"name": "VIN",
"type": "power_in",
"description": "Input supply pin with 5V to 60V operating range and absolute maximum 62V; must be locally bypassed."
},
{
"number": "17",
"name": "VC2",
"type": "passive",
"description": "Internal error amplifier compensation node for channel 2; connect a capacitor or RC network between this pin and ground."
},
{
"number": "18",
"name": "FB2",
"type": "input",
"description": "Channel 2 output voltage feedback from a resistive divider; regulates to about 1.2V typical, overvoltage at 1.26V typical, and shorted LED detected below 300mV typical."
},
{
"number": "19",
"name": "ISP2",
"type": "input",
"description": "Kelvin connect to the high side of the channel 2 LED current sense resistor; if VISP - VISN exceeds about 670mV typical, switching stops and PWMTG2 goes high."
},
{
"number": "20",
"name": "ISN2",
"type": "input",
"description": "Kelvin connect to the low side of the channel 2 LED current sense resistor RILED2; current is 250mV/RILED2 while CTRL2 and IADJ2 are above 1.5V."
},
{
"number": "21",
"name": "PWMTG2",
"type": "output",
"description": "High side gate driver for the external series PMOS switch of channel 2, limited to 8.5V typical below ISP2."
},
{
"number": "22",
"name": "INTVCC",
"type": "power_out",
"description": "Internal supply regulated to 7.5V typical; requires at least 2.2uF to ground with 4.7uF recommended and is not intended to power external loads."
},
{
"number": "23",
"name": "GATE2",
"type": "output",
"description": "External NMOS power switch gate driver for channel 2, connected to the gate of an NMOS whose source is at the switch current sense resistor."
},
{
"number": "24",
"name": "SENSEP2",
"type": "input",
"description": "Kelvin connect to the positive side of the grounded switch current sense resistor for channel 2."
},
{
"number": "25",
"name": "SENSEN2",
"type": "input",
"description": "Kelvin connect to the negative side of the switch current sense resistor for channel 2."
},
{
"number": "26",
"name": "SENSEN1",
"type": "input",
"description": "Kelvin connect to the negative side of the switch current sense resistor for channel 1."
},
{
"number": "27",
"name": "SENSEP1",
"type": "input",
"description": "Kelvin connect to the positive side of the grounded switch current sense resistor for channel 1."
},
{
"number": "28",
"name": "GATE1",
"type": "output",
"description": "External NMOS power switch gate driver for channel 1, connected to the gate of an NMOS whose source is at the switch current sense resistor."
},
{
"number": "29",
"name": "GND",
"type": "power_in",
"description": "Exposed pad ground that must be soldered directly to the ground plane."
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"name": "ISP and ISN absolute maximum",
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"name": "EN/UVLO shutdown threshold",
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"max": 1.35,
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{
"name": "INTVCC regulation voltage",
"symbol": "INTVCC",
"kind": "electrical",
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"name": "INTVCC line regulation",
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{
"name": "INTVCC load regulation",
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"name": "INTVCC current limit",
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{
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"name": "LED current sense threshold (VISP – VISN)",
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"name": "LED2 current sense threshold (VISP2 – VISN2)",
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"conditions": "CTRL2 = 2V, IADJ2 = 1V (50%), ISP = 100V",
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"source": "datasheet"
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