TPS7A91

@@ -0,0 +1,55 @@+# TPS7A91++**Texas Instruments** · LDO regulator · VSON-10++Low-noise linear regulator for supplying sensitive analog and RF rails, delivering 1 A with high power-supply rejection across frequency and low output noise. A programmable soft-start (SS_CTRL, NR/SS) tames inrush and sequences the rail, a power-good flag reports regulation, and the fast transient response holds the output steady under load steps. The output is set by an external divider at FB. A clean-up regulator for ADC, PLL, and oscillator supplies fed from a noisy source.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | OUT | power_out | Regulated output. Tie to pin 2 (both are OUT). A 10 µF or greater capacitor must be connected from this pin to GND for stability. Output range 0.8 V to 5.2 V, up to 1 A. |+| 2 | OUT | power_out | Regulated output (paralleled with pin 1). Requires a 10 µF or greater output capacitor to GND for loop stability. |+| 3 | FB | input | Feedback pin. Input to the control-loop error amplifier; regulated to VREF = 0.8 V. Used with an external resistor divider from OUT to GND to set VOUT (VOUT = 0.8 V × (1 + R1/R2)). |+| 4 | GND | power_in | Device ground. Connect to the device thermal pad and to the PCB ground plane. |+| 5 | PG | output | Open-drain power-good indicator for the LDO output. Requires a 10 kΩ to 100 kΩ external pull-up resistor. PG asserts low when VOUT falls below ~88.9% of nominal. May be left floating or tied to GND if unused. |+| 6 | SS_CTRL | input | Soft-start control pin. Tie to GND or IN to select the NR/SS capacitor charging current (typ 6.2 µA). If no CNR/SS capacitor is used, SS_CTRL must be tied to GND to avoid output overshoot. |+| 7 | EN | input | Enable input. LDO is enabled when VEN ≥ VIH(EN) (typ 1.1 V, max 6.5 V) and disabled when VEN ≤ VIL(EN) (max 0.4 V). Must be tied to IN if the enable function is not used; do not float. |+| 8 | NR/SS | passive | Noise-reduction / soft-start pin. Connect an external capacitor (0-10 µF) to bypass the internal band-gap reference; reduces output noise to low levels and, together with SS_CTRL, sets the output ramp rate to limit inrush current. |+| 9 | IN | power_in | Input supply pin (paralleled with pin 10). Input range 1.4 V to 6.5 V. A 10 µF or greater input capacitor is required close to the pin. |+| 10 | IN | power_in | Input supply pin (paralleled with pin 9). Input range 1.4 V to 6.5 V; 10 µF or greater bypass capacitor required. |+| 11 | Thermal Pad | passive | Exposed die-attach pad on the package bottom. Must be soldered to the PCB ground plane for proper thermal performance; electrically connect to GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Low-noise LDO |+| Output current | 1 A |+| Noise | Low (uVrms-class) |+| PSRR | High across frequency |+| Soft-start | Programmable (SS_CTRL, NR/SS) |+| Extras | Power-good flag |+| Output | Adjustable (FB) |+| Package | VSON-10 |++## Ordering variants++- `TPS7A9101DRBR (VSON-10)`+- `TPS7A9101DSKR (VSON-10, alt)`++## CAD (KiCad official)++- Symbol: `Regulator_Linear2:TPS7A91 (KiCad official)`+- Footprint: `Package_DFN_QFN:Texas_S-PDSO-N10_EP1.2x2mm`+- 3D model: VSON-10 (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/tps7a91.pdf) (34 pp, sha256 `c6f72e9e3a061a41`, 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/tps7a91-datasheet.pdf)

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