# FP5139BWR-LF

**Advanced Analog Technology** · DC-DC Converters · TSSOP-8

FP5139BWR-LF from Advanced Analog Technology, in a TSSOP-8. 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 | FB | input | Error amplifier inverting input, compared against the 0.5 V internal reference to regulate the DC-DC output voltage. |
| 2 | SCP | input | Soft-start and short-circuit protection timing pin; a capacitor here sets the soft-start time (Tss ms = 0.35 × C µF) and the short-circuit protection time (Tscp ms = 0.8 × C µF). |
| 3 | VCC | power_in | IC power supply, rated 1.8 V to 15 V, with 15 V as the absolute maximum power supply voltage. |
| 4 | BR / CTL | input | Sets the output drive current through an external resistor RB (390 Ω in the test conditions) and controls the output: low or open disables the output (standby), high enables operation. |
| 5 | OUT | output | Totem-pole output for driving an external NPN transistor or N-MOS, with absolute maximum output source current of -50 mA and sink current of 50 mA. |
| 6 | GND | power_in | IC ground reference. |
| 7 | OSC | input | Oscillator pin; connect a resistor and capacitor from this pin to ground to set the switching frequency from 20 kHz to 1 MHz, with a sawtooth swing of about 0.1 V to 0.6 V. |
| 8 | COMP | output | Error amplifier compensation output, whose positive swing is about 0.87 V typical and negative swing about 0.2 V maximum. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Advanced Analog Technology |
| Package | TSSOP-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply Voltage |  | 1.8 |  | 15 | V |  | 5 |
| Operating Temperature |  | -10 |  | 85 | ℃ |  | 5 |
| Power Supply Voltage | VIN |  |  | 15 | V |  | 4 |
| Output Source Current |  | -50 |  |  | mA |  | 4 |
| Output Sink Current |  |  |  | 50 | mA |  | 4 |
| Allowable Power Dissipation (TSSOP-8L) |  |  |  | 400 | mW | TA≦+25℃ | 4 |
| Storage Temperature |  | -55 |  | 125 | ℃ |  | 4 |
| Lead Temperature (TSSOP-8L) |  |  |  | 260 | ℃ | soldering, 10 sec | 4 |
| Upper Threshold Voltage (UVLO) | VUPPER | 1.1 | 1.3 | 1.5 | V |  | 5 |
| Input Source Current (SS) | ISS | -1.5 | -1 | -0.7 | µA | VSCP= 0V | 5 |
| Soft Start Threshold Voltage | VSST | 0.8 | 0.9 | 1 | V |  | 5 |
| Input Source Current (SCP) | ISCP | -1.5 | -1 | -0.7 | μA | VSCP= 0V | 5 |
| SCP Threshold Voltage | VSCP | 0.7 | 0.8 | 0.9 | V |  | 5 |
| Oscillation Frequency | f | 400 | 500 | 600 | KHz | RT =3.0KΩ, CT =270pF | 5 |
| Input Threshold Voltage | VFB | 490 | 500 | 510 | mV | VCOMP =450mV | 5 |
| Input Bias Current | IB | -1 | -0.2 | 1 | μA |  | 5 |
| Output Voltage Swing Positive | VPOS | 0.78 |  | 0.87 | V |  | 5 |
| Output Voltage Swing Negative | VNEG | 0.05 |  | 0.2 | V |  | 5 |
| Output Source Current (error amp) | ISOURCE | -40 |  | -24 | µA | VCOMP =450 mV | 5 |
| Output Sink Current (error amp) | ISINK | 24 |  | 40 | µA | VCOMP =450 mV | 5 |
| Frequency Change With Voltage | Δf / ΔV | 2 |  | 10 | % | VCC =2V to 15V | 5 |
| Average Current Consumption | IAVE | 5 |  | 10 | mA | RB =390Ω, VCC =0~15V | 5 |
| VT Change With Voltage | ΔVFB / ΔV | 5 |  | 20 | mV | VCC =2V to 15V | 5 |
| Output High Voltage (VOH1) | VOH1 | 1 |  | 1.2 | V | RB=390Ω, IO=-15mA | 6 |
| Output High Voltage (VOH2) | VOH2 | 0.8 |  | 1 | V | RB=750Ω, IO=-10mA, VCC= 1.8V | 6 |
| Output Saturation Voltage (VOL1) | VOL1 | 0.1 |  | 0.2 | V | RB=390Ω, IO=15mA | 6 |
| Output Saturation Voltage (VOL2) | VOL2 | 0.1 |  | 0.2 | V | RB=750Ω, IO=10mA, VCC= 1.8V | 6 |
| Output Source Current (driver) | IOSOURCE | -40 | -20 |  | mA | RB=390Ω, Vo=0.9V | 6 |
| Output Sink Current (driver) | IOSINK | 30 | 40 |  | mA | RB=390Ω, Vo=0.3V | 6 |
| Internal Pull-Down Resistor | RO | 20 | 30 | 40 | kΩ |  | 6 |
| Pin Voltage | VBR | 0.15 | 0.22 | 0.3 | V | RB=390Ω | 6 |
| Input Off Condition | IOFF | -20 |  | 0 | μA |  | 6 |
| Pin Current Range | IBR | -1.8 |  | -0.1 | mA |  | 6 |

## CAD (KiCad official)

- Symbol: `FP5139BWR-LF`
- Footprint: `Package_SO:TSSOP-8_3x3mm_P0.65mm`
- 3D model: TSSOP-8 (KiCad packages3D, STEP)
- 3D model files: `fp5139bwr-lf-etched.step` / `fp5139bwr-lf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fp5139bwr-lf.step` / `fp5139bwr-lf.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Advanced Analog Technology datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588881528244088832) (15 pp, sha256 `552252733a101e9a`, retrieved 2026-10-09, 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/fp5139bwr-lf-datasheet.pdf)