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LTC1871IMS#TRPBF
Public Made by Adomby adom
Analog Devices DC-DC Controllers, MSOP-10. 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
markdownLTC1871IMS#TRPBF
Analog Devices · DC-DC Controllers · MSOP-10
LTC1871IMS#TRPBF from Analog Devices, in a MSOP-10. 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 | RUN | input | The falling RUN threshold is nominally 1.248V with 100mV of hysteresis, and the absolute maximum voltage on this pin is 7V. |
| 2 | ITH | passive | This is the error amplifier compensation pin, with a nominal voltage range of 0V to 1.40V that sets the current comparator threshold. |
| 3 | FB | input | This pin receives the feedback voltage from the external output divider, with a nominal regulated voltage of 1.230V. |
| 4 | FREQ | input | A resistor from this pin to ground programs the operating frequency over 50kHz to 1000kHz, with a nominal pin voltage of 0.6V and an absolute maximum of 1.5V. |
| 5 | MODE/SYNC | input | Connecting this pin to ground enables Burst Mode operation, while connecting it to INTVCC or applying an external logic-level clock above 2V disables Burst Mode and selects continuous operation, with the pin pulled low internally by a 50k resistor when left open. |
| 6 | GND | power_in | This is the ground pin for the controller. |
| 7 | GATE | output | This is the gate driver output for the external N-channel power MOSFET, with a voltage limited to VINTVCC + 0.3V. |
| 8 | INTVCC | power_out | This is the internal 5.20V regulator output that powers the gate driver and control circuits, must be decoupled to ground with a minimum of 4.7µF, and is limited to 50mA of output current. |
| 9 | VIN | power_in | This is the main supply pin with a wide input range of 2.5V to 36V and an absolute maximum of 36V, and it must be closely decoupled to ground. |
| 10 | SENSE | input | This is the current sense input, connected to the power MOSFET drain for VDS sensing or to a source resistor, with an absolute maximum pin voltage of 36V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | MSOP-10 |
| Category | Power Management ICs |
| Pins | 10 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Operating Temperature Range (I-grade) | -40 | 125 | °C | LTC1871I | 2 | ||
| Minimum Input Voltage | VIN(MIN) | 2.5 | V | I-Grade or H-Grade (Note 2) | 3 | ||
| Input Supply Current, Continuous Mode | IQ | 550 | 1000 | μA | VMODE/SYNC = 5V, VFB = 1.4V, VITH = 0.75V, I-Grade or H-Grade | 3 | |
| Input Supply Current, Burst Mode No Load | IQ | 250 | 500 | μA | VMODE/SYNC = 0V, VITH = 0.2V (Note 5), I-Grade or H-Grade | 3 | |
| Input Supply Current, Shutdown | IQ | 10 | 20 | μA | VRUN = 0V, I-Grade or H-Grade | 3 | |
| Falling RUN Input Threshold Voltage | VRUN- | 1.198 | 1.248 | 1.298 | V | full temperature range | 3 |
| Rising RUN Input Threshold Voltage | VRUN+ | 1.348 | V | 3 | |||
| RUN Pin Input Threshold Hysteresis | VRUN(HYST) | 35 | 100 | 175 | mV | I-Grade (Note 2) | 3 |
| RUN Input Current | IRUN | 1 | 60 | nA | 3 | ||
| Feedback Voltage | VFB | 1.205 | 1.23 | 1.255 | V | VITH = 0.2V (Note 5), I-Grade or H-Grade | 3 |
| FB Pin Input Current | IFB | 18 | 60 | nA | VITH = 0.2V (Note 5) | 3 | |
| Line Regulation | ΔVFB/ΔVIN | 0.002 | 0.02 | %/V | 2.5V ≤ VIN ≤ 30V, I-Grade or H-Grade | 3 | |
| Load Regulation | ΔVFB/ΔVITH | -0.1 | -1 | % | VMODE/SYNC = 0V, VITH = 0.5V to 0.9V (Note 5), I-Grade or H-Grade | 3 | |
| FB Pin Overvoltage Lockout | ΔVFB(OV) | 2.5 | 6 | 10 | % | VFB(OV), VFB(NOM) in Percent | 3 |
| Error Amplifier Transconductance | gm | 650 | μmho | ITH Pin Load = ±5μA (Note 5) | 3 | ||
| Burst Mode Operation ITH Voltage | VITH(BURST) | 0.3 | V | Falling ITH Voltage (Note 5) | 3 | ||
| Maximum Current Sense Input Threshold | VSENSE(MAX) | 100 | 150 | 200 | mV | Duty Cycle < 20%, I-Grade or H-Grade | 3 |
| SENSE Pin Current (GATE High) | ISENSE(ON) | 35 | 50 | μA | VSENSE = 0V | 3 | |
| SENSE Pin Current (GATE Low) | ISENSE(OFF) | 0.1 | 5 | μA | VSENSE = 30V | 3 | |
| Oscillator Frequency | fOSC | 250 | 300 | 350 | kHz | RFREQ = 80k, I-Grade (Note 2) | 3 |
| Oscillator Frequency Range | 50 | 1000 | kHz | I-Grade or H-Grade (Note 2) | 3 | ||
| Maximum Duty Cycle | DMAX | 87 | 92 | 97 | % | I-Grade or H-Grade | 4 |
| Recommended Maximum Synchronized Frequency Ratio | fSYNC/fOSC | 1.25 | 1.3 | fOSC = 300kHz (Note 6), I-Grade or H-Grade | 4 | ||
| MODE/SYNC Minimum Input Pulse Width | tSYNC(MIN) | 25 | ns | VSYNC = 0V to 5V | 4 | ||
| Low Level MODE/SYNC Input Voltage | VIL(MODE) | 0.3 | V | I-Grade or H-Grade (Note 2) | 4 | ||
| High Level MODE/SYNC Input Voltage | VIH(MODE) | 1.2 | V | I-Grade or H-Grade (Note 2) | 4 | ||
| MODE/SYNC Input Pull-Down Resistance | RMODE/SYNC | 50 | kΩ | 4 | |||
| Nominal FREQ Pin Voltage | VFREQ | 0.62 | V | 4 | |||
| INTVCC Regulator Output Voltage | VINTVCC | 5 | 5.2 | 5.4 | V | VIN = 7.5V, I-Grade (Note 2) | 4 |
| INTVCC Regulator Line Regulation | ΔVINTVCC/ΔVIN1 | 8 | 25 | mV | 7.5V ≤ VIN ≤ 15V | 4 | |
| INTVCC Regulator Line Regulation | ΔVINTVCC/ΔVIN2 | 70 | 200 | mV | 15V ≤ VIN ≤ 30V | 4 | |
| INTVCC Load Regulation | VLDO(LOAD) | -0.2 | -2 | % | 0 ≤ IINTVCC ≤ 20mA, VIN = 7.5V | 4 | |
| INTVCC Regulator Dropout Voltage | VDROPOUT | 280 | mV | VIN = 5V, INTVCC Load = 20mA | 4 | ||
| Bootstrap Mode INTVCC Supply Current in Shutdown | IINTVCC | 10 | 30 | μA | RUN = 0V, SENSE = 5V, I-Grade (Note 2) | 4 | |
| GATE Driver Output Rise Time | tr | 17 | 100 | ns | CL = 3300pF (Note 7) | 4 | |
| GATE Driver Output Fall Time | tf | 8 | 100 | ns | CL = 3300pF (Note 7) | 4 | |
| VIN Voltage | VIN | -0.3 | 36 | V | 2 | ||
| INTVCC Voltage | INTVCC | -0.3 | 7 | V | 2 | ||
| INTVCC Output Current | 50 | mA | 2 | ||||
| GATE Voltage | -0.3 | V | upper limit VINTVCC + 0.3V | 2 | |||
| ITH, FB Voltages | -0.3 | 2.7 | V | 2 | |||
| RUN, MODE/SYNC Voltages | -0.3 | 7 | V | 2 | |||
| FREQ Voltage | -0.3 | 1.5 | V | 2 | |||
| SENSE Pin Voltage | -0.3 | 36 | V | 2 | |||
| Junction Temperature | TJ | 125 | °C | LTC1871E/LTC1871I | 2 | ||
| Storage Temperature Range | -65 | 150 | °C | 2 | |||
| Lead Temperature (Soldering, 10 sec) | 300 | °C | 2 | ||||
| Thermal Resistance Junction-to-Ambient | θJA | 120 | °C/W | 10-lead MSOP | 2 |
CAD (KiCad official)
- Symbol:
LTC1871IMS#TRPBF - Footprint:
Package_SO:MSOP-10_3x3mm_P0.5mm - 3D model: MSOP-10 (KiCad packages3D, STEP)
- 3D model files:
ltc1871ims-trpbf-etched.step/ltc1871ims-trpbf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ltc1871ims-trpbf.step/ltc1871ims-trpbf.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Analog Devices datasheet (36 pp, sha256
5b84261840bec987, retrieved 2026-10-31, 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).