# LTC4380IDD-2#TRPBF

**Analog Devices** · Surge Protection Devices (SPDs) · DFN-10-EP(3x3)

LTC4380IDD-2#TRPBF from Analog Devices, in a DFN-10-EP(3x3). 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 | DRN | input | External MOSFET drain-source sense; DRN tracks OUT, RDRN should limit the DRN pin current to 1mA at the peak input voltage, and it should connect to OUT if unused. |
| 2 | VCC | power_in | Positive supply input with 4V to 80V normal operating range; it can go up to 60V below ground in reverse battery conditions without damaging the part. |
| 3 | GATE | output | Gate drive for the external N-channel MOSFET, pulled up by a 20µA charge pump regulated to 11.5V above OUT, requiring a minimum of 47nF and a 33Ω series resistor at the pin. |
| 4 | SNS | input | Current sense input connected to the input terminal of the sense resistor, limiting the sense voltage to 50mV (62mV in severe faults), with ΔVSNS (SNS - OUT) limited to less than ±5V. |
| 5 | OUT | input | Output voltage sense at the output terminal of the current sense resistor, which must be bypassed with a minimum of 22µF as close to the pin as possible. |
| 6 | SEL | input | Gate clamp voltage select for LTC4380-1/LTC4380-2, where connecting to GND sets the gate clamp to 31.5V and connecting to VCC or OUT sets it to 50V; it can be pulled up to 80V or below GND by 60V without damage. |
| 7 | FLT | output | Open-drain fault output that pulls low when TMR reaches the 1.215V fault threshold, capable of sinking up to 3mA, and should be left open or tied to GND if unused. |
| 8 | GND | power_in | Device ground. |
| 9 | ON | input | Turn-on control input that turns the part on above 1.05V or when left open via an internal 1MΩ resistor, and shuts it down (6µA supply current) when pulled below threshold; it can be pulled up to 80V or below GND by 60V without damage. |
| 10 | TMR | passive | Fault timer input where a capacitor to ground sets the fault turn-off and cool-down time, with the MOSFET turning off when TMR reaches 1.215V; a 10V rated X7R capacitor is recommended. |
| 11 | GND | power_in | Exposed pad, which may be left open or connected to device ground (GND). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | DFN-10-EP(3x3) |
| Category | Circuit Protection |
| 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 |
|---|---|---|---|---|---|---|---|
| VCC, ON, SEL pin voltage | VCC, ON, SEL | -60 |  | 80 | V |  | 2 |
| DRN, SNS, OUT pin voltage (LTC4380-1/LTC4380-2) | DRN, SNS, OUT | -0.3 |  | 53 | V | LTC4380-1/LTC4380-2 | 2 |
| SNS to OUT voltage | SNS-OUT | -5 |  | 5 | V |  | 2 |
| GATE pin voltage (LTC4380-1/LTC4380-2) | GATE | -0.3 |  | 53 | V | LTC4380-1/LTC4380-2 | 2 |
| GATE to OUT, GATE to VCC voltage | GATE-OUT, GATE-VCC | -0.3 |  | 10 | V |  | 2 |
| TMR pin voltage | TMR | -0.3 |  | 5 | V |  | 2 |
| FLT pin voltage | FLT | -0.3 |  | 80 | V |  | 2 |
| Storage temperature range |  | -65 |  | 150 | °C |  | 2 |
| Maximum junction temperature (DD package) | TJMAX |  |  | 135 | °C | DD package (10-lead 3mm x 3mm DFN) | 2 |
| Operating ambient temperature range (LTC4380I) | TA | -40 |  | 85 | °C | LTC4380I | 2 |
| VCC Operating Voltage Range | VCC | 4 |  | 80 | V | LTC4380-1/LTC4380-2 | 4 |
| VOUT Operating Voltage Range | VOUT |  |  | 72 | V |  | 4 |
| IQ Total Supply Current | IQ |  | 8 | 11 | µA | C-Grade and I-Grade (Note 5) | 4 |
| IQ Total Supply Current | IQ |  | 22 | 28 | µA | VCC = OUT = SNS = DRN = 4V; C-Grade and I-Grade | 4 |
| VCC Current, Shutdown | ICC |  | 6 | 10 | µA | ON = OUT = SNS = 0V | 4 |
| VCC Current |  |  | 7 | 9 | µA |  | 4 |
| VCC Current |  |  | 20 | 25 | µA | VCC = OUT = SNS = DRN = 4V | 4 |
| SNS Current | ISNS |  | 0.5 | 1.4 | µA |  | 4 |
| OUT Current | IOUT |  | 1.5 | 5 | µA |  | 4 |
| OUT Current, Shutdown | IOUT |  | 5.5 | 12 | µA | Shutdown; C-Grade and I-Grade | 4 |
| Reverse Input Current | IR |  | -0.4 | -2 | mA | VCC = -60V, ON Open, SEL = 0V | 4 |
| Reverse Input Current | IR |  | -1.2 | -5 | mA | VCC = ON = SEL = -60V | 4 |
| GATE Drive (GATE, OUT) | ΔVGATE | 10 | 11.5 | 14 | V | SEL = SNS = OUT = VCC = 12V; 8V ≤ VCC ≤ 30V; IGATE = -1µA, 0µA | 4 |
| GATE Drive (GATE, OUT) | ΔVGATE | 5 |  | 8 | V | VCC = 4V; IGATE = -1µA, 0µA | 4 |
| GATE Clamp to VCC (GATE, VCC) | ΔVCLAMP | 12 | 13.5 | 14.5 | V | SNS = OUT = 20V, IGATE = 0µA | 4 |
| GATE Clamp to GND | VGATE | 30 | 31.5 | 33 | V | VCC = 30V, SEL = 0V (LTC4380-1/LTC4380-2) | 4 |
| GATE Clamp to GND | VGATE | 47.5 | 50 | 52.5 | V | VCC = 60V, SEL = VCC (LTC4380-1/LTC4380-2) | 4 |
| GATE Pull-Up Current | IGATE(UP) | -10 | -20 | -30 | µA | VCC = GATE = OUT = 12V, SEL = 0V | 4 |
| GATE Pull-Up Current | IGATE(UP) | -12 | -25 | -35 | µA | VCC = GATE = OUT = 24V, SEL = VCC | 4 |
| GATE Pull-Down Current, Overcurrent | IGATE(DN) | 50 |  | 100 | mA | ΔVSNS = 200mV, GATE = 12V, OUT = 0V | 4 |
| GATE Pull-Down Current, Shutdown | IGATE(DN) | 0.3 |  | 5 | mA | ON = 0V, GATE = 20V | 4 |
| GATE Pull-Down Current, Input UV | IGATE(DN) | 2 |  | 5 | mA | VCC = 3.5V, GATE = 10V | 4 |
| GATE Pull-Down Current, Fault Time Out | IGATE(DN) | 1.5 |  | 3.5 | mA | TMR = 2V, GATE = 10V | 4 |
| Current Limit Sense Voltage (SNS, OUT) | ΔVSNS | 45 | 50 | 55 | mV | VCC = 12V, 24V, OUT = 6V, 12V | 4 |
| Current Limit Sense Voltage (SNS, OUT) | ΔVSNS | 42 | 62 | 95 | mV | VCC = 12V, 24V, OUT = 0V | 4 |
| Overcurrent Turn-Off Propagation Delay | tOFF(OC) |  | 2 | 4 | µs | ΔVSNS steps from 0V to 250mV, OUT = 6V | 4 |
| SEL Input Current | ISEL | -0.1 |  | 0.1 | µA | SEL = 0V to 80V | 4 |
| SEL Input Threshold | VSEL | 0.4 |  | 3 | V |  | 4 |
| FLT Leakage Current | IFLT |  |  | 2 | µA | FLT = 80V | 4 |
| FLT Output Low | VFLT(LOW) |  | 0.1 | 0.5 | V | ISINK = 0.1mA | 4 |
| FLT Output Low | VFLT(LOW) |  | 1 | 4 | V | ISINK = 3mA | 4 |
| DRN Voltage (DRN, OUT) | ΔVDRN | 0.7 | 1.5 | 2.5 | V | IDRN = 0.1mA, OUT = SNS = 12V | 5 |
| Overvoltage VDS Threshold (DRN, OUT) | VDS(MAX) | 0.6 | 0.7 | 0.8 | V | TMR = 0.8V, IDRN = 2µA | 5 |
| Overvoltage VDS Threshold (DRN, OUT) | VDS(MAX) | 0.3 |  | 1 | V | SNS = OUT = 12V | 5 |
| TMR Pull-Down Current | ITMR(DN) | 1.25 | 2 | 2.75 | µA | TMR = 0.8V | 5 |
| TMR Pull-Up Current, Cool Down | ITMR(UP,COOL) | -1 | -2 | -3 | µA | TMR = 2V | 5 |
| TMR Pull-Up Current, Overvoltage | ITMR(UP) | -0.8 | -1.6 | -2.4 | µA | TMR = 0.8V, OUT = 11V, IDRN = 5µA, ΔVSNS = 0mV | 5 |
| TMR Pull-Up Current, Overvoltage | ITMR(UP) | -3.5 | -6.7 | -11.6 | µA | OUT = 28V, TMR = 0.8V, IDRN = 0.1mA, ΔVSNS = 10mV | 5 |
| TMR Pull-Up Current, Overvoltage | ITMR(UP) | -13 | -30 | -61 | µA | OUT = 28V, TMR = 0.8V, IDRN = 1mA, ΔVSNS = 10mV | 5 |
| TMR Pull-Up Current, Overvoltage | ITMR(UP) | -10 | -20 | -30 | µA | OUT = 28V, TMR = 0.8V, IDRN = 0.1mA, ΔVSNS = 40mV | 5 |
| TMR Pull-Up Current, Overvoltage | ITMR(UP) | -60 | -120 | -180 | µA | OUT = 28V, TMR = 0.8V, IDRN = 1mA, ΔVSNS = 40mV | 5 |
| TMR Pull-Up Current, Overcurrent |  | -4 | -6 | -9 | µA | TMR = 0.8V, IDRN = 0mA, OUT = 11V | 5 |
| TMR Pull-Up Current, Overcurrent |  | -17 | -27 | -34 | µA | TMR = 0.8V, IDRN = 0mA, OUT = 0V | 5 |
| TMR Pull-Up Current, Overcurrent |  | -16 | -27 | -38 | µA | TMR = 0.8V, IDRN = 0.1mA, OUT = 11V | 5 |
| TMR Pull-Up Current, Overcurrent |  | -80 | -142 | -200 | µA | TMR = 0.8V, IDRN = 1mA, OUT = 11V | 5 |
| TMR Pull-Up Current, Overcurrent |  | -35 | -50 | -60 | µA | TMR = 0.8V, IDRN = 0.1mA, OUT = 0V | 5 |
| TMR Pull-Up Current, Overcurrent |  | -130 | -170 | -220 | µA | TMR = 0.8V, IDRN = 1mA, OUT = 0V | 5 |
| TMR Gate Off Threshold | VTMR(F) | 1.178 | 1.215 | 1.251 | V | TMR Rising | 5 |
| Retry Duty Cycle; Overvoltage (LTC4380-2/LTC4380-4) | D |  | 2.8 | 3.5 | % | ΔVSNS = 40mV, IDRN = 5µA, OUT = 28V, VCC = 29V | 5 |
| Retry Duty Cycle; Overvoltage (LTC4380-2/LTC4380-4) | D |  | 0.1 | 0.2 | % | ΔVSNS = 40mV, IDRN = 500µA, OUT = 28V, VCC = 80V | 5 |
| Retry Duty Cycle; Overcurrent (LTC4380-2/LTC4380-4) | D |  | 0.1 | 0.2 | % | IDRN = 500µA, OUT = 0V, VCC = 14V | 5 |
| Retry Duty Cycle; Overcurrent (LTC4380-2/LTC4380-4) | D |  | 0.35 | 0.7 | % | IDRN = 500µA, OUT = 6V, VCC = 14V | 5 |
| ON Input Current | ION |  | -1 | -2 | µA | VON = 1V | 5 |
| ON Input Threshold (ON Rising) | VON | 0.99 | 1.05 | 1.1 | V | ON Rising | 5 |
| Turn-On Propagation Delay | tON(ON) |  | 5 | 25 | ms | ON steps from 0V to 1.5V, OUT = SNS = 0V | 5 |
| Turn-Off Propagation Delay | tOFF(ON) |  | 1 | 5 | µs | ON steps from 1.5V to 0V, OUT = SNS = VCC | 5 |
| Thermal resistance, junction to ambient (DD package) | θJA |  | 43 |  | °C/W | DD package (10-lead 3mm x 3mm DFN) | 2 |

## CAD (KiCad official)

- Symbol: `LTC4380IDD-2#TRPBF`
- Footprint: `Package_DFN_QFN:DFN-10-1EP_3x3mm_P0.5mm_EP1.55x2.48mm`
- 3D model: DFN-10-EP(3x3) (KiCad packages3D, STEP)
- 3D model files: `ltc4380idd-2-trpbf-etched.step` / `ltc4380idd-2-trpbf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ltc4380idd-2-trpbf.step` / `ltc4380idd-2-trpbf.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Analog Devices datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588917812161089536) (24 pp, sha256 `fd90f4073cbac9d3`, retrieved 2026-10-19, tier: lcsc)
- **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/ltc4380idd-2-trpbf-datasheet.pdf)