component
LT3755EMSE-2#TRPBF
Public Made by Adomby adom
Analog Devices LED Drivers, MSOP-16-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
markdownLT3755EMSE-2#TRPBF
Analog Devices · LED Drivers · MSOP-16-EP
LT3755EMSE-2#TRPBF from Analog Devices, in a MSOP-16-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 | PWMOUT | output | Buffered PWM output driven from INTVCC for an LED load disconnect NMOS or level shifter, and it toggles when FB exceeds VFB + 60mV (typical), so a FET with gate cut-off above 1V is recommended. |
| 2 | FB | input | Voltage loop feedback pin that the internal transconductance amplifier regulates to 1.25V (nominal), must not be left open, and should be connected to GND if unused. |
| 3 | ISN | input | Negative terminal connection of the current feedback resistor, where LED current is set by 100mV/RLED, and below 3V it acts as a short-circuit input that forces GATE low if ISP exceeds ISN by more than 150mV (typical). |
| 4 | ISP | input | Positive terminal connection of the current feedback resistor, whose input bias current depends on the CTRL voltage, and it is a short-circuit protection input when ISN is below 3V. |
| 5 | VC | passive | Transconductance error amplifier output used to compensate the voltage loop with an RC network, which is high impedance when PWM is low and should have a capacitor to GND with a series resistor recommended. |
| 6 | CTRL | input | Current sense threshold adjustment pin where the threshold follows 1/10 of VCTRL plus an offset for 0V to 1V and is constant at 100mV full scale above 1.2V, and it must not be left open. |
| 7 | VREF | power_out | Voltage reference output, typically 2V, that can supply up to 100µA and is used to drive a resistor divider for the CTRL pin. |
| 8 | PWM | input | PWM dimming input where a low signal turns off the switcher, idles the oscillator and disconnects VC from internal loads, with an internal pull-down and connection to INTVCC recommended if unused. |
| 9 | OPENLED | output | Open-collector pull-down on the LT3755-2 that asserts when FB is above the regulation threshold minus 50mV (typical) and requires an external pull-up current of less than 1mA; on the LT3755-1 this pin is SYNC instead. |
| 10 | SS | passive | Soft-start pin with a 10µA (typical) pull-up current to an internal 2.5V rail that is set by an external capacitor and reset to GND by undervoltage or thermal limit. |
| 11 | RT | passive | Switching frequency adjustment pin set by a resistor to GND, which must not be left open. |
| 12 | SHDN/UVLO | input | Shutdown and undervoltage detect pin with an accurate 1.22V falling threshold, which must be tied to 0.4V or less to disable the device and reduce VIN quiescent current below 1µA. |
| 13 | INTVCC | power_out | Regulated supply output of 7.15V (typical) for internal loads and the GATE and PWMOUT drivers, which must be bypassed with a 4.7µF capacitor close to the pin and connected directly to VIN if VIN is always 8V or less. |
| 14 | VIN | power_in | Input supply pin for the device, which must be locally bypassed with a 0.22µF (or larger) capacitor placed close to the IC. |
| 15 | SENSE | input | Current sense input for the control loop that must be Kelvin connected to the positive terminal of the NFET source sense resistor, with its negative terminal Kelvin connected to the IC ground plane. |
| 16 | GATE | output | N-channel FET gate driver output that switches between INTVCC and GND and is driven to GND during shutdown, fault or idle states. |
| 17 | GND | power_in | Exposed pad ground that also serves as the control-loop current sense return for the negative terminal of the sense resistor, and it must be soldered directly to the ground plane. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | MSOP-16-EP |
| Category | LED Drivers |
| Pins | 17 |
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 Minimum Operating Voltage | 4.5 | V | VIN Tied to INTVCC | 3 | |||
| VIN Shutdown IQ | IQ | 0.1 | 1 | µA | SHDN/UVLO = 0V, PWM = 0V | 3 | |
| VIN Shutdown IQ | IQ | 5 | µA | SHDN/UVLO = 1.15V, PWM = 0V | 3 | ||
| VIN Operating IQ (Not Switching) | IQ | 1.4 | 1.7 | mA | PWM = 0V | 3 | |
| VREF Voltage | VREF | 1.965 | 2 | 2.045 | V | 100µA ≤ IVREF ≤ 0µA (E, I, H-Grades); full operating temperature range | 3 |
| SENSE Current Limit Threshold | 98 | 108 | 118 | mV | Full operating temperature range (l) | 3 | |
| SS Pull-Up Current | 8 | 10 | 13 | µA | Current Out of Pin | 3 | |
| ISP/ISN Full-Scale Current Sense Threshold (E, I, H grades) | 96 | 100 | 103 | mV | FB = 0V, ISP = 48V; full operating temperature range (l) | 3 | |
| ISP/ISN Full-Scale Current Sense Threshold at CTRL = 0V | -12 | -9.5 | -7 | mV | CTRL = 0V, FB = 0V, ISP = 48V | 3 | |
| CTRL Pin Range for Current Sense Threshold Adjustment | 0 | 1.1 | V | Full operating temperature range (l) | 3 | ||
| CTRL Input Bias Current | 50 | 100 | nA | Current Out of Pin | 3 | ||
| LED Current Sense Amplifier Input Common Mode Range (VISN) | VISN | 2.9 | 75 | V | Full operating temperature range (l) | 3 | |
| ISP/ISN Short-Circuit Threshold | 115 | 150 | 200 | mV | ISN = 0V | 3 | |
| ISP/ISN Short-Circuit Fault Sensing Common Mode Range (VISN) | VISN | 0 | 3 | V | Full operating temperature range (l) | 3 | |
| ISP/ISN Input Bias Current (Combined), Active | 55 | µA | PWM = 5V (Active), ISP = ISN = 48V | 3 | |||
| ISP/ISN Input Bias Current (Combined), Standby | 0 | 0.1 | µA | PWM = 0V (Standby), ISP = ISN = 48V | 3 | ||
| VC Standby Input Bias Current | -20 | 20 | nA | PWM = 0V | 4 | ||
| FB Regulation Voltage (E, I grades) | VFB | 1.232 | 1.25 | 1.265 | V | ISP = ISN; full operating temperature range (l) | 4 |
| FB Pin Input Bias Current | 40 | 100 | nA | Current Out of Pin | 4 | ||
| FB Open LED Threshold (OPENLED falling) | VFB | -65 | -50 | -40 | mV | OPENLED Falling (LT3755-2); printed as VFB, 65mV / VFB, 50mV / VFB, 40mV | 4 |
| FB Overvoltage Threshold (PWMOUT falling) | VFB | 50 | 60 | 75 | mV | PWMOUT Falling; printed as VFB + 50mV / VFB + 60mV / VFB + 75mV | 4 |
| Switching Frequency | 90 | 100 | 125 | kHz | RT = 100k; full operating temperature range (l) | 4 | |
| Switching Frequency | 925 | 1000 | 1050 | kHz | RT = 10k; full operating temperature range (l) | 4 | |
| INTVCC Regulation Voltage | INTVCC | 7 | 7.15 | 7.3 | V | 4 | |
| INTVCC Undervoltage Lockout | 3.9 | 4.1 | 4.3 | V | 4 | ||
| INTVCC Current Limit | 29 | 34 | 40 | mA | 4 | ||
| INTVCC Current in Shutdown | 8 | 12 | µA | SHDN/UVLO = 0V, INTVCC = 7V | 4 | ||
| PWM Input High Voltage | 1.5 | V | Full operating temperature range (l) | 4 | |||
| PWM Input Low Voltage | 0.4 | V | Full operating temperature range (l) | 4 | |||
| PWM Pin Resistance to GND | 45 | 60 | kΩ | 4 | |||
| PWMOUT Output Low (VOL) | VOL | 0 | 50 | mV | 4 | ||
| SHDN/UVLO Threshold Voltage Falling (E, I grades) | 1.185 | 1.22 | 1.245 | V | Falling, E-, I-Grades; full operating temperature range (l) | 4 | |
| SHDN/UVLO Pin Bias Current Low | 1.7 | 2.05 | 2.5 | µA | SHDN/UVLO = 1.15V | 4 | |
| SHDN/UVLO Pin Bias Current High | 10 | 100 | nA | SHDN/UVLO = 1.30V | 4 | ||
| VCC Input Voltage absolute maximum (VIN) | VIN | 40 | V | 2 | |||
| SHDN/UVLO pin voltage absolute maximum | SHDN/UVLO | 40 | V | Note 3 | 2 | ||
| ISP, ISN pin voltage absolute maximum | ISP, ISN | 75 | V | 2 | |||
| INTVCC pin voltage absolute maximum | INTVCC | 8 | V | Printed as VIN + 0.3V, 8V | 2 | ||
| CTRL, PWM, OPENLED pin voltage absolute maximum | 12 | V | 2 | ||||
| VC, VREF, SS, FB pin voltage absolute maximum | 3 | V | 2 | ||||
| Operating Junction Temperature Range | TJ | -40 | 125 | °C | LT3755E/LT3755I | 2 | |
| Storage Temperature Range | -65 | 150 | °C | 2 | |||
| Lead Temperature (MSOP) | 300 | °C | Soldering, 10 sec | 2 | |||
| Thermal Resistance Junction-to-Ambient (MSE) | θJA | 43 | °C/W | 16-Lead Plastic MSOP (MSE package) | 2 | ||
| Thermal Resistance Junction-to-Case (MSE) | θJC | 4 | °C/W | 16-Lead Plastic MSOP (MSE package) | 2 |
CAD (KiCad official)
- Symbol:
LT3755EMSE-2#TRPBF - Footprint:
Package_SO:MSOP-16-1EP_3x4.039mm_P0.5mm_EP1.651x2.845mm - 3D model: MSOP-16-EP (KiCad packages3D, STEP)
- 3D model files:
lt3755emse-2-trpbf-etched.step/lt3755emse-2-trpbf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lt3755emse-2-trpbf.step/lt3755emse-2-trpbf.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Analog Devices datasheet (28 pp, sha256
ba2dd4c41f3d59ab, retrieved 2026-10-20, 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).