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LT3573IMSE#TRPBF
Public Made by Adomby adom
Analog Devices AC-DC Controllers And Regulators, 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
markdownLT3573IMSE#TRPBF
Analog Devices · AC-DC Controllers And Regulators · MSOP-16-EP
LT3573IMSE#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 | GND | power_in | Ground pin for the LT3573 control and power circuitry. |
| 2 | TEST | input | Test pin used for testing only, which must be connected to ground for the part to operate properly. |
| 3 | GND | power_in | Ground pin for the LT3573 control and power circuitry. |
| 4 | SW | output | Collector node of the integrated 1.25A, 60V NPN output switch that carries large currents, so its traces should be kept as short as possible; SW absolute maximum is 60V. |
| 5 | VIN | power_in | Input supply pin for start-up circuitry and the reference for the DCM comparator and feedback; operates from 3V to 40V and must be locally bypassed with a capacitor. |
| 6 | BIAS | power_in | Supplies current to the switch driver and internal circuitry, regulated to 2.9V to 3.1V at 30mA, and must be locally bypassed; it may tie to VIN only if no third winding is used and VIN is 15V or less. |
| 7 | SHDN/UVLO | input | Shutdown and undervoltage lockout pin, where a resistor divider from VIN sets the minimum operating input voltage; the rising threshold is 1.15V to 1.29V (1.22V typ) with 2.5µA hysteresis current, and the absolute maximum is 40V. |
| 8 | GND | power_in | Ground pin for the LT3573 control and power circuitry. |
| 9 | GND | power_in | Ground pin for the LT3573 control and power circuitry. |
| 10 | TC | passive | Output voltage temperature compensation pin, where a resistor to ground sets a PTAT current ITC = 0.55V/RTC sourced into RREF; the absolute maximum is 5V. |
| 11 | RREF | passive | External ground-referred reference resistor pin, nominally about 6k though not required to be exact, with an absolute maximum of 5V. |
| 12 | RFB | input | External feedback resistor input connected to the transformer primary (VSW), carrying about 200µA average during flyback; the absolute maximum is 40V. |
| 13 | VC | passive | Compensation pin for the internal error amplifier, requiring a series RC to ground and an optional 100pF capacitor in parallel; the absolute maximum is 5V. |
| 14 | RILIM | passive | Maximum current limit adjust pin, where a resistor to ground sets the switch current limit and a 10k resistor gives full switch current capability (1.25A min, 1.55A typ, 1.85A max); the absolute maximum is 5V. |
| 15 | SS | passive | Soft-start pin, where a capacitor limits start-up inrush current and output voltage ramp rate, and switching begins when the voltage reaches about 0.7V; the absolute maximum is 5V. |
| 16 | GND | power_in | Ground pin for the LT3573 control and power circuitry. |
| 17 | EXPOSED PAD | power_in | Exposed pad is ground and must be soldered to the board and connected with many vias to an internal ground plane for electrical contact and thermal performance. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | MSOP-16-EP |
| Category | Power Management (PMIC) |
| 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 |
|---|---|---|---|---|---|---|---|
| Input Voltage Range | 3 | 40 | V | 2 | |||
| Quiescent Current | 3.5 | mA | SS = 0V | 2 | |||
| Quiescent Current | 0 | 1 | µA | VSHDN/UVLO = 0V | 2 | ||
| SHDN/UVLO Pin Threshold | 1.15 | 1.22 | 1.29 | V | UVLO Pin Voltage Rising | 2 | |
| SHDN/UVLO Pin Hysteresis Current | 2 | 2.5 | 3 | µA | VUVLO = 1V | 2 | |
| Switch Current Limit | 1.25 | 1.55 | 1.85 | A | RILIM = 10k | 2 | |
| Switch VCESAT | 150 | 250 | mV | ISW = 0.5A | 2 | ||
| RREF Voltage | 1.21 | 1.23 | 1.25 | V | VIN = 3V | 2 | |
| RREF Voltage (full temperature range) | 1.2 | 1.25 | V | l, VIN = 3V | 2 | ||
| RREF Voltage Line Regulation | 0.01 | 0.03 | %/V | 3V < VIN < 40V | 2 | ||
| RREF Pin Bias Current | 100 | 600 | nA | l, Note 3 | 2 | ||
| BIAS Pin Voltage | 2.9 | 3 | 3.1 | V | IBIAS = 30mA | 3 | |
| Soft-Start Current | 7 | µA | SS = 0.4V | 2 | |||
| Soft-Start Threshold | 0.7 | V | 2 | ||||
| Maximum Switching Frequency | 1000 | kHz | 2 | ||||
| Minimum Current Limit | 200 | mA | VC = 0V | 2 | |||
| IREF Reference Current | 190 | µA | Measured at RFB pin with RREF = 6.49k | 2 | |||
| Error Amplifier Voltage Gain | 150 | V/V | VIN = 3V | 3 | |||
| Error Amplifier Transconductance | 150 | µmhos | DI = 10µA, VIN = 3V | 3 | |||
| Minimum Switching Frequency | 40 | kHz | VC = 0.35V | 3 | |||
| TC Current into RREF | 27.5 | µA | RTC = 20.1k | 3 | |||
| VIN, SHDN/UVLO, RFB, BIAS Pin Voltage | 40 | V | 2 | ||||
| SS, VC, TC, RREF, RILIM Pin Voltage | 5 | V | 2 | ||||
| Maximum Junction Temperature | 125 | °C | 2 | ||||
| Operating Junction Temperature Range | -40 | 125 | °C | Printed for LT3573E; LT3573I guaranteed -40°C to 125°C per Note 2 | 2 | ||
| Storage Temperature Range | -65 | 150 | °C | 2 | |||
| Thermal Resistance, Junction to Ambient | θJA | 50 | °C/W | 2 | |||
| Thermal Resistance, Junction to Case | θJC | 10 | °C/W | 2 |
CAD (KiCad official)
- Symbol:
LT3573IMSE#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:
lt3573imse-trpbf-etched.step/lt3573imse-trpbf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lt3573imse-trpbf.step/lt3573imse-trpbf.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Analog Devices datasheet (26 pp, sha256
3f66b761923d7550, retrieved 2026-10-21, 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).