TPS61091

@@ -0,0 +1,60 @@+# TPS61091++**Texas Instruments** · Switching regulator (boost) · VQFN-16++Boosts a 1.8 to 5.5 V input up to a regulated rail as high as 5.5 V, with a 2 A integrated switch and synchronous rectification for good efficiency from a two-cell or single Li-ion source. A built-in low-battery comparator (LBI/LBO) flags a sagging pack, a SYNC pin sets or synchronizes the switching, and a resistor divider at FB sets the output. Power-save mode keeps light-load efficiency high. A capable boost for handheld and battery-powered gear.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | VOUT | power_out | DC-DC boost converter output. Fixed 3.3 V on TPS61091; part of the 3-pin VOUT group (pins 1, 15, 16) - tie all three together at the output capacitor. |+| 2 | NC | unconnected | Not connected. Leave floating or tie to GND for mechanical stability; no internal bond. |+| 3 | SW | passive | Boost/rectifying switch node. Connect the external inductor between VBAT and SW (typ. 6.8 µH). Shared with pin 4 - bond both pins together for the 2-A switch current. |+| 4 | SW | passive | Boost/rectifying switch node (paired with pin 3). Peak switch current limited to 2500 mA. |+| 5 | PGND | power_in | Power ground return for the boost/rectifier switch. Tie pins 5, 6, 7 together to the PowerPAD and to the input/output capacitor grounds with a low-impedance plane. |+| 6 | PGND | power_in | Power ground (paired with pins 5 and 7). |+| 7 | PGND | power_in | Power ground (paired with pins 5 and 6). |+| 8 | VBAT | power_in | Battery / supply input, 1.8 V to 5.5 V. Bypass with ≥10 µF ceramic to PGND close to the pin. Also serves as the reference for the EN/SYNC logic high level (0.8 × VBAT). |+| 9 | LBI | input | Low-battery comparator input. Threshold 500 mV (typ) with 10 mV hysteresis; comparator is enabled with EN. Absolute-max input is 3.6 V - use an external divider to sense VBAT. |+| 10 | SYNC | input | Power-save mode select / external sync clock. 1 (≥0.8 × VBAT) = power-save disabled or apply a 500-700 kHz clock for synchronization; 0 (≤0.2 × VBAT) = power-save enabled. |+| 11 | EN | input | Device enable. 1 (VBAT) enables the converter and LBI/LBO comparator; 0 (GND) shuts the device down (load-disconnect from VBAT to VOUT). |+| 12 | LBO | output | Low-battery comparator output, open-drain. Requires external pull-up (to VOUT or system rail). VOL ≈ 40 mV at 100 µA; max leakage 0.1 µA at 7 V. |+| 13 | GND | power_in | Control/logic (analog) ground. Kelvin-connect to the PowerPAD ground plane away from the switching PGND current path. |+| 14 | FB | input | Voltage feedback for the adjustable version (TPS61090). On the fixed-output TPS61091 (3.3 V), feedback is internal - tie FB to VOUT via a direct connection per the datasheet's fixed-output usage. |+| 15 | VOUT | power_out | DC-DC output (paired with pins 1 and 16). Total output capacitance 22-100 µF recommended. |+| 16 | VOUT | power_out | DC-DC output (paired with pins 1 and 15). |+| 17 | PowerPAD | power_in | Exposed thermal pad on the package underside. Must be soldered to the PCB for rated power dissipation; connect to PGND plane. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Synchronous boost converter |+| Input | 1.8-5.5 V |+| Output | Up to 5.5 V (adjustable) |+| Switch current | 2 A |+| Extras | Low-battery detector (LBI/LBO), SYNC |+| Light load | Power-save mode |+| Package | VQFN-16 |++## Ordering variants++- `TPS61091RSAR (VQFN-16)`+- `TPS61091RSAT (VQFN-16, small reel)`++## CAD (KiCad official)++- Symbol: `Regulator_Switching:TPS61091 (KiCad official)`+- Footprint: `Package_DFN_QFN:Texas_RSA_VQFN-16-1EP_4x4mm_P0.65mm_EP2.7x2.7mm_ThermalVias`+- 3D model: VQFN-16 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/tps61091.pdf) (30 pp, sha256 `6378e47289a28cc3`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/tps61091-datasheet.pdf)

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