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LT3973EMSE-3.3#PBF
Public Made by Adomby adom
Analog Devices DC-DC Converters, MSOP-10-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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LT3973EMSE-3.3#PBF
Analog Devices · DC-DC Converters · MSOP-10-EP
LT3973EMSE-3.3#PBF from Analog Devices, in a MSOP-10-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 | VOUT | input | For the LT3973-3.3, this pin connects to the internal feedback divider that programs the fixed 3.3V output, and the datasheet gives an absolute maximum of 6V for FB/VOUT. |
| 2 | OUT | power_in | This pin supplies the VIN-to-VOUT regulation during dropout and sources current to charge the boost capacitor, and it must be tied to GND if the programmed output is greater than 14V (OUT absolute maximum is 14V). |
| 3 | EN/UVLO | input | The part is in shutdown when this pin is low and active when high, with a 1.19V rising threshold and 30mV hysteresis, and the absolute maximum rating is 42V; ground it to shut down the part if VIN is below 4.2V. |
| 4 | VIN | power_in | This pin supplies the internal circuitry and internal power switch and must be locally bypassed, with an operating input range of 4.2V to 42V and an absolute maximum of 42V. |
| 5 | GND | power_in | This is the ground pin and must be connected to the same ground as the exposed pad (pin 11), which must be soldered to the PCB. |
| 6 | SW | output | This pin is the output of the internal power switch and connects to the inductor. |
| 7 | BOOST | power_in | This pin provides a drive voltage higher than VIN to the internal NPN power switch, with absolute maximum limits of 55V on BOOST and 25V BOOST above SW. |
| 8 | BD | power_in | This pin is the anode connection of the boost diode and supplies current to the internal regulator when BD is above 3.2V, with an absolute maximum of 25V. |
| 9 | PG | output | This is the open-drain power good output that stays low until FB is within 10% of the regulation voltage, is valid when VIN is above 4.2V and EN/UVLO is high, and has an absolute maximum of 6V. |
| 10 | RT | passive | A resistor from this pin to ground sets the switching frequency, which the datasheet specifies over a 200kHz to 2.2MHz range. |
| 11 | GND | power_in | The exposed pad is ground and must be soldered to the PCB for electrical connection and thermal dissipation. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | MSOP-10-EP |
| Category | Power Management ICs |
| Pins | 11 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| BOOST Pin Above SW Pin | 25 | V | (Note 1) | 2 | |||
| FB/VOUT, RT, PG Voltage | 6 | V | (Note 1); FB/VOUT pin is VOUT for LT3973-3.3 | 2 | |||
| BD Voltage | 25 | V | (Note 1) | 2 | |||
| Storage Temperature Range | -65 | 150 | °C | 2 | |||
| Operating Junction Temperature Range | -40 | 125 | °C | LT3973E/LT3973E-X (Note 2) | 2 | ||
| Quiescent Current from VIN | 0.75 | 1.3 | µA | VEN/UVLO Low | 3 | ||
| Quiescent Current from VIN | 1.8 | 2.8 | µA | VEN/UVLO High | 3 | ||
| Quiescent Current from VIN | 6 | µA | VEN/UVLO High, -40°C to 125°C (l) | 3 | |||
| Minimum Input Voltage (Note 3) | 3.8 | 4.2 | V | l: full operating temperature range | 3 | ||
| LT3973-3.3 Output Voltage | 3.26 | 3.3 | 3.34 | V | l: full operating temperature range (first printed limit set) | 3 | |
| LT3973-3.3 Output Voltage | 3.234 | 3.3 | 3.366 | V | l: full operating temperature range (second printed limit set) | 3 | |
| FB/Output Voltage Line Regulation | 0.0002 | 0.01 | %/V | 4.2V < VIN < 40V | 3 | ||
| Switching Frequency | 1.72 | 2.15 | 2.58 | MHz | RT = 41.2k, VIN = 6V | 3 | |
| Switching Frequency | 632 | 790 | 948 | kHz | RT = 158k, VIN = 6V | 3 | |
| Switching Frequency | 156 | 195 | 234 | kHz | RT = 768k, VIN = 6V | 3 | |
| Switch Current Limit | 1.237 | 1.65 | 1.98 | A | VIN = 5V, VFB = 0V, l | 3 | |
| Catch Schottky Current Limit | 0.92 | 1.15 | 1.44 | A | VIN = 5V, l | 3 | |
| Switch Leakage Current | 0.05 | 2 | µA | 3 | |||
| Catch Schottky Reverse Leakage | 0.05 | 2 | µA | VSW = 12V | 3 | ||
| Boost Schottky Reverse Leakage | 0.02 | 2 | µA | VREVERSE = 12V | 3 | ||
| Minimum Boost Voltage (Note 4) | 1.4 | 1.8 | V | VIN = 5V, l | 3 | ||
| BOOST Pin Current | 10 | 13 | mA | ISW = 500mA, VBOOST = 15V | 3 | ||
| Dropout Comparator Threshold (VIN - OUT) | 400 | 490 | 580 | mV | Falling, VIN = 5V, l | 3 | |
| EN/UVLO Pin Current | 1 | 30 | nA | VEN/UVLO = 12V | 4 | ||
| EN/UVLO Voltage Threshold (falling) | 1.09 | 1.16 | 1.23 | V | EN/UVLO Falling, VIN ≥ 4.2V, l | 4 | |
| EN/UVLO Voltage Threshold (rising) | 1.12 | 1.19 | 1.28 | V | EN/UVLO Rising, VIN ≥ 4.2V, l | 4 | |
| EN/UVLO Voltage Hysteresis | 30 | 45 | mV | 4 | |||
| PG Threshold Offset from Feedback Voltage | 6.5 | 10 | 13.5 | % | VFB Rising | 4 | |
| PG Leakage | 0.01 | 1 | µA | VPG = 3V | 4 | ||
| PG Sink Current | 220 | 350 | µA | VPG = 0.4V, l | 4 | ||
| Minimum Switch Off-Time (Note 5) | 130 | 180 | ns | VIN = 10V | 4 | ||
| Thermal Resistance, Junction to Ambient | θJA | 45 | °C/W | MSE package (10-lead MSOP, exposed pad) | 2 | ||
| Thermal Resistance, Junction to Case | θJC | 10 | °C/W | MSE package (10-lead MSOP, exposed pad) | 2 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| housing | ABS | LT3973HMSE-5#PBF LT3973HMSE-5#TRPBF LTGGD 10-Lead Plastic MSOP -40°C to 150°C ABSOLUTE MAXIMUM RATINGS | 2 |
CAD (KiCad official)
- Symbol:
LT3973EMSE-3.3#PBF - Footprint:
Package_SO:MSOP-10-1EP_3x3mm_P0.5mm_EP1.68x1.88mm - 3D model: MSOP-10-EP (KiCad packages3D, STEP)
- 3D model files:
lt3973emse-3-3-pbf-etched.step/lt3973emse-3-3-pbf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lt3973emse-3-3-pbf.step/lt3973emse-3-3-pbf.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Analog Devices datasheet (24 pp, sha256
8b84083bfbac6278, retrieved 2026-10-30, tier: manufacturer) - 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).
# LT3973EMSE-3.3#PBF
**Analog Devices** · DC-DC Converters · MSOP-10-EP
LT3973EMSE-3.3#PBF from Analog Devices, in a MSOP-10-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 | VOUT | input | For the LT3973-3.3, this pin connects to the internal feedback divider that programs the fixed 3.3V output, and the datasheet gives an absolute maximum of 6V for FB/VOUT. |
| 2 | OUT | power_in | This pin supplies the VIN-to-VOUT regulation during dropout and sources current to charge the boost capacitor, and it must be tied to GND if the programmed output is greater than 14V (OUT absolute maximum is 14V). |
| 3 | EN/UVLO | input | The part is in shutdown when this pin is low and active when high, with a 1.19V rising threshold and 30mV hysteresis, and the absolute maximum rating is 42V; ground it to shut down the part if VIN is below 4.2V. |
| 4 | VIN | power_in | This pin supplies the internal circuitry and internal power switch and must be locally bypassed, with an operating input range of 4.2V to 42V and an absolute maximum of 42V. |
| 5 | GND | power_in | This is the ground pin and must be connected to the same ground as the exposed pad (pin 11), which must be soldered to the PCB. |
| 6 | SW | output | This pin is the output of the internal power switch and connects to the inductor. |
| 7 | BOOST | power_in | This pin provides a drive voltage higher than VIN to the internal NPN power switch, with absolute maximum limits of 55V on BOOST and 25V BOOST above SW. |
| 8 | BD | power_in | This pin is the anode connection of the boost diode and supplies current to the internal regulator when BD is above 3.2V, with an absolute maximum of 25V. |
| 9 | PG | output | This is the open-drain power good output that stays low until FB is within 10% of the regulation voltage, is valid when VIN is above 4.2V and EN/UVLO is high, and has an absolute maximum of 6V. |
| 10 | RT | passive | A resistor from this pin to ground sets the switching frequency, which the datasheet specifies over a 200kHz to 2.2MHz range. |
| 11 | GND | power_in | The exposed pad is ground and must be soldered to the PCB for electrical connection and thermal dissipation. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | MSOP-10-EP |
| Category | Power Management ICs |
| Pins | 11 |
## Electrical characteristics
Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| BOOST Pin Above SW Pin | | | | 25 | V | (Note 1) | 2 |
| FB/VOUT, RT, PG Voltage | | | | 6 | V | (Note 1); FB/VOUT pin is VOUT for LT3973-3.3 | 2 |
| BD Voltage | | | | 25 | V | (Note 1) | 2 |
| Storage Temperature Range | | -65 | | 150 | °C | | 2 |
| Operating Junction Temperature Range | | -40 | | 125 | °C | LT3973E/LT3973E-X (Note 2) | 2 |
| Quiescent Current from VIN | | | 0.75 | 1.3 | µA | VEN/UVLO Low | 3 |
| Quiescent Current from VIN | | | 1.8 | 2.8 | µA | VEN/UVLO High | 3 |
| Quiescent Current from VIN | | | | 6 | µA | VEN/UVLO High, -40°C to 125°C (l) | 3 |
| Minimum Input Voltage (Note 3) | | 3.8 | | 4.2 | V | l: full operating temperature range | 3 |
| LT3973-3.3 Output Voltage | | 3.26 | 3.3 | 3.34 | V | l: full operating temperature range (first printed limit set) | 3 |
| LT3973-3.3 Output Voltage | | 3.234 | 3.3 | 3.366 | V | l: full operating temperature range (second printed limit set) | 3 |
| FB/Output Voltage Line Regulation | | | 0.0002 | 0.01 | %/V | 4.2V < VIN < 40V | 3 |
| Switching Frequency | | 1.72 | 2.15 | 2.58 | MHz | RT = 41.2k, VIN = 6V | 3 |
| Switching Frequency | | 632 | 790 | 948 | kHz | RT = 158k, VIN = 6V | 3 |
| Switching Frequency | | 156 | 195 | 234 | kHz | RT = 768k, VIN = 6V | 3 |
| Switch Current Limit | | 1.237 | 1.65 | 1.98 | A | VIN = 5V, VFB = 0V, l | 3 |
| Catch Schottky Current Limit | | 0.92 | 1.15 | 1.44 | A | VIN = 5V, l | 3 |
| Switch Leakage Current | | | 0.05 | 2 | µA | | 3 |
| Catch Schottky Reverse Leakage | | | 0.05 | 2 | µA | VSW = 12V | 3 |
| Boost Schottky Reverse Leakage | | | 0.02 | 2 | µA | VREVERSE = 12V | 3 |
| Minimum Boost Voltage (Note 4) | | 1.4 | | 1.8 | V | VIN = 5V, l | 3 |
| BOOST Pin Current | | | 10 | 13 | mA | ISW = 500mA, VBOOST = 15V | 3 |
| Dropout Comparator Threshold (VIN - OUT) | | 400 | 490 | 580 | mV | Falling, VIN = 5V, l | 3 |
| EN/UVLO Pin Current | | | 1 | 30 | nA | VEN/UVLO = 12V | 4 |
| EN/UVLO Voltage Threshold (falling) | | 1.09 | 1.16 | 1.23 | V | EN/UVLO Falling, VIN ≥ 4.2V, l | 4 |
| EN/UVLO Voltage Threshold (rising) | | 1.12 | 1.19 | 1.28 | V | EN/UVLO Rising, VIN ≥ 4.2V, l | 4 |
| EN/UVLO Voltage Hysteresis | | | 30 | 45 | mV | | 4 |
| PG Threshold Offset from Feedback Voltage | | 6.5 | 10 | 13.5 | % | VFB Rising | 4 |
| PG Leakage | | | 0.01 | 1 | µA | VPG = 3V | 4 |
| PG Sink Current | | 220 | | 350 | µA | VPG = 0.4V, l | 4 |
| Minimum Switch Off-Time (Note 5) | | | 130 | 180 | ns | VIN = 10V | 4 |
| Thermal Resistance, Junction to Ambient | θJA | | 45 | | °C/W | MSE package (10-lead MSOP, exposed pad) | 2 |
| Thermal Resistance, Junction to Case | θJC | | 10 | | °C/W | MSE package (10-lead MSOP, exposed pad) | 2 |
## Materials and finish
As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| housing | ABS | | LT3973HMSE-5#PBF LT3973HMSE-5#TRPBF LTGGD 10-Lead Plastic MSOP -40°C to 150°C ABSOLUTE MAXIMUM RATINGS | 2 |
## CAD (KiCad official)
- Symbol: `LT3973EMSE-3.3#PBF`
- Footprint: `Package_SO:MSOP-10-1EP_3x3mm_P0.5mm_EP1.68x1.88mm`
- 3D model: MSOP-10-EP (KiCad packages3D, STEP)
- 3D model files: `lt3973emse-3-3-pbf-etched.step` / `lt3973emse-3-3-pbf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lt3973emse-3-3-pbf.step` / `lt3973emse-3-3-pbf.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Analog Devices datasheet](https://www.analog.com/media/en/technical-documentation/data-sheets/3973fb.pdf) (24 pp, sha256 `8b84083bfbac6278`, retrieved 2026-10-30, tier: manufacturer)
- **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](docs/lt3973emse-3-3-pbf-datasheet.pdf)