component
LT3991EMSE-5#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.
Generated by kicad-footprint-generator · KiCad file format 20260206
| Name | Last updated |
|---|---|
| docs | 11d ago |
| viewers | 11d ago |
| lt3991emse-5-pbf-etched.glb | 11d ago |
| lt3991emse-5-pbf-etched.step | 11d ago |
| lt3991emse-5-pbf-hero.glb | 11d ago |
| lt3991emse-5-pbf-hero.overlay.json | 11d ago |
| lt3991emse-5-pbf.glb | 11d ago |
| lt3991emse-5-pbf.kicad_mod | 11d ago |
| lt3991emse-5-pbf.kicad_sym | 11d ago |
| lt3991emse-5-pbf.lbr | 11d ago |
| lt3991emse-5-pbf.step | 11d ago |
| package.json | 11d ago |
| page.json | 11d ago |
| README.md | 11d ago |
LT3991EMSE-5#PBF
Analog Devices · DC-DC Converters · MSOP-10-EP
LT3991EMSE-5#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 | BD | passive | Connects to the anode of the boost Schottky diode and is normally connected to the output. |
| 2 | BOOST | power_in | Provides a drive voltage higher than the input voltage to the internal NPN power switch, supplied through an external boost capacitor. |
| 3 | SW | output | Output of the internal power switch; connects to the inductor, catch diode and boost capacitor. |
| 4 | VIN | power_in | Supplies current to the internal circuitry and power switch over the 4.3V to 55V input range and must be locally bypassed. |
| 5 | EN | input | Shutdown when low and active when high, with 1.005V rising and 0.975V falling thresholds; the threshold is only accurate when VIN is above 4.3V. |
| 6 | VOUT | input | On the LT3991-5 this pin regulates the output to 5V and connects to the internal 10MΩ feedback divider that programs the fixed output voltage. |
| 7 | SS | passive | A capacitor and series resistor to ground slowly ramp the peak current limit on start-up; the typical soft-start resistor is 100k, and floating the pin disables soft-start. |
| 8 | RT | passive | A resistor tied between RT and ground sets the switching frequency. |
| 9 | PG | output | Open-drain power good output that remains low until the FB pin is within 9% of the final regulation voltage and is valid when the part is enabled and VIN is above 4.3V. |
| 10 | SYNC | input | External clock synchronization input; grounding it gives low-ripple Burst Mode operation at low output loads, while a clock source synchronizes the switching frequency with pulse-skipping at low loads. |
| 11 | GND | power_in | Ground; the exposed pad must be soldered to the PCB. |
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 |
|---|---|---|---|---|---|---|---|
| LT3991-5 Output Voltage | VOUT | 4.93 | 5 | 5.07 | V | 3 | |
| LT3991-5 Output Voltage (full temperature range) | VOUT | 4.89 | 5 | 5.11 | V | l: full operating junction temperature range | 3 |
| Quiescent Current from VIN | IQ | 0.7 | 1.2 | μA | VEN Low | 3 | |
| Quiescent Current from VIN | IQ | 1.7 | 2.7 | μA | VEN High, VSYNC Low | 3 | |
| Quiescent Current from VIN | IQ | 4.5 | μA | VEN High, VSYNC Low, l: full operating temperature range | 3 | ||
| Minimum Input Voltage | 4.3 | V | Note 4: depends on application circuit | 3 | |||
| Switching Frequency | fSW | 1.6 | 2 | 2.4 | MHz | RT = 11k | 3 |
| Switching Frequency | fSW | 0.8 | 1 | 1.2 | MHz | RT = 35.7k | 3 |
| Switching Frequency | fSW | 160 | 200 | 240 | kHz | RT = 255k | 3 |
| Minimum Switch On Time | tON(MIN) | 110 | ns | 3 | |||
| Minimum Switch Off Time | tOFF(MIN) | 150 | 200 | ns | 3 | ||
| Switch Current Limit | ILIM | 1.7 | 2.3 | 2.9 | A | 3 | |
| Switch VCESAT | VCESAT | 440 | mV | ISW = 1A | 3 | ||
| Switch Leakage Current | 0.02 | 1 | μA | 3 | |||
| Boost Schottky Forward Voltage | VF | 800 | mV | ISH = 100mA | 3 | ||
| Boost Schottky Reverse Leakage | IR | 0.02 | 1 | μA | VREVERSE = 12V | 3 | |
| Minimum Boost Voltage | 1.4 | 1.8 | V | VIN = 5V, l: full operating temperature range | 3 | ||
| BOOST Pin Current | 25 | 33 | mA | ISW = 1A, VBOOST = 15V | 3 | ||
| EN Voltage Threshold | 0.95 | 1.01 | 1.07 | V | EN Rising, l: full operating temperature range | 3 | |
| EN Voltage Hysteresis | 30 | mV | 3 | ||||
| EN Pin Current | 0.2 | 20 | nA | 3 | |||
| LT3991-X PG Threshold Offset from VOUT | 5.5 | 9 | 12.5 | % | VOUT Rising | 3 | |
| LT3991X PG Hysteresis | 1.3 | % | 3 | ||||
| PG Leakage | 0.02 | 1 | µA | VPG = 3V | 3 | ||
| PG Sink Current | 300 | 570 | μA | VPG = 0.4V, l: full operating temperature range | 3 | ||
| SYNC Threshold | 0.6 | 0.8 | 1 | V | 3 | ||
| SYNC Pin Current | 0.1 | nA | 3 | ||||
| SS Source Current | 0.6 | 1 | 1.6 | μA | VSS = 1V | 3 | |
| BOOST Pin Above SW Pin | 30 | V | 2 | ||||
| FB, VOUT, RT, SYNC, SS Voltage | 6 | V | 2 | ||||
| PG, BD Voltage | 30 | V | 2 | ||||
| Boost Diode Current | 1 | A | 2 | ||||
| Operating Junction Temperature Range (LT3991E) | TJ | -40 | 125 | °C | 2 | ||
| Storage Temperature Range | TSTG | -65 | 150 | °C | 2 | ||
| Lead Temperature (Soldering, 10 sec) (MSE Only) | 300 | °C | 10 sec soldering, MSE package | 2 | |||
| Thermal Resistance, Junction-to-Ambient | θJA | 45 | °C/W | 2 | |||
| Thermal Resistance, Junction-to-Case | θJC | 10 | °C/W | 2 |
CAD (KiCad official)
- Symbol:
LT3991EMSE-5#PBF - Footprint:
Package_SO:MSOP-10-1EP_3x3mm_P0.5mm_EP1.68x1.88mm - 3D model: MSOP-10-EP (KiCad packages3D, STEP)
- 3D model files:
lt3991emse-5-pbf-etched.step/lt3991emse-5-pbf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lt3991emse-5-pbf.step/lt3991emse-5-pbf.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Analog Devices datasheet (24 pp, sha256
05394db5ad4d382a, retrieved 2026-10-28, 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).