Synchronous boost (step-up) converter in a tiny SOT-563 package, built for single-cell battery and supercap rails. It starts from 0.5 V (1.8 V minimum to start) and boosts an adjustable 2.2 to 5.5 V output set by an external FB divider, with a 3.7 A valley switch-current limit. True input-to-output disconnect, 5.7 V output OVP, short-circuit and thermal protection round it out. The default way to make a stable 3.3 V or 5 V rail from a drooping battery.

Pinout

Pin	Name	Type	Function
1	FB	input	Voltage feedback pin for the adjustable output voltage. External R1/R2 divider from VOUT sets VOUT via the internal reference (V_REF = 595 mV typical in PWM mode). Very low leakage (~4 nA typical at 25 °C).
2	EN	input	Enable logic input. Logic high enables the device; logic low forces shutdown mode (~0.1 µA). V_EN_H = 1.2 V (max), V_EN_L = 0.35–0.45 V. Absolute max -0.3 V to 7 V.
3	VIN	power_in	IC power supply input. Recommended operating range 0.5 V to 5.5 V (1.8 V minimum required for start-up). Decouple locally with a ceramic capacitor (1.0 µF min, 4.7 µF typical).
4	GND	power_in	Ground pin of the IC. Return for input and output capacitors; connect directly to the system ground plane with a low-impedance path.
5	SW	power_out	Switch node of the boost converter. Connected to the drain of the internal low-side power MOSFET (47 mΩ) and the source of the internal high-side power MOSFET (68 mΩ). External inductor (0.37–2.9 µH; 1.0 µH typical) ties SW to VIN. Absolute max -0.3 V to 7 V (transient spikes to 9 V for 1 ns allowed).
6	VOUT	power_out	Boost converter output. Adjustable 2.2 V to 5.5 V set by external FB divider. Also supplies internal bias during light-load / super-cap backup operation (I_Q from VOUT ~20 µA typical). 5.7-V OVP; connect output capacitor (4 µF to 1000 µF effective, 10 µF typical).

Key specifications

Parameter	Value
Type	Synchronous boost (step-up) converter
Start-up voltage	0.5 V (1.8 V min to start)
Input voltage	0.5-5.5 V
Output voltage	2.2-5.5 V adjustable (FB divider)
Switch current limit	3.7 A (valley)
Protection	True I/O disconnect, 5.7 V OVP, short-circuit, thermal
Package	SOT-563
Body (L×W×H)	1.6 × 1.6 × 0.6 mm

Ordering variants

Same part, different packaging or reel option.

TPS61023DRLR (SOT-563, tape & reel)

CAD (KiCad official)

Symbol: TPS61023 (Adom-authored grouped symbol via adom-symbol; not in KiCad libs)
Footprint: Package_TO_SOT_SMD:SOT-563
3D model: SOT-563 (KiCad packages3D)

Provenance

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

Datasheet: Texas Instruments datasheet (28 pp, sha256 e3558c95c8420812, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude) — every pin and dimension is cited to a datasheet page; refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF