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LT3795HFE#PBF
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Analog Devices LED Drivers, TSSOP-28-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLT3795HFE#PBF
Analog Devices · LED Drivers · TSSOP-28-EP
LT3795HFE#PBF from Analog Devices, in a TSSOP-28-EP. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | ISP | passive | Connection point for the positive terminal of the current feedback resistor (RLED), which also serves as the positive rail for the TG pin driver. |
| 2 | ISN | passive | Connection point for the negative terminal of the current feedback resistor (RLED). |
| 3 | TG | output | Top gate driver output that inverts and level-shifts the PWM signal to drive a series PMOS between VISP and (VISP - 7V) when VISP > 7V, with an internal 7V clamp limiting VGS; leave unconnected if not used. |
| 4 | GND | power_in | Ground that also serves as the control-loop current sense input, sensing the negative terminal of the N-channel source sense resistor. |
| 5 | ISMON | output | ISP/ISN current report pin with VISMON = ILED • RLED • 4, driven to ground when PWM is low; leave unconnected if not used and bypass with 47nF or higher if needed. |
| 6 | CTRL2 | input | Current sense threshold adjustment pin 2, identical in function to CTRL1; it must not be left open, and connecting it to GND gives zero LED current. |
| 7 | FB | input | Voltage loop feedback pin regulated to 1.25V nominal for constant-voltage and LED protection; it must not be tied to GND, and driving it above 1.3V pulls GATE low and drives TG high. |
| 8 | VC | passive | Transconductance error amplifier output used to stabilize the loop with an RC network; it is high impedance when PWM is low and must not be left open. |
| 9 | CTRL1 | input | Current sense threshold adjustment pin 1, identical in function to CTRL2; connect to VREF for the 250mV default threshold and do not leave open. |
| 10 | VREF | power_in | Voltage reference output, typically 2.015V, that can supply up to 100µA to drive CTRL pin resistor dividers. |
| 11 | SS | passive | Soft-start and fault timer pin with a 28µA typical pull-up to an internal 2.5V rail; it must be discharged below 0.2V to restart and must not be left open. |
| 12 | RT | passive | Switching frequency adjustment pin set by a resistor to GND (see the Typical Performance curve or Table 2); must not be left open. |
| 13 | RAMP | input | Spread spectrum modulation pin where the modulation frequency is set by 12µA/(2 • 1V • CRAMP); tie to GND if not used. |
| 14 | PWM | input | PWM input where a low signal turns off switching and drives TG to the ISP level; it has an internal 500k pull-down and should connect to VREF if not used. |
| 15 | SHORTLED | output | Open-collector pull-down that asserts on FB < 0.3V after SS reaches 1.7V at start-up or on LED overcurrent (V(ISP-ISN) > 375mV), and requires an external pull-up. |
| 16 | OPENLED | output | Open-collector pull-down that asserts when FB is above 1.20V (typical) and V(ISP-ISN) is below 25mV (typical), and requires an external pull-up. |
| 17 | GND | power_in | Ground pin, same function as pin 4. |
| 18 | SENSE | input | Current sense input for the control loop, to be Kelvin-connected to the positive terminal of the N-channel source sense resistor RSENSE. |
| 19 | GATE | output | N-channel MOSFET gate driver output that switches between INTVCC and GND and is driven to GND during shutdown, fault or idle states. |
| 20 | INTVCC | power_out | Regulated internal supply, typically 7.7V from VIN, for internal loads and the GATE driver; bypass with 4.7µF close to the pin, or connect directly to VIN if VIN is always ≤ 8V. |
| 21 | GND | power_in | Ground pin, same function as pin 4. |
| 22 | GND | power_in | Ground pin, same function as pin 4. |
| 23 | VIN | power_in | Input supply pin (110V absolute maximum) that must be locally bypassed with a 0.22µF or larger capacitor placed close to the IC. |
| 24 | EN/UVLO | input | Enable and undervoltage lockout pin with an accurate 1.22V falling threshold; tie to 0.4V or less to disable the device, and it is rated 110V absolute maximum. |
| 25 | OVLO | input | Input overvoltage lockout pin with an accurate 1.25V rising threshold that enables switching when power is OK; rated 8V absolute maximum. |
| 26 | IVINN | passive | Connection point for the negative terminal of the input current sense resistor RINSNS, where IIN = 60mV/RINSNS. |
| 27 | IVINP | passive | Connection point for the positive terminal of the input current sense resistor RINSNS. |
| 28 | IVINCOMP | output | Input current sense amplifier output with VIVINCOMP = IIN • RINSNS • 20; it requires a 10nF or larger capacitor to GND and must not be left open or loaded with current. |
| 29 | GND | power_in | Exposed pad ground that must be soldered directly to the PCB ground plane. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | TSSOP-28-EP |
| Category | LED Drivers |
| Pins | 29 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| VIN | VIN | 110 | V | 2 | |||
| EN/UVLO | EN/UVLO | 110 | V | 2 | |||
| ISP, ISN | ISP, ISN | 110 | V | 2 | |||
| IVINP, IVINN | IVINP, IVINN | 110 | V | 2 | |||
| VIN - IVINN | VIN - IVINN | -0.3 | 4 | V | 2 | ||
| PWM, SHORTLED, OPENLED | PWM, SHORTLED, OPENLED | 12 | V | 2 | |||
| FB, RAMP, OVLO | FB, RAMP, OVLO | 8 | V | 2 | |||
| CTRL1, CTRL2 | CTRL1, CTRL2 | 15 | V | 2 | |||
| ISMON, IVINCOMP | ISMON, IVINCOMP | 5 | V | 2 | |||
| VC, VREF, SS | VC, VREF, SS | 3 | V | 2 | |||
| RT | RT | 2 | V | 2 | |||
| Operating Junction Temperature Range (LT3795H) | TJ | -40 | 150 | °C | LT3795H grade | 2 | |
| Storage Temperature Range | TSTG | -65 | 150 | °C | 2 | ||
| Maximum Junction Temperature | TJMAX | 150 | °C | 2 | |||
| Thermal Resistance, Junction to Ambient | θJA | 30 | °C/W | 2 | |||
| Thermal Resistance, Junction to Case | θJC | 10 | °C/W | 2 | |||
| VIN Minimum Operating Voltage | VIN | 4.5 | V | VIN Tied to INTVCC | 3 | ||
| VIN Shutdown IQ | IQ | 10 | µA | EN/UVLO = 0V, PWM = 0V | 3 | ||
| VIN Shutdown IQ | IQ | 22 | µA | EN/UVLO = 1.15V, PWM = 0V | 3 | ||
| VIN Operating IQ (Not Switching) | IQ | 2.9 | 3.5 | mA | RT = 82.5k to GND, FB = 1.5V | 3 | |
| VREF Voltage | VREF | 1.97 | 2.015 | 2.06 | V | -100µA ≤ IREF ≤ 10µA | 3 |
| VREF Pin Line Regulation | VREF | 1.5 | m%/V | 4.5V < VIN < 110V | 3 | ||
| SENSE Current Limit Threshold | SENSE | 100 | 117 | 125 | mV | 3 | |
| SS Sourcing Current | SS | 28 | µA | SS = 0V | 3 | ||
| Full Scale LED Current Sense Threshold (V(ISP-ISN)) | V(ISP-ISN) | 243 | 250 | 257 | mV | ISP = 48V, CTRL1 ≥ 1.2V, CTRL2 ≥ 1.2V | 3 |
| 9/10th LED Current Sense Threshold (V(ISP-ISN)) | V(ISP-ISN) | 220 | 225 | 230 | mV | ISP = 48V, CTRL1 = 1V, CTRL2 = 1.2V | 3 |
| 1/2 LED Current Sense Threshold (V(ISP-ISN)) | V(ISP-ISN) | 119 | 125 | 130 | mV | ISP = 48V, CTRL1 = 0.6V, CTRL2 = 1.2V | 3 |
| 1/10th LED Current Sense Threshold (V(ISP-ISN)) | V(ISP-ISN) | 16 | 25 | 32 | mV | ISP = 48V, CTRL1 = 0.2V, CTRL2 = 1.2V | 3 |
| ISP/ISN Current Monitor Voltage (VISMON) | VISMON | 0.96 | 1 | 1.04 | V | V(ISP-ISN) = 250mV, ISP = 48V, -50µA ≤ IISMON ≤ 0 µA | 3 |
| ISP/ISN Overcurrent Protection Threshold (V(ISP-ISN)) | V(ISP-ISN) | 360 | 375 | 390 | mV | ISN = 48V | 3 |
| CTRL1, CTRL2 Input Bias Current | ICTRL | 50 | 200 | nA | Current Out of Pin, CTRL = 1V | 3 | |
| ISP/ISN Current Sense Amplifier Input Common Mode Range | VISP, VISN | 0 | 110 | V | 3 | ||
| ISP/ISN Input Current Bias Current (Combined) | IISP, IISN | 700 | µA | PWM = 5V (Active), ISP = 48V | 3 | ||
| ISP/ISN Input Current Bias Current (Combined) | IISP, IISN | 0 | 0.1 | µA | PWM = 0V (Standby), ISP = 48V | 3 | |
| VC Output Impedance | VC | 2000 | kΩ | 3 | |||
| VC Standby Input Bias Current | IVC | -20 | 20 | nA | PWM = 0V | 3 | |
| FB Regulation Voltage (VFB) | VFB | 1.23 | 1.25 | 1.27 | V | ISP = ISN = 48V | 3 |
| FB Regulation Voltage (VFB) | VFB | 1.238 | 1.25 | 1.264 | V | ISP = ISN = 48V | 3 |
| FB Pin Input Bias Current | IFB | 40 | 200 | nA | Current Out of Pin, FB = VFB | 3 | |
| FB SHORTLED Threshold | FB | 300 | 350 | mV | SHORTLED Falling | 3 | |
| Input Current Sense Amplifier Input Voltage Common Range (VIVINP/VIVINN) | VIVINP/VIVINN | 2.5 | 110 | V | 4 | ||
| Input Current Sense Threshold (VIVINP - VIVINN) | VIVINP - VIVINN | 57 | 60 | 63 | mV | VIVINP = 48V, VIN = 48V | 4 |
| Input Current Monitor V(IVINCOMP) | V(IVINCOMP) | 0.94 | 1 | 1.06 | V | VIVINP-VIVINN = 50mV, VIN = 48V | 4 |
| Input Bias Current (I(IVINN)) | I(IVINN) | 100 | 1000 | nA | VIVINP-VIVINN = 50mV, VIN = 48V | 4 | |
| INTVCC Regulation Voltage | INTVCC | 7.4 | 7.7 | 8 | V | 4 | |
| Dropout (VIN-INTVCC) | VIN-INTVCC | 550 | mV | IINTVCC = -10mA, VIN = 4.5V | 4 | ||
| INTVCC Undervoltage Lockout | INTVCC UVLO | 3.8 | 4 | 4.1 | V | 4 | |
| Switching Frequency | fSW | 85 | 105 | 125 | kHz | RT = 82.5k | 4 |
| Switching Frequency | fSW | 340 | 400 | 480 | kHz | RT = 19.6k | 4 |
| Switching Frequency | fSW | 900 | 1000 | 1150 | kHz | RT = 6.65k | 4 |
| PWM Input Threshold Rising | PWM | 0.96 | 1 | 1.04 | V | 4 | |
| EN/UVLO Threshold Voltage Falling | EN/UVLO | 1.185 | 1.22 | 1.25 | V | 4 | |
| OVLO Threshold Voltage Rising | OVLO | 1.215 | 1.25 | 1.28 | V | 4 |
CAD (KiCad official)
- Symbol:
LT3795HFE#PBF - Footprint:
Package_SO:TSSOP-28-1EP_4.4x9.7mm_P0.65mm_EP2.85x6.7mm - 3D model: TSSOP-28-EP (KiCad packages3D, STEP)
- 3D model files:
lt3795hfe-pbf-etched.step/lt3795hfe-pbf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lt3795hfe-pbf.step/lt3795hfe-pbf.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Analog Devices datasheet (32 pp, sha256
11ad89e3aee599fa, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).