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LT3991EMSE#TRPBF
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Analog Devices DC-DC Converters, MSOP-10-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
markdownLT3991EMSE#TRPBF
Analog Devices · DC-DC Converters · MSOP-10-EP
LT3991EMSE#TRPBF 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; the datasheet limits BD voltage to 30V and boost diode current to 1A. |
| 2 | BOOST | power_in | Provides a drive voltage higher than the input to the internal bipolar NPN power switch; BOOST pin voltage is limited to 75V and BOOST pin voltage above SW is limited to 30V. |
| 3 | SW | output | Output of the internal power switch that connects to the inductor, catch diode and boost capacitor. |
| 4 | VIN | power_in | Supplies the internal circuitry and internal power switch over an input range of 4.3V to 55V and must be locally bypassed. |
| 5 | EN | input | Enable input: the part is shut down when low and active when high, with a 1.005V rising and 0.975V falling threshold that is accurate only when VIN is above 4.3V; tie to VIN if shutdown is not used. |
| 6 | FB | input | LT3991 only: the part regulates this pin to 1.19V, so it connects to the feedback divider tap, with a typical 10pF phase lead capacitor from FB to VOUT. |
| 7 | SS | passive | Soft-start pin where a capacitor and series resistor (typically 100k) are tied to ground to ramp the peak current limit at start-up; float this pin to disable soft-start and the absolute maximum rating is 6V. |
| 8 | RT | passive | A resistor from this pin to ground sets the switching frequency (200kHz to 2MHz range per the features list). |
| 9 | PG | output | Open-drain power good output that stays low until FB is within 9% of the regulation voltage, is valid only when enabled and VIN is above 4.3V, and is rated to 30V. |
| 10 | SYNC | input | External clock synchronization input: ground for low-ripple Burst Mode operation at low loads, or drive with a clock source to synchronize (pulse-skipping at low loads raises quiescent current to 1.5mA); absolute maximum is 6V. |
| 11 | GND | power_in | Ground exposed pad that must be soldered to the PCB. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | MSOP-10-EP |
| Category | Power Management (PMIC) |
| 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 |
|---|---|---|---|---|---|---|---|
| Minimum Input Voltage (Note 4) | 4 | 4.3 | V | Note 4: depends on application circuit | 3 | ||
| Quiescent Current from VIN | 0.7 | 1.2 | µA | VEN Low | 3 | ||
| Quiescent Current from VIN | 1.7 | 2.7 | µA | VEN High, VSYNC Low | 3 | ||
| Quiescent Current from VIN | 4.5 | µA | VEN High, VSYNC Low, full operating temperature range (l) | 3 | |||
| LT3991 FB Pin Current | 0.1 | 12 | nA | VFB = 1.19V, full operating temperature range (l) | 3 | ||
| Feedback Voltage | 1.175 | 1.19 | 1.205 | V | full operating temperature range (l) | 3 | |
| Feedback Voltage | 1.165 | 1.19 | 1.215 | V | full operating temperature range (l) | 3 | |
| FB Voltage Line Regulation | 0.0002 | 0.01 | %/V | 4.3V < VIN < 40V (Note 4) | 3 | ||
| Switching Frequency | 1.6 | 2 | 2.4 | MHz | RT = 11k | 3 | |
| Switching Frequency | 0.8 | 1 | 1.2 | MHz | RT = 35.7k | 3 | |
| Switching Frequency | 160 | 200 | 240 | kHz | RT = 255k | 3 | |
| Minimum Switch On Time | 110 | ns | 3 | ||||
| Minimum Switch Off Time | 150 | 200 | ns | 3 | |||
| Switch Current Limit | 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 | 800 | mV | ISH = 100mA | 3 | |||
| Boost Schottky Reverse Leakage | 0.02 | 1 | µA | VREVERSE = 12V | 3 | ||
| Minimum Boost Voltage (Note 3) | 1.4 | 1.8 | V | VIN = 5V, full operating temperature range (l) | 3 | ||
| BOOST Pin Current | 25 | 33 | mA | ISW = 1A, VBOOST = 15V | 3 | ||
| EN Voltage Threshold | 0.95 | 1.01 | 1.07 | V | EN Rising, full operating temperature range (l) | 3 | |
| EN Voltage Hysteresis | 30 | mV | 3 | ||||
| EN Pin Current | 0.2 | 20 | nA | 3 | |||
| LT3991 PG Threshold Offset from VFB | 60 | 100 | 140 | mV | VFB Rising | 3 | |
| LT3991 PG Hysteresis | 20 | mV | 3 | ||||
| PG Leakage | 0.02 | 1 | µA | VPG = 3V | 3 | ||
| PG Sink Current | 300 | 570 | µA | VPG = 0.4V, full operating temperature range (l) | 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 | Note 1 | 2 | |||
| Lead Temperature (Soldering) | 300 | °C | 10 sec, MSE package only | 2 | |||
| Storage Temperature Range | -65 | 150 | °C | 2 | |||
| Operating Junction Temperature Range (LT3991E) | TJ | -40 | 125 | °C | LT3991E, Note 2 | 2 | |
| Input Voltage Range | VIN | 4.3 | 55 | V | Feature statement (wide input voltage range) | 1 | |
| Output Voltage Range | VOUT | 1.19 | 30 | V | Feature statement | 1 | |
| Junction-to-Ambient Thermal Resistance | θJA | 45 | °C | MSE (10-lead MSOP) package, as printed | 2 | ||
| Junction-to-Case Thermal Resistance | θJC | 10 | °C/W | MSE (10-lead MSOP) package | 2 |
CAD (KiCad official)
- Symbol:
LT3991EMSE#TRPBF - Footprint:
Package_SO:MSOP-10-1EP_3x3mm_P0.5mm_EP1.68x1.88mm - 3D model: MSOP-10-EP (KiCad packages3D, STEP)
- 3D model files:
lt3991emse-trpbf-etched.step/lt3991emse-trpbf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lt3991emse-trpbf.step/lt3991emse-trpbf.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 2026-10-18, 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).