# LT1937ES5#TRPBF

**Analog Devices** · DC-DC Converters · TSOT-23-5

LT1937ES5#TRPBF from Analog Devices, in a TSOT-23-5. 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 | SW | passive | Switch pin connecting the inductor and diode; minimize trace area at this pin to reduce EMI, and the switch is rated to 36V. |
| 2 | GND | power_in | Ground pin, connect directly to the local ground plane. |
| 3 | FB | input | Feedback pin with 95mV reference voltage; connect the cathode of the lowest LED and the resistor here, with RFB = 95mV/ILED. |
| 4 | SHDN | input | Shutdown pin; connect to 1.5V or higher to enable the device and 0.4V or less to disable it. |
| 5 | VIN | power_in | Input supply pin that must be locally bypassed; operating range 2.5V minimum to 10V maximum. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | TSOT-23-5 |
| Category | Power Management ICs |
| Pins | 5 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Feedback Voltage | VFB | 86 | 95 | 104 | mV | ISW = 100mA, Duty Cycle = 66% | 2 |
| FB Pin Bias Current |  |  | 45 | 100 | nA |  | 2 |
| Supply Current |  |  | 1.9 | 2.5 | mA |  | 2 |
| Supply Current in Shutdown |  |  | 0.1 | 1 | µA | SHDN = 0V | 2 |
| Switching Frequency |  | 0.8 | 1.2 | 1.6 | MHz |  | 2 |
| Maximum Duty Cycle |  | 85 | 90 |  | % |  | 2 |
| Switch Leakage Current |  |  | 0.01 | 5 | µA | VSW = 5V | 2 |
| Minimum Operating Voltage |  |  |  | 2.5 | V |  | 2 |
| Maximum Operating Voltage |  | 10 |  |  | V |  | 2 |
| SHDN Voltage High |  | 1.5 |  |  | V |  | 2 |
| SHDN Voltage Low |  |  |  | 0.4 | V |  | 2 |
| Switch Current Limit |  |  | 320 |  | mA |  | 2 |
| Switch VCESAT |  |  | 350 |  | mV | ISW = 250mA | 2 |
| SHDN Pin Bias Current |  |  | 65 |  | µA |  | 2 |
| Input Voltage | VIN |  |  | 10 | V |  | 2 |
| SW Voltage |  |  |  | 36 | V |  | 2 |
| FB Voltage |  |  |  | 10 | V |  | 2 |
| SHDN Voltage |  |  |  | 10 | V |  | 2 |
| Maximum Junction Temperature | TJMAX |  |  | 125 | °C |  | 2 |
| Operating Temperature Range |  | -40 |  | 85 | °C | Extended Commercial (Note 2) | 2 |
| Storage Temperature Range |  | -65 |  | 150 | °C |  | 2 |
| Lead Temperature |  |  |  | 300 | °C | Soldering, 10 sec | 2 |
| Thermal Resistance Junction-to-Ambient | θJA |  | 256 |  | °C/W | in free air, S5 package | 2 |
| Thermal Resistance Junction-to-Ambient | θJA |  | 120 |  | °C/W | on board over ground plane, S5 package | 2 |

## CAD (KiCad official)

- Symbol: `LT1937ES5#TRPBF`
- Footprint: `Package_TO_SOT_SMD:TSOT-23-5`
- 3D model: TSOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `lt1937es5-trpbf-etched.step` / `lt1937es5-trpbf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lt1937es5-trpbf.step` / `lt1937es5-trpbf.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/1937f.pdf) (12 pp, sha256 `1855e3a3fafc0754`, retrieved 2026-10-31, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/lt1937es5-trpbf-datasheet.pdf)