The SP6651A is a high efficiency 800mA synchronous buck regulator from Sipex Corporation, ideal for portable applications that use a Li-Ion or 3 cell alkaline/NiCD/NiMH input. The SP6651A features a proprietary control loop, 20µA light load quiescent current, and 0.3Ω power switches, providing excellent efficiency across a wide range of output currents. As the input battery supply decreases towards the output voltage the SP6651A seamlessly transitions into 100% duty ratio operation, further extending useful battery life. The SP6651A is protected against overload and short circuit conditions with a precise inductor peak current limit. Other features include programmable under voltage lockout and low battery detection, externally programmed output voltage down to 1.0V, logic level shutdown control, and 140°C over temperature shutdown.
The SP6651A is a high‑efficiency synchronous buck regulator that delivers up to 800 mA with an input range of 2.7 V to 5.5 V and an adjustable output down to 1.0 V. It features ultra‑low 20 µA quiescent current, 96 % peak efficiency, on‑chip over‑temperature shutdown, overload protection, programmable UVLO and a battery‑low indicator, all without external FETs.
Typical applications include PDAs, MP3 players, USB devices and other portable designs powered by Li‑ion batteries. The device is offered in a lead‑free 10‑pin DFN (8 mm × 3 mm) or MSOP package, with ordering options for tape‑and‑reel and various temperature grades.
| Maximum Output Current | 800 mA |
|---|---|
| Input Voltage Range | 2.7 V – 5.5 V |
| Adjustable Output Voltage | 1.0 V – Vout |
| Peak Efficiency | 96 % |
| Quiescent Current (light load) | 20 µA |
| Package | 10‑pin DFN (8 mm × 3 mm) |
The regulator can supply up to 800 mA of output current.
The device draws an ultra‑low 20 µA quiescent current at light load.
It includes over‑temperature shutdown, overload/short‑circuit protection, programmable UVLO, and a battery‑low indicator.
The part is offered in a lead‑free 10‑pin DFN package (8 mm × 3 mm) and a 10‑pin MSOP package.