Products
Inductorless, switching-free DC regulation in buck and boost topologies. Pick by current, noise floor, or radiation rating — every part ships on an evaluation board, with datasheets and SPICE models on request.
Four series, one architecture
Each family pairs a proven LDO core with Polaris PV-output optocouplers: pick the core that matches your constraint, keep the same switching-free architecture.
Every orderable part, one table
All specifications from the published product table and series pages. Parts are under development; specifications are subject to change. Unknowns are marked TBD — never estimated.
| Part | Topology | VOUT (V) | Max VIN (V) | Min VIN (enhanced) | Max IOUT (mA) | PSRR @ 1 kHz (dB) | RMS noise (µV) | TID krad(Si) | Package | LDO core | Docs |
|---|---|---|---|---|---|---|---|---|---|---|---|
| BK191D18V | Buck | 1.2 – 2 | 20 | VOUT + 1.4 (L) VOUT + 2.8 (M) | 900 | 75 | 12 | 200 | QFN-28 · 6 mm | RH1965 | Spotlight |
| BK291D18V | Buck | 1.2 – 2 | 26 | VOUT + 1.4 (L) VOUT + 2.8 (M) | 1000 | 65 | 160 | 200 | QFN-28 · 6 mm | MIC29152 | Spotlight |
| BK291D33L | Buck | 1.2 – 4 | 26 | VOUT + 1.4 | 1000 | 65 | 245 | 200 | QFN-32 · 7 mm | MIC29152 | Spotlight |
| BK291D33V | Buck | 1.2 – 4 | 26 | VOUT + 2.8 (M) VOUT + 5.5 (H) | 1000 | 65 | 245 | 200 | QFN-32 · 7 mm | MIC29152 | Spotlight |
| BK291D50E | Buck | 1.2 – 5 | 26 | VOUT + 7.0 | 1000 | 65 | 350 | 200 | QFN-32 · 7 mm | MIC29152 | Spotlight |
| BK301D18V | Buck | 0 – 2 | 15 | VOUT + 1.4 (L) VOUT + 2.8 (M) | 500 | >100 | <1 | 200 | QFN-28 · 6 mm | LT3045 | Spotlight |
| BK301D33L | Buck | 0 – 4 | 15 | VOUT + 1.4 | 500 | >100 | <1 | 200 | QFN-32 · 7 mm | LT3045 | Spotlight |
| BK301D33V | Buck | 0 – 4 | 15 | VOUT + 2.8 (M) VOUT + 5.5 (H) | 500 | >100 | <1 | 200 | QFN-32 · 7 mm | LT3045 | Spotlight |
| BK301D50H | Buck | 0 – 6 | 15 | VOUT + 4.1 | 500 | >100 | <1 | 200 | QFN-32 · 7 mm | LT3045 | Spotlight |
| BK300D50E | Buck | 0 – 5 | 15 | VOUT + 7.0 | 500 | >100 | <1 | 200 | QFN-32 · 7 mm | LT3045 | Spotlight |
| BT291D18M | Boost | up to 5 | 5 | 3.1 | 500 | 60 | TBD | 200 | QFN-28 · 6 mm | MIC29152 | Spotlight |
- All parts listed here are under development and device specifications are subject to change.
- Minimum input voltage applies in optocoupler-enhanced mode at Iout = 0.1 A. Every device can also operate as a conventional low-dropout linear regulator with lower VIN.
- RMS output noise is specified over 10 Hz – 100 kHz.
- Part numbers ending in “V” select between two input-voltage ranges via board-level pin connections.
- TID ratings denote device-level radiation tolerance. The BK19’s RH1965 LDO core additionally carries QML-V radiation hardness assurance (200 krad(Si) at a 50 rad/s dose rate).
- Additional boost configurations — BT291D50M (the “Tiny Boost” of PSAN001, also featured in PSAN002) and BT291D50H (adjustable output up to 5 V) — are documented in the application notes and BT29 spotlight and are available for sampling; contact us for specifications.
Reading a Polaris part number
Output-voltage code (buck): 18 ⇒ outputs up to 2 V · 33 ⇒ up to 4 V · 50 ⇒ up to 5 V (up to 6 V on BK301D50H). Outputs are adjustable: BK19 and BK29 devices down to 1.2 V, BK30 devices down to 0 V — see the selection table for each part's exact range.
Input-voltage range: L lowest · M medium · H high · E extended — IDs ending in V select between two ranges via board-level pin connections. Every device also runs as a conventional LDO by shorting two pins ("LDO mode").
Boost (BT) parts share the same grammar but regulate up to 5 V — see the BT29 series page for output behavior.
Every part, on a board
All products are available on evaluation boards, ready to drop into your test setup. Request one with your samples.
Datasheets & SPICE models
Full datasheets and SPICE models are available on request — ask with your sample request or talk to an engineer.
Don't see your spec?
We also offer custom configurations — different LDO cores, output ranges, and input windows. Tell us what you need.
Ready to design it in?
Request evaluation samples, detailed datasheets, and SPICE models — an engineer answers, not a sales funnel.