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LT3573IMSE#TRPBF

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Analog Devices AC-DC Controllers And Regulators, MSOP-16-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LT3573IMSE#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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lt3573imse-trpbf.step / lt3573imse-trpbf.glb are 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, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF