# LTC3440EMS#PBF

**Analog Devices** · DC-DC Converters · MSOP-10

LTC3440EMS#PBF 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 | RT | input | Timing resistor pin that programs the oscillator frequency over a range of 300kHz to 2MHz. |
| 2 | MODE/SYNC | input | Driving it high enables Burst Mode operation, while a low level or an external clock selects fixed-frequency switching, with the clock at twice the desired switching frequency and a pulse width between 100ns and 2µs. |
| 3 | SW1 | passive | Switch pin where internal switches A and B connect; the inductor connects from SW1 to SW2 and the trace should be kept short to reduce EMI. |
| 4 | SW2 | passive | Switch pin where internal switches C and D connect; a Schottky diode from SW2 to VOUT is required for output voltages above 4.3V. |
| 5 | GND | power_in | Signal and power ground for the IC, to which the VIN bypass capacitor must be returned close to the pin. |
| 6 | VOUT | power_out | Output of the synchronous rectifier, with a filter capacitor from VOUT to GND; the output is adjustable from 2.5V to 5.5V. |
| 7 | VIN | power_in | Input supply pin and internal VCC for the IC, with an input operating range of 2.5V to 5.5V and a ceramic bypass capacitor required close to VIN and GND. |
| 8 | SHDN/SS | input | Combined soft-start and shutdown pin: grounding it shuts down the IC, above 1.5V enables the IC, and above 2.5V keeps the error amp from being clamped during soft-start. |
| 9 | FB | input | Feedback pin connected to the resistor divider tap, with a feedback reference typically 1.22V (1.196V to 1.244V). |
| 10 | VC | passive | Error amplifier output, with a frequency compensation network connected from this pin to FB. |

## 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 |
|---|---|---|---|---|---|---|---|
| Input Start-Up Voltage |  |  | 2.4 | 2.5 | V |  | 2 |
| Input Operating Range |  | 2.5 |  | 5.5 | V |  | 2 |
| Output Voltage Adjust Range |  | 2.5 |  | 5.5 | V |  | 2 |
| Feedback Voltage |  | 1.196 | 1.22 | 1.244 | V |  | 2 |
| Feedback Input Current | VFB |  | 1 | 50 | nA | VFB = 1.22V | 2 |
| Quiescent Current, Burst Mode Operation |  |  | 25 | 40 | µA | VC = 0V, MODE/SYNC = 3V (Note 3) | 2 |
| Quiescent Current, Shutdown |  |  | 0.1 | 1 | µA | SHDN = 0V, Not Including Switch Leakage | 2 |
| Quiescent Current, Active |  |  | 600 | 1000 | µA | VC = 0V, MODE/SYNC = 0V (Note 3) | 2 |
| NMOS Switch Leakage |  |  | 0.1 | 5 | µA | Switches B and C | 2 |
| PMOS Switch Leakage |  |  | 0.1 | 10 | µA | Switches A and D | 3 |
| Maximum Duty Cycle Boost |  | 55 |  | 75 | % | % Switch C On | 3 |
| Maximum Duty Cycle Buck |  |  | 100 |  | % | % Switch A On | 3 |
| Minimum Duty Cycle |  |  | 0 |  | % |  | 3 |
| Frequency Accuracy |  | 0.8 | 1 | 1.2 | MHz |  | 3 |
| MODE/SYNC Threshold |  | 0.4 |  | 2 | V |  | 3 |
| MODE/SYNC Input Current | VMODE/SYNC |  | 0.01 | 1 | µA | VMODE/SYNC = 5.5V | 3 |
| SHDN/SS Threshold, When IC is Enabled |  | 0.4 | 1 | 1.5 | V | When IC is Enabled | 3 |
| SHDN/SS Threshold, When EA is at Maximum Boost Duty Cycle |  | 2.2 |  |  | V | When EA is at Maximum Boost Duty Cycle | 3 |
| SHDN/SS Input Current | VSHDN |  | 0.01 | 1 | µA | VSHDN = 5.5V | 3 |
| NMOS Switch On Resistance |  |  | 0.19 |  | Ω | Switches B and C | 3 |
| PMOS Switch On Resistance |  |  | 0.22 |  | Ω | Switches A and D | 3 |
| Input Current Limit |  |  | 1 |  | A |  | 3 |
| Error Amp AVOL |  |  | 90 |  | dB |  | 3 |
| Error Amp Source Current |  |  | 15 |  | µA |  | 3 |
| Error Amp Sink Current |  |  | 380 |  | µA |  | 3 |
| VIN, VOUT Voltage | VIN, VOUT | -0.3 |  | 6 | V |  | 2 |
| SW1, SW2 Voltage | SW1, SW2 | -0.3 |  | 6 | V |  | 2 |
| VC, RT, FB, SHDN/SS, MODE/SYNC Voltage | VC, RT, FB, SHDN/SS, MODE/SYNC | -0.3 |  | 6 | V |  | 2 |
| Operating Temperature Range |  | -40 |  | 85 | °C |  | 2 |
| Storage Temperature Range |  | -65 |  | 125 | °C |  | 2 |
| Lead Temperature (Soldering) |  |  |  | 300 | °C | Soldering, 10 sec | 2 |
| Maximum Junction Temperature | TJMAX |  |  | 125 | °C |  | 2 |
| Thermal Resistance, Junction to Ambient (MS package) | θJA |  | 130 |  | °C/W | 1 layer board | 2 |
| Thermal Resistance, Junction to Ambient (MS package) | θJA |  | 100 |  | °C/W | 4 layer board | 2 |
| Thermal Resistance, Junction to Case (MS package) | θJC |  | 45 |  | °C/W |  | 2 |

## CAD (KiCad official)

- Symbol: `LTC3440EMS#PBF`
- Footprint: `Package_SO:MSOP-10_3x3mm_P0.5mm`
- 3D model: MSOP-10 (KiCad packages3D, STEP)
- 3D model files: `ltc3440ems-pbf-etched.step` / `ltc3440ems-pbf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ltc3440ems-pbf.step` / `ltc3440ems-pbf.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Analog Devices datasheet](https://www.analog.com/media/en/technical-documentation/data-sheets/3440fd.pdf) (22 pp, sha256 `284b323962287c76`, retrieved 2026-10-29, tier: manufacturer)
- **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/ltc3440ems-pbf-datasheet.pdf)