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LTC4218IGN#TRPBF
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Analog Devices Surge Protection Devices (SPDs), SSOP-16-150mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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LTC4218IGN#TRPBF
Analog Devices · Surge Protection Devices (SPDs) · SSOP-16-150mil
LTC4218IGN#TRPBF from Analog Devices, in a SSOP-16-150mil. 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 | SENSE+ | input | Current sense plus input, connected to the VDD side of the current sense resistor; the current limit holds the SENSE+ to SENSE- voltage to 15mV or less depending on the FB voltage. |
| 2 | SENSE- | input | Current sense minus input, connected to the side of the current sense resistor opposite VDD; the current limit holds the SENSE+ to SENSE- voltage to 15mV or less depending on the FB voltage. |
| 3 | ISET | passive | Current limit adjustment pin; leave open for the 15mV threshold, keep any RSET resistor no less than 2kΩ due to circuit tolerance, and place a 0.1µF capacitor to ground when a board trace connects to this pin. |
| 4 | IMON | output | Current monitor output that sources 6.67µA/mV of sense voltage, giving a 0V to 2V swing with a 20kΩ resistor to GND for a 0mV to 15mV sense voltage, with compliance from 0V to INTVCC - 0.7V. |
| 5 | FB | input | Foldback and power good comparator input; below 0.6V the current limit is reduced, and below 1.21V the PG pin pulls low on the adjustable LTC4218. |
| 6 | FLT | output | Open-drain overcurrent fault indicator that pulls low when the circuit breaker trips, and is tied to UV for overcurrent auto-retry. |
| 7 | PG | output | Open-drain power good indicator that pulls low when FB falls below 1.21V and releases high once FB rises above 1.23V and GATE-to-SOURCE exceeds 4.2V. |
| 8 | GATE | output | Gate drive for the external N-channel MOSFET, charged by a 24µA current source, pulled down by 250µA during UV/OV turn-off and by 170mA during a short circuit or undervoltage lockout. |
| 9 | SOURCE | passive | N-channel MOSFET source connection, which connects to the source of the external MOSFET and provides the return for the gate pull-down circuit. |
| 10 | GND | power_in | Device ground. |
| 11 | INTVCC | power_out | Internal 3.1V supply decoupling output that requires a 1µF or larger capacitor, and overloading this pin can disrupt internal operation. |
| 12 | TIMER | passive | Timer input; a capacitor to ground sets a 12ms/µF current-limit duration before the switch turns off, with a 1.2V high threshold and 0.2V low threshold. |
| 13 | OV | input | Overvoltage comparator input; if the voltage rises above 1.235V the switch turns off, and the pin must be tied to GND if unused. |
| 14 | UV | input | Undervoltage comparator input; the switch turns off when the voltage falls below 1.15V, pulling it below 0.62V resets an overcurrent fault, and it must be tied high if unused. |
| 15 | VDD | power_in | Supply voltage input with an operating range of 2.9V to 26.5V and an undervoltage lockout threshold of 2.73V. |
| 16 | NC | unconnected | No connection. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | SSOP-16-150mil |
| Category | Circuit Protection |
| Pins | 16 |
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 Supply Range | VDD | 2.9 | 26.5 | V | 3 | ||
| Input Supply Undervoltage Lockout | VDD(UVL) | 2.65 | 2.73 | 2.85 | V | VDD Rising | 3 |
| Current Limit Sense Voltage Threshold (VSENSE+, VSENSE-) | ΔVSNS(TH) | 14.25 | 15 | 15.75 | mV | VFB = 1.23V | 3 |
| Current Limit Sense Voltage Threshold (VSENSE+, VSENSE-) | ΔVSNS(TH) | 2.8 | 3.75 | 4.7 | mV | VFB = 0V | 3 |
| Current Limit Sense Voltage Threshold (VSENSE+, VSENSE-) | ΔVSNS(TH) | 6.7 | 7.5 | 8.325 | mV | VFB = 1.23V, RSET = 20kΩ | 3 |
| SENSE- Input Current | ISENSE-(IN) | -10 | 4 | 10 | µA | VSENSE- = 12V | 3 |
| SENSE+ Input Current | ISENSE+(IN) | -20 | 5.5 | 20 | µA | VSENSE+ = 12V | 3 |
| External N-Channel Gate Drive (VGATE, VSOURCE) | ΔVGATE | 5 | 6.15 | 6.5 | V | VDD = 2.9V to 26.5V (Note 3), IGATE = 0, -1µA | 3 |
| Gate High Threshold (VGATE, VSOURCE) | ΔVGATE-HIGH(TH) | 3.5 | 4.2 | 4.8 | V | 3 | |
| External N-Channel Gate Pull-Up Current | IGATE(UP) | -29 | -24 | -19 | µA | Gate Drive On, VGATE = VSOURCE = 12V | 3 |
| External N-Channel Gate Fast Pull-Down Current | IGATE(FST) | 100 | 170 | 220 | mA | Fast Turn Off, VGATE = 18V, VSOURCE = 12V | 3 |
| External N-Channel Gate Pull-Down Current | IGATE(DN) | 200 | 250 | 400 | µA | Gate Drive Off, VGATE = 18V, VSOURCE = 12V | 3 |
| OV, UV, FB Input Current | IIN | -1 | 0 | 1 | µA | VPIN = 1.2V, LTC4218 Only | 3 |
| OV, UV, FB Threshold Voltage | V(TH) | 1.21 | 1.235 | 1.26 | V | VPIN Rising | 3 |
| OV Hysteresis | ΔVOV(HYST) | 10 | 20 | 30 | mV | 3 | |
| UV Hysteresis | ΔVUV(HYST) | 50 | 80 | 110 | mV | 3 | |
| UV Reset Threshold Voltage | VUV(RTH) | 0.55 | 0.62 | 0.7 | V | VUV Falling | 3 |
| FB Power Good Hysteresis | ΔVFB(HYST) | 10 | 20 | 30 | mV | 3 | |
| ISET Internal Resistor | RISET | 19.5 | 20 | 20.5 | kΩ | 3 | |
| SOURCE Input Current | ISOURCE | 1 | 2 | 4 | µA | VSOURCE = VGATE = 12V, LTC4218 Only | 3 |
| SOURCE Input Current | ISOURCE | -1 | 0 | 1 | µA | VSOURCE = VGATE = 0V | 3 |
| TIMER High Threshold | VTIMER(H) | 1.2 | 1.235 | 1.28 | V | VTIMER Rising | 3 |
| TIMER Low Threshold | VTIMER(L) | 0.1 | 0.21 | 0.3 | V | VTIMER Falling | 3 |
| TIMER Pull Up Current | ITIMER(UP) | -120 | -100 | -80 | µA | VTIMER = 0V | 3 |
| TIMER Pull-Down Current | ITIMER(DN) | 1.4 | 2 | 2.6 | µA | VTIMER = 1.2V | 3 |
| TIMER Current Ratio | ITIMER(RATIO) | 1.6 | 2 | 2.7 | % | ITIMER(DN)/ITIMER(UP) | 4 |
| IMON Full-Scale Output Current | IMON(FS) | 94 | 100 | 106 | µA | VSENSE+, VSENSE- = 15mV | 4 |
| IMON Offset Current | IMON(OFF) | -6 | 0 | 6 | µA | VSENSE+, VSENSE- = 1mV | 4 |
| IMON Gain | GIMON | 6.47 | 6.67 | 6.87 | µA/mV | VSENSE+, VSENSE- = 15mV and 1mV | 4 |
| PG, FLT Output Low Voltage | VOL | 0.4 | 0.8 | V | ISINK = 2mA | 3 | |
| PG, FLT Input Leakage Current | IOH | -10 | 0 | 10 | µA | V = 30V | 3 |
| Input Supply Current | IDD | 1.6 | 5 | mA | FET On | 3 | |
| Input High (OV), Input Low (UV) to GATE Low Propagation Delay | tPHL(GATE) | 3 | 5 | µs | VGATE < 16.5V Falling | 4 | |
| VSENSE+, VSENSE- High to GATE Low Propagation Delay | tPHL(SENSE) | 0.2 | 1 | µs | VFB = 0, Step (VSENSE+, VSENSE-) to 60mV, CGATE = 1.5nF, VGATE < 16.5V Falling | 4 | |
| Turn-On Delay | tD(ON) | 50 | 100 | 150 | ms | Step VUV to 2V, VGATE > 13V | 4 |
| Supply Voltage | VDD | -0.3 | 35 | V | 2 | ||
| Input Voltages FB, OV, UV | VFB, VOV, VUV | -0.3 | 12 | V | 2 | ||
| Input Voltage TIMER | VTIMER | -0.3 | 3.5 | V | 2 | ||
| Input Voltage SOURCE | VSOURCE | -5 | V | Upper limit printed as VDD + 0.3V | 2 | ||
| Output Voltages ISET, IMON | VISET, VIMON | -0.3 | 3 | V | 2 | ||
| Output Voltages PG, FLT | VPG, VFLT | -0.3 | 35 | V | 2 | ||
| Output Voltage INTVCC | VINTVCC | -0.3 | 3.5 | V | 2 | ||
| Output Voltage GATE | VGATE | -0.3 | 35 | V | Note 3 | 2 | |
| Operating Ambient Temperature Range (LTC4218I) | TA | -40 | 85 | °C | 2 | ||
| Storage Temperature Range | TSTG | -65 | 150 | °C | 2 | ||
| Maximum Junction Temperature | TJMAX | 150 | °C | GN package | 2 | ||
| VINTVCC INTVCC Output Voltage | VINTVCC | 3.1 | V | ISINK = 0mA, -10mA | 3 | ||
| Bandwidth IMON | BWIMON | 250 | kHz | 4 | |||
| Fault Latch Clear Delay (UV Low to Clear Fault Latch) | tD(FAULT) | 1 | µs | 4 | |||
| Thermal Resistance Junction-to-Ambient | θJA | 135 | °C/W | GN package | 2 |
CAD (KiCad official)
- Symbol:
LTC4218IGN#TRPBF - Footprint:
Package_SO:SSOP-16_5.3x6.2mm_P0.65mm - 3D model: SSOP-16-150mil (KiCad packages3D, STEP)
- 3D model files:
ltc4218ign-trpbf-etched.step/ltc4218ign-trpbf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ltc4218ign-trpbf.step/ltc4218ign-trpbf.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Analog Devices datasheet (18 pp, sha256
427d5758f9234b2a, 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).